优化

Src/FrmMain.cs

@@ -256,14 +256,21 @@ namespace Kivii.Sample.ImageUploader
 
         private void connect(int selectedIndex = 0)
         {
-            if (videoDevice == null) return;
-            if ((videoCapabilities != null) && (videoCapabilities.Length != 0))
+            if (InvokeRequired)
+            {
+                Invoke(new Action<int>(connect), selectedIndex);
+            }
+            else
             {
-                videoDevice.VideoResolution = videoCapabilities[selectedIndex];
+                if (videoDevice == null) return;
+                if ((videoCapabilities != null) && (videoCapabilities.Length != 0))
+                {
+                    videoDevice.VideoResolution = videoCapabilities[selectedIndex];
+                }
+                vspCamView.VideoSource = videoDevice;
+                vspCamView.Start();
+                tbxReportId.Focus();
             }
-            vspCamView.VideoSource = videoDevice;
-            vspCamView.Start();
-            tbxReportId.Focus();
         }
 
         private void disconnect()
@@ -304,6 +311,8 @@ namespace Kivii.Sample.ImageUploader
                             }
                         }
                     }
+                    tbxReportId.Focus();
+
                 }
                 catch (Exception ex)
                 {