如何在asp.net中运行时绑定radcombobox

Question

我有一个网页,在页面上有radrik控件的Telerik RadComboBox,我有一个SqlserverCe数据库.我的问题是如何在asp.net中编写代码来绑定RadCombobox页面加载事件请帮帮我... ..

Answer 1

项目绑定到RadComboBox基本上与ASP.NET DropDownList相同.

您可以将RadComboBox绑定到ASP.NET 2.0数据源,ADO.NET DataSet/DataTable/DataView,Arrays和ArrayLists,或IEnumerable对象.当然,您可以自己逐个添加项目.使用RadComboBox,您将使用RadComboBoxItems而不是ListItems.

在某种程度上,你必须告诉组合框每个项目的文本和值是什么.

使用服务器端代码中的项目:

protected void Page_Load(object sender, EventArgs e)
{  
    if (!Page.IsPostBack)  
    {    
        RadComboBoxItem item1 = new RadComboBoxItem();    
        item1.Text = "Item1";   
        item1.Value = "1";    
        RadComboBox1.Items.Add(item1);    
        RadComboBoxItem item2 = new RadComboBoxItem();   
        item2.Text = "Item2";    
        item2.Value = "2";   
        RadComboBox1.Items.Add(item2);    
        RadComboBoxItem item3 = new RadComboBoxItem();    
        item3.Text = "Item3";   
        item3.Value = "3";   
        RadComboBox1.Items.Add(item3);  
    }
}

绑定到DataTable,DataSet或DataView:

protected void Page_Load(object sender, EventArgs e)
{
    if (!Page.IsPostBack)
    {
        SqlConnection con = new SqlConnection("Data Source=LOCAL;Initial Catalog=Combo;Integrated Security=True");

        SqlDataAdapter adapter = new SqlDataAdapter("SELECT [Text], [Value] FROM [Links]", con);
        DataTable links = new DataTable();

        adapter.Fill(links);

        combo.DataTextField = "Text";
        combo.DataValueField = "Value";
        combo.DataSource = links;
        combo.DataBind();
    }
}

编辑: 网格中的RadComboBox:

在RadGrid中,通过设置EnableLoadOnDemand ="True"并处理OnItemsRequested事件,最简单的方法是按需加载.

protected void RadComboBox1_ItemsRequested(object sender, RadComboBoxItemsRequestedEventArgs e)
        {
            string sql = "SELECT [SupplierID], [CompanyName], [ContactName], [City] FROM [Suppliers] WHERE CompanyName LIKE @CompanyName + '%'";
            SqlDataAdapter adapter = new SqlDataAdapter(sql,
                ConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ConnectionString);
            adapter.SelectCommand.Parameters.AddWithValue("@CompanyName", e.Text);

            DataTable dt = new DataTable();
            adapter.Fill(dt);

            RadComboBox comboBox = (RadComboBox)sender;
            // Clear the default Item that has been re-created from ViewState at this point.
            comboBox.Items.Clear();

            foreach (DataRow row in dt.Rows)
            {
                RadComboBoxItem item = new RadComboBoxItem();
                item.Text = row["CompanyName"].ToString();
                item.Value = row["SupplierID"].ToString();
                item.Attributes.Add("ContactName", row["ContactName"].ToString());

                comboBox.Items.Add(item);

                item.DataBind();
            }
        } 

您还可以在网格的OnItemDataBoundHandler事件中手动绑定组合框:

protected void OnItemDataBoundHandler(object sender, GridItemEventArgs e)
        {
            if (e.Item.IsInEditMode)
            {
                GridEditableItem item = (GridEditableItem)e.Item;

                if (!(e.Item is IGridInsertItem))
                {
                    RadComboBox combo = (RadComboBox)item.FindControl("RadComboBox1");

                    // create and add items here
                    RadComboBoxItem item = new RadComboBoxItem("text","value");
                    combo.Items.Add(item);

                }
            }
        }