C# 窗体程序后台线程操做窗体控件
源码以下：编辑器
// For Method Two
public delegate void SetTextCallback(string text);
public partial class MainForm : Form
{
// For Method One
System.Threading.SynchronizationContext m_SyncContext = null;
// For Method Three
private BackgroundWorker m_Worker = null;
public MainForm()
{
InitializeComponent();
// For Method One
this.m_SyncContext = System.Threading.SynchronizationContext.Current;
// For Method Three
this.m_Worker = new System.ComponentModel.BackgroundWorker();
this.m_Worker.WorkerReportsProgress = true;
this.m_Worker.DoWork += new DoWorkEventHandler(Worker_DoWork);
this.m_Worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(Worker_RunWorkerCompleted);
// For Method Four
Control.CheckForIllegalCrossThreadCalls = false;
}
#region For Method One
private void btnStartThreadForMethodOne_Click(object sender, EventArgs e)
{
System.Threading.Thread th = new System.Threading.Thread(ThreadRunForMethodOne);
th.IsBackground = true;
th.Start();
}
private void ThreadRunForMethodOne()
{
m_SyncContext.Post(Post, "SynchronizationContext-Post.");
}
private void Post(object text)
{
this.txtDisplayForMethodOne.Text = text.ToString();
}
#endregion
#region For Method Two
private void btnStartThreadForMethodTwo_Click(object sender, EventArgs e)
{
System.Threading.Thread th = new System.Threading.Thread(ThreadRunForMethodTwo);
th.IsBackground = true;
th.Start();
}
private void ThreadRunForMethodTwo()
{
this.SetText("This text was set safely.");
}
private void SetText(string text)
{
if (this.txtDisplayForMethodTwo.InvokeRequired)
{
while (!this.txtDisplayForMethodOne.IsHandleCreated)
{
if (this.txtDisplayForMethodTwo.Disposing || this.txtDisplayForMethodOne.IsDisposed)
return;
}
this.txtDisplayForMethodTwo.Invoke(new SetTextCallback(SetText), new object[] { text });
}
else
{
this.txtDisplayForMethodTwo.Text = text;
}
}
#endregion
#region For Method Three
private void btnStartThreadForMethodThree_Click(object sender, EventArgs e)
{
if (!this.m_Worker.IsBusy)
{
this.m_Worker.RunWorkerAsync();
}
}
private void Worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
txtDisplayForMethodThree.Text = e.Result.ToString();
}
private void Worker_DoWork(object sender, DoWorkEventArgs e)
{
e.Result = "Update UI by using BackgroundWorker";
}
#endregion
#region For Method Four
private void btnStartThreadForMethodFour_Click(object sender, EventArgs e)
{
System.Threading.Thread th = new System.Threading.Thread(ThreadRunForMethodFour);
th.IsBackground = true;
th.Start();
}
private void ThreadRunForMethodFour()
{
txtDisplayForMethodFour.Text = "CheckForIllegalCrossThreadCalls = false";
}
#endregion
}
partial class MainForm
{
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// 清理全部正在使用的资源。
/// </summary>
/// <param name="disposing">若是应释放托管资源，为 true；不然为 false。</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要
/// 使用代码编辑器修改此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.groupBox1 = new System.Windows.Forms.GroupBox();
this.label1 = new System.Windows.Forms.Label();
this.btnStartThreadForMethodOne = new System.Windows.Forms.Button();
this.txtDisplayForMethodOne = new System.Windows.Forms.TextBox();
this.groupBox2 = new System.Windows.Forms.GroupBox();
this.label2 = new System.Windows.Forms.Label();
this.btnStartThreadForMethodTwo = new System.Windows.Forms.Button();
this.txtDisplayForMethodTwo = new System.Windows.Forms.TextBox();
this.groupBox3 = new System.Windows.Forms.GroupBox();
this.label3 = new System.Windows.Forms.Label();
this.btnStartThreadForMethodThree = new System.Windows.Forms.Button();
this.txtDisplayForMethodThree = new System.Windows.Forms.TextBox();
this.groupBox4 = new System.Windows.Forms.GroupBox();
this.label4 = new System.Windows.Forms.Label();
this.btnStartThreadForMethodFour = new System.Windows.Forms.Button();
this.txtDisplayForMethodFour = new System.Windows.Forms.TextBox();
