首先是实体框架代码中的错误。 [英] Error in Entity Framework code first.

问题描述

我收到这样的错误。

'System.Data.Entity.Internal.AppConfig'的类型初始化程序引发异常。



这是我的代码

 命名空间 EFfistSample 
 {
  class 程序
 {
 静态  void  Main（ string  [] args）
 {
  var  person =  new 人{FirstName =   Sreekanth ，LastName =   Vankamamidi，BirthDate = DateTime.Now}; 
 使用（ var  context =  new  MyContext（））
 {
 context.Persons.Add（person）; 
 context.SaveChanges（）; 
} 
 Console.Write（ 保存人员）; 
 Console.ReadLine（）; 
} 
} 
} 

person.cs

< pre lang =cs> 名称空间 EFfistSample
{
public class Person
{
public int PersonID { get ; set ; }
public string LastName { get ; set ; }
public string FirstName { get ; set ; }
public DateTime BirthDate { get ; set ; }

}
}

mycontext.cs

< pre lang =xml> namespace EFfistSample
{
public class MyContext：DbContext
{
public MyContext（）
{}

public DbSet < 人 > 人员{get;组; }
}
}

app.config我这样给了。

 <   configuration   >  
 <   appSettings  >  
 
 <   / appSettings  >  
 <   connectionStrings  >  
 <   add  < span class =code-attribute>   name   =  MyContext    connectionString   = 数据源=（本地）;初始目录= mydb; Integrated Security = True;    providerName   =   System.Data.SqlClient  /   >  
 <   / connectionStrings  >  
 <   configSections  >  
 <！ -    有关实体框架配置的更多信息，请访问http://go.microsoft.com/fwlink/?LinkID=237468    - >   
 <   section     name   =  entityFramework    type   =  System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection ，EntityFramework，Version = 4.4.0.0，Culture = neutral，PublicKeyToken = b77a5c561934e089    requirePermission   =  false    /  >  
 <   / configSections  >  
 <  < span class =code-leadattribute> entityFramework  >  
 <   defaultConnectionFactory     type   =   System.Data.Entity.Infrastructure.SqlConnectionFactory，EntityFramework    /  >  
 <   / entityFramework  >  
 
 <   / configuration  >  

请帮帮我



谢谢。

解决方案

尝试放置

 <   connectionStrings  >  ... <   / connectionStrings  >  <   /  

 <   configsections  >  ... <   / configsections  >  

.config file

EF连接字符串与普通连接字符串不同。请参阅： http://msdn.microsoft.com/en-us/library/bb896291.aspx [ ^ ]

我认为你在初始化一个新人时一定错过提及personId。

尝试添加它。如果没有帮助，请提供更多错误详情。

i am getting error like this.
The type initializer for 'System.Data.Entity.Internal.AppConfig' threw an exception.

here is my code

namespace EFfistSample
{
    class Program
    {
        static void Main(string[] args)
        {
            var person = new Person { FirstName = "Sreekanth", LastName = "Vankamamidi", BirthDate = DateTime.Now };
            using (var context = new MyContext())
            {
                context.Persons.Add(person);
                context.SaveChanges();
            }
            Console.Write("Person Saved");
            Console.ReadLine();
        }
    }
}

person.cs

namespace EFfistSample
{
  public class Person
    {
      public int PersonID { get; set; }
      public string LastName { get; set; }
      public string FirstName { get; set; }
      public DateTime BirthDate { get; set; }

  }
}

mycontext.cs

namespace EFfistSample
{
   public class MyContext : DbContext
    {
       public MyContext()
       { }

       public DbSet<Person> Persons { get; set; }
    }
}

app.config i have given like this.

<configuration>
  <appSettings>

  </appSettings>
  <connectionStrings>
    <add name="MyContext" connectionString="Data Source=(local); Initial Catalog=mydb; Integrated Security=True;" providerName="System.Data.SqlClient"/>
  </connectionStrings>
  <configSections>
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=4.4.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
  </configSections>
  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
  </entityFramework>

</configuration>

please help me

thank you.

解决方案

Try placing

<connectionStrings> ... </connectionStrings></

section after

<configsections> ...</configsections>

in your web.config file

The EF connection string is different from normal connection string. See: http://msdn.microsoft.com/en-us/library/bb896291.aspx[^]

I think you must have missed to mention the personId while initializing a new Person.
Try Adding it. And if it doesn't help please provide more details of error.

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