發生了參照完整性約束違規。當更新EF

Question

我似乎無法能夠更新與外鍵約束收到此錯誤示範：

Additional information: A referential integrity constraint violation occurred: The property value(s) of 'Country.Id' on one end of a relationship do not match the property value(s) of 'Setting.CountryId' on the other end.

設置模式

namespace Domain 
{ 
    public class Setting : BaseModel 
    { 

     public string Address { get; set; } 
     public string Email { get; set; } 
     public string Phone { get; set; } 
     public string Website { get; set; } 
     public string Slogan { get; set; } 
     public byte[] Logo { get; set; } 

     public string City { get; set; } 
     public string RegistrationNo { get; set; } 

     [ForeignKey("State")] 
     public int StateId { get; set; } 
     public State State { get; set; } 

     [ForeignKey("Country")] 
     public int CountryId { get; set; } 
     public Country Country { get; set; } 

     public string IsDefault { get; set; } 


    } 
} 

國家示範

namespace Domain 
{ 
    public class State :BaseModel 
    { 
     public string Name { get; set; } 
    } 
} 

國家模型

namespace Domain 
{ 
    public class Country : BaseModel 
    { 
     public string Name { get; set; } 
    } 
} 

庫獲取和更新設置

public Setting GetSetting() 
{ 
    try 
    { 
     return _db.Settings.Include("Country").Include("State").First(); 
    } 
    catch (Exception e) 
    { 
     Console.WriteLine(e); 
     throw; 
    } 
} 

public Setting UpdateSetting(Setting setting) 
{ 
    try 
    { 
     _db.Settings.Attach(setting); 
     _db.Entry(setting).State = EntityState.Modified; 
     _db.SaveChanges(); 

     return setting; 
    } 
    catch (Exception e) 
    { 
     Console.WriteLine(e); 
     throw; 
    } 

} 

注意我使用WCF代理

按鈕單擊事件

private void btnSave_Click(object sender, EventArgs e) 
{ 
    //MessageBox.Show(Convert.ToInt16(cmbState.EditValue).ToString()); 
    //return; 

    if (dxValidationProvider1.Validate()) 
    { 
     if (picLogo.Image == null) 
     { 
      XtraMessageBox.Show("Upload Logo"); 
     } 
     else 
     { 
      var setting = proxy.GetSetting(); 
      //MessageBox.Show(cmbState.EditValue.ToString()); return; 

      setting.HotelName = txtHotelName.Text; 
      setting.Address = txtAddress.Text; 
      setting.Email = txtEmail.Text; 
      setting.Phone = txtPhone.Text; 
      setting.Website = txtWebsite.Text; 
      setting.Slogan = txtSlogan.Text; 
      setting.City = txtCity.Text; 

      setting.CountryId = Convert.ToInt16(cmbCounty.EditValue); 

      setting.StateId = Convert.ToInt16(cmbState.EditValue)); 

      setting.Logo = picLogo.Image.ToByteArray(); 

      var s = proxy.UpdateSetting(setting); 

      MessageBox.Show(@"Updated"); 
     } 
    } 
    else 
    { 
     MessageBox.Show("Please fill the required fields"); 
    } 
} 

Answer 1

我剛剛從GetSetting刪除包含statment功能和一切更新。這解決了我的問題

public Setting GetSetting() 
{ 
    try 
    { 
     return _db.Settings.First(); 
    } 
    catch (Exception e) 
    { 
     Console.WriteLine(e); 
     throw; 
    } 
}