this.groupBox1.SuspendLayout();
this.groupBox2.SuspendLayout();
this.groupBox3.SuspendLayout();
this.groupBox4.SuspendLayout();
this.SuspendLayout();
//
// groupBox1
//
this.groupBox1.Controls.Add(this.label1);
this.groupBox1.Controls.Add(this.btnStartThreadForMethodOne);
this.groupBox1.Controls.Add(this.txtDisplayForMethodOne);
this.groupBox1.Location = new System.Drawing.Point(12, 12);
this.groupBox1.Name = "groupBox1";
this.groupBox1.Size = new System.Drawing.Size(368, 132);
this.groupBox1.TabIndex = 0;
this.groupBox1.TabStop = false;
this.groupBox1.Text = "Method One";
//
// label1
//
this.label1.AutoSize = true;
this.label1.Location = new System.Drawing.Point(33, 29);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(173, 12);
this.label1.TabIndex = 2;
this.label1.Text = "Using SynchronizationContext";
//
// btnStartThreadForMethodOne
//
this.btnStartThreadForMethodOne.Location = new System.Drawing.Point(34, 80);
this.btnStartThreadForMethodOne.Name = "btnStartThreadForMethodOne";
this.btnStartThreadForMethodOne.Size = new System.Drawing.Size(304, 35);
this.btnStartThreadForMethodOne.TabIndex = 1;
this.btnStartThreadForMethodOne.Text = "启动线程";
this.btnStartThreadForMethodOne.UseVisualStyleBackColor = true;
this.btnStartThreadForMethodOne.Click += new System.EventHandler(this.btnStartThreadForMethodOne_Click);
//
// txtDisplayForMethodOne
//
this.txtDisplayForMethodOne.Location = new System.Drawing.Point(34, 53);
this.txtDisplayForMethodOne.Name = "txtDisplayForMethodOne";
this.txtDisplayForMethodOne.Size = new System.Drawing.Size(304, 21);
this.txtDisplayForMethodOne.TabIndex = 0;
//
// groupBox2
//
this.groupBox2.Controls.Add(this.label2);
this.groupBox2.Controls.Add(this.btnStartThreadForMethodTwo);
this.groupBox2.Controls.Add(this.txtDisplayForMethodTwo);
this.groupBox2.Location = new System.Drawing.Point(386, 12);
this.groupBox2.Name = "groupBox2";
this.groupBox2.Size = new System.Drawing.Size(368, 132);
this.groupBox2.TabIndex = 0;
this.groupBox2.TabStop = false;
this.groupBox2.Text = "Method Two";
//
// label2
//
this.label2.AutoSize = true;
this.label2.Location = new System.Drawing.Point(33, 29);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(155, 12);
this.label2.TabIndex = 2;
this.label2.Text = "Using Invoke/BegainInvoke";
//
// btnStartThreadForMethodTwo
//
this.btnStartThreadForMethodTwo.Location = new System.Drawing.Point(34, 80);
this.btnStartThreadForMethodTwo.Name = "btnStartThreadForMethodTwo";
this.btnStartThreadForMethodTwo.Size = new System.Drawing.Size(304, 35);
this.btnStartThreadForMethodTwo.TabIndex = 1;
this.btnStartThreadForMethodTwo.Text = "启动线程";
this.btnStartThreadForMethodTwo.UseVisualStyleBackColor = true;
this.btnStartThreadForMethodTwo.Click += new System.EventHandler(this.btnStartThreadForMethodTwo_Click);
//
// txtDisplayForMethodTwo
//
this.txtDisplayForMethodTwo.Location = new System.Drawing.Point(34, 53);
this.txtDisplayForMethodTwo.Name = "txtDisplayForMethodTwo";
this.txtDisplayForMethodTwo.Size = new System.Drawing.Size(304, 21);
this.txtDisplayForMethodTwo.TabIndex = 0;
//
// groupBox3
//
this.groupBox3.Controls.Add(this.label3);
this.groupBox3.Controls.Add(this.btnStartThreadForMethodThree);
this.groupBox3.Controls.Add(this.txtDisplayForMethodThree);
this.groupBox3.Location = new System.Drawing.Point(12, 166);
this.groupBox3.Name = "groupBox3";
this.groupBox3.Size = new System.Drawing.Size(368, 132);
this.groupBox3.TabIndex = 0;
this.groupBox3.TabStop = false;
this.groupBox3.Text = "Method Three";
//
// label3
//
this.label3.AutoSize = true;
this.label3.Location = new System.Drawing.Point(33, 29);
this.label3.Name = "label3";
this.label3.Size = new System.Drawing.Size(137, 12);
this.label3.TabIndex = 2;
this.label3.Text = "Using BackgroundWorker";
//
// btnStartThreadForMethodThree
//
