实体框架代码优先-保存时如何忽略列 [英] Entity Framework Code First - How to ignore a column when saving

问题描述

我首先使用实体​​框架代码将一个名为Client的类映射到数据库表.该表具有一个我需要在Client类中提供的计算字段，但我知道将无法写入该字段.有没有一种方法可以配置Entity Framework在保存时忽略该属性，但在读取时包括该属性?

I have a class called Client mapped to a database table using Entity Framework code first. The table has a computed field that I need available in my Client class, but I understand that it won't be possible to write to this field. Is there a way of configuring Entity Framework to ignore the property when saving, but include the property when reading?

我尝试在配置类中使用Ignore方法，或使用[NotMapped]属性，但是这些方法阻止从数据库读取该属性.

I have tried using the Ignore method in my configuration class, or using the [NotMapped] attribute, but these prevent the property from being read from the database.

推荐答案

您可以使用或者，如果您更喜欢流利的api，则可以使用DbContext类中的> HasDatabaseGeneratedOption 方法:

or if you prefer fluent api you can use HasDatabaseGeneratedOption method in your DbContext class:

public class EntitiesContext : DbContext
{
    public DbSet<EntityType> Enities { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Entity<EntityType>().Property(e => e.ComputedProperty).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Computed);
    }
}

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