EF。更新。唯一鍵約束

的衝突期間更新收到錯誤：EF。更新。唯一鍵約束

Violation of UNIQUE KEY constraint 'IX_UniqueClientRequest'. Cannot insert duplicate key in object 'dbo.ClientRequest'. The duplicate key value is (0067f654-a06a-47c1-a13d-d5f35530c11b, -1).

該語句已終止。

這是我使用的代碼：

public class ClientRequestData 
{ 
    public Guid Id { get; set; } 

    public ClientData Client { get; set; } 
} 

public class ClientRequestDataConfig : EntityTypeConfiguration<ClientRequestData> 
{ 
    public ClientRequestDataConfig() 
    { 
     ToTable("ClientRequest"); 

     HasRequired(r => r.Client) 
      .WithMany(c => c.ClientRequests) 
      .Map(m => m.MapKey("IdClient")) 
      .WillCascadeOnDelete(false); 
    } 
} 


public void Save(ClientRequestData request) 
    { 
     using (DbContext context = new DbContext()) 
     { 

      request.Client = context.Clients.FirstOrDefault(c => c.Id == request.Client.Id); 

      //Insert 
      if (request.Id == Guid.Empty) 
      { 
       request.Id = Guid.NewGuid(); 
       context.ClientRequests.Add(request); 
      } 
      //Update 
      else 
      { 
       ClientRequestData dbRequest = context.ClientRequests.FirstOrDefault(cr => cr.Id == request.Id); 

       dbRequest.Client = request.Client; 
      } 
      context.SaveChanges(); 
     } 
    }

如何更改客戶端實體狀態，所以它refernce僅更新，而不是試圖肌酸新的客戶端？

來源

2013-12-19 Sergejs

爲什麼實體框架重新插入現有的對象到我的數據庫？ msdn.microsoft.com/en-us/magazine/dn166926.aspx – Colin

EF。更新。唯一鍵約束

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