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我们能够自动把名单上的第一个项目重新列入正文。
原标题:Can we make dropdownlist in asp.net automatically post back the first item in the list
  • 时间:2011-10-25 03:25:29
  •  标签:
  • c#
  • asp.net

这里的简单法典:

protected void DropDownList1_SelectedIndexChanged1(object sender, EventArgs e)
{

    string word = DropDownList1.SelectedItem.Text;

    generateSynomyn(word);

}

在我选择指数上的第一个项目时,该法典没有执行。 为了执行第一个项目的代码,我必须首先选择任何其他项目,然后才选择<代码>dropdownlist的第一个项目。

而且,我们能够自动贴出或至少贴出<条码>。 <代码>中的第一个项目?

最佳回答

为使<代码>DropDownList的火焰进入一个空白项目,必须选定:

//put this where you bind your items the first time
DropDownList1.Items.Insert(0, ""); //adds a blank item first in the list
//or something like this
DropDownList1.Items.Insert(0, new ListItem("[ select an item ]",""));
问题回答

在您的博士前活动上加入:

 DropDownList1.Insert(0, new ListItem("-Select One-", "0"));
 DropDownList1.SelectedIndex = 0;

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