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How can I convert string to Guid? [duplicate]

This question already has answers here:
Test if string is a guid without throwing exceptions?
(19 answers)
Closed 5 years ago.
I have string type value like "e2ddfa02610e48e983824b23ac955632". I need to add - in this code means convert in Guid.
EntityKey = "e2ddfa02610e48e983824b23ac955632";
Id = (Guid)paymentRecord.EntityKey;

Just a simple creation:
String source = "e2ddfa02610e48e983824b23ac955632";
Guid result = new Guid(source);

You could do :
Guid guid;
if (Guid.TryParse("e2ddfa02610e48e983824b23ac955632", out guid))
{
// succeed...
}
else
{
// failed...
}
Edit : Like #Silvermind said, if you know the format of the input, you can use Guid.TryParseExact with the "N" format in your case.

For parsing the string to a Guid. You can do this:
var guid= "e2ddfa02610e48e983824b23ac955632";
var result= Guid.ParseExact(guid,"N")
Or if you prefer to have it in a try parse. You can also do this:
Guid result;
if(Guid.TryParseExact(guid,"N",out result))
{
//Do something
}
The "N" is a format which indicates that the string will be format with 32 digits without "-"
Reference:
Guid.TryParseExact Method (String, String, Guid)

C# System.NullException convert null to blank or no value [duplicate]

This question already has answers here:
What is a NullReferenceException, and how do I fix it?
(27 answers)
Closed 7 years ago.
When using the following method there are use cases where one of the parameters, for this example RC_2 (datetime) may pass a null value. I need to have that null value converted into either a blank value or a string value so that it can be passed to a stringbuilder below is what I'm currently using,
public static string CHG_FixDatetime(string RC_1, string RC_2, string seperator)
{
var sb = new StringBuilder();
sb.Append(RC_1);
sb.Append(RC_2);
sb.Append(seperator);
DateTime dt;
if (!string.IsNullorWhiteSpace(RC_2))
sb.append(RC_2)
else
{
sb.Append(Convert.ToString(RC_2));
}
return sb.ToString();
}
I've tried multiple configurations and variations, but I'm unable to get past the System.NullException that is thrown when the RC_2 value is Null. Any help is appreciated.

Try the following solution
RC_2 = String.IsNullOrWhiteSpace(RC_2) ? "" : RC_2;

DataRow to bool casting

I have an xml file from which I read data in the unit test : [DataSource]
For the xml line : <DataBool>true</DataBool>, I try to read value by :
bool bData = (bool)TestContext.DataRow[4];
But it throws exception - invalid casting.What is the possible efficient solution?

If there's no schema associated with it, then it's probably just a string. If so, use bool.Parse or bool.TryParse to convert it from a string to a bool.

When you have int-tinyint value in DB :
int.Parse(dataRow["column_name"].ToString()) == 1 ? true : false

Read content as integer of empty XML element

I encountered a problem while parsing XML in C# with XMLReader.
Here is an example:
string text = xNode.ReadElementContentAsString().Length > 0 ? xBonusesNode.ReadElementContentAsString() : null;
int nmb = xNode.ReadElementContentAsInt();
So, where I'm trying to get string value there is simple inline if statement to check if element has data or not.
How can I do something similar with integer? Or how to catch exception correctly and in best way, for this?

You can use int.TryParse like this:
int number;
bool result = Int32.TryParse(xNode.ReadElementContentAsString, out number);

string text = xNode.ReadElementContentAsString().Length > 0 ? xBonusesNode.ReadElementContentAsString() : null;
Int32.TryParse(text,out myInt);
Should work.
I'm not sure whether the xml library supports nullable types (int?) but the above should work anyway - basically I'm reading it as a string then trying to parse it. If TryParse fails myInt will remain as it was before (and tryParse returns 'false')

How can I check whether a string variable is empty or null in C#? [duplicate]

This question already has answers here:
Easier way of writing null or empty?
(7 answers)
Closed 4 years ago.
How can I check whether a C# variable is an empty string "" or null?
I am looking for the simplest way to do this check. I have a variable that can be equal to "" or null. Is there a single function that can check if it's not "" or null?

if (string.IsNullOrEmpty(myString)) {
//
}

Since .NET 2.0 you can use:
// Indicates whether the specified string is null or an Empty string.
string.IsNullOrEmpty(string value);
Additionally, since .NET 4.0 there's a new method that goes a bit farther:
// Indicates whether a specified string is null, empty, or consists only of white-space characters.
string.IsNullOrWhiteSpace(string value);

if the variable is a string
bool result = string.IsNullOrEmpty(variableToTest);
if you only have an object which may or may not contain a string then
bool result = string.IsNullOrEmpty(variableToTest as string);

if (string.IsNullOrEmpty(myString))
{
. . .
. . .
}

string.IsNullOrEmpty is what you want.

Cheap trick:
Convert.ToString((object)stringVar) == ""
This works because Convert.ToString(object) returns an empty string if object is null. Convert.ToString(string) returns null if string is null.
(Or, if you're using .NET 2.0 you could always using String.IsNullOrEmpty.)