想使用委托函数代替Console.Readline()，下面的程序错在什么地方？

[leichow]

delegate string readscreen ();
static void Main(string[] args)
{
readscreen readline;
readline=new readscreen(read);
string r =Convert.ToString(readline);
Console.WriteLine("Your words are {0}", r);

}
static string read()
{
string line = Console.ReadLine();
return line;
}

[SqlServer2008]

  string r =Convert.ToString(readline());

[SqlServer2008]

string r =Convert.ToString(readline());

[bobobool]

delegate string readscreen();
static void Main(string[] args)
{
readscreen readline;
readline = new readscreen(read);
string r = Convert.ToString(readline()); Console.WriteLine("Your words are {0}", r);
Console.Read();
}
static string read()
{
string line = Console.ReadLine();
return line;
}

[香儿爱土豆]

根据你的意义，应该没有问题：

delegate string ReadEventHandler();

static void Main(string[] args)
{
ReadEventHandler readline=new ReadEventHandler();
Console.WriteLine(readline);
}

static string Read()
{
string line = Console.ReadLine();
return line;
}

以上代码返回：工程名称.Programe+ReadEventHandler;

[香儿爱土豆]

上面纠正下：ReadEventHandler readline=new ReadEventHandler(Read);

或者如下写：
static void Main(string[] args)
{
ReadEventHandler readline=delegate()
{
string line = Console.ReadLine();
return line;
};
}
OR
static void Main(string[] args)
{
ReadEventHandler readline=new ReadEventHandler(()=>
{
string line = Console.ReadLine();
return line;
});
}

[a371014988]

delegate string readscreen ();

这个委托的使用方法，
readscreen read=new readscreen(target);

调用方法： read();或read.invoke();

[a371014988]

        /// <summary>
        /// 保存缓存
        /// </summary>
        /// <param name="key">键</param>
        /// <param name="value">值</param>
        public void SaveCache(object key, object value)
        {
            SaveCacheHandler handler = new SaveCacheHandler(SaveCacheInvoke);
            IAsyncResult ar = handler.BeginInvoke(key, value, new AsyncCallback(SaveCacheCallBack), null);
        }

        private void SaveCacheInvoke(object key, object value)
        {
            lock (hashtable.SyncRoot)
            {
                hashtable[key] = value;
            }
        }

        private void SaveCacheCallBack(IAsyncResult ar)
        {
            SaveCacheHandler handler = (SaveCacheHandler)((AsyncResult)ar).AsyncDelegate;
            handler.EndInvoke(ar);
        }