We Keep Coding

Httpcontext.current.session becoming null

Httpcontext.current.session becoming null in local code, session not expired still in active and I didn't clear session manually when click on button controller will receive post request and after authenticating user setting user details in httpcontext.current.session, after setting if I send another post request all values are becoming null
internal class AspDotNet : Base
{
internal AspDotNet(String key)
: base(key)
{
}
internal override void Set(Object value)
{
this.Value = value;
HttpContext.Current.Session[base.Key] = value;
}
internal override Object Get()
{
this.Value = HttpContext.Current.Session[base.Key];
return this.Value;
}
internal override void Remove()
{
HttpContext.Current.Session.Remove(base.Key);
}
}
}

can you try like this. I believe static class will work for you.
public static class SessionPersiter
{
public static int? UserID
{
get
{
if (HttpContext.Current == null)
return (Int32?)null;
var sessionData = HttpContext.Current.Session[CommonConstants.UserIDSessionKey];
if (sessionData == null)
return (Int32?)null;
return (int)sessionData;
}
set
{
HttpContext.Current.Session[CommonConstants.UserIDSessionKey] = value;
}
}
public static UserDTO AuthenticatedUser
{
get
{
if (HttpContext.Current == null)
return null;
var sessionData = HttpContext.Current.Session[CommonConstants.AuthenticatedUserKey];
if (sessionData == null)
return null;
return (UserDTO)sessionData;
}
set
{
HttpContext.Current.Session[CommonConstants.AuthenticatedUserKey] = value;
}
}
public static long? LastLoginID
{
get
{
if (HttpContext.Current == null)
return (long?)null;
var sessionData = HttpContext.Current.Session[CommonConstants.LastLoginIDSessionKey];
if (sessionData == null)
return (long?)null;
return (long)sessionData;
}
set
{
HttpContext.Current.Session[CommonConstants.LastLoginIDSessionKey] = value;
}
}
}
and call like this
var userToken = SessionPersiter.AuthenticatedUser.Token;

How to pass correctly parameters with navigation service from a viewmodel to another?

i'm trying to pass parameters from a viewmodel to another, how is described here:
https://mallibone.com/post/xamarin.forms-navigation-with-mvvm-light.
The problem is that when i call my NavigateAsync(string pageKey, object parameter, bool animated = true) , it's thrown a InvalidOperationException and the message setted in the navigation service is: No suitable constructor found for page.
My actual code is the following:
The page I want to navigate to:
public partial class FullScreenImagePopupPage : PopupPage
{
public FullScreenImagePopupPage(ImageSource imageSource)
{
var vm = App.Locator.FullScreenImageVM;
BindingContext = vm;
InitializeComponent();
if (imageSource != null)
vm.ImageSourceFullscreen = imageSource;
}
}
it's viewmodel:
public class FullScreenImageViewModel : BaseViewModel
{
private ImageSource _ImageSourceFullscreen { get; set; }
public ImageSource ImageSourceFullscreen
{
get { return _ImageSourceFullscreen; }
set
{
_ImageSourceFullscreen = value;
OnPropertyChanged();
}
}
public FullScreenImageViewModel(INavigationService navigationService) : base(navigationService)
{
}
}
The command called everytime i want to navigate to FullScreenImagePopupPage:
OpenFullImageCommand = new Command(async () =>await navigationService.NavigateAsync(Locator.FullScreenImagePopupPage, ImageSourceFullScreen));
The NavigateAsync function's implementation:
public async Task NavigateAsync(string pageKey, object parameter, bool animated = true)
{
var page = GetPage(pageKey, parameter);
if (page is PopupPage)
await CurrentNavigationPage.Navigation.PushPopupAsync(page as PopupPage, true);
else
{
await CurrentNavigationPage.Navigation.PushAsync(page, animated);
}
}
public Page GetPage(string pageKey, object parameter = null)
{
lock (_sync)
{
if (!_pagesByKey.ContainsKey(pageKey))
{
throw new ArgumentException(
$"No such page: {pageKey}. Did you forget to call NavigationService.Configure?");
}
var type = _pagesByKey[pageKey];
ConstructorInfo constructor;
object[] parameters;
if (parameter == null)
{
constructor = type.GetTypeInfo()
.DeclaredConstructors
.FirstOrDefault(c => !c.GetParameters().Any());
parameters = new object[]
{
};
}
else
{
var a = type.GetTypeInfo()
.DeclaredConstructors;
constructor = type.GetTypeInfo()
.DeclaredConstructors
.FirstOrDefault(
c =>
{
var p = c.GetParameters();
return p.Length == 1
&& p[0].ParameterType == parameter.GetType();
});
parameters = new[]
{
parameter
};
}
if (constructor == null)
{
throw new InvalidOperationException(
"No suitable constructor found for page " + pageKey);
}
var page = constructor.Invoke(parameters) as Page;
return page;
}
}

