I have a rather complicated issue. I am trying to get a unique key from a method and its formal and actual parameters. The goal of the method, is to take a method call, and return a unique key based on 1) The name of the class and method and 2) The name and values of the parameters it is called with.
The method looks like this (sorry for all the details, but I can't find a sensible way to make the example smaller yet still explain my problem)
public class MethodKey
{
public static string GetKey<T>(Expression<Func<T>> method, params string[] paramMembers)
{
var keys = new Dictionary<string, string>();
string scope = null;
string prefix = null;
ParameterInfo[] formalParams = null;
object[] actual = null;
var methodCall = method.Body as MethodCallExpression;
if (methodCall != null)
{
scope = methodCall.Method.DeclaringType.FullName;
prefix = methodCall.Method.Name;
IEnumerable<Expression> actualParams = methodCall.Arguments;
actual = actualParams.Select(GetValueOfParameter<T>).ToArray();
formalParams = methodCall.Method.GetParameters();
}
else
{
// TODO: Check if the supplied expression is something that makes sense to evaluate as a method, e.g. MemberExpression (method.Body as MemberExpression)
var objectMember = Expression.Convert(method.Body, typeof (object));
var getterLambda = Expression.Lambda<Func<object>>(objectMember);
var getter = getterLambda.Compile();
var m = getter();
var m2 = ((System.Delegate) m);
var delegateDeclaringType = m2.Method.DeclaringType;
var actualMethodDeclaringType = delegateDeclaringType.DeclaringType;
scope = actualMethodDeclaringType.FullName;
var ar = m2.Target;
formalParams = m2.Method.GetParameters();
//var m = (System.MulticastDelegate)((Expression.Lambda<Func<object>>(Expression.Convert(method.Body, typeof(object)))).Compile()())
//throw new ArgumentException("Caller is not a method", "method");
}
// null list of paramMembers should disregard all parameters when creating key.
if (paramMembers != null)
{
for (var i = 0; i < formalParams.Length; i++)
{
var par = formalParams[i];
// empty list of paramMembers should be treated as using all parameters
if (paramMembers.Length == 0 || paramMembers.Contains(par.Name))
{
var value = actual[i];
keys.Add(par.Name, value.ToString());
}
}
if (paramMembers.Length != 0 && keys.Count != paramMembers.Length)
{
var notFound = paramMembers.Where(x => !keys.ContainsKey(x));
var notFoundString = string.Join(", ", notFound);
throw new ArgumentException("Unable to find the following parameters in supplied method: " + notFoundString, "paramMembers");
}
}
return scope + "¤" + prefix + "¤" + Flatten(keys);
}
private static object GetValueOfParameter<T>(Expression parameter)
{
LambdaExpression lambda = Expression.Lambda(parameter);
var compiledExpression = lambda.Compile();
var value = compiledExpression.DynamicInvoke();
return value;
}
}
Then, I have the following test, which works OK:
[Test]
public void GetKey_From_Expression_Returns_Expected_Scope()
{
const string expectedScope = "MethodNameTests.DummyObject";
var expected = expectedScope + "¤" + "SayHello" + "¤" + MethodKey.Flatten(new Dictionary<string, string>() { { "name", "Jens" } });
var dummy = new DummyObject();
var actual = MethodKey.GetKey(() => dummy.SayHello("Jens"), "name");
Assert.That(actual, Is.Not.Null);
Assert.That(actual, Is.EqualTo(expected));
}
However, if I put the () => dummy.SayHello("Jens") call in a variable, the call fails. Because I then no longer get a MethodCallExpression in my GetKey method, but a FieldExpression (subclass of MemberExpression. The test is:
[Test]
public void GetKey_Works_With_func_variable()
{
const string expectedScope = "MethodNameTests.DummyObject";
var expected = expectedScope + "¤" + "SayHello" + "¤" + MethodKey.Flatten(new Dictionary<string, string>() { { "name", "Jens" } });
var dummy = new DummyObject();
Func<string> indirection = (() => dummy.SayHello("Jens"));
// This fails. I would like to do the following, but the compiler
// doesn't agree :)
// var actual = MethodKey.GetKey(indirection, "name");
var actual = MethodKey.GetKey(() => indirection, "name");
Assert.That(actual, Is.Not.Null);
Assert.That(actual, Is.EqualTo(expected));
}
The Dummy class SayHello method definitions are trivial:
public class DummyObject
{
public string SayHello(string name)
{
return "Hello " + name;
}
public string Meet(string person1, string person2 )
{
return person1 + " met " + person2;
}
}
I have two questions:
Is there any way to send the variable indirection to MethodKey.GetKey, and get it as a MethodCallExpression type?
