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增强.net的功能需要用到了扩展实现代码，大家可以参考下

class Command
{
public virtual void Execute() { }
}
class InvalidOperationException<T> : InvalidOperationException
where T : Command
{
public InvalidOperationException(string message) : base(message) { }
// some specific information about
// the command type T that threw this exception
}
static class CommandExtensions
{
public static void ThrowInvalidOperationException<TCommand>(
this TCommand command, string message)
where TCommand : Command
{
throw new InvalidOperationException<TCommand>(message);
}
}
class CopyCommand : Command
{
public override void Execute()
{
// after something went wrong:
this.ThrowInvalidOperationException("Something went wrong");
}
}
class CutCommand : Command
{
public override void Execute()
{
// after something went wrong:
this.ThrowInvalidOperationException("Something else went wrong");
}
}

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