Asp.Net MVC 3.0 Model Localization With RegularExpression Attribute

I've written a custom error message localization logic in my custom DataAnnotationsModelMetadataProvider class. It's working just fine with build-in StringLengthAttribute or RequiredAttribute validation error messages. But i am having trouble with my custom derived RegularExpressionAttribute classes. The logic i am using is something like below :
public class AccountNameFormatAttribute : RegularExpressionAttribute {
public AccountNameFormatAttribute()
: base(Linnet.Core.Shared.RegExPatterns.AccountNamePattern) {
}
public override string FormatErrorMessage(string name) {
return string.Format("{0} field must contain only letters, numbers or | . | - | _ | characters.", name);
}
}
public class SignUpViewModel {
[AccountNameFormat()]
[StringLength(16, MinimumLength = 3)]
[Required]
[DisplayName("Account Name")]
public string AccountName { get; set; }
[Required]
[DisplayName("Password")]
[StringLength(32, MinimumLength = 6)]
[DataType(System.ComponentModel.DataAnnotations.DataType.Password)]
public string Password { get; set; }
// .... and other properties, quite similar ... //
}
public class MvcDataAnnotationsModelValidatorProvider : DataAnnotationsModelValidatorProvider {
protected override IEnumerable<ModelValidator> GetValidators(ModelMetadata metadata, ControllerContext context, IEnumerable<Attribute> attributes) {
MyMvcController myMvcController = context.Controller as MyMvcController; /* custom mvc controller, that contains methods for wcf service activations and common properties. */
if (myMvcController == null) {
return base.GetValidators(metadata, context, attributes);
}
List<Attribute> newAttributes = new List<Attribute>();
foreach (Attribute att in attributes) {
if (att.GetType() != typeof(ValidationAttribute) && !att.GetType().IsSubclassOf(typeof(ValidationAttribute))) {
// if this is not a validation attribute, do nothing.
newAttributes.Add(att);
continue;
}
ValidationAttribute validationAtt = att as ValidationAttribute;
if (!string.IsNullOrWhiteSpace(validationAtt.ErrorMessageResourceName) && validationAtt.ErrorMessageResourceType != null) {
// if resource key and resource type is already set, do nothing.
newAttributes.Add(validationAtt);
continue;
}
string translationKey = "MvcModelMetaData.ValidationMessages." + metadata.ModelType.Name + (metadata.PropertyName != null ? "." + metadata.PropertyName : string.Empty) + "." + validationAtt.GetType().Name;
string originalText = validationAtt.FormatErrorMessage("{0}"); /* non-translated default english text */
// clonning current attiribute into a new attribute
// not to ruin original attribute for later usage
// using Activator.CreateInstance and then mapping with AutoMapper inside..
var newAtt = this.CloneValidationAttiribute(validationAtt);
// fetching translation from database via WCF service...
// At this point, i can see error strings are always translated.
// And it works perfect with [Required], [StringLength] and [DataType] attributes.
// But somehow it does not work with my AccountNameFormatAttribute on the web page, even if i give it the translated text as expected..
// Even if its ErrorMessage is already set to translated text,
// it still displays the original english text from the overridden FormatErrorMessage() method on the web page.
// It is the same both with client side validation or server side validation.
// Seems like it does not care the ErrorMessage that i manually set.
newAtt.ErrorMessage = myMvcController.Translations.GetTranslation(translationKey, originalText);
newAttributes.Add(newAtt);
}
IEnumerable<ModelValidator> result = base.GetValidators(metadata, context, newAttributes);
return result;
}
private ValidationAttribute CloneValidationAttiribute(ValidationAttribute att) {
if (att == null) {
return null;
}
Type attType = att.GetType();
ConstructorInfo[] constructorInfos = attType.GetConstructors();
if (constructorInfos == null || constructorInfos.Length <= 0) {
// can not close..
return att;
}
if (constructorInfos.Any(ci => ci.GetParameters().Length <= 0)) {
// clone with no constructor paramters.
return CloneManager.CloneObject(att) as ValidationAttribute;
}
// Validation attributes that needs constructor paramters...
if (attType == typeof(StringLengthAttribute)) {
int maxLength = ((StringLengthAttribute)att).MaximumLength;
return CloneManager.CloneObject(att, maxLength) as StringLengthAttribute;
}
return att;
}
}
public class CloneManager {
public static object CloneObject(object input) {
return CloneObject(input, null);
}
public static object CloneObject(object input, params object[] constructorParameters) {
if (input == null) {
return null;
}
Type type = input.GetType();
if (type.IsValueType) {
return input;
}
ConstructorInfo[] constructorInfos = type.GetConstructors();
if (constructorInfos == null || constructorInfos.Length <= 0) {
throw new LinnetException("0b59079b-3dc4-4763-b26d-651bde93ba56", "Object type does not have any constructors.", false);
}
if ((constructorParameters == null || constructorParameters.Length <= 0) && !constructorInfos.Any(ci => ci.GetParameters().Length <= 0)) {
throw new LinnetException("f03be2b9-b629-4a72-b025-c7a87924d9a4", "Object type does not have any constructor without parameters.", false);
}
object newObject = null;
if (constructorParameters == null || constructorParameters.Length <= 0) {
newObject = Activator.CreateInstance(type);
} else {
newObject = Activator.CreateInstance(type, constructorParameters);
}
return MapProperties(input, newObject);
}
private static object MapProperties(object source, object destination) {
if (source == null) {
return null;
}
Type type = source.GetType();
if (type != destination.GetType()) {
throw new LinnetException("e67bccfb-235f-42fc-b6b9-55f454c705a8", "Use 'MapProperties' method only for object with same types.", false);
}
if (type.IsValueType) {
return source;
}
var typeMap = AutoMapper.Mapper.FindTypeMapFor(type, type);
if (typeMap == null) {
AutoMapper.Mapper.CreateMap(type, type);
}
AutoMapper.Mapper.Map(source, destination, type, type);
return destination;
}
}

