优化相机拍照后文件下载问题

Src/CanonForm.cs

@@ -60,7 +60,7 @@ namespace Kivii.Canon
             try
             {
                 IsInit = false;
-                MainCamera.CloseSession();
+                MainCamera?.CloseSession();
                 MainCamera?.Dispose();
                 APIHandler?.Dispose();
             }
@@ -109,27 +109,32 @@ namespace Kivii.Canon
         {
             try
             {
-                string dir = null;
-                Invoke((Action)delegate { dir = SavePathTextBox.Text; });
-                sender.DownloadFile(Info, dir);
+                Info.FileName = $"{DateTime.Now.ToString("ssfff")}_{Info.FileName}";
+                //string dir = null;
+                var steam = sender.DownloadFile(Info);
+                //Invoke((Action)delegate { dir = SavePathTextBox.Text; });
+                //sender.DownloadFile(Info, dir);
                 Invoke((Action)delegate { MainProgressBar.Value = 0; });
-
-                //延时等待图片下载完毕后抛出事件
-                var task = Task.Run(async delegate
-                {
-                    var filePath = $"{dir}\\{Info.FileName}";
-                    await Task.Delay(500);
-                    if (!File.Exists(filePath))
-                    {
-                        return;
-                    }
                 if (DownloadCompletely != null)
                 {
-                        DownloadCompletely(filePath, EventArgs.Empty);
-                    }
-
-                    return;
-                });
+                    DownloadCompletely(steam, EventArgs.Empty);
+                }
+                ////延时等待图片下载完毕后抛出事件
+                //var task = Task.Run(async delegate
+                //{
+                //    var filePath = $"{dir}\\{Info.FileName}";
+                //    await Task.Delay(500);
+                //    if (!File.Exists(filePath))
+                //    {
+                //        return;
+                //    }
+                //    if (DownloadCompletely != null)
+                //    {
+                //        DownloadCompletely(steam, EventArgs.Empty);
+                //    }
+
+                //    return;
+                //});
             }
             catch (Exception ex) { ReportError(ex.Message, false); }
         }