Gridview OnSelectedIndexChanged="ddlrefresh_SelectedIndexChanged"> 的事件永远不触发？

最新推荐文章于 2016-11-04 09:57:42 发布

原创最新推荐文章于 2016-11-04 09:57:42 发布 · 1.9k 阅读

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本文探讨了在ASP.NET中如何正确地为GridView内的DropDownList设置事件处理程序，特别是通过RowDataBound事件来实现自动回发及事件绑定的方法，并提供了解决方案。

protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { bind(); } } public void bind() { string sqlStr = "select * from Employee"; DataSet myds = Common.dataSet(sqlStr); GridView1.DataSource = myds; GridView1.DataKeyNames = new string[] { "ID" }; GridView1.DataBind(); AccessDataSource s = new AccessDataSource("E://WebSite//GridViewExamples//GridViewExamples//App_Data//Example.mdb", "select * from Employee"); this.GridView1.DataSourceID = s.ID; this.GridView1.DataBind(); } protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e) { if (e.Row.RowType == DataControlRowType.DataRow) { DropDownList ddlrefresh = (DropDownList)e.Row.FindControl("ddlRefresh"); //ddlrefresh.NamingContainer ddlrefresh.AutoPostBack = true; ddlrefresh.SelectedIndexChanged += new EventHandler(ddlrefresh_SelectedIndexChanged); } } protected void ddlrefresh_SelectedIndexChanged(object sender, EventArgs e) { ClientScript.RegisterStartupScript(this.GetType(), "script13", "<mce:script type="text/javascript"></mce:script>"); }

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上面这样写dropdownlist 的事件永远不触发？

但是当代码换成

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<asp:TemplateField> <ItemTemplate> [color=#FF0000] <asp:DropDownList ID="ddlRefresh" runat="server" AutoPostBack="true" OnSelectedIndexChanged="ddlrefresh_SelectedIndexChanged">[/color] <asp:ListItem Value="1">1</asp:ListItem> <asp:ListItem Value="2">2</asp:ListItem> <asp:ListItem Value="3">3</asp:ListItem> </asp:DropDownList> </ItemTemplate> </asp:TemplateField>

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就会执行。
为什么第一种方法不执行呢？

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解决方法:

protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e) { if (e.Row.RowType == DataControlRowType.DataRow) { DropDownList ddlrefresh = (DropDownList)e.Row.FindControl("ddlRefresh"); //ddlrefresh.NamingContainer ddlrefresh.AutoPostBack = true; ddlrefresh.SelectedIndexChanged += new EventHandler(ddlrefresh_SelectedIndexChanged); } }

将事件代码加入到
RowCeated

就行了。