Seems like my logic was actually an odd approach.
I've discovered making custom DataAnnotationsModelValidators for each type of validation attiributes. And then translating the ErrorMessages inside Validate() and GetClientValidationRules() methods.
public class MvcRegularExpressionAttributeAdapter : RegularExpressionAttributeAdapter {
public MvcRegularExpressionAttributeAdapter(ModelMetadata metadata, ControllerContext context, RegularExpressionAttribute attribute)
: base(metadata, context, attribute) {
}
public override IEnumerable<ModelClientValidationRule> GetClientValidationRules() {
return MvcValidationResultsTranslation.TranslateClientValidationRules(base.GetClientValidationRules(), this.Metadata, this.ControllerContext, this.Attribute);
}
public override IEnumerable<ModelValidationResult> Validate(object container) {
return MvcValidationResultsTranslation.TranslateValidationResults(base.Validate(container), this.Metadata, this.ControllerContext, this.Attribute);
}
}
public class MvcValidationResultsTranslation {
public static IEnumerable<ModelClientValidationRule> TranslateClientValidationRules(IEnumerable<ModelClientValidationRule> validationRules, ModelMetadata metadata, ControllerContext context, ValidationAttribute validationAttribute) {
if (validationRules == null) {
return validationRules;
}
MvcController mvcController = context.Controller as MvcController;
if (mvcController == null) {
return validationRules;
}
if (!string.IsNullOrWhiteSpace(validationAttribute.ErrorMessageResourceName) && validationAttribute.ErrorMessageResourceType != null) {
// if resource key and resource type is set, do not override..
return validationRules;
}
string translatedText = GetTranslation(metadata, mvcController, validationAttribute);
foreach (var validationRule in validationRules) {
List<string> msgParams = new List<string>();
msgParams.Add(!string.IsNullOrEmpty(metadata.DisplayName) ? metadata.DisplayName : metadata.PropertyName);
if (validationRule.ValidationParameters != null) {
msgParams.AddRange(validationRule.ValidationParameters.Where(p => p.Value.GetType().IsValueType || p.Value.GetType().IsEnum).Select(p => p.Value.ToString()));
}
validationRule.ErrorMessage = string.Format(translatedText, msgParams.ToArray());
}
return validationRules;
}
public static IEnumerable<ModelValidationResult> TranslateValidationResults(IEnumerable<ModelValidationResult> validationResults, ModelMetadata metadata, ControllerContext context, ValidationAttribute validationAttribute) {
if (validationResults == null) {
return validationResults;
}
MvcController mvcController = context.Controller as MvcController;
if (mvcController == null) {
return validationResults;
}
if (!string.IsNullOrWhiteSpace(validationAttribute.ErrorMessageResourceName) && validationAttribute.ErrorMessageResourceType != null) {
// if resource key and resource type is set, do not override..
return validationResults;
}
string translatedText = GetTranslation(metadata, mvcController, validationAttribute);
List<ModelValidationResult> newValidationResults = new List<ModelValidationResult>();
foreach (var validationResult in validationResults) {
ModelValidationResult newValidationResult = new ModelValidationResult();
newValidationResult.Message = string.Format(translatedText, (!string.IsNullOrEmpty(metadata.DisplayName) ? metadata.DisplayName : metadata.PropertyName));
newValidationResults.Add(newValidationResult);
}
return newValidationResults;
}
}

You can use my Griffin.MvcContrib to get easier localization.
Use nuget to download griffin.mvccontrib
Define a string table as described here.
Use the regular [RegularExpression] attribute directly in your view model.
Add this to your string table:
SignUpViewModel_AccountName_RegularExpression "{0} field must contain only letters, numbers or | . | - | _ | characters.
That's it..

