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Compiler Warning (level 1) CS1058

A previous catch clause already catches all exceptions. All exceptions thrown will be wrapped in a System.Runtime.CompilerServices.RuntimeWrappedException

This attribute causes CS1058 if a catch() block has no specified exception type after a catch (System.Exception e) block. The warning advises that the catch() block will not catch any exceptions.

A catch() block after a catch (System.Exception e) block can catch non-CLS exceptions if the RuntimeCompatibilityAttribute is set to false in the AssemblyInfo.cs file: [assembly: RuntimeCompatibilityAttribute(WrapNonExceptionThrows = false)]. If this attribute is not set explicitly to false, all thrown non-CLS exceptions are wrapped as Exceptions and the catch (System.Exception e) block catches them. For more information, see How to: Catch a non-CLS Exception.

The following example generates CS1058.

// CS1058.cs
// CS1058 expected
using System.Runtime.CompilerServices;

// the following attribute is set to true by default in the C# compiler
// set to false in your source code to resolve CS1058
[assembly: RuntimeCompatibilityAttribute(WrapNonExceptionThrows = true)]

class TestClass 
{
   static void Main() 
   {
      try {}

      catch (System.Exception e) { 
         System. Console.WriteLine("Caught exception {0}", e);
      }

      catch {}   // CS1058. This line will never be reached.
   }
}
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