[英]How to access a WinForms control from another thread i.e. synchronize with the GUI thread?
我正在开发 C# winforms 应用程序,我需要知道如何通过更改复选框值将代码操作到线程中。
new Thread(() =>
{
Thread.CurrentThread.IsBackground = true;
TcpListener server = null;
while (true)
{
if(){}else{}// here I need to check my checkbox
}}).Start();
你可以使用这个:
new Thread(() =>
{
Thread.CurrentThread.IsBackground = true;
TcpListener server = null;
while (true)
{
...
this.SynUI(()=>
{
if ( checkbox.Checked )
{
}
});
...
}
}).Start();
或者:
...
bool checked = false;
this.SynUI(()=> { checked = checkbox.Checked; });
...
有:
static public class SyncUIHelper
{
static public Thread MainThread { get; private set; }
// Must be called from the Program.Main or the Main Form constructor for example
static public void Initialize()
{
MainThread = Thread.CurrentThread;
}
static public void SyncUI(this Control control, Action action, bool wait = true)
{
if ( !Thread.CurrentThread.IsAlive ) throw new ThreadStateException();
Exception exception = null;
Semaphore semaphore = null;
Action processAction = () =>
{
try { action(); }
catch ( Exception except ) { exception = except; }
};
Action processActionWait = () =>
{
processAction();
if ( semaphore != null ) semaphore.Release();
};
if ( control != null
&& control.InvokeRequired
&& Thread.CurrentThread != MainThread )
{
if ( wait ) semaphore = new Semaphore(0, 1);
control.BeginInvoke(wait ? processActionWait : processAction);
if ( semaphore != null ) semaphore.WaitOne();
}
else
processAction();
if ( exception != null ) throw exception;
}
}
在 Application.Run 之前添加 Program.Main:
SyncUIHelper.Initialize();
您可以在堆栈溢出中找到各种将线程与 UI 线程同步的方法,例如:
也有 BackgroundWorker。
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