Generic string to enum conversion

Suppose enum:
public enum SysLogsAppTypes { None, MonitorService, MonitorTool };
and here is a function to convert from the ToString() representation back to enum:
private SysLogsAppTypes Str2SysLogsAppTypes(string str)
{
try
{
SysLogsAppTypes res = (SysLogsAppTypes)Enum
.Parse(typeof(SysLogsAppTypes), str);
if (!Enum.IsDefined(typeof(SysLogsAppTypes), res))
return SysLogsAppTypes.None;
return res;
}
catch
{
return SysLogsAppTypes.None;
}
}
Is there a way to make this Generic ??
I tried:
private T Str2enum<T>(string str)
{
try
{
T res = (T)Enum.Parse(typeof(T), str);
if (!Enum.IsDefined(typeof(T), res)) return T.None;
return res;
}
catch
{
return T.None;
}
}
but I get:
'T' is a 'type parameter', which is not valid in the given context
where there is T.None
Any help ?
Thanks

I think the default keyword is what you need:
private T Str2enum<T>(string str) where T : struct
{
try
{
T res = (T)Enum.Parse(typeof(T), str);
if (!Enum.IsDefined(typeof(T), res)) return default(T);
return res;
}
catch
{
return default(T);
}
}

Not the way you are trying it, but I use the method below to do this:
public static bool EnumTryParse<E>(string enumVal, out E resOut)
where E : struct
{
var enumValFxd = enumVal.Replace(' ', '_');
if (Enum.IsDefined(typeof(E), enumValFxd))
{
resOut = (E)Enum.Parse(typeof(E),
enumValFxd, true);
return true;
}
// ----------------------------------------
foreach (var value in
Enum.GetNames(typeof (E)).Where(value =>
value.Equals(enumValFxd,
StringComparison.OrdinalIgnoreCase)))
{
resOut = (E)Enum.Parse(typeof(E), value);
return true;
}
resOut = default(E);
return false;
}
No exceptions thrown here ...

I like to add in a defaultValue parameter for an overload of my TryParse for cases where I want a default if it can't be parsed or is null. This is most useful for parsing string.Empty or null.
Note: this implementation will revert to defaultValue if a junk value is passed in - so you may want to tweak that by throwing an exception.
public static T TryParse<T>(string value, T defaultValue) where T: struct
{
if (string.IsNullOrWhiteSpace(value))
{
return defaultValue;
}
T result;
if (Enum.TryParse<T>(value, out result))
{
return result;
}
else
{
return defaultValue; // you may want to throw exception here
}
}
}
ConverterMode mode = EnumUtils<ConverterMode>.TryParse(stringValue, ConverterMode.DefaultMode);

I know this is old, but based on a few samples, I've researched along with #Simon_Weaver's solution, this is what I have:
public static T TryParse(String value, T defaultValue) where T : struct {
if (String.IsNullOrWhiteSpace(value)) {
return defaultValue;
}
T result;
if (!Enum.TryParse(value, out result)) {
if (Enum.IsDefined(typeof (T), result) | result.ToString().Contains(",")) {
// do nothing
} else {
result = defaultValue;
}
} else {
result = defaultValue;
}
return result;
}

C# implementation of deep/recursive object comparison in .net 3.5

I am looking for a C# specific , open source (or source code available) implementation of recursive, or deep, object comparison.
I currently have two graphs of live objects that I am looking to compare to each other, with the result of the comparison being a set of discrepancies in the graphs. The objects are instantiations of a set of classes that are known at run time (but not necessarily at compile time).
There is a specific requirement to be able to map from the discrepancies in the graphs, back to the objects containing the discrepancies.

I found a really nice, free implementation at www.kellermansoftware.com called Compare .NET Objects which can be found here. Highly recommended.
Appears to have relocated to github - most recent version is available here

This is a complex area; I've done some things like this at runtime, and it quickly gets messy. If possible, you might find that the simplest way to do this is to serialize the objects and compare the serialized form (perhaps xml-diff and XmlSerializer). This is complicated a little by the types not being known until runtime, but not hugely (you can always use new XmlSerializer(obj.GetType()) etc).
That would be my default approach, anyway.

