比较ASP.NET中GridView中的两个日期

Question

I have a GridView with two Date columns which are EditTemplates . How do I compare the 2 dates?

Answer 1

Normally I think I would do something like this:

if (Convert.ToDateTime(GridView1.Rows[1].Cells[1].Text) > DateTime.Now)....

You could use DateDiff() to find the difference between the dates if DateTime.Compare() does not work for you.

What have you tried?

Answer 2

try like this..

<asp:GridView ID="GridView1" runat="server" DataSourceID="SqlDataSource1" AutoGenerateColumns="false" OnRowDataBound="GridView1_RowDataBound">
        <Columns>
          <asp:TemplateField HeaderText="Start Date">
            <ItemTemplate>
              <asp:Label runat="server" ID="Label1" Text='<%# Eval("StartDate") %>'></asp:Label>
            </ItemTemplate>
            <EditItemTemplate>
              <asp:TextBox runat="server" ID="TextBox1" Text='<%# Eval("StartDate","{0:d}")  %>'></asp:TextBox>
            </EditItemTemplate>
          </asp:TemplateField>
          <asp:TemplateField HeaderText="End Date">
            <ItemTemplate>
              <asp:Label runat="server" ID="Label2" Text='<%# Eval("EndDate") %>'></asp:Label>
            </ItemTemplate>
            <EditItemTemplate>
              <asp:TextBox runat="server" ID="TextBox2" Text='<%# Eval("EndDate","{0:d}") %>'></asp:TextBox>
            </EditItemTemplate>
          </asp:TemplateField>
          <asp:CommandField ShowEditButton="true" />
        </Columns>
</asp:GridView>  

Protected Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
        If (e.Row.RowState = DataControlRowState.Edit) Then
            Dim cv As CompareValidator = New CompareValidator
            e.Row.Cells(1).Controls.Add(cv)
            cv.ControlToValidate = "TextBox2"
            cv.Type = ValidationDataType.Date
            cv.Operator = ValidationCompareOperator.GreaterThan
            cv.ErrorMessage = "End date should be later than start date!"
            cv.ValueToCompare = CType(e.Row.FindControl("TextBox1"),TextBox).Text
        End If
    End Sub

You can change index or anything as your real situation.

I hope it will helps you....