一般来说子线程都是用来处理数据的，主窗体用来实现展现，但是有些时候我们希望子窗体实现等待效果，遮挡主窗体并使主窗体逻辑正常进行，这个业务需求虽然不多，但是正好我们用到了，于是我打算把研究成果写在这了。稍后我会上传我的代码，包含测试程序以及之前两边博文谈到的控件，这里我还实现了一个类似雷达扫描的等待窗体，大家可以稍后查看。
实际上这里只有两个难点需要处理，一个就是如何让子窗体遮挡主窗体并位于主窗体中间，另一个就是委托及跨线程访问UI界面。为了方便调用，我在这里写了一个静态的子线程窗体管理类DialogWindowsManager。
1.遮挡主窗体
大家都知道，showDialog方法就是最好的遮挡效果，但是由于它是线程阻塞的，因此每当我们想到这里的时候会有一个误区，认为调用showDialog一定会阻塞前台界面，其实这里的阻塞只是阻塞调用方法所在的线程，并不是一定会阻塞主线程，因此在子线程中调用showDialog方法即可达到效果。实际测试时发现遮挡效果确实有了，可惜每次showDialog的时候窗体会满屏幕乱飞，好吧，最好的方法当然是设置onwer，不过我一直没尝试成功，因为主窗体与子窗体一直处于两个线程中，最后我通过一个算法将位置计算出来之后赋值给了子窗体。代码如下：
/// <summary>
/// 打开等待窗体线程
/// </summary>
public static void ShowWaitingForm(Window onwer) {
double[] d = new double[];
d[] = onwer.Top + onwer.Height / - ;
d[] = onwer.Left + onwer.Width / - ;
if (WaitingFormThread == null)
{
WaitingFormThread = new Thread(new ParameterizedThreadStart(showWaitingForm));
WaitingFormThread.SetApartmentState(ApartmentState.STA);
WaitingFormThread.Start(d);
}
else {
CloseWaitingForm();
ShowWaitingForm(onwer);
}
}
2.跨线程访问
这里不得不说WPF还是很给力的，因为它提供了Dispatcher来获取当前要更新的线程，这里网上资料很多，我就不多做解释了，直接上代码：
/// <summary>
/// 设置进度条百分比
/// </summary>
/// <param name="d">百分比</param>
public static void setProgrssFormPercent(double d) {
if (cf != null) {
cf.Dispatcher.BeginInvoke(new Action(() => { if (cf != null) { cf.setPercent(d); } }));
Thread.Sleep();
}
}
3.注意事项
子线程也是UI线程，因此线程一定要设置为ApartmentState.STA状态。
完成的线程管理代码如下：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Windows; namespace MyUserControlLibrary
{
public static class DialogWindowsManager
{
#region 属性 /// <summary>
/// 等待窗体处理线程
/// </summary>
static Thread WaitingFormThread;
/// <summary>
/// 进度条进程
/// </summary>
static Thread CircleProgressFormThread; /// <summary>
/// 等待进度条进程
/// </summary>
static Thread WaitingAndProgressFormThread; /// <summary>
/// 进度条窗体
/// </summary>
static CircleProgressForm cf;
/// <summary>
/// 等待进度条
/// </summary>
static WaitingAndProgressForm wpf;
#endregion #region 私有方法 /// <summary>
/// 打开等待窗体方法
/// </summary>
private static void showWaitingForm(object o)
{
double[] d = (double[])o;
WaitingForm wf = new WaitingForm();
wf.WindowStartupLocation = WindowStartupLocation.Manual;
wf.Top = d[];
wf.Left = d[];
wf.ShowDialog();
} /// <summary>
/// 打开进度条窗体方法
/// </summary>
/// <param name="o">显示位置集合 double[] 0-Top 1-Left</param>
private static void showCircleProgressForm(object o)
{
double[] d = (double[])o;
cf = new CircleProgressForm();
cf.WindowStartupLocation = WindowStartupLocation.Manual;
cf.Top = d[];
cf.Left = d[];
cf.ShowDialog();
} /// <summary>
/// 打开进度条窗体方法
/// </summary>
/// <param name="o">显示位置集合 double[] 0-Top 1-Left</param>
private static void showWaitingAndProgressForm(object o)
{
object[] m = (object[])o;
double[] d = (double[])m[];
wpf = new WaitingAndProgressForm();
wpf.MainControl.ShowType = (WaitAndProgressType)m[];
wpf.WindowStartupLocation = WindowStartupLocation.Manual;
wpf.Top = d[];
wpf.Left = d[];
wpf.ShowDialog();
} #endregion #region 公有方法 /// <summary>
/// 打开等待窗体线程
