一般在做WinForm应用时会遇到较长时间的用户操作等待,此时最好加个等待窗口,给用户一个良好的操作体验.
太懒本来想在网上找一个代码的,但没找到合适的,只能自己动手写一个了,附上代码,也给自己做个备份
包括一个private的内建等待窗口类,及一个public的WaitForm类
WaitForm类提供Show及Close两个方法,代码中等待窗口不为模式窗口
在应用中需要操作长时间运作时可用下面的模式调用:
WaitForm.Show(this);//显示等待窗口
DoSomthing();//主窗口长时间操作
WaitForm.Close();//关闭等待窗口
这段代码主要应用了多线程方式完成,使用一个AutoResetEvent事件信号量来做窗口状态处理,并增保证了等待窗口在异常关闭的情况下能正确的退出显示线程.
Codeusing System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;
namespace BMSAP.Windows
{
class FrmWait : Form
{
/// <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.label1 = new System.Windows.Forms.Label();
this.SuspendLayout();
//
// label1
//
this.label1.Dock = System.Windows.Forms.DockStyle.Fill;
this.label1.Font = new System.Drawing.Font("Microsoft YaHei", 18F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.label1.Location = new System.Drawing.Point(0, 0);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(386, 60);
this.label1.TabIndex = 0;
this.label1.Text = "正 在 处 理 请 稍 候 ";
this.label1.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
//
// FrmWait
//
this.AutoScaleDimensions = new System.Drawing.SizeF(7F, 17F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(386, 60);
this.ControlBox = false;
this.Controls.Add(this.label1);
this.Font = new System.Drawing.Font("Microsoft YaHei", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
this.Margin = new System.Windows.Forms.Padding(4, 4, 4, 4);
this.Name = "FrmWait";
this.ShowIcon = false;
this.ShowInTaskbar = false;
this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
this.ResumeLayout(false);
}
#endregion
private System.Windows.Forms.Label label1;
public FrmWait()
{
InitializeComponent();
}
}
public delegate void ExecutedInvokeHeandle();
/// <summary>
/// 等待窗口
/// </summary>
public class WaitForm
{
/// <summary>
/// 等待窗口对象
/// </summary>
static FrmWait mWait;
/// <summary>
/// 事件状态通知
/// </summary>
static AutoResetEvent mEvents;
/// <summary>
/// 显示状态
/// </summary>
static bool mShowing = false;
/// <summary>
/// 等待状态
/// </summary>
static bool mWaiting = false;
static WaitForm()
{
//全局等待信号
mEvents = new AutoResetEvent(false);
}
/// <summary>
/// 窗口关闭事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
static void WaitForm_FormClosed(object sender, FormClosedEventArgs e)
{
if (mWaiting || !(sender is FrmWait))
{
//信号等待中被异常关闭,或主窗口被关闭时自动通知信号复位
mEvents.Set();
return;
}
mShowing = false;
//回收等待窗口
try
{
mWait.Dispose();
}
finally
{
mWait = null;
}
}
/// <summary>
/// 显示等待窗口
/// </summary>
/// <param name="pComponet">调用对象,可为控件或窗口</param>
public static void Show(Control pComponet)
{
//已显示则返回
if (mShowing)
return;
//创建等待窗口
mWait = new FrmWait();
//设置窗口关闭事件
mWait.FormClosed += new FormClosedEventHandler(WaitForm_FormClosed);
//启动显示线程
Thread tmpThread = new Thread(show);
tmpThread.Start(pComponet);
}
/// <summary>
/// 关闭等待窗口
/// </summary>
public static void Close()
{
if (mShowing)
//如果显示中则设置关闭信号
mEvents.Set();
//修改等待状态
mWaiting = false;
}
/// <summary>
/// 显示窗口过程
/// </summary>
/// <param name="pComponet"></param>
static void show(object pComponet)
{
if (pComponet != null &&
pComponet is Control)
{
//设置显示状态
mShowing = true;
//当调用对象为Win控件时
(pComponet as Control).BeginInvoke(new ExecutedInvokeHeandle(delegate()
{
//进行异步调用
if (pComponet != null &&
pComponet is Control)
{
//显示等待窗口
mWait.Show((pComponet as Control).FindForm());
//设置父级窗口关闭事件
(pComponet as Control).FindForm().FormClosed += new FormClosedEventHandler(WaitForm_FormClosed);
//激活父级窗口,
(pComponet as Control).FindForm().Activate();
}
else
{
//如查询不到父级窗口设置顶层显示,此处可用GetDesktop的API来获取桌面窗口,并设置为父级窗口
mWait.TopMost = true;
//显示等待窗口
mWait.Show();
}
}));
//设置等待信号
mWaiting = true;
mEvents.WaitOne();
//等待结束
mWaiting = false;
(pComponet as Control).BeginInvoke(new ExecutedInvokeHeandle(delegate()
{
//关闭窗口
mWait.Close();
}));
}
}
}
}
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