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public class Song
    {
        public int SongID { get; set; }
        public string URL { get; set; }
        public virtual TagLib.Tag SongInfo { get; set; }
    }

我想在我的 Song 实体中使用“TagLib.Tag”数据类型。当我尝试启用迁移时，我得到：

One or more validation errors were detected during model generation:

\tSystem.Data.Entity.Edm.EdmEntityType: : EntityType 'XmpNode' has no key defined. Define the key for this EntityType.
\tSystem.Data.Entity.Edm.EdmEntitySet: : The referenced EntitySet 'Tags' for End 'CombinedImageTag_Exif_Source' could not be found in the containing EntityContainer.
\tSystem.Data.Entity.Edm.EdmEntitySet: : The referenced EntitySet 'Tags' for End 'CombinedImageTag_Exif_Target' could not be found in the containing EntityContainer.
\tSystem.Data.Entity.Edm.EdmEntitySet: : The referenced EntitySet 'Tags' for End 'XmpTag_NodeTree_Source' could not be found in the containing EntityContainer.
\tSystem.Data.Entity.Edm.EdmEntitySet: : The referenced EntitySet 'Tags' for End 'CombinedImageTag_Xmp_Source' could not be found in the containing EntityContainer.
\tSystem.Data.Entity.Edm.EdmEntitySet: : The referenced EntitySet 'Tags' for End 'CombinedImageTag_Xmp_Target' could not be found in the containing EntityContainer.
\tSystem.Data.Entity.Edm.EdmEntitySet: : The referenced EntitySet 'Tags' for End 'CombinedImageTag_OtherTags_Source' could not be found in the containing EntityContainer.
\tSystem.Data.Entity.Edm.EdmEntitySet: : The referenced EntitySet 'Tags' for End 'CombinedImageTag_OtherTags_Target' could not be found in the containing EntityContainer.
\tSystem.Data.Entity.Edm.EdmEntitySet: : The referenced EntitySet 'Tags' for End 'CombinedImageTag_AllTags_Source' could not be found in the containing EntityContainer.
\tSystem.Data.Entity.Edm.EdmEntitySet: : The referenced EntitySet 'Tags' for End 'CombinedImageTag_AllTags_Target' could not be found in the containing EntityContainer.
\tSystem.Data.Entity.Edm.EdmEntitySet: EntityType: EntitySet 'XmpNodes' is based on type 'XmpNode' that has no keys defined.
\tSystem.Data.Entity.Edm.EdmEntitySet: EntityType: EntitySet 'Tags' is based on type 'Tag' that has no keys defined.

如何在我的模型中使用外部复杂数据类型？

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1 回答 1

0

我看到关于 Tag 实体类的错误，您没有为此 Key 属性定义。

也许您的代码如下：

public class Tag
{
    public string TagName{get; set;}
    // other fields
}

您必须按如下方式更改它：

public class Tag
{
    [Key]
    public int TagId{get; set;}
    public string TagName{get; set;}
    // other fields
}
于 2013-08-13T05:50:11.727 回答