数据注释的实体框架t4模板在哪里？

本文介绍了数据注释的实体框架t4模板在哪里？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我已经停止了这个停止2天了，找不到一个完整的，准备使用的完全实现的生成DataAnnotations的t4模板。它们是否存在？

I have been googling this non stop for 2 days now and can't find a single complete, ready to use, fully implemented t4 template that generates DataAnnotations. Do they even exist?

我使用标准的t4模板生成POCO。实际的数据库表具有描述某些验证规则的元数据，例如，不为null，nvarchar（25）等。

I generate POCOs with the standard t4 templates. The actual database table has metadata that describes some of the validation rules, eg not null, nvarchar(25), etc.

所以我想要的是一个t4模板，拿我的桌子，并用 DataAnnotations生成一个POCO ，例如

So all I want is a t4 template that can take my table and generate a POCO with DataAnnotations, eg

public class Person { [Required] [StringLength(255)] public FirstName {get;set} }

这是一个基本的基本要求，当然我不能成为全球第一个有这个要求的人？我不想在这里重新发明轮子。然而，在搜索高低的日子之后，我还没有找到它。

It is a basic and fundamental requirement, surely I can not be the first person in the entire world to have this requirement? I don't want to re-invent the wheel here. Yet I haven't found it after searching high and low for days.

这必须是可能的（希望在某个地方可以下载） - 这将是刑事的

This must be possible (and hopefully must be available somewhere to just download) - it would be criminally wrong to have to manually type in these annotations when the metadata for them already exists in the database.

推荐答案

p> 这里是你想要的！

Here is what you want!

T4元数据和数据注释模板

T4 Metadata and Data Annotations Template

此T4模板处理从Entity Framework 4模型生成元数据类，并使用数据注释属性（如[Required]和[StringLength]）来装饰属性。 [DataType] 属性也适用。它还将根据必填字段的属性名称生成 ErrorMessage值。

This T4 template handles generating metadata classes from an Entity Framework 4 model and decorates properties with data annotation attributes such as [Required] and [StringLength]. The [DataType] attribute is also applied when appropriate. It'll also generate ErrorMessage values based upon property names for required fields.