无法在.NET Core项目中使用T4模板 [英] Cannot use T4 templates inside a .NET Core project

问题描述

我有一个.NET Core类库项目，并且我想使用设计时T4模板。

I have a .NET Core class library project and I want to use design-time T4 templates.

tempalate可以正确编译，但是当我尝试使用Reflection时会引发错误

The tempalate compiles correctly, but when I try to use Reflection it raises an error

Running transformation: System.IO.FileNotFoundException: Could not load file or assembly 'System.Runtime, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.
File name: 'System.Runtime, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
   at Microsoft.VisualStudio.TextTemplating91FD7CCD92D7361F64265F0C5C220E81E842FC4A778C4D459155BDB3A79CCB52D465743E28886D98FF13456BEB0A44361D5237CFADD6B4BDEEED323B315D2F62.GeneratedTextTransformation.TransformText()
   at System.Dynamic.UpdateDelegates.UpdateAndExecute1[T0,TRet](CallSite site, T0 arg0)
   at CallSite.Target(Closure , CallSite , Object )
   at Microsoft.VisualStudio.TextTemplating.TransformationRunner.PerformTransformation()

这是我的代码：

<#@ output extension=".cs" hostspecific="false" #>
<#@ assembly name="$(TargetDir)$(Configuration)\netstandard1.6\MyProject.dll" #>
<#@ import namespace="System" #>
<#@ import namespace="System.Reflection" #>

<#@ import namespace="MyProject" #>

using System;
using System.Reflection;
namespace MyProject
{
    public class TestClass
    {
        public static void Method()
        {
            <#
                var type = typeof(Product);
                var properties = type.GetRuntimeProperties();
                // use properties here...

            #>
        }   
    }
}

我添加了对System的引用使用Nuget的Runtime 4.1。

I have added references to System.Runtime 4.1 using Nuget.

推荐答案

问题的原因不是 System.Reflection的使用，但是您对库 MyProject.dll 的引用。

The cause of the problem is not the usage of System.Reflection, but your reference to the library MyProject.dll.

T4模板引擎无法引用针对.NET平台标准的库。要引用您的库，您需要在项目中添加.NET Framework的目标（例如，.NET Framework 4.5.1的 net451 ）。所引用库的json 。

The T4 template engine is not able to reference libraries targeting the .NET Platform Standard. To reference your library, you need to add a target for the .NET Framework (e.g. net451 for .NET Framework 4.5.1) in the project.json of the referenced library.

"frameworks": {
    "net451": {},
    "netstandard1.6": {
        "imports": "dnxcore50"
    }

然后将模板中的引用更改为添加的目标框架。

Then change the reference in your template to the added target framework.

<#@ assembly name="$(TargetDir)$(Configuration)\netstandard1.6\MyProject.dll" #>

成为

<#@ assembly name="$(TargetDir)$(Configuration)\net451\MyProject.dll" #>

这篇关于无法在.NET Core项目中使用T4模板的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！