asp.net中的更新面板 [英] update panel in asp.net

问题描述

我在母版页中有更新面板，其中包含两个下拉列表状态和城市，我在内容页面中有更新面板，其中包含datalist控件...如何根据下拉列表中的选定值绑定datalist

i have update panel in master page which contains two dropdown list states and city and i have update panel in content page which contains datalist control...how can i bind datalist according to selected value in dropdown lists

推荐答案

您可以使用此方法从母版页中找到下拉列表值。

you can find dropdownlist value from master page by using this method.

string StateValue;
DropDownList masterState = (DropDownList)Master.FindControl("ddlState");
DropDownList masterCity = (DropDownList)Master.FindControl("ddlCity");
StateValue = masterState.SelectedValue;

这很简单。在内容页面中，您可以在母版页中搜索控件，如果找到控件，您可以执行以下操作：

It is pretty simple. From the content page, you can search for the controls in the master page and if the control is found, you can do something like this:

DropDownList stateInMaster = null;
if(Master.FindControl("ddlState") != null)
 stateInMaster = (DropDownList)Master.FindControl("ddlState");
staring selectedStateValue = stateInMaster.SelectedValue;

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