按钮事件函数没有触发(回发问题)

本文关键字：问题 事件 函数 按钮 | 更新日期: 2023-09-27 18:16:17

我有一个aspx页面，在按钮上点击动态更新。将带有按钮的表添加到占位符中。每个按钮都应该重定向到另一个页面，在查询字符串中发送它的id。

我遇到的问题是，当每个按钮被单击时，发生回发，按钮没有再次添加到页面中(因为方法正在通过按钮单击运行)，因此由事件触发的函数没有运行

我试着把所有的东西都放在一个updatepanel除了占位符，但然后表没有被添加在第一位。如何从页面加载再次调用btn_click函数?我应该传递什么参数呢?或者我可以添加不会引起回发的按钮?

这是aspx: 

<asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate>
   <h1 style="text-align:center;">חיפוש חברים</h1>
    <br />
        <table>
            <tr><td>אזור עבודה מועדף</td>
                <td>סיווג משני</td>
                <td>סיווג ראשי</td>
                <td>שם משפחה</td>
                <td>שם</td>
                <td>תז</td> 
            </tr>
            <tr>
            <td>
                <asp:DropDownList ID="working_area" CssClass="wid" runat="server">
                   <%--some items--%>
                </asp:DropDownList>
            </td>
            <td>
                <asp:DropDownList ID="d_d_second" CssClass="wid" runat="server">
                </asp:DropDownList>            
            </td>            
            <td>
                <asp:DropDownList ID="d_d_main" CssClass="wid" runat="server">
                    <asp:ListItem></asp:ListItem>

                </asp:DropDownList>
            </td>
            <td><asp:TextBox ID="m_l_name" CssClass="wid" runat="server"></asp:TextBox></td>
            <td><asp:TextBox ID="m_name" CssClass="wid" runat="server"></asp:TextBox></td>
            <td><asp:TextBox ID="m_id" CssClass="wid" runat="server"></asp:TextBox></td>        
            </tr>
            <tr>               
                <td style="text-align:left"><asp:Button ID="search" CssClass="btn btn-primary" 
                        runat="server" Text="חפש" onclick="search_Click" /></td>
            </tr>

        </table>
    <asp:PlaceHolder ID="search_tbl_ph" runat="server"></asp:PlaceHolder>
     </ContentTemplate>
     </asp:UpdatePanel>

这是后面的代码:

protected void Page_Load(object sender, EventArgs e)
{

}

protected void search_Click(object sender, EventArgs e)
{
    search_category s1 = new search_category();
    s1.id = m_id.Text;
    s1.name = m_name.Text;
    s1.l_name = m_l_name.Text; 
    s1.main_cat = d_d_main.SelectedValue;
    s1.second_cat = d_d_second.SelectedValue;
    s1.working_area = working_area.SelectedValue;

    List<member> m_list = db.return_search_member(s1);
    Table m_tbl = new Table();
    TableRow r2 = new TableRow();
    TableCell c7 = new TableCell();
    TableCell c8 = new TableCell();
    TableCell c9 = new TableCell();
    TableCell c10 = new TableCell();
    TableCell c11 = new TableCell();
    TableCell c12 = new TableCell();
    c7.Text = "תז";
    c8.Text="שם פרטי";
    c9.Text="שם משפחה";
    c10.Text="סיווג ראשי";
    c11.Text="סיווג משני";
    r2.Controls.Add(c12);
    r2.Controls.Add(c11); 
    r2.Controls.Add(c10);
    r2.Controls.Add(c9);
    r2.Controls.Add(c8);
    r2.Controls.Add(c7);
    r2.CssClass = " head_line";

    m_tbl.Controls.Add(r2);