Here's an NUnit 2.4.6 custom constraint we use for comparing complex graphs. It supports embedded collections, parent references, setting tolerance for numeric comparisons, identifying field names to ignore (even deep within the hierarchy), and decorating types to be always ignored.
I'm sure this code can be adapted to be used outside NUnit, the bulk of the code isn't dependent on NUnit.
We use this in thousands of unit tests.
using System;
using System.Collections;
using System.Collections.Generic;
using System.Reflection;
using System.Text;
using NUnit.Framework;
using NUnit.Framework.Constraints;
namespace Tests
{
public class ContentsEqualConstraint : Constraint
{
private readonly object expected;
private Constraint failedEquality;
private string expectedDescription;
private string actualDescription;
private readonly Stack<string> typePath = new Stack<string>();
private string typePathExpanded;
private readonly HashSet<string> _ignoredNames = new HashSet<string>();
private readonly HashSet<Type> _ignoredTypes = new HashSet<Type>();
private readonly LinkedList<Type> _ignoredInterfaces = new LinkedList<Type>();
private readonly LinkedList<string> _ignoredSuffixes = new LinkedList<string>();
private readonly IDictionary<Type, Func<object, object, bool>> _predicates = new Dictionary<Type, Func<object, object, bool>>();
private bool _withoutSort;
private int _maxRecursion = int.MaxValue;
private readonly HashSet<VisitedComparison> _visitedObjects = new HashSet<VisitedComparison>();
private static readonly HashSet<string> _globallyIgnoredNames = new HashSet<string>();
private static readonly HashSet<Type> _globallyIgnoredTypes = new HashSet<Type>();
private static readonly LinkedList<Type> _globallyIgnoredInterfaces = new LinkedList<Type>();
private static object _regionalTolerance;
public ContentsEqualConstraint(object expectedValue)
{
expected = expectedValue;
}
public ContentsEqualConstraint Comparing<T>(Func<T, T, bool> predicate)
{
Type t = typeof (T);
if (predicate == null)
{
_predicates.Remove(t);
}
else
{
_predicates[t] = (x, y) => predicate((T) x, (T) y);
}
return this;
}
public ContentsEqualConstraint Ignoring(string fieldName)
{
_ignoredNames.Add(fieldName);
return this;
}
public ContentsEqualConstraint Ignoring(Type fieldType)
{
if (fieldType.IsInterface)
{
_ignoredInterfaces.AddFirst(fieldType);
}
else
{
_ignoredTypes.Add(fieldType);
}
return this;
}
public ContentsEqualConstraint IgnoringSuffix(string suffix)
{
if (string.IsNullOrEmpty(suffix))
{
throw new ArgumentNullException("suffix");
}
_ignoredSuffixes.AddLast(suffix);
return this;
}
public ContentsEqualConstraint WithoutSort()
{
_withoutSort = true;
return this;
}
public ContentsEqualConstraint RecursingOnly(int levels)
{
_maxRecursion = levels;
return this;
}
public static void GlobalIgnore(string fieldName)
{
_globallyIgnoredNames.Add(fieldName);
}
public static void GlobalIgnore(Type fieldType)
{
if (fieldType.IsInterface)
{
_globallyIgnoredInterfaces.AddFirst(fieldType);
}
else
{
_globallyIgnoredTypes.Add(fieldType);
}
}
public static IDisposable RegionalIgnore(string fieldName)
{
return new RegionalIgnoreTracker(fieldName);
}
public static IDisposable RegionalIgnore(Type fieldType)
{
return new RegionalIgnoreTracker(fieldType);
}
public static IDisposable RegionalWithin(object tolerance)
{
return new RegionalWithinTracker(tolerance);
}
public override bool Matches(object actualValue)
{
typePathExpanded = null;
actual = actualValue;
return Matches(expected, actualValue);
}
private bool Matches(object expectedValue, object actualValue)
{
bool matches = true;
if (!MatchesNull(expectedValue, actualValue, ref matches))
{
return matches;
}
// DatesEqualConstraint supports tolerance in dates but works as equal constraint for everything else
Constraint eq = new DatesEqualConstraint(expectedValue).Within(tolerance ?? _regionalTolerance);
if (eq.Matches(actualValue))
{
return true;
}
if (MatchesVisited(expectedValue, actualValue, ref matches))
{
if (MatchesDictionary(expectedValue, actualValue, ref matches) &&
MatchesList(expectedValue, actualValue, ref matches) &&
MatchesType(expectedValue, actualValue, ref matches) &&
MatchesPredicate(expectedValue, actualValue, ref matches))
{
MatchesFields(expectedValue, actualValue, eq, ref matches);
}
}
return matches;
}
private bool MatchesNull(object expectedValue, object actualValue, ref bool matches)
{
if (IsNullEquivalent(expectedValue))
{
expectedValue = null;
}
if (IsNullEquivalent(actualValue))
{
actualValue = null;
}
if (expectedValue == null && actualValue == null)
{
matches = true;
return false;
}
if (expectedValue == null)
{
expectedDescription = "null";
actualDescription = "NOT null";
