从DropDownList中asp.net所选项目的文本 [英] Text from selected item in DropDownList asp.net
问题描述
在页面加载我填充一个DropDownList是这样的:
In the pageload i populate a dropdownlist like this:
protected void Page_Load(object sender, EventArgs e)
{
string buildingTypeSoldier = "soldier";
var soldierBuilding = from b in dc.Buildings
where b.buildingtype == buildingTypeSoldier
select b.buildingname;
ddlSoldierBuildings.DataSource =soldierBuilding;
ddlSoldierBuildings.DataBind();
}
但是,当我再尝试在同一页面上设置标签的文本到selectetitem.text我只在列表中得到第一个项目,没有项目,我选择。我尝试使用一个按钮这样的设置文本:
But when i then try to set the text of a label on the same page to the selectetitem.text i only get the first item in the list, not the item i selected. I try to set the text by using a button like this:
protected void btnBuySoldierBuilding_Click(object sender, EventArgs e)
{
lblTestlabel.Text = ddlSoldierBuildings.SelectedItem.Text;
}
DropDownList中含有树项目,营房,射击范围,稳定这是我从我的数据库中获取。是否页面加载覆盖我的选择,当我点击按钮?我怎样才能解决这个问题?
the dropdownlist contains tree items, barracks, shooters range, and stable which i get from my database. Does the page load overwrite my selection when i click the button? How can i solve this?
推荐答案
这是因为你的的Page_Load
是事件处理程序之前发射。
That's because your Page_Load
is firing before your event handler.
裹在里面你的的Page_Load
初始化逻辑,如果块,你检查你的网页是处理回发或不通过检查的 Page.IsPostback
属性 。如果它是一个回传,那么你的初始化逻辑将不触发和重置您的下拉列表中。
Wrap your Page_Load
initialization logic inside an if block where you check if your page is handling a postback or not by checking the Page.IsPostback
property. If it's a postback, then your initialization logic won't fire and reset your drop down list.
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostback){
string buildingTypeSoldier = "soldier";
var soldierBuilding = from b in dc.Buildings
where b.buildingtype == buildingTypeSoldier
select b.buildingname;
ddlSoldierBuildings.DataSource =soldierBuilding;
ddlSoldierBuildings.DataBind();
}
}
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