If not, how can I get the name and value of the method supplied if I get a MemberExpression instead? I have tried a few bits in the "else" part of the code, but haven't succeeded.
Any help is appreciated.
Thanks in advance, and sorry for the long post.
The problem is you are putting it into the wrong type of variable. Your method expects Expression<Func<T>> and you are using a variable of type Func<string> to store it. The following should fix your problem:
Expression<Func<string>> foo = () => dummy.SayHello("Jens");
var actual = MethodKey.GetKey<string>(foo, "name");
converting a .net Func<T> to a .net Expression<Func<T>> discusses the differences between a Func and an Expression<Func> and converting between the two and at a glance it says don't. The compiler makes them into totally different things. So make it the right thing at compile time and it should work fine.
If this isn't an option then possibly an overload that takes a Func instead of an Expression might work for you.
Note that in both cases I would pass the variable directly rather than trying to make it into a new expression in your call.
Related
This question already has answers here:
Is there a "String.Format" that can accept named input parameters instead of index placeholders? [duplicate]
(9 answers)
Closed 4 years ago.
I'm trying to format some string dynamically with available variables in a specific context/scope.
This strings would have parts with things like {{parameter1}}, {{parameter2}} and these variables would exist in the scope where I'll try to reformat the string. The variable names should match.
I looked for something like a dynamically string interpolation approach, or how to use FormattableStringFactory, but I found nothing that really gives me what I need.
var parameter1 = DateTime.Now.ToString();
var parameter2 = "Hello world!";
var retrievedString = "{{parameter2}} Today we're {{parameter1}}";
var result = MagicMethod(retrievedString, parameter1, parameter2);
// or, var result = MagicMethod(retrievedString, new { parameter1, parameter2 });
Is there an existing solution or should I (in MagicMethod) replace these parts in the retrievedString with matching members of the anonymous object given as parameter (using reflection or something like that)?
EDIT:
Finally, I created an extension method to handle this:
internal static string SpecialFormat(this string input, object parameters) {
var type = parameters.GetType();
System.Text.RegularExpressions.Regex regex = new System.Text.RegularExpressions.Regex( "\\{(.*?)\\}" );
var sb = new System.Text.StringBuilder();
var pos = 0;
foreach (System.Text.RegularExpressions.Match toReplace in regex.Matches( input )) {
var capture = toReplace.Groups[ 0 ];
var paramName = toReplace.Groups[ toReplace.Groups.Count - 1 ].Value;
var property = type.GetProperty( paramName );
if (property == null) continue;
sb.Append( input.Substring( pos, capture.Index - pos) );
sb.Append( property.GetValue( parameters, null ) );
pos = capture.Index + capture.Length;
}
if (input.Length > pos + 1) sb.Append( input.Substring( pos ) );
return sb.ToString();
}
and I call it like this:
var parameter1 = DateTime.Now.ToString();
var parameter2 = "Hello world!";
var retrievedString = "{parameter2} Today we're {parameter1}";
var result = retrievedString.SpecialFormat( new { parameter1, parameter2 } );
Now, I don't use double braces anymore.
You can use reflection coupled with an anonymous type to do this:
public string StringFormat(string input, object parameters)
{
var properties = parameters.GetType().GetProperties();
var result = input;
foreach (var property in properties)
{
result = result.Replace(
$"{{{{{property.Name}}}}}", //This is assuming your param names are in format "{{abc}}"
property.GetValue(parameters).ToString());
}
return result;
}
And call it like this:
var result = StringFormat(retrievedString, new { parameter1, parameter2 });
While not understanding what is the dificulty you're having, I'm placing my bet on
Replace( string oldValue, string newValue )
You can replace your "tags" with data you want.
var parameter1 = DateTime.Now.ToString();
var parameter2 = "Hello world!";
var retrievedString = "{{parameter2}} Today we're {{parameter1}}";
var result = retrievedString.Replace("{{parameter2}}", parameter2).Replace({{parameter1}}, parameter1);
EDIT
Author mentioned that he's looking at something that will take parameters and iterate the list. It can be done by something like
public static void Main(string[] args)
{
//your "unmodified" srting
string text = "{{parameter2}} Today we're {{parameter1}}";
//key = tag(explicitly) value = new string
Dictionary<string, string> tagToStringDict = new Dictionary<string,string>();
//add tags and it's respective replacement
tagToStringDict.Add("{{parameter1}}", "Foo");
tagToStringDict.Add("{{parameter2}}", "Bar");
//this returns your "modified string"
changeTagWithText(text, tagToStringDict);
}
public static string changeTagWithText(string text, Dictionary<string, string> dict)
{
foreach (KeyValuePair<string, string> entry in dict)
{
//key is the tag ; value is the replacement
text = text.Replace(entry.Key, entry.Value);
}
return text;
}
The function changeTagWithText will return:
"Bar Today we're Foo"
Using this method you can add all the tags to the Dictionary and it'll replace all automatically.