    foreach (member m1 in m_list)
    {
        TableRow r1 = new TableRow();
        TableCell c1 = new TableCell();
        TableCell c2 = new TableCell();
        TableCell c3 = new TableCell();
        TableCell c4 = new TableCell();
        TableCell c5 = new TableCell();
        TableCell c6 = new TableCell();
        Button btn1 = new Button { Text = "עבור לכרטיס חבר", CommandArgument = "argument", ID = m1.id };
        btn1.Click += new EventHandler(btn_click);
        btn1.CssClass = "btn btn-primary";
        c1.Controls.Add(btn1);
        c2.Text = m1.prof.secondary;
        c3.Text = m1.prof.primary;
        c4.Text = m1.l_name;
        c5.Text = m1.f_name;
        c6.Text = m1.id;
        r1.Controls.Add(c1);
        r1.Controls.Add(c2);
        r1.Controls.Add(c3);
        r1.Controls.Add(c4);
        r1.Controls.Add(c5);
        r1.Controls.Add(c6);
        m_tbl.Controls.Add(r1);
    }
 search_tbl_ph.Controls.Add(m_tbl);
}
protected void btn_click(object sender, EventArgs e)
{
    Button btn = (Button)sender;
    String member_id = btn.ID;
    string qstring = "?id=" + member_id;
    Response.Redirect("member_page.aspx" + qstring);
    //Session["id"] = qstring;
}

按钮事件函数没有触发(回发问题)

        private void MakeButton()
        {
         search_category s1 = new search_category();
            s1.id = m_id.Text;
            s1.name = m_name.Text;
            s1.l_name = m_l_name.Text; 
            s1.main_cat = d_d_main.SelectedValue;
            s1.second_cat = d_d_second.SelectedValue;
            s1.working_area = working_area.SelectedValue;

            List<member> m_list = db.return_search_member(s1);
            Table m_tbl = new Table();
            TableRow r2 = new TableRow();
            TableCell c7 = new TableCell();
            TableCell c8 = new TableCell();
            TableCell c9 = new TableCell();
            TableCell c10 = new TableCell();
            TableCell c11 = new TableCell();
            TableCell c12 = new TableCell();
            c7.Text = "תז";
            c8.Text="שם פרטי";
            c9.Text="שם משפחה";
            c10.Text="סיווג ראשי";
            c11.Text="סיווג משני";
            r2.Controls.Add(c12);
            r2.Controls.Add(c11); 
            r2.Controls.Add(c10);
            r2.Controls.Add(c9);
            r2.Controls.Add(c8);
            r2.Controls.Add(c7);
            r2.CssClass = " head_line";

            m_tbl.Controls.Add(r2);

            foreach (member m1 in m_list)
            {
                TableRow r1 = new TableRow();
                TableCell c1 = new TableCell();
                TableCell c2 = new TableCell();
                TableCell c3 = new TableCell();
                TableCell c4 = new TableCell();
                TableCell c5 = new TableCell();
                TableCell c6 = new TableCell();
                Button btn1 = new Button { Text = "עבור לכרטיס חבר", CommandArgument = "argument", ID = m1.id };
                btn1.Click += new EventHandler(btn_click);
                btn1.CssClass = "btn btn-primary";
                c1.Controls.Add(btn1);
                c2.Text = m1.prof.secondary;
                c3.Text = m1.prof.primary;
                c4.Text = m1.l_name;
                c5.Text = m1.f_name;
                c6.Text = m1.id;
                r1.Controls.Add(c1);
                r1.Controls.Add(c2);
                r1.Controls.Add(c3);
                r1.Controls.Add(c4);
                r1.Controls.Add(c5);
                r1.Controls.Add(c6);
                m_tbl.Controls.Add(r1);
            }
         search_tbl_ph.Controls.Add(m_tbl);
        }
    protected void Page_Load(object sender, EventArgs e)
    {
        if(ViewState["ClickEventFired"]!=null && ViewState["ClickEventFired"]==true)
        {
           MakeButton();
        }
    }
    protected void search_Click(object sender, EventArgs e)
    {
        MakeButton();
        ViewState["ClickEventFired"]=true;
    }
    protected void btn_click(object sender, EventArgs e)
    {
        // your code
    }

你必须在Postback之后重新分配click事件。如果你有帮助，请告诉我

也许你可以使用一个简单的<a href="">链接而不是一个按钮?

否则，你可以使用按钮的OnClientClick属性，而不是OnClick事件，因为它会导致回发。

建议在Page_Init期间加载动态控件，因为我们可能希望在早期阶段将事件与适当的处理程序相关联。

protected void Page_Init(object sender, EventArgs e)
{ 
   ///code to create dynamic controls
}

Button OnClick事件只在按钮位于表单元素中时触发。

把你的HTML放到一个表单里。

我用你的代码尝试了一下，并且能够看到当用户点击按钮时search_Click被调用。

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