首页新闻找找看学习计划

ASP.NET Core 手动挡驾驶 Controller Action 遇到新问题

0
悬赏园豆:50 [已解决问题] 解决于 2019-05-21 10:50

在采用了博文 ASP.NET Core 3.0 自动挡换手动挡:在 Middleware 中执行 Controller Action 中手动执行 Action 的方法后,遇到了一个新问题,找不到放在 Razor Class Library 中的视图文件,错误信息如下:

System.InvalidOperationException: The view '500' was not found. The following locations were searched:
/Views/Errors/500.cshtml
/Views/Shared/500.cshtml
/Pages/Shared/500.cshtml
   at Microsoft.AspNetCore.Mvc.ViewEngines.ViewEngineResult.EnsureSuccessful(IEnumerable`1 originalLocations)
   at Microsoft.AspNetCore.Mvc.ViewFeatures.ViewResultExecutor.ExecuteAsync(ActionContext context, ViewResult result)
   at Microsoft.AspNetCore.Mvc.ViewResult.ExecuteResultAsync(ActionContext context)

而如果把视图文件放在 web 项目中没有这个问题,请问如何解决?

问题补充:

通过在 ASP.NET Core 源码 DefaultRazorPageFactoryProvider.CreateFactory 方法中打点

var compileTask = Compiler.CompileAsync(relativePath);
var viewDescriptor = compileTask.GetAwaiter().GetResult();
var viewType = viewDescriptor.Type;
Console.WriteLine("viewType: " + viewType);

发现出问题时 viewType 的值为 null ,正常时 viewType 的值为 AspNetCore.Views_Errors_404

dudu的主页 dudu | 高人七级 | 园豆:40744
提问于:2019-05-19 21:15

从源码看是由于 ViewResultExecutor.FindView 没有找到视图

dudu 7个月前

阅读源码找线索: ViewResult.ExecuteResultAsync() -> ViewResultExecutor.ExecuteAsync() -> CompositeViewEngine.GetView() -> RazorViewEngine.GetView() -> LocatePageFromPath() -> CreateCacheResult() -> DefaultRazorPageFactoryProvider.CreateFactory() -> DefaultViewCompiler.CompileAsync()

dudu 7个月前

对应的 debug 日志:"Initializing Razor view compiler with no compiled views"

dudu 6个月前
< >
分享
最佳答案
0

将 Razor Class Library 项目的 TargetFramework 由 netcoreapp3.0 改为 netstandard2.0 后问题解决了。

【解决后的表现】

ASP.NET Core 源码中 DefaultViewCompiler 构造函数的埋点输出为

compiledView: /Views/Errors/500.cshtml

ASP.NET Core debug 日志输出

dbug: Microsoft.AspNetCore.Mvc.Razor.Compilation.DefaultViewCompiler[3]
      Initializing Razor view compiler with compiled view: '/Views/Errors/500.cshtml'.

DefaultRazorPageFactoryProvider.CreateFactory() 中的埋点

Console.WriteLine("relativePath: " + relativePath);
Console.WriteLine("Compiler: " + Compiler);

var compileTask = Compiler.CompileAsync(relativePath);
var viewDescriptor = compileTask.GetAwaiter().GetResult();

var viewType = viewDescriptor.Type;

Console.WriteLine("viewType: " + viewType);

及输出

relativePath: /Views/Errors/500.cshtml
Compiler: Microsoft.AspNetCore.Mvc.Razor.Compilation.DefaultViewCompiler
viewType: AspNetCore.Views_Errors_500
dudu | 高人七级 |园豆:40744 | 2019-05-21 10:50

后来发现问题的真正原因是 Razor Class Library 的 .csproj 中的配置,正确的配置如下:

<Project Sdk="Microsoft.NET.Sdk.Razor">
  <PropertyGroup>
    <TargetFramework>netcoreapp3.0</TargetFramework>
    <AddRazorSupportForMvc>true</AddRazorSupportForMvc>
  </PropertyGroup>
  <ItemGroup>
    <FrameworkReference Include="Microsoft.AspNetCore.App" />
  </ItemGroup>
</Project>
dudu | 园豆:40744 (高人七级) | 2019-06-22 22:47
清除回答草稿
   您需要登录以后才能回答,未注册用户请先注册