Question

namespace Healthcare
{
    public class Doc
    {
        public int DocId { get; set; }
        public string DocName { get; set; }
        public string Street { get; set; }
        public int Number { get; set; }
        public string Zip { get; set; }
        public string Place { get; set; }

        public List<DocContract> DocContract { get; set; }
    }

    public class DocContract
    {
        public int DocId { get; set; }
        public string Date { get; set; }
        public Doc Doc { get; set; }
    }
}

每当我尝试启用迁移时，我都会收到以下错误消息：

Healthcare.DocContract：：EntityType'DocContract'没有定义键。定义此EntityType的密钥。

如何解决此错误？基本上每个文档都有一份合同

Answer 1

此处显示一对一关系，其中DocContract是依赖的：

public class Doc
{
    public int DocId { get; set; }
    public string DocName { get; set; }
    public string Street { get; set; }
    public int Number { get; set; }
    public string Zip { get; set; }
    public string Place { get; set; }

    public virtual DocContract DocContract { get; set; }
}

public class DocContract
{
    [Key]
    [ForeignKey("Doc")]
    public int DocId { get; set; }
    public string Date { get; set; }
    public virtual Doc Doc { get; set; }
}

启用迁移时出错

1 个答案: