异常 - ReferentialConstraint中的依赖属性映射到存储生成的列。专栏：'Id'

时间：2015-03-30 18:13:06

标签： c# entity-framework ef-code-first ef-fluent-api

好的，这就是情况。我遇到了一个奇怪的异常，并且在stackoverflow上通过其他各种答案我已经发现它必须与我的项目之间的映射有关-entity和图像实体的一对一关系。尽管如此，我仍然无法弄清楚错误的确切原因是什么。

到目前为止，我已经阅读了这些答案，但遗憾的是它们都没有帮助我解决错误。我猜它一定是非常小而愚蠢的事情。

这是我得到的确切错误 enter image description here

我的整个模型是使用代码优先迁移创建的，并且我最近从数据注释更改为流畅映射。我已经让MVC根据我的DTO设置了一个简单的索引，创建和编辑视图。我的想法是，我可以创建一个与至少一个＆＃39; Portfolio＆＃39;相关的项目。和一个或多个图像。

Project.cs 

public class Project : BaseEntity
{
    public DateTime StartDate { get; set; }

    public DateTime? EndDate { get; set; }

    public String Title { get; set; }

    public String ShortDescription { get; set; }

    public String Description { get; set; }

    public Guid? LargeImageId { get; set; }
    public Image LargeImage { get; set; }

    public Guid? MediumImageId { get; set; }
    public Image MediumImage { get; set; }

    public Guid SmallImageId { get; set; }
    public Image SmallImage { get; set; }

    public Guid PortfolioId { get; set; }
    public virtual Portfolio Portfolio { get; set; }
}

Portfolio.cs 

public class Portfolio : BaseEntity
{
    public String Name { get; set; }

    public virtual List<Project> Projects { get; set; }
}

Image.cs 

public class Image : BaseEntity
{
    public Int32 Width { get; set; }
    public Int32 Height { get; set; }
    public String Title { get; set; }
    public String MimeType { get; set; }
    public String Extension { get; set; }
    public String Filename { get; set; }

    public Guid FileContentId { get; set; }
    public virtual ImageContent FileContent { get; set; }
}

ImageContent.cs 

public class ImageContent
{
    //[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public Guid Id { get; set; }

    public byte[] Content { get; set; }
}

这是使用的所有实体对象。我使用automapper将属性从DTO映射到实体对象。但您可以假设所有DTO的属性与实体对象中的属性完全相同。

然后使用以下类来映射实体对象，这些类在上下文中加载。

ProjectMap.cs 

 public class ProjectMap : BaseEntityTypeConfiguration<Project>
{
    public ProjectMap()
    {
        //Primary key
        HasKey(t => t.Id);

        //Map schema name and table
        ToTable("Project", SchemaConstants.Component);

        //Set property mapping explicit if needed
        Property(t => t.StartDate).IsRequired();
        Property(t => t.EndDate).IsOptional();
        Property(t => t.Title).HasMaxLength(150).IsRequired();
        Property(t => t.ShortDescription).HasMaxLength(200).IsOptional();
        Property(t => t.Description).IsRequired().HasColumnType("nvarchar(max)");

        //Foreign key relationships
        HasRequired(t => t.SmallImage).WithMany().HasForeignKey(t => t.SmallImageId).WillCascadeOnDelete(true);
        HasOptional(t => t.MediumImage).WithMany().HasForeignKey(t => t.MediumImageId).WillCascadeOnDelete(false);
        HasOptional(t => t.LargeImage).WithMany().HasForeignKey(t => t.LargeImageId).WillCascadeOnDelete(false);
        HasRequired(t => t.Portfolio).WithMany().HasForeignKey(t => t.PortfolioId).WillCascadeOnDelete(false);

        //Other constraints
    }
}

PortfolioMap.cs 

public class PortfolioMap : BaseEntityTypeConfiguration<Portfolio>
{
    public PortfolioMap()
    {
        //Primary key
        HasKey(t => t.Id);

        //Map schema name and table
        ToTable("Portfolio", SchemaConstants.Component);

        //Set property mapping explicit if needed
        Property(t => t.Name).HasMaxLength(150).IsRequired();

        //Foreign key relationships
        HasRequired(t => t.Projects).WithRequiredPrincipal();

        //Other constraints
    }
}

ImageMap.cs 

 public class ImageMap : BaseEntityTypeConfiguration<Image>
{
    public ImageMap()
    {
        //Primary key
        HasKey(t => t.Id);

        //Map schema name and table
        ToTable("Image", SchemaConstants.Systeem);

        //Set property mapping explicit if needed
        Property(t => t.Width).IsRequired();
        Property(t => t.Height).IsRequired();
        Property(t => t.Title).HasMaxLength(150).IsRequired();
        Property(t => t.MimeType).HasMaxLength(150).IsRequired();
        Property(t => t.Extension).HasMaxLength(15).IsRequired();
        Property(t => t.Filename).HasMaxLength(255).IsRequired();

        //Foreign key relationships
        HasRequired(t => t.FileContent).WithMany().HasForeignKey(t => t.FileContentId).WillCascadeOnDelete(true);

        //Other constraints
    }
}

ImageContentMap.cs 

 public class ImageContentMap : EntityTypeConfiguration<ImageContent>
{
    public ImageContentMap()
    {
        //Primary key
        HasKey(t => t.Id);

        //Map schema name and table
        ToTable("ImageContent", SchemaConstants.Systeem);

        //Set property mapping explicit if needed
        Property(t => t.Content).IsRequired();

        //Foreign key relationships

        //Other constraints
    }
}

BaseEntityTypeConfiguration.cs 

public class BaseEntityTypeConfiguration<T> : EntityTypeConfiguration<T> where T : BaseEntity
{
    public BaseEntityTypeConfiguration()
    {
        Property(t => t.TimeStamp).IsRowVersion().IsConcurrencyToken();
        Property(t => t.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
        Property(t => t.PublishStart).IsRequired();
        Property(t => t.PublishEnd).IsOptional();
        Property(t => t.DateCreated).IsRequired();
        Property(t => t.DateDeleted).IsOptional();
        Property(t => t.IsPublished).IsRequired();
        Property(t => t.IsDeleted).IsRequired();

        Property(t => t.SystemName).HasMaxLength(150).IsRequired();
    }
}

希望有人可以帮我解决这个问题。现在这让我疯了！对于保存新项目的其他对象，可以正常工作。但是当通过界面创建一个新项目时，所有我得到的是带有此错误的DbUpdateException; 

A dependent property in a ReferentialConstraint is mapped to a store-generated column. Column: 'Id'

有人可以帮我解决这个问题吗？

1 个答案:

答案 0 :(得分：0)

终于解决了问题！我的一位同事给了我一个暗示，关于映射到正确的id。所以我检查了project.cs周围的所有关系

项目属于名为投资组合的项目。这背后的想法是，您可以创建一个或多个包含项目的投资组合。投资组合类的映射看起来像这样; 

public class PortfolioMap : BaseEntityTypeConfiguration<Portfolio>
{
    public PortfolioMap()
    {
        //Primary key
        HasKey(t => t.Id);

        //Map schema name and table
        ToTable("Portfolio", SchemaConstants.Component);

        //Set property mapping explicit if needed
        Property(t => t.Name).HasMaxLength(150).IsRequired();

        //Foreign key relationships
         HasRequired(t => t.Projects).WithRequiredPrincipal(); <<--- Line causing the error

        //Other constraints
    }
}

删除奇怪的HasRequired解决了这个问题。

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