如何映射到和从在EF4.3代码优先的复杂类型？ [英] How do I map to and from a complex type in EF4.3 code-first?

问题描述

我有一个实体类型是这样的：

I've got a entity type like this:

public class Invoice{
    public int Id { get; set; }
    public InvoiceNumberSequence Sequence { get; set; }
    public decimal Amount { get; set; }
}

的

InvoiceNumberSequence 看起来是这样的：

public class InvoiceNumberSequence { 
    public string Prefix { get; set; }
    public int Number { get; set; }

    public string GetSequence() {
        return Prefix + Number;
    }
}

我的问题是，我有一个现有的数据库，我无法改变，我想表/列映射到我的域模型。下面是表的外观：

My problem is that I have an existing database that I cannot change and I'm trying to map tables/columns to my domain model. Here's how the table looks:

[SYSTEMINVOICES]
INVOICE_ID int
INV_TOTAL decimal
INVOICE_SEQ varchar(255)

我有一个的DbContext 像这样的：

public MyDatabaseContext : DbContext {
    public DbSet<Invoice> Invoices { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder) {
        modelBuilder.Entity<PredictedHeat>().ToTable("SYSTEMINVOICES");
        modelBuilder.Entity<Invoice>().HasKey(p => p.Id);
        modelBuilder.Entity<Invoice>().Property(p => p.Id).HasColumnName("INVOICE_ID");
        modelBuilder.Entity<Invoice>().Property(p => p.Amount).HasColumnName("INV_TOTAL");        
        //need something here to map my invoice sequence to my database table
    }
}

我需要映射InvoiceNumberSequence两个方向... 1）从数据库字段到InvoiceNumberSequence类，和2）从InvoiceNumberSequence.GetSequence（）方法来对数据库字段

I need to map the InvoiceNumberSequence both directions... 1) from the database field to the InvoiceNumberSequence class, AND 2) from the InvoiceNumberSequence.GetSequence() method to the database field.

我怎样才能做到这一点？

How can I do this?

推荐答案

所以不是某个getSequence 使用属性：

public class InvoiceNumberSequence { 
    public string Prefix { get; set; }
    public int Number { get; set; }

    public string Sequence {
        get { retrun Prefix + Number; }
        set { // Add your parsing logic }
    }
}

和映射地址：

modelBuilder.ComplexType<InvoiceNumberSequence>()
            .Property(p => p.Sequence)
            .HasColumnName("INVOICE_SEQ");
modelBuilder.ComplexType<InvoiceNumberSequence>()
            .Ignore(p => p.Prefix);
modelBuilder.ComplexType<InvoiceNumberSequence>()
            .Ignore(p => p.Number);

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