/// </summary>
public static void ShowWaitingForm(Window onwer) {
double[] d = new double[];
d[] = onwer.Top + onwer.Height / - ;
d[] = onwer.Left + onwer.Width / - ;
if (WaitingFormThread == null)
{
WaitingFormThread = new Thread(new ParameterizedThreadStart(showWaitingForm));
WaitingFormThread.SetApartmentState(ApartmentState.STA);
WaitingFormThread.Start(d);
}
else {
CloseWaitingForm();
ShowWaitingForm(onwer);
}
} /// <summary>
/// 关闭等待窗体线程
/// </summary>
public static void CloseWaitingForm()
{
WaitingFormThread.Abort();
WaitingFormThread.Join();
WaitingFormThread.DisableComObjectEagerCleanup();
WaitingFormThread = null;
} /// <summary>
/// 打开进度条窗体线程
/// </summary>
public static void ShowCircleProgressForm(Window onwer)
{
double[] d = new double[];
d[] = onwer.Top + onwer.Height / - ;
d[] = onwer.Left + onwer.Width / - ;
if (CircleProgressFormThread == null)
{
CircleProgressFormThread = new Thread(new ParameterizedThreadStart(showCircleProgressForm));
CircleProgressFormThread.SetApartmentState(ApartmentState.STA);
CircleProgressFormThread.Start(d);
Thread.Sleep();
}
else
{
CloseCircleProgressForm();
ShowCircleProgressForm(onwer);
}
} /// <summary>
/// 设置进度条百分比
/// </summary>
/// <param name="d">百分比</param>
public static void setProgrssFormPercent(double d) {
if (cf != null) {
cf.Dispatcher.BeginInvoke(new Action(() => { if (cf != null) { cf.setPercent(d); } }));
Thread.Sleep();
}
} /// <summary>
/// 关闭进度条窗体线程
/// </summary>
public static void CloseCircleProgressForm()
{
CircleProgressFormThread.Abort();
CircleProgressFormThread.Join();
CircleProgressFormThread.DisableComObjectEagerCleanup();
CircleProgressFormThread = null;
cf = null;
} /// <summary>
/// 打开等待进度条窗体线程
/// </summary>
public static void ShowWaitingAndProgressForm(Window onwer,WaitAndProgressType t)
{
object[] o = new object[];
double[] d = new double[];
d[] = onwer.Top + onwer.Height / - ;
d[] = onwer.Left + onwer.Width / - ;
o[] = d;
o[] = t;
if (WaitingAndProgressFormThread == null)
{
WaitingAndProgressFormThread = new Thread(new ParameterizedThreadStart(showWaitingAndProgressForm));
WaitingAndProgressFormThread.SetApartmentState(ApartmentState.STA);
WaitingAndProgressFormThread.Start(o);
Thread.Sleep();
}
else
{
CloseWaitingAndProgressForm();
ShowWaitingAndProgressForm(onwer,t);
}
} /// <summary>
/// 设置进度条百分比
/// </summary>
/// <param name="d">百分比</param>
public static void setWaitingAndProgressFormPercent(double d)
{
if (wpf != null)
{
wpf.Dispatcher.BeginInvoke(new Action(() => { if (wpf != null) { wpf.setPercent(d); } }));
Thread.Sleep();
}
} /// <summary>
/// 关闭等待进度条窗体线程
/// </summary>
public static void CloseWaitingAndProgressForm()
{
WaitingAndProgressFormThread.Abort();
WaitingAndProgressFormThread.Join();
WaitingAndProgressFormThread.DisableComObjectEagerCleanup();
WaitingAndProgressFormThread = null;
wpf = null;
} #endregion
}
}
整个解决方案我会上传的！！
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源码下载地址：http://files.cnblogs.com/files/lgmbk/UserControlTest.zip