我正在尝试创建一个 webpage ，但是当我创建 button并添加 method给它一个compilation error occurs ，当我删除 method从按钮它工作正常
我尝试了这些步骤

  Server Error in '/' Application.

    Compilation Error

Compiler Error Message: CS1061: 'ASP.usermodification_aspx' does not contain a definition for 'btnModify_Click' and no extension method 'btnModify_Click' accepting a first argument of type 'ASP.usermodification_aspx' could be found (are you missing a using directive or an assembly reference?)

    Source Error:


        Line 38:         SelectCommand="SELECT RoleName FROM aspnet_Roles"></asp:SqlDataSource>
        Line 39:     <br />
        Line 40:     <asp:Button ID="btnModify" runat="server" Text="Modify" 
        Line 41:         onclick="btnModify_Click" />
        Line 42: 

namespace RentACar
 {
    public partial class UserModification : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void btnModify_Click(object sender, EventArgs e)
        {
            GridViewRow row = gvUserRoles.SelectedRow;

            string username = row.Cells[0].Text;
             string role = row.Cells[1].Text;
             Roles.RemoveUserFromRole(username, role);
            string choosenrole = dllUserRoles.SelectedValue.ToString();
            Roles.AddUserToRole(username, choosenrole);

        }
    }
}`

      <%@ Page Title="" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="UserModification.aspx.cs" Inherits="RentACar.UserModification" %>
<asp:Content ID="Content3" ContentPlaceHolderID="HeadContent" runat="server">

 <asp:Button ID="btnModify" runat="server" Text="Modify" 
        onclick="btnModify_Click" />

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.Security;

最佳答案

尝试使用 CodeFile而不是 CodeBehind在页面标签中。 CodeBehind 需要编译解决方案。您的代码可能有问题。在页面标签中使用 CodeFile 属性后，在您的按钮事件处理程序上放置一个断点，看看您是否仍然收到该错误。

https://stackoverflow.com/questions/10462833/