Question

Hy，我尝试使用MVC ASP.Net创建CRUD，但是当我运行程序时遇到问题，我认为问题来自于我的连接这是我的web.config

<connectionStrings>
<add name="EmployeeEntities" connectionString="metadata=res://*/Models.Employee.csdl|res://*/Models.Employee.ssdl|res://*/Models.Employee.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=(LocalDB)\MSSQLLocalDB;attachdbfilename=|DataDirectory|\Employee.mdf;integrated security=True;connect timeout=30;MultipleActiveResultSets=True;App=EntityFramework&quot;" providerName="System.Data.EntityClient" />

和我的模型EmployeeDB：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

namespace CRUDAjax.Models
{
    public class EmployeeDB
    {
        //declare connection string
        //string cs = ConfigurationManager.ConnectionStrings["EmployeeEntities"].ConnectionString;

        string cs = ConfigurationManager.ConnectionStrings["EmployeeEntities"].ConnectionString;

        //Return list of all Employees
        public List<Employee> ListAll()
        {
            List<Employee> lst = new List<Employee>();
           // SqlConnection sqlConnection1 = new SqlConnection(cs);
            using(SqlConnection con=new SqlConnection(cs))
            {
                con.Open();
                SqlCommand com = new SqlCommand("SelectEmployee",con);
                com.CommandType = CommandType.StoredProcedure;
                SqlDataReader rdr = com.ExecuteReader();
                while(rdr.Read())
                {
                    lst.Add(new Employee { 
                        EmployeeID=Convert.ToInt32(rdr["EmployeeId"]),
                        Name=rdr["Name"].ToString(),
                        Age = Convert.ToInt32(rdr["Age"]),
                        State = rdr["State"].ToString(),
                        Country = rdr["Country"].ToString(),
                    });
                }
                return lst;
            }
        }

        //Method for Adding an Employee
        public int Add(Employee emp)
        {
            int i;
            SqlConnection sqlConnection1 = new SqlConnection(cs);
            SqlConnection con = new SqlConnection(cs);
            //using (SqlConnection con=new SqlConnection(cs))
            {
                con.Open();
                SqlCommand com = new SqlCommand("InsertUpdateEmployee", con);
                com.CommandType = CommandType.StoredProcedure;
                com.Parameters.AddWithValue("@Id",emp.EmployeeID);
                com.Parameters.AddWithValue("@Name", emp.Name);
                com.Parameters.AddWithValue("@Age", emp.Age);
                com.Parameters.AddWithValue("@State", emp.State);
                com.Parameters.AddWithValue("@Country", emp.Country);
                com.Parameters.AddWithValue("@Action", "Insert");
                i = com.ExecuteNonQuery();
            }
            return i;
        }

        //Method for Updating Employee record
        public int Update(Employee emp)
        {
            int i;
            SqlConnection sqlConnection1 = new SqlConnection(cs);
            using (SqlConnection con = new SqlConnection(cs))
            {
                con.Open();
                SqlCommand com = new SqlCommand("InsertUpdateEmployee", con);
                com.CommandType = CommandType.StoredProcedure;
                com.Parameters.AddWithValue("@Id", emp.EmployeeID);
                com.Parameters.AddWithValue("@Name", emp.Name);
                com.Parameters.AddWithValue("@Age", emp.Age);
                com.Parameters.AddWithValue("@State", emp.State);
                com.Parameters.AddWithValue("@Country", emp.Country);
                com.Parameters.AddWithValue("@Action", "Update");
                i = com.ExecuteNonQuery();
            }
            return i;
        }

        //Method for Deleting an Employee
        public int Delete(int ID)
        {
            int i;
            SqlConnection sqlConnection1 = new SqlConnection(cs);
            using (SqlConnection con = new SqlConnection(cs))
            {
                con.Open();
                SqlCommand com = new SqlCommand("DeleteEmployee", con);
                com.CommandType = CommandType.StoredProcedure;
                com.Parameters.AddWithValue("@Id", ID);
                i = com.ExecuteNonQuery();
            }
            return i;
        }
    }
}

消息erorr

System.ArgumentException was unhandled by user code
  HResult=-2147024809
  Message=Keyword not supported: 'metadata'.
  Source=System.Data
  StackTrace:
       at System.Data.Common.DbConnectionOptions.ParseInternal(Hashtable parsetable, String connectionString, Boolean buildChain, Hashtable synonyms, Boolean firstKey)
       at System.Data.Common.DbConnectionOptions..ctor(String connectionString, Hashtable synonyms, Boolean useOdbcRules)
       at System.Data.SqlClient.SqlConnectionString..ctor(String connectionString)
       at System.Data.SqlClient.SqlConnectionFactory.CreateConnectionOptions(String connectionString, DbConnectionOptions previous)
       at System.Data.ProviderBase.DbConnectionFactory.GetConnectionPoolGroup(DbConnectionPoolKey key, DbConnectionPoolGroupOptions poolOptions, DbConnectionOptions& userConnectionOptions)
       at System.Data.SqlClient.SqlConnection.ConnectionString_Set(DbConnectionPoolKey key)
       at System.Data.SqlClient.SqlConnection.set_ConnectionString(String value)
       at System.Data.SqlClient.SqlConnection..ctor(String connectionString, SqlCredential credential)
       at System.Data.SqlClient.SqlConnection..ctor(String connectionString)
       at CRUDAjax.Models.EmployeeDB.ListAll() in C:\Users\Jujur\Documents\CRUDAjax\CRUDAjax\Models\EmployeeDB.cs:line 24
       at CRUDAjax.Controllers.HomeController.List() in C:\Users\Jujur\Documents\CRUDAjax\CRUDAjax\Controllers\HomeController.cs:line 20
       at lambda_method(Closure , ControllerBase , Object[] )
       at System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters)
       at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters)
       at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
       at System.Web.Mvc.Async.AsyncControllerActionInvoker.<BeginInvokeSynchronousActionMethod>b__39(IAsyncResult asyncResult, ActionInvocation innerInvokeState)
       at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`2.CallEndDelegate(IAsyncResult asyncResult)
       at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.End()
       at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult)
       at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3d()
       at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f()
  InnerException:

ScreenShoot Erorr

Answer 1

您应该尝试更新连接字符串。

首先在项目中连接数据库，如本

所述

添加数据库后，您可以从数据库的属性中获取连接字符串。您可以将该连接字符串添加到webconfig。

Answer 2

发生此异常只是因为您提供实体框架的连接字符串可能已经在同一项目中使用了实体框架，这就是Entity Framework连接字符串出现的原因

connectionString="metadata=res://

另请注意此部分，以确认您已使用EF

App=EntityFramework&quot;" providerName="System.Data.EntityClient"

使用ADO.NET的连接字符串将是这样的：

<add name="DefaultConnection" connectionString="Data Source=(LocalDb)\v11.0;Initial Catalog=SampleDB;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|\SampleDB.mdf" providerName="System.Data.SqlClient" />

转到SQL Server或其本地数据库中的数据库，右键单击它，转到属性，复制连接字符串并将其替换为web.config中的连接字符串，清除解决方案并构建将起作用。

不支持ASP MVC CRUD Erorr关键字：＆＃39;元数据＆＃39;。

2 个答案: