如何在gridview中添加下拉列表并使用数据库绑定下拉列表？

Question

我必须在网格视图中添加一个下拉列表并与数据库绑定。

代码：

protected void Page_Load(object sender, EventArgs e)
{
        if (!IsPostBack)
        {
            DataSet1TableAdapters.emplTableTableAdapter tb;
            tb = new DataSet1TableAdapters.emplTableTableAdapter();
            DataTable dt = new DataTable();
            dt = tb.GetEmpID();
            DropDownList1.DataSource = dt;
            DropDownList1.DataTextField = "empId";
            DropDownList1.DataValueField = "empId";
            DropDownList1.DataBind();
            DropDownList1.Items.Insert(0, new ListItem("--Select Employee ID--", ""));
        }
}

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
        DataSet1TableAdapters.emplTableTableAdapter tb;
        tb = new DataSet1TableAdapters.emplTableTableAdapter();
        DataTable dt = new DataTable();

        dt = tb.GetGrid(int.Parse(DropDownList1.SelectedValue));
        GridView1.DataSource = dt;
        GridView1.DataBind();
}

protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
        //Set the edit index.
        GridView1.EditIndex = e.NewEditIndex;
        //Bind data to the GridView control.
        BindData();
}

private void BindData()
{
        DataSet1TableAdapters.emplTableTableAdapter tb;
        tb = new DataSet1TableAdapters.emplTableTableAdapter();
        DataTable dt = new DataTable();

        dt = tb.GetGrid(int.Parse(DropDownList1.SelectedValue));
        GridView1.DataSource = dt;
        GridView1.DataBind();
}

ASPX：

<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged"> </asp:DropDownList>

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" AutoGenerateEditButton="True" OnRowEditing="GridView1_RowEditing">

<Columns>
 <asp:BoundField DataField="empId" HeaderText="Employee ID" ReadOnly="True" SortExpression="empId" />
 <asp:BoundField DataField="empName" HeaderText="Employee Name" ReadOnly="True"  
  SortExpression="empName" />
 <asp:TemplateField HeaderText="Employee Designation" SortExpression="empDesig">
 <EditItemTemplate>
 <asp:DropDownList ID="DropDownList2" runat="server">
 </asp:DropDownList>
 </EditItemTemplate>
 <ItemTemplate>
 <asp:Label ID="Label1" runat="server" Text='<%# Bind("empDesig") %>'></asp:Label>
 </ItemTemplate>
 </asp:TemplateField>
</Columns>
</asp:GridView>

表：

现在我得到如下所示的输出：

---

我需要使用db empDesig列绑定下拉列表。下面是一个示例输出设计，我真正期待的是。

Answer 1

您可以使用EditItemTemplate，如下所示

  <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" >
        <Columns>
            <asp:TemplateField HeaderText="City">
                <EditItemTemplate>
                    <asp:DropDownList ID="DropDownList1" runat="server" DataTextField="<TextColumnNameInDataSource>" DataValueField="<ValueColumnNameInDataSource>" 
                        />

                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Label ID="Label1" runat="server" ></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>

在正常模式下，您将看到ItemTemplate中的控件，当您单击编辑并且行处于编辑模式时，您将看到EditItemTemplate中的任何内容。同时，它们都具有DataSource，DataTextField，DataValueField属性，用于填充值dropdownlist和SelectedValue属性，用于显示所选值。

Answer 2

将DataKey和onrowupdating添加到您的aspx Gridview和

    <asp:Gridview id = "dg1" onrowupdating="dg1_RowUpdating" DataKeyNames="ID" 

    <Columns>
        <asp:TemplateField HeaderText="City">
            <EditItemTemplate>
                <asp:DropDownList ID="ddl_City" runat="server" />


            </EditItemTemplate>
            <ItemTemplate>
                <asp:Label ID="lbcity" runat="server" ></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>

      </Gridview> 

然后是代码背后：

      protected void dg1_RowUpdating(object sender, GridViewUpdateEventArgs ee)
    {
        int ID = Convert.ToInt32(dg1.DataKeys[e.RowIndex].Value.ToString());

        TextBox contactname= (TextBox)dg1.Rows[e.RowIndex].FindControl("contact");
        DropDownList ddl_city= (DropDownList)dg1.Rows[e.RowIndex].FindControl("City");


      }  

     protected void dg1_RowDataBound(object sender, GridViewRowEventArgs e) 
        { 
           if ((e.Row.RowState & DataControlRowState.Edit) > 0)
            {
                } 

         }

Answer 3

使用此代码

<asp:GridView ID="GridView1" runat="server"> 
      <asp:BoundField DataField="Contact_Name" HeaderText="Contact Name" />
       <asp:TemplateField HeaderText="City">
           <ItemTemplate>
             <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged"> </asp:DropDownList>   
            </ItemTemplate>
     </asp:TemplateField>
</asp:GridView>