Use STA function from MTA in WinUI3

Hoka Biu 0
Viewed 48

My application need to use some COM objects in MTA (COM object will use UI element), so I defined my app as MTA:

[global::System.MTAThreadAttribute]
static void Main(string[] args)
{
    XamlCheckProcessRequirements();

    global::WinRT.ComWrappersSupport.InitializeComWrappers();
    global::Microsoft.UI.Xaml.Application.Start((p) =>
    {
       var context = new global::Microsoft.UI.Dispatching.DispatcherQueueSynchronizationContext(global::Microsoft.UI.Dispatching.DispatcherQueue.GetForCurrentThread());
                
       global::System.Threading.SynchronizationContext.SetSynchronizationContext(context);
                new App();
     });
}

However, after defining it, i cannot do a copy-paste action on any TextBox in app.

When I checked with Clipboard.SetContent(copyData); it throws an exception: Activating a single-threaded class from MTA is not supported

So, How can i solve this problem?

winui-3 c#
1 Answers

You can do it this way. Say your TextBox's name is TextBoxControl.

DataPackage dataPackage = new()
{
    RequestedOperation = DataPackageOperation.Copy
};

_ = this.TextControl.DispatcherQueue.TryEnqueue(() =>
{
    dataPackage.SetText(this.TextControl.Text);
    Clipboard.SetContent(dataPackage);
});
Andrew KeepCoding0
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