周转表分页导出

AutoTurnOver/Common/DataTableHelper.cs

@@ -16,24 +16,30 @@ namespace AutoTurnOver.Common
         /// <param name="fileName">CSV的文件路径</param>
         public static void SaveCSV(DataTable dt, string fileName)
         {
-            if (!Directory.Exists(Path.GetDirectoryName(fileName)))
+            // 是否追加
+            var existsPush = Directory.Exists(Path.GetDirectoryName(fileName));
+            if (!existsPush)
             {
                 Directory.CreateDirectory(Path.GetDirectoryName(fileName));
             }
-            FileStream fs = new FileStream(fileName, System.IO.FileMode.Create, System.IO.FileAccess.Write);
+            FileStream fs = new FileStream(fileName, System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.Write);
             StreamWriter sw = new StreamWriter(fs, System.Text.Encoding.Default);
             string data = "";
 
-            //写出列名称
-            for (int i = 0; i < dt.Columns.Count; i++)
+            if (!existsPush)
             {
-                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
             for (int i = 0; i < dt.Rows.Count; i++)