如何檢查使用asp.net的網格視圖的第一行和列

Question

我有一個gridview有兩列。我想檢查第一行和第一列應該是強制性的。如果第一列爲空，則不應允許保存並且應顯示消息爲

一行應該是強制性的。

如何檢查？

我的保存按鈕點擊編碼是如下

Dim row As GridViewRow 
For Each row In GridView1.Rows 
If row.RowType = DataControlRowType.DataRow Then 
    Dim t1 As String = CType(row.FindControl("TextBox2"), TextBox).Text 
    Dim dd As String = CType(row.FindControl("DropDownList3"), DropDownList).SelectedItem.Text 
    If Trim(t1) = "" Or (Trim(dd)= "" then 
     label6.Text = "HospNo,Date,SurgeryCode/Method are Mandatory" 
    End If 

但這種檢查所有網格列，我想只檢查第一行和列。

Answer 1

For Each row In GridView1.Rows 
If row.RowType = DataControlRowType.DataRow Then 
Dim t1 As String = CType(row.FindControl("TextBox2"), TextBox).Text 
Dim dd As String = CType(row.FindControl("DropDownList3"),DropDownList).SelectedItem.Text 
If Trim(t1) = "" Or (Trim(dd)= "" then 
    label6.Text = "HospNo,Date,SurgeryCode/Method are Mandatory" 
End If 
Exit For 
End For 

Answer 2

您可以使用GridView1.Rows(0)得到的第一行：

Dim firstRow = GridView1.Rows(0) 
Dim TextBox2 = DirectCast(firstRow.FindControl("TextBox2"), TextBox) 
Dim DropDownList3 = DirectCast(firstRow.FindControl("DropDownList3"), DropDownList) 
If TextBox2.Text.Trim.Length = 0 OrElse DropDownList3.SelectedIndex = -1 Then 
    label6.Text = "HospNo,Date,SurgeryCode/Method are Mandatory" 
End If 

但是，這不是你應該在ASP.NET中使用的方法。而是使用RequiredFieldValidator，它可以在客戶端進行驗證。

例如：

<asp:GridView ID="GridView1" OnSelectedIndexChanged="Grid1_SelectedIndexChanged" AutoGenerateSelectButton="true" AutoGenerateColumns="false" runat="server" Width="300"> 
     <RowStyle CssClass="GridViewRowStyle" /> 
     <AlternatingRowStyle CssClass="GridViewAlternatingRowStyle" /> 
     <HeaderStyle CssClass="GridViewHeaderStyle" /> 
     <SelectedRowStyle BackColor="Aqua" /> 
     <Columns> 
      <asp:TemplateField HeaderText="Column 1" HeaderStyle-HorizontalAlign="Left"> 
       <ItemTemplate> 
        <asp:TextBox runat="server" ID="TxtColumn1" Text='<%# Bind("Column1") %>'></asp:TextBox> 
        <asp:RequiredFieldValidator id="RequiredFieldValidator1" 
         EnableClientScript="true" 
         ControlToValidate="TxtColumn1" 
         Display="Static" 
         ErrorMessage="HospNo,Date,SurgeryCode/Method are Mandatory" 
         runat="server"/> 
       </ItemTemplate> 
      </asp:TemplateField> 
     </Columns> 
    </asp:GridView>