Question

我的gridview中有一个下拉列表。下拉列表中的数据为“Y”和“N”。这两个字母。如果我选择Y，那么单元格值6将需要变为零。但它不起作用。这是我的代码。

 protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
     if (e.Row.RowType == DataControlRowType.DataRow)
        {
         DropDownList DropDownList3=(DropDownList)e.Row.FindControl("DropDownList");
         //if (DropDownList3 == null)
             //if (DropDownList3.SelectedValue == "Y")
          if(DropDownList3.SelectedItem.Text == "Y")

         {
             e.Row.Cells[6].Text = "0";
         }
         else
         {
             e.Row.Cells[6].Text = "1";
         }
        }
}

这是我的dropdowlist模板字段

<asp:TemplateField HeaderText="Alt">
                <EditItemTemplate>
                    <asp:DropDownList ID="DropDownList3" runat="server" >
                        <asp:ListItem>Y</asp:ListItem>
                        <asp:ListItem>N</asp:ListItem>
                    </asp:DropDownList>
                </EditItemTemplate>
                <FooterTemplate>
                    <asp:DropDownList ID="DropDownList3" runat="server" >
                        <asp:ListItem>Y</asp:ListItem>
                        <asp:ListItem>N</asp:ListItem>
                    </asp:DropDownList>
                </FooterTemplate>
                <ItemTemplate>
                    <asp:DropDownList ID="DropDownList3" runat="server" >
                        <asp:ListItem>Y</asp:ListItem>
                        <asp:ListItem>N</asp:ListItem>
                    </asp:DropDownList>
                </ItemTemplate>

            </asp:TemplateField>

Answer 1

首先，您必须为final int [] finalArr={5,6,8}; System.out.println("Value at index 0 is "+finalArr[0]); //output : Value at index 0 is 5 //perfectly fine finalArr[0]=41; System.out.println("Changed value at index 0 is "+finalArr[0]); //Changed value at index 0 is 41 int[] anotherArr={7,9,6}; // finalArr=anotherArr; //error : cannot assign a value to final variable finalArr设置AutoPostBack="true"，并且您必须为ddl创建EventHandler，但在DropDownList3中不在RowCreated中。

有例子（它的vb.net）：

ASPX：

RowDataBound

然后，代码背后：

<asp:TemplateField HeaderText="Alt">
 <ItemTemplate>
   <asp:DropDownList ID="DropDownList3" runat="server" AutoPostBack="true">
     <asp:ListItem>Y</asp:ListItem>
     <asp:ListItem>N</asp:ListItem>
   </asp:DropDownList>
 </ItemTemplate>
</asp:TemplateField>

非常重要在Private Sub GridView1_RowCreated(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles grid1.RowCreated If e.Row.RowType = DataControlRowType.DataRow Then Dim ddl As DropDownList = CType(e.Row.FindControl("DropDownList3"), DropDownList) AddHandler ddl.SelectedIndexChanged, AddressOf ddlChange End If End Sub Private Sub ddlChange(ByVal sender As Object, ByVal e As EventArgs) Dim ddl As DropDownList = DirectCast(sender, DropDownList) Dim row As GridViewRow = ddl.NamingContainer If ddl.SelectedItem.Text = "Y" Then row.Cells(6).Text = "0" Else ' do what You want End If End Sub之后你不会绑定GridView，当然，PostBack必须设置为EnableViewState

由于我在True工作，我会尝试将此代码转换为vb.net。

更新：

有c#代码（我使用在线转换器）：

c#

gridview行数据绑定中的dropdownlist未正确执行

1 个答案: