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How can I get the selected item of a dropdownlist,the first time my page loads?4个
我试图在我的页面上获取所有下拉列表,并在每个下拉列表中选择所选项目文本/值.但我似乎错过了一些东西.
我试图在我的页面上获取所有下拉列表,并在每个下拉列表中选择所选项目文本/值.但我似乎错过了一些东西.
foreach (DropDownList dr in this.Page.Form.Controls.OfType<DropDownList>()) { foreach (ListItem li in dr.Items) { if (li.Selected) { //put the selected items value/text into something. } } }
有没有想过这样做?
编辑:使其更清晰.我有一个随机数量的DropDownLists,我可以选择1个选项pr Dropdownlist.当我按下按钮时,我需要从每个DropDownLists中选择的内容中获取信息. (DropDownLists上没有ID,有一个随机数).
解决方法
protected void Button1_Click(object sender,EventArgs e) { List<DropDownList> lst = new List<DropDownList>(); GetDropDownControls(GetListOfControlCollection(this.Form.Controls),ref lst); foreach (DropDownList item in lst) { var selectedValue = item.SelectedValue; //to do something with value } } void GetDropDownControls(List<Control> controls,ref List<DropDownList> lst) { foreach (Control item in controls) { if (item.Controls.Count == 0 && item is DropDownList) lst.Add((DropDownList)item); else if (item.Controls.Count > 0) GetDropDownControls(GetListOfControlCollection(item.Controls),ref lst); } } List<Control> GetListOfControlCollection(ControlCollection controls) { List<Control> result = new List<Control>(); foreach (Control item in controls) { result.Add(item); } return result; }