If you know order of parameters, you can use string.Format() method (msdn). Then, your code will look like:
var parameter1 = DateTime.Now.ToString();
var parameter2 = "Hello world!";
var retrievedString = "{{0}} Today we're {{1}}";
var result = string.Format(retrievedString, parameter2, parameter1);
I wrote a function to convert LocalDeclaration's to Global Resources. Right now I'm replacing with each definition with a property, but I want to replace it with a property using the new syntax =>
public PropertyDeclarationSyntax ConvertToResourceProperty(string resouceClassIdentifier, string fieldName, string resourceKey, CSharpSyntaxNode field)
{
var stringType = SyntaxFactory.ParseTypeName("string");
var resourceReturnIdentifier = SyntaxFactory.IdentifierName(resouceClassIdentifier + "." + resourceKey);
var returnResourceStatement = SyntaxFactory.ReturnStatement(resourceReturnIdentifier).NormalizeWhitespace();
var getRescourceBlock = SyntaxFactory.Block(returnResourceStatement);
var getAccessor = SyntaxFactory.AccessorDeclaration(SyntaxKind.GetAccessorDeclaration, getRescourceBlock).WithAdditionalAnnotations(Formatter.Annotation, Simplifier.Annotation);
var propertyDeclaration = SyntaxFactory.PropertyDeclaration(stringType, fieldName).AddModifiers(SyntaxFactory.Token(SyntaxKind.PublicKeyword), SyntaxFactory.Token(SyntaxKind.StaticKeyword)).NormalizeWhitespace();
propertyDeclaration = propertyDeclaration.AddAccessorListAccessors(getAccessor).WithAdditionalAnnotations(Formatter.Annotation);
SyntaxTrivia[] leadingTrivia = field.GetLeadingTrivia().ToArray() ?? new[] { SyntaxFactory.Whitespace("\t") };
return propertyDeclaration.WithTrailingTrivia(SyntaxFactory.Whitespace("\r\n"))
.WithLeadingTrivia(leadingTrivia)
.WithAdditionalAnnotations(Simplifier.Annotation);
}
This code create a property like so:
public static string LocalResourceName
{
get{ return Resources.LocalResourceName; }
}
I would like it to make the property like so:
public static string LocalResourceName =>Resources.LocalResourceName;
I'm not too sure what will create an expression bodied property from the syntaxfactory? Can anyone point me to the right method?
After scouring the internet I've found a way to do it. Why is there no documentation for roslyn?
public PropertyDeclarationSyntax ConvertToResourceProperty(string resouceClassIdentifier, string fieldName, string resourceKey, CSharpSyntaxNode field)
{
var stringType = SyntaxFactory.ParseTypeName("string");
var resourceClassName = SyntaxFactory.IdentifierName(resouceClassIdentifier);
var resourceKeyName = SyntaxFactory.IdentifierName(resourceKey);
var memberaccess = SyntaxFactory.MemberAccessExpression(SyntaxKind.SimpleMemberAccessExpression, resourceClassName, resourceKeyName);
var propertyLambda = SyntaxFactory.ArrowExpressionClause(memberaccess);
var propertyDeclaration = SyntaxFactory.PropertyDeclaration(new SyntaxList<AttributeListSyntax>(), new SyntaxTokenList(),
stringType, null, SyntaxFactory.Identifier(fieldName), null,
propertyLambda, null, SyntaxFactory.Token(SyntaxKind.SemicolonToken))
.AddModifiers(SyntaxFactory.Token(SyntaxKind.PublicKeyword),
SyntaxFactory.Token(SyntaxKind.StaticKeyword)).WithAdditionalAnnotations(Formatter.Annotation).NormalizeWhitespace();
return propertyDeclaration.WithTrailingTrivia(SyntaxFactory.ElasticCarriageReturnLineFeed)
.WithLeadingTrivia(field.GetLeadingTrivia().ToArray())
.WithAdditionalAnnotations(Simplifier.Annotation);
}
I have a simple method which retrieves a table from an azure mobile service.
public static async List<T>GetDataFromListTable<T>()
{
var data = await MobileService.GetTable<T>().ToListAsync();
return data.Count != 0 ? data : null;
}
This works fine.
