"调用线程必须是STA,因为许多UI组件都需要这个." WPF

Question

我遇到一个InvalidOperationException,消息"调用线程必须是STA,因为许多UI组件都需要这个." 在WPF应用程序中,严重依赖于引用的库.

我试图确定错误的来源,使用各种线程和对象的调度程序,确保main()具有STAthread属性,尝试在看似相关的方法上设置"[STAThread]".

在MyParticipant构造函数中,正在构建MyVideoRenderer pic,它继承了VideoRenderer,VideoRenderer构造函数本身就抛出了这个异常,而没有进入构造函数.

码:

public class MyParticipant : Participant           //inside MainWindow.xaml.cs
    {
        public enum PictureMode
        {
            Avatar,
            Video
        }

        public PictureMode pictureMode = PictureMode.Avatar;

        public ProgressBar voiceVolume;
        public Label nameLabel;
        public MyVideoRenderer pic;
        public MyVideo video;

        public bool isCachedInClient = false;   
        public string displayName = null;
        public Image avatarImage = null;

        public static int picHeight = 480;
        public static int piclWidth = 640;
        public static int panelHeight = 155;
        public static int panelWidth = 174;

        public static Color liveColor = SystemColors.GradientActiveCaptionColor;
        public static Color nonLiveColor = SystemColors.GradientInactiveCaptionColor;


        public MyParticipant(uint objectId, VideoManager videoManager)
            : base(objectId, videoManager)
        {
            pic = new MyVideoRenderer(videoManagerRef)   
            {
                //Top = 5,
                //Left = 5,
                Height = picHeight,
                Width = piclWidth,
                //SizeMode = PictureBoxSizeMode.StretchImage
            };
...

public class VideoRenderer : System.Windows.Controls.Image         //referenced external class
{
    public VideoRenderer(VideoManagerRoot videoManager)        ///Exception here
    {
        this.videoManagerRef = videoManager;
    }
...

Answer 1

我的猜测是你从后台线程创建UI元素,这是异常的原因.

读:

• the-calling-thread-must-be-sta-because-many-ui-components-require-this-error,or
• 在-调用线程必须待STA-因为一对多的UI组件,需要,这