带有函数参数的ThreadPool.QueueUserWorkItem [英] ThreadPool.QueueUserWorkItem with function argument

问题描述

我正在使用C＃2.0，并且想借助 ThreadPool.QueueUserWorkItem 调用带有几个参数的方法，所以我尝试如下：

I am using C# 2.0 and want to call a method with a couple of parameters with the help of ThreadPool.QueueUserWorkItem, so I tried as follows:

ThreadPool.QueueUserWorkItem(new WaitCallback(Multiply(2, 3)));

private int Multiply(int x,int y)
{
  int z=(x*y);
  return z;
}

我遇到编译错误。因此，请指导我，如何使用 ThreadPool.QueueUserWorkItem 调用具有多个参数的函数？

I am getting compilation error. So please guide me, how can I call a function with multiple arguments with ThreadPool.QueueUserWorkItem?.

我有另一个查询，当我使用 ThreadPool.QueueUserWorkItem 时，如何在此处使用匿名函数我可以在那里编写代码，而不用调用另一个函数。如果可以在C＃v2.0中使用，请为我提供代码。

I have another query that when I am using ThreadPool.QueueUserWorkItem then how to use here anonymous function as a result I can write the code there instead of calling another function. If it is possible in C# v2.0 then please guide me with code.

推荐答案

您应该声明一个具有相同方法的方法定义为WaitCallback委托。您可以使用以下代码段：

You should declare a method which have the same definition as WaitCallback delegate. You can use the following code snippet:

ThreadPool.QueueUserWorkItem(Multiply, new object[] { 2, 3 }); 

public static void Multiply(object state)
{
    object[] array = state as object[];
    int x = Convert.ToInt32(array[0]);
    int y = Convert.ToInt32(array[1]);
}

匿名代表版本为：

 ThreadPool.QueueUserWorkItem(delegate(object state)
    {
        object[] array = state as object[];
        int x = Convert.ToInt32(array[0]);
        int y = Convert.ToInt32(array[1]);
    }
    , new object[] { 2, 3 });

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