What I am trying to do is have another method that takes a parameter name which is returned from the service and return the value of that parameter. So far I have this
public static async Task<T> GetDataFromTable<T>(string paramName)
{
var k = Activator.CreateInstance(typeof(T));
var members = typeof(T).GetProperties().Select(t=>t.Name).ToList();
if (!members.Contains(paramName))
return (T)k;
var mn = typeof(T).GetProperties()[members.IndexOf(paramName)];
var data = GetDataFromListTable<T>();
var retval = data.Select(t => t.mn);
}
The issue is obviously that I can't do the Linq query as T doesn't contain mn. I can also not use
var retval = data.Select(t=>t.paramName);
as paramname is a just a string representation of a member within a class.
In a nutshell...
method 1 has the parameter name, grabs a list from method 2. From the returned list in method 2, find the parameter name and return the associated value.
Is there a way to do what I'm trying to do?
You can do:
var retval = data.Select(t => mn.GetGetMethod().Invoke(t, null));
or
var retval = data.Select(t => mn.GetValue(t, null));
You can also simplify your code with something like this (not tested, sorry):
public static async Task<T> GetDataFromTable<T>(string paramName)
{
var k = Activator.CreateInstance(typeof(T));
var mn = typeof(T).GetProperty(paramName);
if (mn == null)
return (T)k;
var data = GetDataFromListTable<T>();
var retval = data.Select(t => mn.GetGetMethod().Invoke(t, null));
...
}
I think using expression trees would be more convenient since you're working with collections. Your method signature needs to incorporate the types T and TResult since it is using Select which returns an IEnumerable<TResult>.
public static async Task<IEnumerable<TResult>> SelectData<T, TResult>(
string propertyName
)
{
if(string.IsNullOrWhiteSpace(propertyName))
{
return Enumerable.Empty<TResult>();
}
var dataTask = GetTableData<T>();
var tType = Expression.Parameter(typeof(T), "t");
var property = Expression.Property(tType, propertyName);
var selectExpression =
Expression.Lambda<Func<T, TResult>>(property, tType)
.Compile();
return (await dataTask).Select(selectExpression);
}
Isn't it possible to do this
var retval = data.Select(t => mn.GetValue(t, null));
I am faced with following code for retrieving data through reflections:
public object GetValue(object source)
{
if (Member == null) return Argument;
try
{
object[] argList = (Argument == null ? null : new object[] { Argument });
if (Member is PropertyInfo) return ((PropertyInfo)Member).GetValue(source, argList);
if (Member is MethodInfo) return ((MethodInfo)Member).Invoke(source, argList);
if (Member is FieldInfo) return ((FieldInfo)Member).GetValue(source);
throw new Exception("Unknown member type: " + Member);
}
catch (Exception ex)
{
throw new Exception("Could not get value " + Member.Name + " from " + source + " with " + Argument, ex);
}
}
This is however very slow, and I am thinking of replacing the reflections with something faster, maybe delegates? However, I am not sure that delegates is the best choice or how to implement it in this case. I am running .NET 4.0. Any suggestions are appreciated!
This is a little faster
static Func<object, object[], object> BuildCaller(MethodInfo method)
{
var obj = Expression.Parameter(typeof(object));
var pars = Expression.Parameter(typeof(object[]));
var pars2 = method.GetParameters();
var casted = new Expression[pars2.Length];
for (int i = 0; i < pars2.Length; i++)
{
casted[i] = Expression.Convert(Expression.ArrayAccess(pars, Expression.Constant(i)), pars2[i].ParameterType);
}
var call = Expression.Call(Expression.Convert(obj, method.DeclaringType), method, casted);
var cast = Expression.Convert(call, typeof(object));
var lamdba = Expression.Lambda<Func<object, object[], object>>(cast, obj, pars);
return lamdba.Compile();
}
static Func<object, object[], object> BuildCaller(FieldInfo field)
{
var obj = Expression.Parameter(typeof(object));
var pars = Expression.Parameter(typeof(object[]));
var call = Expression.Field(Expression.Convert(obj, field.DeclaringType), field);
var cast = Expression.Convert(call, typeof(object));
var lamdba = Expression.Lambda<Func<object, object[], object>>(cast, obj, pars);
return lamdba.Compile();
}
static Func<object, object[], object> BuildCaller(PropertyInfo property)
{
var obj = Expression.Parameter(typeof(object));
var pars = Expression.Parameter(typeof(object[]));
var pars2 = property.GetIndexParameters();
var casted = new Expression[pars2.Length];
for (int i = 0; i < pars2.Length; i++)
{
casted[i] = Expression.Convert(Expression.ArrayAccess(pars, Expression.Constant(i)), pars2[i].ParameterType);
}
var call = Expression.Property(Expression.Convert(obj, property.DeclaringType), property, casted);
var cast = Expression.Convert(call, typeof(object));
var lamdba = Expression.Lambda<Func<object, object[], object>>(cast, obj, pars);
return lamdba.Compile();
}
I create a delegate (through Expressions) that precaches the method. If Arguments are "fixed" you could go a step further and precache even their conversion (as is the conversion is done each time the method is called)
This is an example for methods. For properties and fields it's similar (for fields it's even easier).
