try & catch

[nicol]

Hi

Error 1 Property or indexer 'System.Exception.Message' cannot be
assigned to -- it is read only

using System;

namespace ConsoleApplication126
{
class Program
{
static void Main(string[] args)
{
string x = null;
try
{
if (x == null)
{
Exception ex = new Exception();
ex.Message = "x was null"; // ****** error**
throw ex;
}
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}

}

}

 

[Alberto Poblacion]

Error 1 Property or indexer 'System.Exception.Message' cannot be
assigned to -- it is read only
Exception ex = new Exception();
ex.Message = "x was null"; // ****** error**

You can pass the message in the constructor:

Exception ex = new Exception("x was null");

 

[nicol]

    You can pass the message in the constructor:

    Exception ex = new Exception("x was null");

thanks it work . . . but could not code it in another way ? ? ?

 

[Family Tree Mike]

thanks it work . . . but could not code it in another way ? ? ?

No, some objects have readonly properties such as this. Only the .Net
developers would know the decision behind doing this for Exception.Message.

 

[Harlan Messinger]

No, some objects have readonly properties such as this. Only the .Net
developers would know the decision behind doing this for Exception.Message.

My guess is that it's to keep handlers in the middle of the call stack
from tampering with exceptions and then rethrowing them.

 

[nicol]

My guess is that it's to keep handlers in the middle of the call stack
from tampering with exceptions and then rethrowing them.

thanks of all

 

[nicol]

My guess is that it's to keep handlers in the middle of the call stack
from tampering with exceptions and then rethrowing them.

thanks of all

 

[Arne Vajhøj]

Error 1 Property or indexer 'System.Exception.Message' cannot be
assigned to -- it is read only

The error message explains what the problem is in plain English.

Arne

 

[Arne Vajhøj]

My guess is that it's to keep handlers in the middle of the call stack
from tampering with exceptions and then rethrowing them.

Immutable classes is in general a good thing.

Arne