C# wimform 实现等待窗口
C#想实现下面的功能：
在后台处理一个较复杂的操作的时候出现弹出的等待对话框，避免前台界面无反应，当处理完成后该对话框自动关闭。
要想实现该如何处理？
[解决办法]
使用BackGroundWorker控件
[解决办法]
- C# code
//主窗体public partial class DelegateBeginInvoke : Form { public DelegateBeginInvoke() { InitializeComponent(); } //定义与方法同签名的委托 private delegate string DelegateName(int num, out int ret); private delegate void DelegateA(); private delegate void Delegate赋值(string 值); formTimer f = new formTimer(); //要进行异步的方法 private string MethodName(int num, out int ret) { ret = num; System.Threading.Thread.Sleep(10000); return "HelloWorld"; } private void button1_Click(object sender, EventArgs e) { label1.Text = ""; //实例化委托并初赋值 DelegateName dn = new DelegateName(MethodName); int i; //实例化回调函数，把AsyncCallback看成是Delegate就懂了，实际上AsyncCallback是一种特殊的Delegate AsyncCallback acb = new AsyncCallback(CallBackMethod); //异步开始 //如果参数acb换成null则表示没有回调方法 //最后一个参数dn的地方，可以换成任意对象，该对象可以被回调方法从参数中获取出来，写成null也可以。 //参数dn相当于该线程的ID，如果有多个异步线程，可以都是null，但是绝对不能一样，不能是同一个object，否则异常 IAsyncResult iar = dn.BeginInvoke(1, out i, acb, dn); textBox1.Text = Environment.UserName.ToString(); f = new formTimer(); f.Show(); } //回调方法(异步完成时，执行的方法，此方法只有IAsyncResult一个参数，但是该参数几乎万能，可以传递Object) private void CallBackMethod(IAsyncResult ar) { DelegateName dn = (DelegateName)ar.AsyncState; int i; string r = dn.EndInvoke(out i, ar);//一定要EndInvoke，否则你的下场很惨 DelegateA dd = new DelegateA(formClose); if (f.InvokeRequired) this.Invoke(dd); else formClose(); //MessageBox.Show("异步完成了！i的值是" + i.ToString() + ",r的值是" + r); Delegate赋值 dd赋值 = new Delegate赋值(赋值); if (label1.InvokeRequired) { this.Invoke(dd赋值, new object[] { "异步完成了！i的值是" + i.ToString() + ",r的值是" + r }); } else { textBox1.Text = "异步完成了！i的值是" + i.ToString() + ",r的值是" + r; } } void formClose() { f.Close(); } void 赋值(string aa) { label1.Text = aa; } }
[解决办法]
- C# code
//弹出的提示窗体 public partial class formTimer : Form { public formTimer() { InitializeComponent(); } DateTime a = DateTime.Now; private void formTimer_Load(object sender, EventArgs e) { label1.Text = (DateTime.Now - a).Seconds.ToString(); timer1.Enabled = true; } private void timer1_Tick(object sender, EventArgs e) { label1.Text = (DateTime.Now - a).Seconds.ToString(); } }//弹出窗体的designer.cs文件 用于构建界面友好 partial class formTimer { /// <summary> /// Required designer variable. /// </summary> private System.ComponentModel.IContainer components = null; /// <summary> /// Clean up any resources being used. /// </summary> /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param> protected override void Dispose(bool disposing) { if (disposing && (components != null)) { components.Dispose(); } base.Dispose(disposing); } #region Windows Form Designer generated code /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent() { this.components = new System.ComponentModel.Container(); this.timer1 = new System.Windows.Forms.Timer(this.components); this.panel1 = new System.Windows.Forms.Panel(); this.label1 = new System.Windows.Forms.Label(); this.panel1.SuspendLayout(); this.SuspendLayout(); // // timer1 // this.timer1.Interval = 1000; this.timer1.Tick += new System.EventHandler(this.timer1_Tick); // // panel1 // this.panel1.BackColor = System.Drawing.Color.Transparent; this.panel1.Controls.Add(this.label1); this.panel1.Dock = System.Windows.Forms.DockStyle.Fill; this.panel1.Location = new System.Drawing.Point(0, 0); this.panel1.Name = "panel1"; this.panel1.Size = new System.Drawing.Size(121, 66); this.panel1.TabIndex = 0; // // label1 // this.label1.AutoSize = true; this.label1.BackColor = System.Drawing.Color.Transparent; this.label1.Dock = System.Windows.Forms.DockStyle.Fill; this.label1.Font = new System.Drawing.Font("SimSun", 30F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134))); this.label1.ForeColor = System.Drawing.Color.Red; this.label1.Location = new System.Drawing.Point(0, 0); this.label1.Name = "label1"; this.label1.Size = new System.Drawing.Size(0, 40); this.label1.TabIndex = 0; // // formTimer // this.BackColor = System.Drawing.Color.White; this.ClientSize = new System.Drawing.Size(121, 66); this.Controls.Add(this.panel1); this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None; this.MaximizeBox = false; this.MinimizeBox = false; this.Name = "formTimer"; this.ShowInTaskbar = false; this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen; this.TopMost = true; this.TransparencyKey = System.Drawing.SystemColors.ControlText; this.Load += new System.EventHandler(this.formTimer_Load); this.panel1.ResumeLayout(false); this.panel1.PerformLayout(); this.ResumeLayout(false); } #endregion private System.Windows.Forms.Timer timer1; private System.Windows.Forms.Panel panel1; private System.Windows.Forms.Label label1;
[解决办法]
- C# code
//写了一个backgroundWorker例子 //主界面拖一个backgroundWorker组件 public partial class Form1 : Form { public Form1() { InitializeComponent(); this.backgroundWorker1.DoWork += new System.ComponentModel.DoWorkEventHandler(this.backgroundWorker1_DoWork); this.backgroundWorker1.RunWorkerCompleted += new System.ComponentModel.RunWorkerCompletedEventHandler(this.backgroundWorker1_RunWorkerCompleted); } private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e) { WaitMethod(); } private void WaitMethod() { //模拟等待操作 Thread.Sleep(5000); //这里不能使用界面控件 //如果要使用,要委托和this.Invoke() } private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) { if (_WaitForm != null && !_WaitForm.IsDisposed) { _WaitForm.Close(); } } //开始 ProgressBarFrom _WaitForm = null; private void button1_Click(object sender, EventArgs e) { if (!backgroundWorker1.IsBusy) { backgroundWorker1.RunWorkerAsync(); } _WaitForm = new ProgressBarFrom(); _WaitForm.Show(); } } //ProgressBarFrom 窗体只需要拉一个 ProgressBar控件,Style设置为:Marquee