Entity Framework - 如何修复 "Violation of PRIMARY KEY constraint" 错误？

Question

我有 class，其中 Team Home 和 Team Guest 存在另一个 class。

public class Match
{
    [DataMember]
    public Guid Id { get; set; }
    [DataMember]
    public virtual Tour Tour { get; set; }

    [DataMember]
    public DateTime DateMatch { get; set; }

    [DataMember]
    public virtual Team Home { get; set; }
    [DataMember]
    public virtual Team Guest { get; set; }

    [DataMember]
    public virtual Result Result { get; set; }
}

当我尝试添加 Match:

Violation of PRIMARY KEY constraint 'PK_dbo.Teams'. Cannot insert duplicate key in object 'dbo.Teams'. The duplicate key value is (06f67648-f904-4a4e-8ceb-33c204d8267c). The statement has been terminated.

我不知道如何在 Teams 已经存在的地方添加匹配项

Answer 1

正如@DevilSuichiro 正确提到的那样，您不需要填写导航属性。像这样为所有导航属性添加外键：

public virtual int HomeId { get; set; }

[DataMember]
[ForeignKey("HomeId")]
public virtual Team Home { get; set; }

然后当你需要添加一个新的 Match 时，只需填充 HomeId 并将 Home 属性设置为 null 这样它就不会被重新添加到数据库中。

Entity Framework - 如何修复 "Violation of PRIMARY KEY constraint" 错误？

Entity Framework - How to fix the "Violation of PRIMARY KEY constraint" error?

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