选择下拉列表值时以及如何获取相应选择项的ID [英] when select a dropdownlist value and how to get id for corresponding select item

问题描述

当我选择一个下拉列表值时，如何获取相应所选项目的ID?

例如
City Master : city_id :1 ,city_name :Chennai.

当我从下拉列表中选择Chennai时，我想从数据库中获取存储的city_id.

当我从列表中选择Chennai时，如何获取city_id?

When I select a dropdownlist value how do I get an id for corresponding selected item?

Eg.
City Master : city_id :1 ,city_name :Chennai.

When I select Chennai from the dropdown list, I want to get the stored city_id from the database.

How do I get city_id, when I select a Chennai from the list?

推荐答案

您可以将显示成员设置为城市名称，将值成员设置为id.然后，在选择时，使用SelectedValue进行处理.

You can set the display member as the city name and value meember as id. Then, on selection, use the SelectedValue for processing.

在下拉列表中，将数据字段设置为city_name，将值设置为id.然后，当您选择一个项目时，使用选定的值

in the drop down list set the data field to city_name and the value to the id.Then when you select an item use the selected value of the item.

<pre lang="midl">ddlCity.DataSource=dt;
        ddlCity.DataTextField=&quot;CityName&quot;;
        ddlCity.DataValueField = &quot;CityId&quot;;
        ddlCity.DataBind();</pre>

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