/// <summary>
/// 设置下一个处理者
/// </summary>
/// <param name="handler">下一个处理者</param>
/// <returns>返回下一个处理者</returns>
public ChainOfResponsibilityHandler <TInput, TResult> SetNext(ChainOfResponsibilityHandler <TInput, TResult> handler)
{
if (handler == this)
{
throw new ArgumentException("不能传递自己作为参数");
}
Next = handler;
return(Next);
}
private ChainOfResponsibilityHandler <TInput, TResult> GetHandler()
{
if (Handler != null)
{
return(Handler);
}
Handler = InitChain();
if (Handler == null)
{
throw new ArgumentNullException("InitChain 方法返回空");
}
return(Handler);
}