什么都可以不好，心情不能不好；什么都可以缺乏，自信不能缺乏；什么都可以不要，快乐不能不要；什么都可以忘掉，健身不能忘掉。
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");
}
}
本文.NET 扩展实现代码到此结束。不幸的人才，要更坚强。小编再次感谢大家对我们的支持！