如何DropDownList的选定值绑定 [英] How to bind the selected value of a DropDownList

问题描述

数据绑定是所有关于声明code，对不对？所以，我指定我想与属性，而框架负责其余的照顾。除非我弄错和数据绑定涉及S＆安培;男，右

Data binding is all about declarative code, right? So I specify what I want with attributes, and the framework takes care of the rest. Unless I'm mistaken and data binding relates to S&M, right?

那么，为什么DropDownList控件只提供它的数据源，即其名单来源，而不是其实际的数据字段绑定字段。即如何赫克我绑定选定值我的名字DropDownList的名称字段在我的个人记录？这是微软的一大疏忽，还是我的？

So, why does the DropDownList control only provide binding fields for its data source, i.e. its list source, and not for its actual data field. i.e. how the heck to I bind the selected value my name DropDownList to the Name field in my Person record? Is this a gross oversight on Microsoft's part, or on mine?

什么是双向数据绑定，如果我仍然需要手工设置和读取所选值？点

What is the point of two way data binding if I still have to manually set and read the selected value?

推荐答案

您可能想要做的东西像下面的code。
你不能设置的SelectedValue声明，但说
的SelectedValue =＆LT;％＃[code这里]％>你实际上造成当控件的数据势必要设置的值

You might want to do something like the code below. You can not set the "SelectedValue" declaratively, but by saying "SelectedValue=<%# [code here] %> you are effectively causing the value to be set when the control is data bound.

<asp:DropDownList
                ID="DropDownInfoSource"
                runat="server"
                DataSourceID="_employeeDataSource"
                DataTextField="EmployeeName"
                DataValueField="EmployeeID"
                SelectedValue='<%# Bind("EmployeeID") %>'
                />

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