实体类型 [英] The entity type

问题描述

我有词典

 公共类RP

    {

  public Dictionary< int， object > PDictionary {get;组; }

}

其中  对象一些我的
类

然后我有了metod  DeleteEntity

当我尝试在此metod中插入我的对象时

  var entity = rp.PDictionary [1]; //类System.Object   &NBSP; &NBSP; &NBSP; &NBSP; &NBSP;  

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; DBCommands.DeleteEntity（entity）;

   &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP;&NBSP;

  static public void DeleteEntity< TEntity>（TEntity entity）

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; TEntity：class /
$
  &NBSP; &NBSP; &NBSP; {&NBSP; &NBSP; &NBSP; &NBSP; &NBSP;   

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP;使用（var context = new ApplicationDataContext（））

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; {

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP;   

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; context.Set< TEntity>（）附加（实体）。

这里我有一个例子附加信息：实体类型Object不是当前上下文模型的一部分。我如何解释（此对象中的getType）

}}

解决方案

您好Ahlompys，

>> ; 这里我有exeption附加信息：实体类型Object不是当前上下文模型的一部分。我如何解释（此类型中的getType）

根据您的描述和相关代码，我创建了一个演示并在我身边重现您的问题，因为您定义了一个泛型参数上的
约束与方法DeleteEntity上的类 的TEntity。你需要将class 参数传递给名为  DeleteEntity而不是object的方法。请修改你的代码如下：

#RP Class

 public class RP< T>其中T：class 
 {
 public Dictionary< int，T> PDictionary {get;组; } 
} 

#Usage：

 using（var db = new ApplicationDataContext（））
 {
 var user = db.Users.Where（t => t.UserName ==" Hart"）。FirstOrDefault（）; 
 
 user.FirstName =" Test" ;; 
 
 RP< User> rp = new RP< User>（）; 
 
字典< int，用户> dic = new Dictionary< int，User>（）; 
 dic [1] = user; 
 
 rp.PDictionary = dic; 
 
 var entity = rp.PDictionary [1]; 
 
 DBCommands.DeleteEntity（entity）; 
 
} 

祝你好运，

Cole Wu

I have Dictionary

 public class RP
    {

 public Dictionary<int, object> PDictionary { get; set; }

}

where object some My classes

then I have  metod DeleteEntity

And when I try insert my object in this metod

 var entity = rp.PDictionary[1]; //class System.Object              
                DBCommands.DeleteEntity(entity);

                       

 static public void DeleteEntity<TEntity>(TEntity entity)
            where TEntity : class/
        {            
            using (var context = new ApplicationDataContext())
            {
                
                    context.Set<TEntity>().Attach(entity);

Here I have exeption Additional information: The entity type Object is not part of the model for the current context. How I can explane (getType in this object)

}}

解决方案

Hi Ahlompys,

>>Here I have exeption Additional information: The entity type Object is not part of the model for the current context. How I can explane (getType in this object)

Based on your description and related code, I create a demo and reproduce your issue on my side, Since your define a constraint on the generic parameter TEntity with class on method DeleteEntity. you need to pass class argument to method named DeleteEntity instead of object. please modify your code like this:

#RP Class

public class RP<T> where T : class
{
     public Dictionary<int, T> PDictionary { get; set; }
 }

#Usage:

using (var db = new ApplicationDataContext())
            {
                var user = db.Users.Where(t=>t.UserName == "Hart").FirstOrDefault();

                user.FirstName = "Test";

                RP<User> rp = new RP<User>();

                Dictionary<int, User> dic = new Dictionary<int, User>();
                dic[1] = user;

                rp.PDictionary = dic;

                var entity = rp.PDictionary[1]; 

                DBCommands.DeleteEntity(entity);

                            }

Best regards,

Cole Wu

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