GridView EditItemTemplate 内的 DataBinding DropDownList

Question

我有一个使用数据集填充数据的 Gridview。 我还有一个 DropDownlist，它是 TemplateField 的 EditTemplate。 我想将它绑定到数据集，以便它可以从中填充数据。我搜索了它，但它似乎不起作用。我是新手。如果不是代码，一些帮助我获得一个很好的教程。

这是我的代码 sn-p：

`

protected void Page_Load(object sender, EventArgs e)
{
    if (Page.IsPostBack == false) {
        BindGrid();

    }
}
private void BindGrid() { 
    //Get dataset
    //bind

    DataSet ds = new DataSet("Employees");
    SqlConnection con = new SqlConnection("Password=admin;User ID=admin;Initial Catalog=asptest;Data Source=dbsvr");
    SqlDataAdapter da = new SqlDataAdapter("select * from employees", con);

    da.Fill(ds);
    gvEmp.DataSource = ds;
    gvEmp.DataBind();    
}


protected void gvEmp_RowEditing(object sender, GridViewEditEventArgs e)
{
    gvEmp.EditIndex = e.NewEditIndex;
    BindGrid();
    BindDropDown();        
}

private void BindDropDown() {
    //DataSet ds = new DataSet("Employees");
    //SqlConnection con = new SqlConnection("Password=priyal;User ID=priyal;Initial Catalog=asptest;Data Source=dbsvr");
    //SqlDataAdapter da = new SqlDataAdapter("select deptno from employees", con);

    //da.Fill(ds);
    //gvEmp.DataSource = ds;
    //gvEmp.FindControl("ddlDept").DataBind();




}
protected void gvEmp_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
{
    //this means that no index is selected
    gvEmp.EditIndex = -1;
}`

注释的代码是我试过的。

谢谢

Answer 1

试试这个。

protected void gvEmp_RowEditing(object sender, GridViewEditEventArgs e)
{
    DemoGrid.EditIndex = e.NewEditIndex;
    BindGrid();
    DropDownList dropdown = gvEmp.Rows[e.NewEditIndex].FindControl("DropDownList1") as DropDownList;
    BindDropDown(dropdown);
}

private void BindDropDown(DropDownList temp)
{
    string connectionString = "Password=priyal;User ID=priyal;Initial Catalog=asptest;Data Source=dbsvr";
    string query = "select deptno from employees";
    DataSet dataset = new DataSet("Employees");
    using (SqlConnection connection = new SqlConnection(connectionString))
    {
        using (SqlDataAdapter adapter = new SqlDataAdapter(query, connection))
        {
            adapter.Fill(dataset);
        }
    }

    temp.DataSource = dataset;
    temp.DataTextField = "deptno";
    temp.DataValueField = "deptno";
    temp.DataBind();
}

除非您将行 DropDownList 作为参数传递，否则您的 BindDropDown 将如何识别要绑定到哪个 DropDownList？

Answer 2

我认为你已经接近了 - 在 BindDropDown() 方法中试试这个：

// Set the DropDownList's DataSource (originally you were setting the GridView's DataSource
((DropDownList)gvEmp.FindControl("ddlDept")).DataSource = ds;
// Call DataBind() on the DropDownList
((DropDownList)gvEmp.FindControl("ddlDept")).DataBind();

您需要在 GridView 中找到控件，将其转换为正确类型的控件（在本例中为 DropDownList），然后对其执行操作。