修改导出功能

AutoTurnOver/Common/DataTableHelper.cs

@@ -14,27 +14,32 @@ namespace AutoTurnOver.Common
         /// </summary>
         /// <param name="dt">提供保存数据的DataTable</param>
         /// <param name="fileName">CSV的文件路径</param>
-        public static void SaveCSV(DataTable dt, string fileName)
+        /// /// <param name="is_append">是否追加</param>
+        public static void SaveCSV(DataTable dt, string fileName,bool is_append = false)
         {
             // 是否追加
             if (!Directory.Exists(Path.GetDirectoryName(fileName)))
             {
                 Directory.CreateDirectory(Path.GetDirectoryName(fileName));
             }
-            FileStream fs = new FileStream(fileName, FileMode.Create, System.IO.FileAccess.Write);
-            StreamWriter sw = new StreamWriter(fs, System.Text.Encoding.Default);
+            FileStream fs = new FileStream(fileName, is_append?FileMode.OpenOrCreate: FileMode.Create, System.IO.FileAccess.ReadWrite);
+            StreamWriter sw = new StreamWriter(fs, System.Text.Encoding.UTF8);
             string data = "";
 
-            //写出列名称
-            for (int i = 0; i < dt.Columns.Count; i++)
+            if (is_append)
             {
-                data += dt.Columns[i].ColumnName.ToString();
-                if (i < dt.Columns.Count - 1)
+                //写出列名称
+                for (int i = 0; i < dt.Columns.Count; i++)
                 {
-                    data += ",";
+                    data += dt.Columns[i].ColumnName.ToString();
+                    if (i < dt.Columns.Count - 1)
+                    {
+                        data += ",";
+                    }
                 }
+                sw.WriteLine(data);
             }
-            sw.WriteLine(data);
+           
 
 
             //写出各行数据