this.btnStartThreadForMethodThree.Location = new System.Drawing.Point(34, 80);
this.btnStartThreadForMethodThree.Name = "btnStartThreadForMethodThree";
this.btnStartThreadForMethodThree.Size = new System.Drawing.Size(304, 35);
this.btnStartThreadForMethodThree.TabIndex = 1;
this.btnStartThreadForMethodThree.Text = "启动线程";
this.btnStartThreadForMethodThree.UseVisualStyleBackColor = true;
this.btnStartThreadForMethodThree.Click += new System.EventHandler(this.btnStartThreadForMethodThree_Click);
//
// txtDisplayForMethodThree
//
this.txtDisplayForMethodThree.Location = new System.Drawing.Point(34, 53);
this.txtDisplayForMethodThree.Name = "txtDisplayForMethodThree";
this.txtDisplayForMethodThree.Size = new System.Drawing.Size(304, 21);
this.txtDisplayForMethodThree.TabIndex = 0;
//
// groupBox4
//
this.groupBox4.Controls.Add(this.label4);
this.groupBox4.Controls.Add(this.btnStartThreadForMethodFour);
this.groupBox4.Controls.Add(this.txtDisplayForMethodFour);
this.groupBox4.Location = new System.Drawing.Point(386, 166);
this.groupBox4.Name = "groupBox4";
this.groupBox4.Size = new System.Drawing.Size(368, 132);
this.groupBox4.TabIndex = 0;
this.groupBox4.TabStop = false;
this.groupBox4.Text = "Method Four";
//
// label4
//
this.label4.AutoSize = true;
this.label4.Location = new System.Drawing.Point(33, 29);
this.label4.Name = "label4";
this.label4.Size = new System.Drawing.Size(173, 12);
this.label4.TabIndex = 2;
this.label4.Text = "Using Cancel Thread Crossing";
//
// btnStartThreadForMethodFour
//
this.btnStartThreadForMethodFour.Location = new System.Drawing.Point(34, 80);
this.btnStartThreadForMethodFour.Name = "btnStartThreadForMethodFour";
this.btnStartThreadForMethodFour.Size = new System.Drawing.Size(304, 35);
this.btnStartThreadForMethodFour.TabIndex = 1;
this.btnStartThreadForMethodFour.Text = "启动线程";
this.btnStartThreadForMethodFour.UseVisualStyleBackColor = true;
this.btnStartThreadForMethodFour.Click += new System.EventHandler(this.btnStartThreadForMethodFour_Click);
//
// txtDisplayForMethodFour
//
this.txtDisplayForMethodFour.Location = new System.Drawing.Point(34, 53);
this.txtDisplayForMethodFour.Name = "txtDisplayForMethodFour";
this.txtDisplayForMethodFour.Size = new System.Drawing.Size(304, 21);
this.txtDisplayForMethodFour.TabIndex = 0;
//
// MainForm
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(766, 316);
this.Controls.Add(this.groupBox4);
this.Controls.Add(this.groupBox3);
this.Controls.Add(this.groupBox2);
this.Controls.Add(this.groupBox1);
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;
this.Name = "MainForm";
this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
this.Text = "Four Motheds For Update UI In Background Thread";
this.groupBox1.ResumeLayout(false);
this.groupBox1.PerformLayout();
this.groupBox2.ResumeLayout(false);
this.groupBox2.PerformLayout();
this.groupBox3.ResumeLayout(false);
this.groupBox3.PerformLayout();
this.groupBox4.ResumeLayout(false);
this.groupBox4.PerformLayout();
this.ResumeLayout(false);
}
#endregion
private System.Windows.Forms.GroupBox groupBox1;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Button btnStartThreadForMethodOne;
private System.Windows.Forms.TextBox txtDisplayForMethodOne;
private System.Windows.Forms.GroupBox groupBox2;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.Button btnStartThreadForMethodTwo;
private System.Windows.Forms.TextBox txtDisplayForMethodTwo;
private System.Windows.Forms.GroupBox groupBox3;
private System.Windows.Forms.Label label3;
private System.Windows.Forms.Button btnStartThreadForMethodThree;
private System.Windows.Forms.TextBox txtDisplayForMethodThree;
private System.Windows.Forms.GroupBox groupBox4;
private System.Windows.Forms.Label label4;
private System.Windows.Forms.Button btnStartThreadForMethodFour;
private System.Windows.Forms.TextBox txtDisplayForMethodFour;
}