使用 Visual C# 创作简单的多线程组件

1. 
   

   创建新的“Windows 应用程序”项目。

   
   


2. 
   

   将应用程序命名为 Calculations，将 Form1.cs 重命名为 frmCalculations.cs。

   
   


3. 
   

   向窗体中添加五个 Label 控件、四个 Button 控件和一个 TextBox 控件。

   
   

label 名依次. lblFactorial1、lblFactorial2、lblAddTwo、lblRunLoops、lblTotalCalculations.  text为空.

button 名依次.btnFactorial1、btnFactorial2 、btnAddTwo、btnRunLoops. text为Factorial 、Factorial - 1、Add Two 、Run a Loop .

textBox1名:txtValue.  text为空.

 

创建 Calculator 组件

1. 
   

   从“项目”菜单中选择“添加组件”。

   
   


2. 
   

   将组件命名为 Calculator。

   
   

Calculator.cs 代码:

 using System;<br />using System.Collections.Generic;<br />using System.ComponentModel;<br />using System.Diagnostics;<br />using System.Linq;<br />using System.Text;<br /><br />namespace Calculations<br />{<br /> public partial class Calculator : Component<br /> {<br /> // Declares the variables you will use to hold your thread objects.<br /> public System.Threading.Thread FactorialThread;<br /> public System.Threading.Thread FactorialMinusOneThread;<br /> public System.Threading.Thread AddTwoThread;<br /> public System.Threading.Thread LoopThread;<br /><br /> public int varAddTwo;<br /> public int varFact1;<br /> public int varFact2;<br /> public int varLoopValue;<br /> public double varTotalCalculations = 0;<br /><br /> // This delegate will be invoked with two of your events.<br /> public delegate void FactorialCompleteHandler(double Factorial, double TotalCalculations);<br /> public delegate void AddTwoCompleteHandler(int Result, double TotalCalculations);<br /> public delegate void LoopCompleteHandler(double TotalCalculations, int Counter);<br /><br /> public event FactorialCompleteHandler FactorialComplete;<br /> public event FactorialCompleteHandler FactorialMinusOneComplete;<br /> public event AddTwoCompleteHandler AddTwoComplete;<br /> public event LoopCompleteHandler LoopComplete;<br /><br /> public void FactorialMinusOne()<br /> {<br /> double varTotalAsOfNow = 0;<br /> double varResult = 1;<br /> // Performs a factorial calculation on varFact2 - 1.<br /> for (int varX = 1; varX <= varFact2 - 1; varX++)<br /> {<br /> varResult *= varX;<br /> // Increments varTotalCalculations and keeps track of the current <br /> // total as of this instant.<br /> lock (this)<br /> {<br /> varTotalCalculations += 1;<br /> varTotalAsOfNow = varTotalCalculations;<br /> }<br /> }<br /> // Signals that the method has completed, and communicates the <br /> // result and a value of total calculations performed up to this <br /> // point.<br /> FactorialMinusOneComplete(varResult, varTotalAsOfNow);<br /> }<br /><br /> // This method will calculate the value of a number factorial.<br /> // (varFact1!)<br /> public void Factorial()<br /> {<br /> double varResult = 1;<br /> double varTotalAsOfNow = 0;<br /> for (int varX = 1; varX <= varFact1; varX++)<br /> {<br /> varResult *= varX;<br /> lock (this)<br /> {<br /> varTotalCalculations += 1;<br /> varTotalAsOfNow = varTotalCalculations;<br /> }<br /> }<br /> FactorialComplete(varResult, varTotalAsOfNow);<br /> }<br /><br /> // This method will add two to a number (varAddTwo+2).<br /> public void AddTwo()<br /> {<br /> double varTotalAsOfNow = 0;<br /> int varResult = varAddTwo + 2;<br /> lock (this)<br /> {<br /> varTotalCalculations += 1;<br /> varTotalAsOfNow = varTotalCalculations;<br /> }<br /> AddTwoComplete(varResult, varTotalAsOfNow);<br /> }<br /><br /> // This method will run a loop with a nested loop varLoopValue times.<br /> public void RunALoop()<br /> {<br /> int varX;<br /> double varTotalAsOfNow = 0;<br /> for (varX = 1; varX <= varLoopValue; varX++)<br /> {<br /> // This nested loop is added solely for the purpose of slowing down<br /> // the program and creating a processor-intensive application.<br /> for (int varY = 1; varY <= 500; varY++)<br /> {<br /> lock (this)<br /> {<br /> varTotalCalculations += 1;<br /> varTotalAsOfNow = varTotalCalculations;<br /> }<br /> }<br /> }<br /> LoopComplete(varTotalAsOfNow, varLoopValue);<br /> }<br /><br /> public Calculator()<br /> {<br /> InitializeComponent();<br /> }<br /><br /> public Calculator(IContainer container)<br /> {<br /> container.Add(this);<br /><br /> InitializeComponent();<br /> }<br /><br /> public void ChooseThreads(int threadNumber)<br /> {<br /> // Determines which thread to start based on the value it receives.<br /> switch (threadNumber)<br /> {<br /> case 1:<br /> // Sets the thread using the AddressOf the subroutine where<br /> // the thread will start.<br /> FactorialThread = new System.Threading.Thread(new<br /> System.Threading.ThreadStart(this.Factorial));<br /> // Starts the thread.<br /> FactorialThread.Start();<br /> break;<br /> case 2:<br /> FactorialMinusOneThread = new<br /> System.Threading.Thread(new<br /> System.Threading.ThreadStart(this.FactorialMinusOne));<br /> FactorialMinusOneThread.Start();<br /> break;<br /> case 3:<br /> AddTwoThread = new System.Threading.Thread(new<br /> System.Threading.ThreadStart(this.AddTwo));<br /> AddTwoThread.Start();<br /> break;<br /> case 4:<br /> LoopThread = new System.Threading.Thread(new<br /> System.Threading.ThreadStart(this.RunALoop));<br /> LoopThread.Start();<br /> break;<br /> }<br /> }<br /> }<br />}<br />

