在asp.net中只能将一个ScriptManager实例添加到页面中

Question

当我尝试添加用户控件时,我收到了此错误

Only one instance of a ScriptManager can be added to the page 

码:

的.ascx

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="VisaUserControl.ascx.cs" Inherits="Portal.VisaUserControl" %>
<%@ Register Assembly="BasicFrame.WebControls.BasicDatePicker" Namespace="BasicFrame.WebControls" TagPrefix="dp" %>
<asp:ScriptManager ID="scriptmanager1" runat="server"></asp:ScriptManager>
<div id="divreg" runat="server">
<table id="tbl" runat="server">
    <tr>
    <td>
        <asp:Label ID="lbl2" runat="server"></asp:Label>
    </td>
</tr>
<tr>
<td> Visa Number:</td>
<td><asp:TextBox ID="txtUser" Width="160px" runat="server"/></td>
<td> Country Name:</td>
<td><asp:DropDownList ID="dropCountry" Width="165px" runat="server"></asp:DropDownList></td>
</tr>
<tr>
<td> Type of Visa:</td>
<td><asp:DropDownList ID="dropVisa" Width="165px" runat="server" OnSelectedIndexChanged="dropVisa_SelectedIndexChanged"></asp:DropDownList></td>
<td> Type of Entry:</td>
<td><asp:DropDownList ID="dropEntry" Width="165px" runat="server"></asp:DropDownList></td>
</tr>
<tr>
<td> Expiry Date</td>
    <td><asp:TextBox ID="txtDate" runat="server"></asp:TextBox>
        <ajaxToolkit:CalendarExtender ID="CalendarExtender1" runat="server" 
                          TargetControlID="txtDate" PopupButtonID="Imgbtnfromdate" Format="dd/MM/yyyy">
                      </ajaxToolkit:CalendarExtender>
    </td>
<td>
<asp:Button ID="btnRemove" Text="Remove" runat="server" OnClick="btnRemove_Click" />
</td>
</tr>
</table>
</div>

.aspx.cs

  protected override void LoadViewState(object savedState)
    {
        base.LoadViewState(savedState);

        GenerateControls();
    }



    private void GenerateControls()
    {
        foreach (string i in NoOfControls)
        {
            VisaUserControl ctrl = (VisaUserControl)Page.LoadControl("VisaUserControl.ascx");
            ctrl.ID = i;
            this.rpt1.Controls.Add(ctrl);
        }
    }

这是问题所在

    protected void btnAddVisa_Click(object sender, EventArgs e)
    {

        List<string> temp = null;
        var uc = (VisaUserControl)this.LoadControl(@"VisaUserControl.ascx");

        string id = Guid.NewGuid().ToString();
        uc.ID = id;

        temp = NoOfControls;
        temp.Add(id);
        NoOfControls = temp;
        rpt1.Controls.Add(uc);
    }

在下图中,如果单击添加按钮,我收到此错误

有任何想法吗？提前致谢

Answer 1

尝试ScriptManager从用户控件中删除.

您肯定已在.aspxPage或MasterPage中的其他位置添加了ScriptManager .检查这些页面.

<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>

如果您需要ScriptManager在母版页上,在这种情况下,不需要在userControl中有ScriptManager.遵循以下规则:

• 确保您<asp:Scriptmanager>在母版页上只有一个.
• 确保<asp:ScriptManagerProxy>在每个可能需要脚本管理器的内容页面上也有一个且只有一个

以下是MSDN关于ScriptManager控制的内容.

只能将一个ScriptManager控件实例添加到页面中.页面可以直接包含控件,也可以间接包含在嵌套组件中,例如用户控件,母版页的内容页面或嵌套母版页.如果页面已包含ScriptManager控件,但嵌套或父组件需要ScriptManager控件的其他功能,则该组件可以包含ScriptManagerProxy控件.例如,ScriptManagerProxy控件使您可以添加特定于嵌套组件的脚本和服务