Entity Framework Core 自定义脚手架 [英] Entity Framework Core Customize Scaffolding

问题描述

我已经搭建了我的 SQLServer 数据库.并在指定的文件夹中创建 POCO 对象.我想做的是它从我的基类扩展而来.我也使用存储库模式，所以我需要在每个实体上都有 Id 键，我不想在每次重新构建数据库时都改变它.

I have done scaffolding of my SQLServer database. And it creates the POCO objects in the specified folder. What i would like to do is that it extends from my base class. I also use repository pattern so i need to have Id key on every entity and I don't want to change that each time i rescaffold the database.

脚手架模型示例

public partial class Food
{
     public int Id { get; set; }
     public string Name { get; set; }
     public string Description { get; set; }
     public double Price { get; set; }
}

预期结果:

public partial class Food : EntityBase
{
     public string Name { get; set; }
     public string Description { get; set; }
     public double Price { get; set; }
}

public class EntityBase : IEntityBase
{
    public int Id { get; set; }
}

推荐答案

您可以使用 DbContextWriter &EntityTypeWriter 自定义sc输出.

You can use DbContextWriter & EntityTypeWriter to customize scaffold output.

• DBContextWriter ==>> CSharpDbContextGenerator
• EntityTypeWriter ==>> CSharpEntityTypeGenerator

编写一些自定义类型编写器，您可以覆盖所有内容并获得自己的代码生成器:

Write some custom type writer, you can override everything and you will get your own code generator:

//HERE YOU CAN CHANGE THE WAY TYPES ARE GENERATED AND YOU CAN ADD INTERFACE OR BASE CLASS AS PARENT.
public class CustomEntitiyTypeWriter : EntityTypeWriter
{
    public CustomEntitiyTypeWriter([NotNull] CSharpUtilities cSharpUtilities)
        : base(cSharpUtilities)
    { }

    // Write Code returns generated code for class and you can raplec it with your base class
    public override string WriteCode([NotNull] EntityConfiguration entityConfiguration)
    {
        var classStr = base.WriteCode(entityConfiguration);

        var defaultStr = "public partial class " + entityConfiguration.EntityType.Name;
        var baseStr = "public partial class " + entityConfiguration.EntityType.Name + " : EntityBase";

        classStr = classStr.Replace(defaultStr, baseStr);

        return classStr;
    }      
}

在设置中声明:

public static void ConfigureDesignTimeServices(IServiceCollection services)
           => services.AddSingleton<EntityTypeWriter, CustomEntitiyTypeWriter>();

然后脚手架db，你可以用CustomDBContextWriter对DBContext做同样的事情.

and then scaffold db, you can do the same for DBContext with CustomDBContextWriter.

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