修复税务统计导出可能失败的问题

TEMUKJD/WXForms/ShopForms/WXTaxManage.cs

@@ -620,7 +620,7 @@ namespace TemuKJD.WXForms.ShopForms
             }
         }
 
-        private void btnExportCSV_Click(object sender, EventArgs e)
+        private async void btnExportCSV_Click(object sender, EventArgs e)
         {
             var selectRows = dgvShop.Rows.Cast<DataGridViewRow>().Where(r => r.Cells["colSelect"].Value.ParseToBool() == true).ToList();
             if (selectRows.Count == 0)
@@ -644,6 +644,7 @@ namespace TemuKJD.WXForms.ShopForms
             dialog.FileName = "用户 " + BaseClass.NickName + DateTime.Now.ToString(" 订单流水yyyyMMddHHmmss") + ".csv";
             if (dialog.ShowDialog() != DialogResult.OK)
                 return;
+
             var path = dialog.FileName;
 
             //FolderBrowserDialog dialog = new FolderBrowserDialog();
@@ -657,16 +658,12 @@ namespace TemuKJD.WXForms.ShopForms
 
             this.btnExport.Enabled = false;
             this.btnSearch.Enabled = false;
-            Task.Run(() => {
-                Thread.Sleep(5000);
-                Invoke(new Action(() =>
-                {
-                    this.btnExport.Enabled = true;
-                    this.btnSearch.Enabled = true;
-                }));
-            });
 
-            Task.Run(() =>
+            if (cancellationTokenSource != null)
+                cancellationTokenSource.Cancel();
+            cancellationTokenSource = new CancellationTokenSource();
+
+            await Task.Run(() =>
             {
                 int num = 0;
                 foreach (var row in selectRows)
@@ -706,6 +703,9 @@ namespace TemuKJD.WXForms.ShopForms
                     }
                 }));
             }, cancellationTokenSource.Token);
+
+            this.btnExport.Enabled = true;
+            this.btnSearch.Enabled = true;
         }
 
         private void dgvDaRenProd_CellContentClick(object sender, DataGridViewCellEventArgs e)