matches = Failure;
return false;
}
if (actualValue == null)
{
expectedDescription = "not null";
actualDescription = "null";
matches = Failure;
return false;
}
return true;
}
private bool MatchesType(object expectedValue, object actualValue, ref bool matches)
{
Type expectedType = expectedValue.GetType();
Type actualType = actualValue.GetType();
if (expectedType != actualType)
{
try
{
Convert.ChangeType(actualValue, expectedType);
}
catch(InvalidCastException)
{
expectedDescription = expectedType.FullName;
actualDescription = actualType.FullName;
matches = Failure;
return false;
}
}
return true;
}
private bool MatchesPredicate(object expectedValue, object actualValue, ref bool matches)
{
Type t = expectedValue.GetType();
Func<object, object, bool> predicate;
if (_predicates.TryGetValue(t, out predicate))
{
matches = predicate(expectedValue, actualValue);
return false;
}
return true;
}
private bool MatchesVisited(object expectedValue, object actualValue, ref bool matches)
{
var c = new VisitedComparison(expectedValue, actualValue);
if (_visitedObjects.Contains(c))
{
matches = true;
return false;
}
_visitedObjects.Add(c);
return true;
}
private bool MatchesDictionary(object expectedValue, object actualValue, ref bool matches)
{
if (expectedValue is IDictionary && actualValue is IDictionary)
{
var expectedDictionary = (IDictionary)expectedValue;
var actualDictionary = (IDictionary)actualValue;
if (expectedDictionary.Count != actualDictionary.Count)
{
expectedDescription = expectedDictionary.Count + " item dictionary";
actualDescription = actualDictionary.Count + " item dictionary";
matches = Failure;
return false;
}
foreach (DictionaryEntry expectedEntry in expectedDictionary)
{
if (!actualDictionary.Contains(expectedEntry.Key))
{
expectedDescription = expectedEntry.Key + " exists";
actualDescription = expectedEntry.Key + " does not exist";
matches = Failure;
return false;
}
if (CanRecurseFurther)
{
typePath.Push(expectedEntry.Key.ToString());
if (!Matches(expectedEntry.Value, actualDictionary[expectedEntry.Key]))
{
matches = Failure;
return false;
}
typePath.Pop();
}
}
matches = true;
return false;
}
return true;
}
private bool MatchesList(object expectedValue, object actualValue, ref bool matches)
{
if (!(expectedValue is IList && actualValue is IList))
{
return true;
}
var expectedList = (IList) expectedValue;
var actualList = (IList) actualValue;
if (!Matches(expectedList.Count, actualList.Count))
{
matches = false;
}
else
{
if (CanRecurseFurther)
{
int max = expectedList.Count;
if (max != 0 && !_withoutSort)
{
SafeSort(expectedList);
SafeSort(actualList);
}
for (int i = 0; i < max; i++)
{
typePath.Push(i.ToString());
if (!Matches(expectedList[i], actualList[i]))
{
matches = false;
return false;
}
typePath.Pop();
}
}
matches = true;
}
return false;
}
private void MatchesFields(object expectedValue, object actualValue, Constraint equalConstraint, ref bool matches)
{
Type expectedType = expectedValue.GetType();
FieldInfo[] fields = expectedType.GetFields(BindingFlags.Instance | BindingFlags.NonPublic);
// should have passed the EqualConstraint check
if (expectedType.IsPrimitive ||
expectedType == typeof(string) ||
expectedType == typeof(Guid) ||
fields.Length == 0)
{
failedEquality = equalConstraint;
matches = Failure;
return;
}
if (expectedType == typeof(DateTime))
{
var expectedDate = (DateTime)expectedValue;
var actualDate = (DateTime)actualValue;
if (Math.Abs((expectedDate - actualDate).TotalSeconds) > 3.0)
{
failedEquality = equalConstraint;
matches = Failure;
return;
}
matches = true;
return;
}
if (CanRecurseFurther)
{
while(true)
{
foreach (FieldInfo field in fields)
{
if (!Ignore(field))
{
typePath.Push(field.Name);
if (!Matches(GetValue(field, expectedValue), GetValue(field, actualValue)))
{
matches = Failure;
return;
}
typePath.Pop();
}
}
expectedType = expectedType.BaseType;
if (expectedType == null)
{
break;
}
fields = expectedType.GetFields(BindingFlags.Instance | BindingFlags.NonPublic);
}
}
matches = true;
return;
}
private bool Ignore(FieldInfo field)
{
if (_ignoredNames.Contains(field.Name) ||
_ignoredTypes.Contains(field.FieldType) ||
_globallyIgnoredNames.Contains(field.Name) ||
_globallyIgnoredTypes.Contains(field.FieldType) ||
field.GetCustomAttributes(typeof (IgnoreContentsAttribute), false).Length != 0)
{
return true;
}
foreach(string ignoreSuffix in _ignoredSuffixes)
{
if (field.Name.EndsWith(ignoreSuffix))
{
return true;
}
}
foreach (Type ignoredInterface in _ignoredInterfaces)
{
if (ignoredInterface.IsAssignableFrom(field.FieldType))
{
return true;
}
}
return false;
}
private static bool Failure
{
get
{
return false;
}
}
private static bool IsNullEquivalent(object value)
{
