英文:
Net Framework 4.8 EF6 EDMX T4 Error _generationEnvironment is NULL
问题
这是从一个EDMX突然不生成类文件开始的。.context.cs文件包含类声明，如下：
public virtual DbSet<myTable> myTable { get; set; }
但实际的类文件没有生成。两个.tt文件都在那里，运行“Run Custom Tool”也没有帮助。
在调试Model.tt T4模板时，这个声明：
public StringBuilder GenerationEnvironment { get { return (StringBuilder)_generationEnvironment.GetValue(_instance, null); } }
产生了以下错误：
"System.NullReferenceException: '对象引用未设置为对象的实例。'"
_generationEnvironment变量为空。
为了确保数据库更改不触发此问题，我重新创建了模型，只包含一个未被修改的表，但没有改善。
不幸的是，我没有将其迁移到Code-First和Core的余地，所以如果有任何建议，将不胜感激。
英文:
This started with an EDMX suddenly not generating class files. The .context.cs file contains the class declaration like
public virtual DbSet<myTable> myTable { get; set; }
but the actual class files are not being generated. Both .tt files are there & "Run Custom Tool" did not help.
On debugging the Model.tt T4 template this declaration:
public StringBuilder GenerationEnvironment { get { return (StringBuilder)_generationEnvironment.GetValue(_instance, null); } }
produces
> "System.NullReferenceException: 'Object reference not set to an
> instance of an object.'"
the _generationEnvironment variable is NULL.
To be sure that database changes were not triggering this I recreated the Model including only a table that had not been modified, but with no improvement.
Unfortunately I don't have the luxury of moving this to Code-First and Core so any suggestions would be gratefully received.
答案1
得分: 31
Microsoft.VisualStudio.TextTemplating.GeneratedTextTransformation.GenerationEnvironment 属性的访问权限似乎在最新更新中从非公开变为公开（即版本17.6.2）。
您可以通过修改 C:\Program Files\Microsoft Visual Studio\2022\Professional\Common7\IDE\Extensions\Microsoft\Entity Framework Tools\Templates\Includes 中的 EF.Utility.CS.ttinclude 和 EF6.Utility.CS.ttinclude 文件来修复此问题，将以下代码：
_generationEnvironment = type.GetProperty("GenerationEnvironment", BindingFlags.Instance | BindingFlags.NonPublic);
更改为：
_generationEnvironment = type.GetProperty("GenerationEnvironment", BindingFlags.Instance | BindingFlags.Public);
编辑：
看起来将在下一个 Visual Studio 版本中修复
https://github.com/dotnet/ef6tools/commit/89cd126fa8ebfd40c3b5e781232be940711cf726
英文:
The Microsoft.VisualStudio.TextTemplating.GeneratedTextTransformation.GenerationEnvironment property access appears to have changed from non public to public in the latest update (ie. 17.6.2)
You can modify the EF.Utility.CS.ttinclude and EF6.Utility.CS.ttinclude files in C:\Program Files\Microsoft Visual Studio\2022\Professional\Common7\IDE\Extensions\Microsoft\Entity Framework Tools\Templates\Includes to fix this by changing
_generationEnvironment = type.GetProperty("GenerationEnvironment", BindingFlags.Instance | BindingFlags.NonPublic);
to
_generationEnvironment = type.GetProperty("GenerationEnvironment", BindingFlags.Instance | BindingFlags.Public);
EDIT:
Looks like it will be fixed in the next VS version
https://github.com/dotnet/ef6tools/commit/89cd126fa8ebfd40c3b5e781232be940711cf726
答案2
得分: 1
同样的问题。使用Visual Studio Community 2022版本17.6.2
C:\Program Files\Microsoft Visual Studio\2022\Community\Common7\IDE\Extensions\Microsoft\Entity Framework Tools\Templates\Includes\EF6.Utility.CS.ttinclude：第1928行
编辑：回滚到17.5.3后问题已解决。
英文:
Same problem here. Using Visual Studio Community 2022 version 17.6.2
C:\Program Files\Microsoft Visual Studio\2022\Community\Common7\IDE\Extensions\Microsoft\Entity Framework Tools\Templates\Includes\EF6.Utility.CS.ttinclude:line 1928
Edit: Problem has gone after roll back to 17.5.3
答案3
得分: 1
我确实找到了与答案中相同的东西（谢谢），但是是通过绕远路找到的 - 在修复然后重新安装了VS 2022（抱歉，可能应该提到版本）但没有效果，并且找不到回滚Community版本的方法后，我重新安装了VS2019，在那里创建了.EDMX模型，没有问题。
我现在继续在VS2022中工作。希望在下一个版本中能够修复这个问题。
英文:
I did find the same thing as in the answer (thanks) in a round-about way - after repairing and then re-installing VS 2022 (pardon, could have mentioned the version) with no effect and being unable to find a way to roll back the Community version, I re-installed VS2019, created the .EDMX model there, no problems.
I'm continuing on in VS2022 now. Hopefully it gets fixed in the next release.
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论