And an example of use
var fun = BuildCaller(typeof(MyClass).GetMethod("MyMethod"));
var mc = new MyClass();
fun(mc, new object[] { 1, 2.0 });
You must cache fun together with your Method
I'd like to use a PropertyGrid to input method parameters.
I have some application that will dynamically load user's DLLs and invoke methods with specific signature (a known return type).
I'd like to present the user the option to input the arguments to the called method easily with a PropertyGrid control.
Problem is -- PropertyGrid works on an Object, and not on a method.
I'd like to somehow "transform" the method at runtime into an object with properties reflecting its arguments, passing the input values to the method when invoking it.
Offcourse i'd like to have type validation, etc (if provided by the PropertyGrid, dont remember right now).
Is there any easy solution for this?
Thanks!
Well here is what I've written yesterday.
It is meant to be run in LinqPad, which is an awesome free tool to test linq queries or code snippets. (With an inexpensive upgrade to get intellisense)
The code should tell you how to deal with different kind of parameters (ref, out) and whether you are calling an instance method or not. (flip the comments in Main to test an instance method)
In LinqPad, you can use the Dump() extension method to let it show your objects in the results window. this is handy to see what is actually happening.
So, if you want to know how to dynamically construct a type and invoke it, this should get you started:
EDIT: I totally forgot to mention, that you do need to add these 2 namespaces to the query. You do that by hitting F4->additional namespace imports and adding these 2:
System.CodeDom.Compiler
System.CodeDom
public static String TestMethod1(int a, ref int X, out string t)
{
a += X;
X = a * 2;
t = "...>" + (X + a);
return a.ToString() + "...";
}
public class TestClass
{
public int SomeMethod(int a, DateTime? xyz)
{
if(xyz != null)
a+= xyz.GetValueOrDefault().Day;
return 12 + a;
}
}
void Main()
{
var sb = new StringBuilder();
var methodInfo = typeof(UserQuery).GetMethod("TestMethod1");
dynamic instance = CreateWrapper(methodInfo, sb);
instance.a = 11;
instance.X = 2;
instance.CallMethod();
/*
var methodInfo = typeof(TestClass).GetMethod("SomeMethod");
dynamic instance = CreateWrapper(methodInfo, sb);
instance.a = 11;
instance.xyz = new DateTime(2010, 1, 2);
instance.CallMethod(new TestClass());
*/
((Object)instance).Dump();
sb.ToString().Dump();
}
static object CreateWrapper(MethodInfo methodInfo, StringBuilder sb)
{
// pick either C#, VB or another language that can handle generics
var codeDom = CodeDomProvider.CreateProvider("C#");
var unit = new CodeCompileUnit();
var codeNameSpace = new CodeNamespace();
codeNameSpace.Name = "YourNamespace";
var wrapperType = AddWrapperType(codeDom, codeNameSpace, methodInfo, "WrapperType", "MethodResultValue");
unit.Namespaces.Add(codeNameSpace);
// this is only needed so that LinqPad can dump the code
codeDom.GenerateCodeFromNamespace(codeNameSpace, new StringWriter(sb), new CodeGeneratorOptions());
// put the temp assembly in LinqPad's temp folder
var outputFileName = Path.Combine(Path.GetDirectoryName(new Uri(typeof(UserQuery).Assembly.CodeBase).AbsolutePath),
Guid.NewGuid() + ".dll");
var results = codeDom.CompileAssemblyFromDom(new CompilerParameters(new[]{new Uri(methodInfo.DeclaringType.Assembly.CodeBase).AbsolutePath,
new Uri(typeof(UserQuery).Assembly.CodeBase).AbsolutePath,
new Uri(typeof(UserQuery).BaseType.Assembly.CodeBase).AbsolutePath}.Distinct().ToArray(),
outputFileName),
unit);
