利用VC＃ 创作简单的多线程组件

将用户输入传输到组件

　　下一步是向 frmCalculations 添加代码，以接收用户输入，以及从 Calculator 组件接收值和向它传输值。

　　实现 frmCalculations 的前端功能

　　在代码编辑器中打开 frmCalculations。

　　找到 public class frmCalculations 语句。紧接着 { 的下方键入：

Calculator Calculator1;

　　找到构造函数。紧接着 } 之前，添加以下行：

// Creates a new instance of Calculator. Calculator1 = new Calculator();

　　在设计器中单击每个按钮，为每个控件的单击事件处理程序生成代码大纲，并添加代码以创建这些处理程序。

　　完成后，单击事件处理程序应该类似于以下形式：

private void btnFactorial1_Click(object sender, System.EventArgs e) // Passes the value typed in the txtValue to Calculator.varFact1. { Calculator1.varFact1 = int.Parse(txtValue.Text); // Disables the btnFactorial1 until this calculation is complete. btnFactorial1.Enabled = false; Calculator1.Factorial(); } private void btnFactorial2_Click(object sender, System.EventArgs e) { Calculator1.varFact2 = int.Parse(txtValue.Text); btnFactorial2.Enabled = false; Calculator1.FactorialMinusOne(); } private void btnAddTwo_Click(object sender, System.EventArgs e) { Calculator1.varAddTwo = int.Parse(txtValue.Text); btnAddTwo.Enabled = false; Calculator1.AddTwo(); } private void btnRunLoops_Click(object sender, System.EventArgs e) { Calculator1.varLoopValue = int.Parse(txtValue.Text); btnRunLoops.Enabled = false; // Lets the user know that a loop is running lblRunLoops.Text = "Looping"; Calculator1.RunALoop(); }

　　在上一步添加的代码的下方，键入以下代码以处理窗体将从 Calculator1 接收的事件：

protected void FactorialHandler(double Value, double Calculations) // Displays the returned value in the appropriate label. { lblFactorial1.Text = Value.ToString(); // Re-enables the button so it can be used again. btnFactorial1.Enabled = true; // Updates the label that displays the total calculations performed lblTotalCalculations.Text = "TotalCalculations are " + Calculations.ToString(); } protected void FactorialMinusHandler(double Value, double Calculations) { lblFactorial2.Text = Value.ToString(); btnFactorial2.Enabled = true; lblTotalCalculations.Text = "TotalCalculations are " + Calculations.ToString(); } protected void AddTwoHandler(int Value, double Calculations) { lblAddTwo.Text = Value.ToString(); btnAddTwo.Enabled = true; lblTotalCalculations.Text = "TotalCalculations are " + Calculations.ToString(); } protected void LoopDoneHandler(double Calculations, int Count) { btnRunLoops.Enabled = true; lblRunLoops.Text = Count.ToString(); lblTotalCalculations.Text = "TotalCalculations are " + Calculations.ToString(); }

　　在 frmCalculations 的构造函数中，紧挨在 } 之前添加下列代码，以处理窗体将从 Calculator1 接收的自定义事件：

Calculator1.FactorialComplete += new Calculator.FactorialCompleteHandler(this.FactorialHandler); Calculator1.FactorialMinusOneComplete += new Calculator.FactorialCompleteHandler(this.FactorialMinusHandler); Calculator1.AddTwoComplete += new Calculator.AddTwoCompleteHandler(this.AddTwoHandler); Calculator1.LoopComplete += new Calculator.LoopCompleteHandler(this.LoopDoneHandler);