C#从gridview asp net的下拉列表中获取选定的值

Question

每当 gridview 中的下拉列表的值发生变化时，如何更改文本框的值？

在页面加载时，文本框显示所选值，但当我更改下拉列表的选择时，文本框值没有改变。

代码如下。

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns = "false">
    <Columns>
        <asp:TemplateField HeaderText="Entry">
            <ItemTemplate>
                <%# Container.DataItemIndex + 1 %>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Duty">
            <ItemTemplate>
                <asp:DropDownList ID="duty" runat="server" OnLoad = "ddl1_load" OnSelectedIndexChanged="duty_SelectedIndexChanged" autopostback="true" EnableViewState="true"></asp:DropDownList>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

背后的代码如下。

protected void ddl1_load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        DataTable dt = new DataTable();
        Duty dy = new Duty();
        dt = dy.getdutyid(Convert.ToInt32(dropcontractid.SelectedValue));
        DropDownList ddl = (DropDownList)sender;
        ddl.DataSource = dt;
        ddl.DataTextField = "dutyid";
        ddl.DataValueField = "dutyid";
        ddl.DataBind();
        TextBox1.Text = ddl.SelectedValue;
    }
}

Answer 1

您需要使用 SelectedIndexChanged 处理程序来显示所选值:

标记:

<asp:DropDownList ID="duty" runat="server" OnLoad="ddl1_load" OnSelectedIndexChanged="duty_SelectedIndexChanged"></asp:DropDownList>

代码隐藏:

protected void duty_SelectedIndexChanged(object sender, EventArgs e)
{
    GridViewRow gvr = (GridViewRow)(((Control)sender).NamingContainer);   
    DropDownList duty= (DropDownList) gvr.FindControl("duty");
    TextBox1.Text = duty.SelectedItem.Value;
}