results.Errors.Dump();
new Uri(results.CompiledAssembly.CodeBase).AbsolutePath.Dump();
if(results.Errors.Count == 0)
{
var compiledType = results.CompiledAssembly.GetType(codeNameSpace.Name + "." + wrapperType.Name);
return Activator.CreateInstance(compiledType);
}
return null;
}
static CodeTypeDeclaration AddWrapperType(CodeDomProvider codeDom,
CodeNamespace codeNameSpace,
MethodInfo methodInfo,
string typeName,
string resultPropertyName)
{
var parameters = (from parameter in methodInfo.GetParameters()
select parameter).ToList();
var returnValue = methodInfo.ReturnType;
if(!String.IsNullOrEmpty(methodInfo.DeclaringType.Namespace))
codeNameSpace.Imports.Add(new CodeNamespaceImport(methodInfo.DeclaringType.Namespace));
var wrapperType = new CodeTypeDeclaration(typeName);
var defaultAttributes = MemberAttributes.Public | MemberAttributes.Final;
var thisRef = new CodeThisReferenceExpression();
Func<Type, Type> getRealType = t => t.IsByRef || t.IsPointer ? t.GetElementType(): t;
Func<String, String> getFieldName = parameterName => "m_" + parameterName + "_Field";
Action<ParameterInfo> addProperty = p =>
{
var realType = getRealType(p.ParameterType);
var usedName = p.Position == -1 ? resultPropertyName : p.Name;
wrapperType.Members.Add(new CodeMemberField
{
Name = getFieldName(usedName),
Type = new CodeTypeReference(realType),
Attributes= MemberAttributes.Private
});
var property = new CodeMemberProperty
{
Name = usedName,
Type = new CodeTypeReference(realType),
Attributes= defaultAttributes
};
property.GetStatements.Add(new CodeMethodReturnStatement(new CodeFieldReferenceExpression(thisRef,
getFieldName(usedName))));
property.SetStatements.Add(new CodeAssignStatement(new CodeFieldReferenceExpression(thisRef, getFieldName(usedName)),
new CodeArgumentReferenceExpression("value")));
wrapperType.Members.Add(property);
};
parameters.ForEach(addProperty);
if(methodInfo.ReturnParameter != null)
{
addProperty(methodInfo.ReturnParameter);
}
var callMethod = new CodeMemberMethod
{
Name="CallMethod",
Attributes=defaultAttributes
};
CodeMethodInvokeExpression invokeExpr;
if(!methodInfo.IsStatic)
{
callMethod.Parameters.Add(new CodeParameterDeclarationExpression(methodInfo.DeclaringType,
"instance"));
invokeExpr = new CodeMethodInvokeExpression(new CodeArgumentReferenceExpression("instance"),
methodInfo.Name);
}
else
invokeExpr = new CodeMethodInvokeExpression(new CodeTypeReferenceExpression(methodInfo.DeclaringType), methodInfo.Name);
foreach(var parameter in parameters)
{
CodeExpression fieldExpression = new CodeFieldReferenceExpression(thisRef,
getFieldName(parameter.Name));
if(parameter.ParameterType.IsByRef && !parameter.IsOut)
fieldExpression = new CodeDirectionExpression(FieldDirection.Ref, fieldExpression);
else if(parameter.IsOut)
fieldExpression = new CodeDirectionExpression(FieldDirection.Out, fieldExpression);
else if(parameter.IsIn)
fieldExpression = new CodeDirectionExpression(FieldDirection.In, fieldExpression);
invokeExpr.Parameters.Add(fieldExpression);
}
wrapperType.Members.Add(callMethod);
if(returnValue != typeof(void))
callMethod.Statements.Add(new CodeAssignStatement(new CodeFieldReferenceExpression(thisRef,
getFieldName(resultPropertyName)),
invokeExpr));
else
callMethod.Statements.Add(invokeExpr);
codeNameSpace.Types.Add(wrapperType);
return wrapperType;
}
I think you could add a new class to your project that implement the ICustomTypeDescriptor interface. And use the instance of this class as the wrapper of your method parameters.
Here is an article shows how to custom property grid display by implementing ICustomTypeDescriptor.