利用VC＃ 创作简单的多线程组件

创建 Calculator 组件

　　从“项目”菜单中选择“添加组件”。

　　将组件命名为 Calculator。

　　向 Calculator 组件添加公共变量

　　为 Calculator 打开代码编辑器。

　　添加创建公共变量的语句，这些变量用于将值从 frmCalculations 传递给每个线程。

　　变量 varTotalCalculations 将保留该组件执行的计算总数的累计值，而其他变量将接收来自窗体的值。

public int varAddTwo; public int varFact1; public int varFact2; public int varLoopValue; public double varTotalCalculations = 0;

　　向 Calculator 组件添加方法和事件

　　为事件声明委托，组件将使用这些事件向窗体传递值。

　　注意 尽管您将声明 4 个事件，但由于其中的两个事件将具有相同的签名，因此只需要创建 3 个委托。

　　紧接着上一步输入的变量声明的下方，键入下列代码：

// This delegate will be invoked with two of your events. public delegate void FactorialCompleteHandler(double Factorial, double TotalCalculations); public delegate void AddTwoCompleteHandler(int Result, double TotalCalculations); public delegate void LoopCompleteHandler(double TotalCalculations, int Counter);

　　声明组件将用来与应用程序进行通信的事件。为实现此目的，紧接着上一步输入的代码的下方，添加下列代码。

public event FactorialCompleteHandler FactorialComplete; public event FactorialCompleteHandler FactorialMinusOneComplete; public event AddTwoCompleteHandler AddTwoComplete; public event LoopCompleteHandler LoopComplete;

　　紧接着上一步键入的代码的下方，键入下列代码：

// This method will calculate the value of a number minus 1 factorial // (varFact2-1!). public void FactorialMinusOne() { double varTotalAsOfNow = 0; double varResult = 1; // Performs a factorial calculation on varFact2 - 1. for (int varX = 1; varX <= varFact2 - 1; varX++) { varResult *= varX; // Increments varTotalCalculations and keeps track of the current // total as of this instant. varTotalCalculations += 1; varTotalAsOfNow = varTotalCalculations; } // Signals that the method has completed, and communicates the // result and a value of total calculations performed up to this // point. FactorialMinusOneComplete(varResult, varTotalAsOfNow); } // This method will calculate the value of a number factorial. // (varFact1!) public void Factorial() { double varResult = 1; double varTotalAsOfNow = 0; for (int varX = 1; varX <= varFact1; varX++) { varResult *= varX; varTotalCalculations += 1; varTotalAsOfNow = varTotalCalculations; } FactorialComplete(varResult, varTotalAsOfNow); } // This method will add two to a number (varAddTwo+2). public void AddTwo() { double varTotalAsOfNow = 0; int varResult = varAddTwo + 2; varTotalCalculations += 1; varTotalAsOfNow = varTotalCalculations; AddTwoComplete(varResult, varTotalAsOfNow); } // This method will run a loop with a nested loop varLoopValue times. public void RunALoop() { int varX; double varTotalAsOfNow = 0; for (varX = 1; varX <= varLoopValue; varX++) { // This nested loop is added solely for the purpose of slowing down // the program and creating a processor-intensive application. for (int varY = 1; varY <= 500; varY++) { varTotalCalculations += 1; varTotalAsOfNow = varTotalCalculations; } } LoopComplete(varTotalAsOfNow, varLoopValue); }