C# – Error: Extension method must be defined in a non-generic static class

cextension-methods

I get the following compilation error at the class name.

Extension method must be defined in a non-generic static class

I am not using normal class. What could be the reason for this. I don't know and don't want to use extension methods.

Best Answer

As requested, here is my comment as an answer:

Without your code there isn't much we can do. My best guess is that you accidentally typed "this" somewhere in a parameter list.

Related Solutions

C# – Create Generic method constraining T to an Enum

Since Enum Type implements IConvertible interface, a better implementation should be something like this:

public T GetEnumFromString<T>(string value) where T : struct, IConvertible
{
   if (!typeof(T).IsEnum) 
   {
      throw new ArgumentException("T must be an enumerated type");
   }

   //...
}

This will still permit passing of value types implementing IConvertible. The chances are rare though.

C# – add extension methods to an existing static class

No. Extension methods require an instance variable (value) for an object. You can however, write a static wrapper around the ConfigurationManager interface. If you implement the wrapper, you don't need an extension method since you can just add the method directly.

 public static class ConfigurationManagerWrapper
 {
      public static ConfigurationSection GetSection( string name )
      {
         return ConfigurationManager.GetSection( name );
      }

      .....

      public static ConfigurationSection GetWidgetSection()
      {
          return GetSection( "widgets" );
      }
 }

Best Answer

Related Solutions

C# – Create Generic method constraining T to an Enum

C# – add extension methods to an existing static class

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