如何在DataGridView VB.net中四舍五入一列

Question

I am making an asp.net webpage using VB.Net that calculates the employee's yearly salary.

I have a GridView that displays a column with values of type double (they are double in the database "example: 66,556.91").

I want to round the values of this column so that I have 66,557 instead of 66,556.91. I checked msdn , and used {0:D} and {0:F0} in the DataFormatString in the gridview taks - edit columns but no value was changed.

<asp:BoundField DataField="C1" HeaderText="calculated taxes" ReadOnly="True" SortExpression="C1" DataFormatString="{0:F0}" />

What do you suggest?

Answer 1

像这样为薪水列更新了选择命令，它将在数据库末尾执行舍入运算。

SELECT ROUND(SalaryColumnName,0)

Answer 2

You can supply a DataFormatString in your boundcolumn definition of {0:f0} which will round your values to 0 decimal places.

Input Values

1
2.2
3.323
66556.91

Formatted Values 1 2 3 66557

Answer 3

Module Module1
  Sub Main()
  ' Call Math.Round on this Double.
Dim before As Double = 123.45
Dim after1 As Double = Math.Round(before, 1, MidpointRounding.AwayFromZero)
Dim after2 As Double = Math.Round(before, 1, MidpointRounding.ToEven)
Dim after3 As Double = Math.Round(before)

Console.WriteLine(before)
Console.WriteLine(after1)
Console.WriteLine(after2)
Console.WriteLine(after3)
Console.WriteLine()

  ' Use on this Decimal.
Dim before2 As Decimal = 125.101
Dim after4 As Decimal = Math.Round(before2)
Dim after5 As Decimal = Math.Round(before2, 1)

Console.WriteLine(before2)
Console.WriteLine(after4)
Console.WriteLine(after5)
End Sub
End Module

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Output

123.45
123.5
123.4
123

125.101
125
125.1