 

frmCalculations.cs代码:

using System;<br />using System.Collections.Generic;<br />using System.ComponentModel;<br />using System.Data;<br />using System.Drawing;<br />using System.Linq;<br />using System.Text;<br />using System.Windows.Forms;<br /><br />namespace Calculations<br />{<br /> public partial class frmCalculations : Form<br /> {<br /> Calculator Calculator1;<br /><br /> public delegate void FHandler(double Value, double Calculations);<br /> public delegate void A2Handler(int Value, double Calculations);<br /> public delegate void LDHandler(double Calculations, int Count);<br /><br /> public frmCalculations()<br /> {<br /> InitializeComponent();<br /><br /> // Creates a new instance of Calculator.<br /> Calculator1 = new Calculator();<br /><br /> Calculator1.FactorialComplete += new<br /> Calculator.FactorialCompleteHandler(this.FactorialHandler);<br /> Calculator1.FactorialMinusOneComplete += new<br /> Calculator.FactorialCompleteHandler(this.FactorialMinusHandler);<br /> Calculator1.AddTwoComplete += new<br /> Calculator.AddTwoCompleteHandler(this.AddTwoHandler);<br /> Calculator1.LoopComplete += new<br /> Calculator.LoopCompleteHandler(this.LoopDoneHandler);<br /> }<br /><br /> private void btnFactorial1_Click(object sender, EventArgs e)<br /> {<br /> Calculator1.varFact1 = int.Parse(txtValue.Text);<br /> // Disables the btnFactorial1 until this calculation is complete.<br /> btnFactorial1.Enabled = false; <br /> // Passes the value 1 to Calculator1, thus directing it to start the <br /> // correct thread.<br /> Calculator1.ChooseThreads(1);<br /> }<br /><br /> private void btnFactorial2_Click(object sender, EventArgs e)<br /> {<br /> Calculator1.varFact2 = int.Parse(txtValue.Text);<br /> btnFactorial2.Enabled = false; <br /> // Passes the value 1 to Calculator1, thus directing it to start the <br /> // correct thread.<br /> Calculator1.ChooseThreads(2);<br /> }<br /><br /> private void btnAddTwo_Click(object sender, EventArgs e)<br /> {<br /> Calculator1.varAddTwo = int.Parse(txtValue.Text);<br /> btnAddTwo.Enabled = false; <br /> // Passes the value 1 to Calculator1, thus directing it to start the <br /> // correct thread.<br /> Calculator1.ChooseThreads(3);<br /> }<br /><br /> private void btnRunLoops_Click(object sender, EventArgs e)<br /> {<br /> Calculator1.varLoopValue = int.Parse(txtValue.Text);<br /> btnRunLoops.Enabled = false;<br /> // Lets the user know that a loop is running<br /> lblRunLoops.Text = "Looping"; <br /> // Passes the value 1 to Calculator1, thus directing it to start the <br /> // correct thread.<br /> Calculator1.ChooseThreads(4);<br /> }<br /><br /> private void FactorialHandler(double Value, double Calculations)<br /> // Displays the returned value in the appropriate label.<br /> {<br /> // BeginInvoke causes asynchronous execution to begin at the address<br /> // specified by the delegate. Simply put, it transfers execution of <br /> // this method back to the main thread. Any parameters required by <br /> // the method contained at the delegate are wrapped in an object and <br /> // passed. <br /> this.BeginInvoke(new FHandler(FactHandler), new Object[] { Value, Calculations });<br /> }<br /><br /> private void FactorialMinusHandler(double Value, double Calculations)<br /> {<br /> this.BeginInvoke(new FHandler(Fact1Handler), new Object[] { Value, Calculations });<br /> }<br /><br /> private void AddTwoHandler(int Value, double Calculations)<br /> {<br /> this.BeginInvoke(new A2Handler(Add2Handler), new Object[] { Value, Calculations });<br /> }<br /><br /> private void LoopDoneHandler(double Calculations, int Count)<br /> {<br /> this.BeginInvoke(new LDHandler(LDoneHandler), new Object[] { Calculations, Count });<br /> }<br /><br /> public void FactHandler(double Value, double Calculations)<br /> {<br /> lblFactorial1.Text = Value.ToString();<br /> // Re-enables the button so it can be used again.<br /> btnFactorial1.Enabled = true;<br /> // Updates the label that displays the total calculations performed<br /> lblTotalCalculations.Text = "TotalCalculations are " + Calculations.ToString();<br /> }<br /> public void Fact1Handler(double Value, double Calculations)<br /> {<br /> lblFactorial2.Text = Value.ToString();<br /> btnFactorial2.Enabled = true;<br /> lblTotalCalculations.Text = "TotalCalculations are " + Calculations.ToString();<br /> }<br /> public void Add2Handler(int Value, double Calculations)<br /> {<br /> lblAddTwo.Text = Value.ToString();<br /> btnAddTwo.Enabled = true;<br /> lblTotalCalculations.Text = "TotalCalculations are " + Calculations.ToString();<br /> }<br /> public void LDoneHandler(double Calculations, int Count)<br /> {<br /> btnRunLoops.Enabled = true;<br /> lblRunLoops.Text = Count.ToString();<br /> lblTotalCalculations.Text = "TotalCalculations are " + Calculations.ToString();<br /> }<br /> }<br />}