小编use*_*580的帖子

我在.cs文件中有下面的代码,我遇到下面的错误,任何帮助将不胜感激.

using System.Data.Entity;

namespace Assignment2.Models
{
    public class TicketBookingEntities : DbContext
    {
        public DbSet<Performance> Performances { get; set; }
        public DbSet<Production> Productions { get; set; }
    }
}

错误:

Error   1   The type or namespace name 'Entity' does not exist in the namespace 'System.Data' (are you missing an assembly reference?)
Error   2   The type or namespace name 'DbContext' could not be found (are you missing a using directive or an assembly reference?)
Error   3   The type or namespace name 'DbSet' …

我需要帮助解决标题中显示的错误,我的代码如下所示.错误出现在这一行:

@Html.EditorForModel()

码:

@model Assignment2.Models.Order

@{
    ViewBag.Title = "Address And Payment";
} 



<script src="@Url.Content("~/Scripts/jquery.validate.min.js")" type="text/javascript"></script>
<script src="@Url.Content("~/Scripts/jquery.validate.unobtrusive.min.js")" type="text/javascript"></script>

@using (Html.BeginForm())
{

    <h2>Address And Payment</h2>
    <fieldset>
        <legend>Shipping Information</legend>

        @Html.EditorForModel()
    </fieldset> 
    <fieldset>
        <legend>Payment</legend>
        <p>We're running a promotion: all tickets free with the promo code: "FREE"</p>

        <div class="editor-label">
            @Html.Label("Promo Code")
        </div>
        <div class="editor-field">
            @Html.TextBox("PromoCode")
        </div>
    </fieldset>

<input type="submit" value="Submit Order" />
}

控制器:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Assignment2.Models;

namespace Assignment2.Controllers
{
    [Authorize]
    public class CheckoutController : …

有人可以解释一下是什么意思:

:new并:old在触发器代码中.

我是新手,所以忍受我.

我正在尝试从Movie数据库创建一个选择查询.在其他表格中,有一个Role表格,其中包含诸如此类的信息roleID, roleName, gender, actorID, movieID.演员可以在不同的电影中扮演很多角色.

我正在尝试创建查询,因此它将告诉我有多少actor在数据库中有三个或更多角色.

我尝试了一些解决方案,他们输出的数据不确定是否正确.

SELECT COUNT (DISTINCT actorID) FROM Role WHERE actorID >= 3

SELECT COUNT (actorID) FROM Role GROUP BY movieID HAVING COUNT (actorID) >=3

我在表单上有以下代码,以便用户提交表单并发送和发送电子邮件.我有两个response.write语句,我想要更改这些,以便它将这些写入标签(lblSubmit).任何帮助,将不胜感激.

<script runat="server">

    protected void Page_Load(object sender, EventArgs e)
    {


        if (IsPostBack)
        {



            SmtpClient sc = new SmtpClient("smtp.talktalk.net");
            StringBuilder sb = new StringBuilder();
            MailMessage msg = null;

            sb.Append("Email from: " + txtEmail.Text + "\n");
            sb.Append("Message   : " + txtQuestion.Text + "\n");

            try
            {
                msg = new MailMessage(txtEmail.Text,
                    "myemail@talktalk.net", "Message from Web Site",
                    sb.ToString());

                sc.Send(msg);




                Response.Write("Message sent!");

            }
            catch (Exception ex)
            {

                // something bad happened
                Response.Write("Something bad happened!");

            }
            finally
            {

                if (msg != null)
                {
                    msg.Dispose();
                }

            }

        } …

我有一个注册页面,将数据保存到数据库唯一的问题是当我点击注册按钮我收到一个错误,我不太确定如何解决,请看下面.