指定的命名连接在配置中找不到,不打算与EntityClient提供程序一起使用,或者无效

Question

我在解决方案中有两个项目.

1. PizzaSoftware.Data
2. PizzaSoftware.UI

在Data项目中,我有我的Entity Framework模型,它连接到我的数据库.

我的UI项目有一个Data的项目引用,这里是它的样子:

我在UserControls文件夹中创建了一个用户控件.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using PizzaSoftware.Data;

namespace PizzaSoftware.UI.UserControls
{
    public partial class AutoCompleteTextBox : UserControl
    {
        AutoCompleteStringCollection completeCollection = new AutoCompleteStringCollection();

        public AutoCompleteTextBox()
        {
            InitializeComponent();
        }

        private void AutoCompleteTextBox_Load(object sender, EventArgs e)
        {
            CustomerRepository repo = new CustomerRepository();
            var customers = repo.FindAllCustomers().ToList();

            foreach (var customer in customers)
            {
                completeCollection.Add(customer.Name);
            }

            txtSearchBox.AutoCompleteMode = AutoCompleteMode.Suggest;
            txtSearchBox.AutoCompleteSource = AutoCompleteSource.CustomSource;
            txtSearchBox.AutoCompleteCustomSource = completeCollection;
        }
    }
}

当我尝试将此用户控件拖到设计窗格中时,我收到问题标题中的错误.

这是我的连接字符串的样子:

<connectionStrings>
   <add 
      name="SaharaPizzaEntities"
      connectionString="
         metadata=res://*/PizzaSoftwareEntityModel.csdl|res://*/PizzaSoftwareEntityModel.ssdl|res://*/PizzaSoftwareEntityModel.msl;
         provider=System.Data.SqlClient;
         provider connection string=&quot;
            Data Source=.\SQLEXPRESS;
            Initial Catalog=SaharaPizza;
            Integrated Security=True;
            MultipleActiveResultSets=True
         &quot;"
      providerName="System.Data.EntityClient"
/>

可能导致此错误的原因是什么？

Answer 1

<connectionStrings>从PizzaSoftware.Data将App.Config从PizzaSoftware.Data 复制到web.config并添加到web.config

<assemblies>
<add assembly="System.Data.Entity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
</assemblies>

Answer 2

在您的app.config中,您的连接字符串看起来像..

   connection string="
      Data Source=.\SQLEXPRESS;
      Initial Catalog=SaharaPizza;
      Integrated Security=True;
      MultipleActiveResultSets=True
   "

请注意".尝试将其更改为单引号'