与数据库绑定后添加在DropDownList中的默认值 [英] Adding a default value in dropdownlist after binding with database

问题描述

我绑定我的DDL到我的数据库如下，但我怎么能对绑定值的顶部添加默认文本，使其显示为：

I binded my ddl to my database as below, but how can I add a default text on top of the binded values so that it appears as:

Select Color ---> default text
Red ---> database value
Blue ---> database value
Green ---> database value   

code：

    DropDownList ddlSize = (DropDownList)FormView_Product.Row.Cells[0].FindControl("ddlSize");
    CommerceEntities db = new CommerceEntities();

    ddlColor.DataSource = from p in db.ProductTypes
                                      where p.ProductID == pID
                                      orderby p.Color 
                                      select new { p.Color };
    ddlColor.DataTextField = "Color";

谢谢！

推荐答案

数据绑定后，做到这一点：

After data-binding, do this:

ddlColor.Items.Insert(0, new ListItem("Select","NA")); //updated code

或者跟随，如果你想这样做的标记Brian的第二个建议。

Or follow Brian's second suggestion if you want to do it in markup.

您可能应该添加一个RequiredFieldValidator控件，并设置其与InitialValue为NA。

You should probably add a RequiredFieldValidator control and set its InitialValue to "NA".

<asp:RequiredFieldValidator .. ControlToValidate="ddlColor" InitialValue="NA" />

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