数据绑定DROPDOWNLIST数据表格并添加自定义值 [英] Databinding Dropdownlist with data table and adding custom value

问题描述

我是我的数据绑定的DropDownList与datatable.And我需要多一个项目添加到需要在selection..I的第一个项目已经试了很多办法，但没有工作的下拉列表。

  ddlCountry.Items.Add（ - 选择---）;
ddlCountry.DataTextField =国家;
ddlCountry.DataValueField =国家;
ddlCountry.DataSource = DT;
ddlCountry.DataBind（）;
 

解决方案

您页声明：

 ＆LT; ASP：DropDownList的ID =ddlCountryAppendDataBoundItems =真=服务器＆GT;
    ＆LT; ASP：ListItem的值=0文本=[选择]选定=真＆GT;＆LT; / ASP：ListItem的＆GT;
＆LT; / ASP：DropDownList的＆GT;AppendDataBoundItems =true是关键。
 

您code背后：

  ddlCountry.DataTextField =国家;
ddlCountry.DataValueField =国家;
ddlCountry.DataSource = DT;
ddlCountry.DataBind（）;
 

I am databinding my dropdownlist with a datatable.And I need to add one more item to the dropdown list which needs to be the first item in selection..I had tried many ways but nothing working.

ddlCountry.Items.Add("--Select--");
ddlCountry.DataTextField = "Country";
ddlCountry.DataValueField = "Country";
ddlCountry.DataSource = dt;
ddlCountry.DataBind();

解决方案

Your page declaration:

<asp:dropdownlist id="ddlCountry" AppendDataBoundItems="true" runat="server" >
    <asp:ListItem Value="0" Text="[ Select ]" Selected="True"></asp:ListItem>
</asp:dropdownlist>

AppendDataBoundItems="true" is the key.

Your code behind:

ddlCountry.DataTextField = "Country";
ddlCountry.DataValueField = "Country";
ddlCountry.DataSource = dt;
ddlCountry.DataBind();

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