为什么在构架视图时应指定数据上下文类? [英] Why should I specify a data context class when scaffolding a view?

问题描述

使用下图所示的添加视图"对话框向ASP.NET MVC 5项目添加新视图时，我被邀请选择一个模板和一个模型类，这使我可以快速生成一个表单来创建新的实例.模型或显示模型属性的视图.但是，为什么视图应该关心数据上下文类是什么?在我的项目中，无论我是否指定数据上下文类，都会生成相同的视图，但是我猜测可能会有所不同.可能是什么?

When adding a new view to an ASP.NET MVC 5 project using the Add View dialog pictured below, I'm invited to choose a template and a model class, which allows me to quickly generate a form for creating new instances of the model or a view that displays the model's properties. But why should the view care what the data context class is? In my project, whether or not I specify the data context class, the same view is generated, but I'm guessing there's a scenario where it would make a difference. What might that be?

推荐答案

如果您引用现有的DbContext，则向导将在您的DbContext派生类中插入public DbSet<Employee> Employee { get; set; }(如果尚不存在).看起来像Visual Studio在做一些辅助工作.

If you refer to an existing DbContext then the wizard will insert public DbSet<Employee> Employee { get; set; } (if it doesn't already exist) in your DbContext derived class . Looks like Visual Studio doing some of the leg work.

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