小编Var*_*yee的帖子

我正在使用asp.net MVC 4和epplus作为nuget包,用于将我的数据导出到excel文件中.我这样做如下:

        var excel = new ExcelPackage();
        var workSheet = excel.Workbook.Worksheets.Add("Consumption");
        workSheet.View.RightToLeft = true;
        for (var col = 1; col <= totalCols; col++)
        {
            workSheet.Cells[1, col].Style.Font.Name = "B Zar";
            workSheet.Cells[1, col].Style.Font.Size = 16;
            workSheet.Cells[1, col].Style.Font.Bold = true;
            workSheet.Cells[1, col].Style.Fill.PatternType = OfficeOpenXml.Style.ExcelFillStyle.Solid;
            workSheet.Cells[1, col].Style.Fill.BackgroundColor.SetColor(System.Drawing.Color.LightGray);
            workSheet.Cells[1, col].Value = ds.Tables[0].Columns[col - 1].ColumnName;
        }

        for (var row = 1; row <= totalRows; row++)
            for (var col = 0; col < totalCols; col++)
            {
                workSheet.Cells[row + 1, col + 1].Style.Font.Name = "B Zar";
                workSheet.Cells[row …

如何使用数据注释为固定长度的字符串设置字符串验证？

我想在我的模型上有一个属性,精确的10个字符串长度.

我正在数秒钟寻求帮助.

存在以下2个表:

T1:

 ---------------
|  Id  |  Name  |
 ---------------
|  1   |  One   |
|  2   |  Two   |
|  3   |  Three |
 ---------------

T2:

 ----------------------
|  Id  |  Name  | T1Id |
 ----------------------
|  6   |   X    |   3  |
|  7   |   Y    |   2  |
|  8   |   Z    |   1  |
 ----------------------

表1(T1)具有值为1,2和3的主键列"Id".表2(T2)具有与T1表相关的主键列"Id"和"T1Id"外键列.我正在尝试执行以下SQL命令:

SELECT * FROM (SELECT * FROM T1 ORDER BY Id ASC) AS Tmp
INNER JOIN T2 ON Tmp.Id = T2.Level1Id

我想知道虽然第一行尝试命令T1然后加入T2但结果集没有排序,其他DBMS就像Ms-SQL或Oracle那样.结果集是:

结果: …