return value == null ||
value == DBNull.Value ||
(value is int && (int) value == int.MinValue) ||
(value is double && (double) value == double.MinValue) ||
(value is DateTime && (DateTime) value == DateTime.MinValue) ||
(value is Guid && (Guid) value == Guid.Empty) ||
(value is IList && ((IList)value).Count == 0);
}
private static object GetValue(FieldInfo field, object source)
{
try
{
return field.GetValue(source);
}
catch(Exception ex)
{
return ex;
}
}
public override void WriteMessageTo(MessageWriter writer)
{
if (TypePath.Length != 0)
{
writer.WriteLine("Failure on " + TypePath);
}
if (failedEquality != null)
{
failedEquality.WriteMessageTo(writer);
}
else
{
base.WriteMessageTo(writer);
}
}
public override void WriteDescriptionTo(MessageWriter writer)
{
writer.Write(expectedDescription);
}
public override void WriteActualValueTo(MessageWriter writer)
{
writer.Write(actualDescription);
}
private string TypePath
{
get
{
if (typePathExpanded == null)
{
string[] p = typePath.ToArray();
Array.Reverse(p);
var text = new StringBuilder(128);
bool isFirst = true;
foreach(string part in p)
{
if (isFirst)
{
text.Append(part);
isFirst = false;
}
else
{
int i;
if (int.TryParse(part, out i))
{
text.Append("[" + part + "]");
}
else
{
text.Append("." + part);
}
}
}
typePathExpanded = text.ToString();
}
return typePathExpanded;
}
}
private bool CanRecurseFurther
{
get
{
return typePath.Count < _maxRecursion;
}
}
private static bool SafeSort(IList list)
{
if (list == null)
{
return false;
}
if (list.Count < 2)
{
return true;
}
try
{
object first = FirstNonNull(list) as IComparable;
if (first == null)
{
return false;
}
if (list is Array)
{
Array.Sort((Array)list);
return true;
}
return CallIfExists(list, "Sort");
}
catch
{
return false;
}
}
private static object FirstNonNull(IEnumerable enumerable)
{
if (enumerable == null)
{
throw new ArgumentNullException("enumerable");
}
foreach (object item in enumerable)
{
if (item != null)
{
return item;
}
}
return null;
}
private static bool CallIfExists(object instance, string method)
{
if (instance == null)
{
throw new ArgumentNullException("instance");
}
if (String.IsNullOrEmpty(method))
{
throw new ArgumentNullException("method");
}
Type target = instance.GetType();
MethodInfo m = target.GetMethod(method, new Type[0]);
if (m != null)
{
m.Invoke(instance, null);
return true;
}
return false;
}
#region VisitedComparison Helper
private class VisitedComparison
{
private readonly object _expected;
private readonly object _actual;
public VisitedComparison(object expected, object actual)
{
_expected = expected;
_actual = actual;
}
public override int GetHashCode()
{
return GetHashCode(_expected) ^ GetHashCode(_actual);
}
private static int GetHashCode(object o)
{
if (o == null)
{
return 0;
}
return o.GetHashCode();
}
public override bool Equals(object obj)
{
if (obj == null)
{
return false;
}
if (obj.GetType() != typeof(VisitedComparison))
{
return false;
}
var other = (VisitedComparison) obj;
return _expected == other._expected &&
_actual == other._actual;
}
}
#endregion
#region RegionalIgnoreTracker Helper
private class RegionalIgnoreTracker : IDisposable
{
private readonly string _fieldName;
private readonly Type _fieldType;
public RegionalIgnoreTracker(string fieldName)
{
if (!_globallyIgnoredNames.Add(fieldName))
{
_globallyIgnoredNames.Add(fieldName);
_fieldName = fieldName;
}
}
public RegionalIgnoreTracker(Type fieldType)
{
if (!_globallyIgnoredTypes.Add(fieldType))
{
_globallyIgnoredTypes.Add(fieldType);
_fieldType = fieldType;
}
}
public void Dispose()
{
if (_fieldName != null)
{
_globallyIgnoredNames.Remove(_fieldName);
}
if (_fieldType != null)
{
_globallyIgnoredTypes.Remove(_fieldType);
}
}
}
#endregion
#region RegionalWithinTracker Helper
private class RegionalWithinTracker : IDisposable
{
public RegionalWithinTracker(object tolerance)
{
_regionalTolerance = tolerance;
}
public void Dispose()
{
_regionalTolerance = null;
}
}
#endregion
#region IgnoreContentsAttribute
[AttributeUsage(AttributeTargets.Field)]
public sealed class IgnoreContentsAttribute : Attribute
{
}
#endregion
}
public class DatesEqualConstraint : EqualConstraint
{
private readonly object _expected;
public DatesEqualConstraint(object expectedValue) : base(expectedValue)
{
_expected = expectedValue;
}
public override bool Matches(object actualValue)
{
if (tolerance != null && tolerance is TimeSpan)
{
if (_expected is DateTime && actualValue is DateTime)
{
var expectedDate = (DateTime) _expected;
var actualDate = (DateTime) actualValue;
var toleranceSpan = (TimeSpan) tolerance;
if ((actualDate - expectedDate).Duration() <= toleranceSpan)
{
return true;
}
}
tolerance = null;
}
return base.Matches(actualValue);
}
}
}

