c# - 在后面的 C# 代码中选择索引时，DropDownList.SelectedIndexChanged 不会触发

Question

我试图在后面的 C# 代码中选择 DropDownList 中的索引，但 SelectedIndexChanged 事件不会触发。正确的方法是什么？

  DropDownListChapterTitles.SelectedIndex = 1;


  protected void DropDownListChapterTitles_SelectedIndexChanged(object sender, EventArgs e)
  { }

Answer 1

检查您的标记，它应该看起来像这样

<asp:DropDownList runat="server" ID="DropDownListChapterTitles" AutoPostBack="True"
     OnSelectedIndexChange="DropDownListChapterTitles_SelectedIndexChanged">

</asp:DropDownList>

我添加了OnSelectedIndexChange="DropDownListChapterTitles_SelectedIndexChanged"

Answer 2

DropDownListChapterTitles.SelectedIndex = 1;
// Call it yourself
DropDownListChapterTitles_SelectedIndexChanged(this, null);