From c09f307a79759e8bd43881c818b2f4c5c82e1b75 Mon Sep 17 00:00:00 2001
From: lxmou666 <772765102@qq.com>
Date: Mon, 28 Dec 2020 17:38:42 +0800
Subject: [PATCH] 1

---
 .../TRTC/ViewModels/LiveWindowViewModel.cs    | 25 +++++++++++--------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/JianGongYun/TRTC/ViewModels/LiveWindowViewModel.cs b/JianGongYun/TRTC/ViewModels/LiveWindowViewModel.cs
index 7acbadc..0b72bea 100644
--- a/JianGongYun/TRTC/ViewModels/LiveWindowViewModel.cs
+++ b/JianGongYun/TRTC/ViewModels/LiveWindowViewModel.cs
@@ -178,9 +178,11 @@ namespace JianGongYun.TRTC.ViewModels
             }
         }
 
+
+        static object ScreenListLock = new object();
         private SIZE thumbSize = new SIZE { cx = 300, cy = 200 };
         private SIZE iconSize = new SIZE { cx = 50, cy = 50 };
-        private ObservableCollection<TRTCScreenEntity> _LiveScreens = new ObservableCollection<TRTCScreenEntity>();
+        private ObservableCollection<TRTCScreenEntity> _LiveScreens;
         /// <summary>
         /// 可分享桌面
         /// </summary>
@@ -188,17 +190,20 @@ namespace JianGongYun.TRTC.ViewModels
         {
             get
             {
-                _LiveScreens.Clear();
-                var temp = LiveClassroom.lTRTCCloud.getScreenCaptureSources(ref thumbSize, ref iconSize);
-                var count = temp.getCount();
-                for (uint i = 0; i < count; i++)
+                lock (ScreenListLock)
                 {
-                    var info = temp.getSourceInfo(i);
-                    //var icon = Util.ToWriteableBitmap(ref info.iconBGRA);
-                    var thumb = info.thumbBGRA.ToWriteableBitmap();
-                    _LiveScreens.Add(new TRTCScreenEntity { SourceId = info.sourceId, SourceName = info.sourceName, Type = info.type, Thumb = thumb, Info = info });
+                    _LiveScreens.Clear();
+                    var temp = LiveClassroom.lTRTCCloud.getScreenCaptureSources(ref thumbSize, ref iconSize);
+                    var count = temp.getCount();
+                    for (uint i = 0; i < count; i++)
+                    {
+                        var info = temp.getSourceInfo(i);
+                        //var icon = Util.ToWriteableBitmap(ref info.iconBGRA);
+                        var thumb = info.thumbBGRA.ToWriteableBitmap();
+                        _LiveScreens.Add(new TRTCScreenEntity { SourceId = info.sourceId, SourceName = info.sourceName, Type = info.type, Thumb = thumb, Info = info });
+                    }
+                    temp.release();
                 }
-                temp.release();
                 return _LiveScreens;
             }
         }