This is actually a simple process. Using reflection you can compare each field on the object.
public static Boolean ObjectMatches(Object x, Object y)
{
if (x == null && y == null)
return true;
else if ((x == null && y != null) || (x != null && y == null))
return false;
Type tx = x.GetType();
Type ty = y.GetType();
if (tx != ty)
return false;
foreach(FieldInfo field in tx.GetFields(BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly))
{
if (field.FieldType.IsValueType && (field.GetValue(x).ToString() != field.GetValue(y).ToString()))
return false;
else if (field.FieldType.IsClass && !ObjectMatches(field.GetValue(x), field.GetValue(y)))
return false;
}
return true;
}

Using the Nuget suggested by Jesse and this code I managed to compare two objects with great results.
using KellermanSoftware.CompareNetObjects;
using System;
namespace MyProgram.UnitTestHelper
{
public class ObjectComparer
{
public static bool ObjectsHaveSameValues(object first, object second)
{
CompareLogic cl = new CompareLogic();
ComparisonResult result = cl.Compare(first, second);
if (!result.AreEqual)
Console.WriteLine(result.DifferencesString);
return result.AreEqual;
}
}
}

Here is a simple comparer that we've used with unit testing to assert that two objects have equal properties. It's a mash-up of ideas found in various articles, and handles circular references.
public static class TestHelper
{
public static void AssertAreEqual(Object expected, Object actual, String name)
{
// Start a new check with an empty list of actual objects checked
// The list of actual objects checked is used to ensure that circular references don't result in infinite recursion
List<Object> actualObjectsChecked = new List<Object>();
AssertAreEqual(expected, actual, name, actualObjectsChecked);
}
private static void AssertAreEqual(Object expected, Object actual, String name, List<Object> actualObjectsChecked)
{
// Just return if already checked the actual object
if (actualObjectsChecked.Contains(actual))
{
return;
}
actualObjectsChecked.Add(actual);
// If both expected and actual are null, they are considered equal
if (expected == null && actual == null)
{
return;
}
if (expected == null && actual != null)
{
Assert.Fail(String.Format("The actual value of {0} was not null when null was expected.", name));
}
if (expected != null && actual == null)
{
Assert.Fail(String.Format("The actual value of {0} was null when an instance was expected.", name));
}
// Get / check type info
// Note: GetType always returns instantiated (i.e. most derived) type
Type expectedType = expected.GetType();
Type actualType = actual.GetType();
if (expectedType != actualType)
{
Assert.Fail(String.Format("The actual type of {0} was not the same as the expected type.", name));
}
// If expected is a Primitive, Value, or IEquatable type, assume Equals is sufficient to check
// Note: Every IEquatable type should have also overridden Object.Equals
if (expectedType.IsPrimitive || expectedType.IsValueType || expectedType.IsIEquatable())
{
Assert.IsTrue(expected.Equals(actual), "The actual {0} is not equal to the expected.", name);
return;
}
// If expected is an IEnumerable type, assume comparing enumerated items is sufficient to check
IEnumerable<Object> expectedEnumerable = expected as IEnumerable<Object>;
IEnumerable<Object> actualEnumerable = actual as IEnumerable<Object>;
if ((expectedEnumerable != null) && (actualEnumerable != null))
{
Int32 actualEnumerableCount = actualEnumerable.Count();
Int32 expectedEnumerableCount = expectedEnumerable.Count();
// Check size first
if (actualEnumerableCount != expectedEnumerableCount)
{
Assert.Fail(String.Format("The actual number of enumerable items in {0} did not match the expected number.", name));
}
// Check items in order, assuming order is the same
for (int i = 0; i < actualEnumerableCount; ++i)
{
AssertAreEqual(expectedEnumerable.ElementAt(i), actualEnumerable.ElementAt(i), String.Format("{0}[{1}]", name, i), actualObjectsChecked);
}
return;
}
// If expected is not a Primitive, Value, IEquatable, or Ienumerable type, assume comparing properties is sufficient to check
// Iterate through properties
foreach (PropertyInfo propertyInfo in actualType.GetProperties(BindingFlags.Instance | BindingFlags.Public))
{
// Skip properties that can't be read or require parameters
if ((!propertyInfo.CanRead) || (propertyInfo.GetIndexParameters().Length != 0))
{
continue;
}
// Get properties from both
Object actualProperty = propertyInfo.GetValue(actual, null);
Object expectedProperty = propertyInfo.GetValue(expected, null);
AssertAreEqual(expectedProperty, actualProperty, String.Format("{0}.{1}", name, propertyInfo.Name), actualObjectsChecked);
}
}
public static Boolean IsIEquatable(this Type type)
{
return type.GetInterfaces().Any(x => x.IsGenericType && x.GetGenericTypeDefinition() == typeof(IEquatable<>));
}
}