如何使用Entity Framework Code First 4.1映射小對象圖？

Question

我有一個非常小的對象圖，我使用：

public struct Address 
{ 
    public string AddressLine1 { get; set; } 
    public string AddressLine2 { get; set; } 
    etc... 
} 

public class User 
{ 
    public Address HomeAddress { get; set; } 
    public Address WorkAddress { get; set; } 
    public string FirstName { get; set; } 
    etc... 
} 

使用實體框架4.1，我怎麼會變成這樣的結構映射到一個表，以便他們映射成列，如：

HomeAddressLine1 
HomeAddressLine2 
WorkAddressLine1 
WorkAddressLine2 
FirstName 
LastName 
etc... 

Answer 1

EF不支持結構。您必須爲您的地址使用類並將其映射爲複雜類型：

public class Address 
{ 
    public string AddressLine1 { get; set; } 
    public string AddressLine2 { get; set; } 
} 

public class User 
{ 
    public int Id { get; set; } 
    public Address HomeAddress { get; set; } 
    public Address WorkAddress { get; set; } 
    public string FirstName { get; set; } 
} 


public class Context : DbContext 
{ 
    protected override void OnModelCreating(DbModelBuilder modelBuilder) 
    { 
     modelBuilder.Entity<User>() 
        .Property(u => u.HomeAddress.AddressLine1) 
        .ColumnName("HomeAddressLine1"); 
     // Use the same pattern for all columns of HomeAddress and WorkAddress 
    } 
}