优化

Src/FrmMain.cs

@@ -256,6 +256,12 @@ namespace Kivii.Sample.ImageUploader
 
         private void connect(int selectedIndex = 0)
         {
+            if (InvokeRequired)
+            {
+                Invoke(new Action<int>(connect), selectedIndex);
+            }
+            else
+            {
                 if (videoDevice == null) return;
                 if ((videoCapabilities != null) && (videoCapabilities.Length != 0))
                 {
@@ -265,6 +271,7 @@ namespace Kivii.Sample.ImageUploader
                 vspCamView.Start();
                 tbxReportId.Focus();
             }
+        }
 
         private void disconnect()
         {
@@ -304,6 +311,8 @@ namespace Kivii.Sample.ImageUploader
                             }
                         }
                     }
+                    tbxReportId.Focus();
+
                 }
                 catch (Exception ex)
                 {