优化

Src/CanonForm.Designer.cs

@@ -456,6 +456,7 @@
             this.Name = "CanonForm";
             this.Text = "Canon";
             this.FormClosing += new System.Windows.Forms.FormClosingEventHandler(this.CanonForm_FormClosing);
+            this.Load += new System.EventHandler(this.CanonForm_Load);
             this.SaveToGroupBox.ResumeLayout(false);
             this.SaveToGroupBox.PerformLayout();
             ((System.ComponentModel.ISupportInitialize)(this.BulbUpDo)).EndInit();

Src/CanonForm.cs

@@ -7,6 +7,7 @@ using System.Drawing;
 using System.IO;
 using System.Linq;
 using System.Text;
+using System.Threading;
 using System.Threading.Tasks;
 using System.Windows.Forms;
 
@@ -59,6 +60,7 @@ namespace Kivii.Canon
             try
             {
                 IsInit = false;
+                MainCamera.CloseSession();
                 MainCamera?.Dispose();
                 APIHandler?.Dispose();
             }
@@ -116,8 +118,11 @@ namespace Kivii.Canon
                 var task = Task.Run(async delegate
                 {
                     var filePath = $"{dir}\\{Info.FileName}";
-                    await Task.Delay(1500);
-                    if (!File.Exists(filePath)) return;
+                    await Task.Delay(500);
+                    if (!File.Exists(filePath))
+                    {
+                        return;
+                    }
                     if (DownloadCompletely != null)
                     {
                         DownloadCompletely(filePath, EventArgs.Empty);
@@ -164,7 +169,7 @@ namespace Kivii.Canon
             try  
             {
                 if ((string)TvCoBox.SelectedItem == "Bulb") MainCamera.TakePhotoBulb((int)BulbUpDo.Value);
-                else MainCamera.TakePhotoShutter();
+                else MainCamera.TakePhotoShutterAsync();
                 //if ((string)TvCoBox.SelectedItem == "Bulb") MainCamera.TakePhotoBulbAsync((int)BulbUpDo.Value);
                 //else MainCamera.TakePhotoShutterAsync();
             }
@@ -349,6 +354,20 @@ namespace Kivii.Canon
             LiveViewButton.Text = "Start LV";
         }
 
+        private void CanonForm_Load(object sender, EventArgs e)
+        {
+            if (CameraListBox.SelectedIndex >= 0)
+            {
+                SessionButton_Click(null, null);
+                Thread.Sleep(1000);
+                if (MainCamera?.SessionOpen == true&& MainCamera?.IsLiveViewOn==false)
+                {
+                    LiveViewButton_Click(null, null);
+                }
+            }
+
+        }
+
         private void RefreshCamera()
         {
             CameraListBox.Items.Clear();