Question

[WebMethod(EnableSession=true)]
    public static void ShortFall(List<Dictionary<string, string>> Data)
    {
        List<dynamic> RetData = new List<dynamic>();
        DataTable dtstock = new DataTable();
        DBHelper.DBhelpercls db = new DBHelper.DBhelpercls();
        List<dynamic> ShortfallTempArray = new List<dynamic>();
        List<dynamic> ShortfallTempArray2 = new List<dynamic>();
        List<dynamic> ShortfallArray = new List<dynamic>();
        foreach (Dictionary<string, string> EachItems in Data)
        {
            dtstock = db.GetTable("SELECT ISNULL(Qty,0) AS Stock_Qnty FROM TBLActualStock WHERE ItemCode='" + EachItems["ItemCode"].ToString() + "' AND Mode=1");
            if (dtstock.Rows.Count == 0)
            {
                ShortfallTempArray.Add(new { ItemCode = EachItems["ItemCode"].ToString(), ItemDesc = EachItems["ItemDesc"].ToString(), Qty =EachItems["Qty"].ToString(), Uom = EachItems["Unit"].ToString() });
            }
            else if (((Convert.ToSingle(dtstock.Rows[0]["Stock_Qnty"].ToString()) - Convert.ToSingle(EachItems["Qty"].ToString())) <= 0))
            {
                ShortfallTempArray.Add(new { ItemCode = EachItems["ItemCode"].ToString(), ItemDesc = EachItems["ItemDesc"].ToString(), Qty = (Convert.ToSingle(dtstock.Rows[0]["Stock_Qnty"].ToString()) - Convert.ToSingle(EachItems["Qty"].ToString())).ToString(), Uom = EachItems["Unit"].ToString() });
            }
        }

        var summary = from p in ShortfallTempArray
                      let k = new
                      {
                          ItemCode = p.ItemCode,
                          ItemDesc = p.ItemDesc,
                          Uom = p.Uom
                      }
                      group p by k into t
                      select new
                      {
                          ItemCode = t.Key.ItemCode,
                          ItemDesc = t.Key.ItemDesc,
                          Uom = t.Key.Uom,
                          Qty = t.Sum(p => Convert.ToInt32(p.Qty)) 
                      };
        foreach (var row in summary)
        {
            ShortfallTempArray2.Add(new { ItemCode = row.ItemCode, ItemDesc = row.ItemDesc, Qty = row.Qty.ToString(), Uom=row.Uom });
        }
        HttpContext.Current.Session["Short"] = ShortfallTempArray2;
    }

在上面的代码中，当Qty是一个整数时，它可以正常工作; 但如果它浮动或小数，则下面的行会出现错误。

Qty = t.Sum(p => Convert.ToInt32(p.Qty))

我只是将Convert.ToInt32更改为Convert.ToDouble，然后出现以下错误....

无法将类型'double'隐式转换为'int'。一个明确的存在转换（你错过了演员吗？）

Answer 1

可能错误是Qty数据类型，因为它应该是整数类型。

Answer 2

你可能正在尝试：

（INT）=（双）

你应该这样做：

Qty = (int)t.Sum(p => Convert.ToDouble(p.Qty));

或者将数量类型更改为加倍

使用linq对数据表中的行进行分组

2 个答案: