找不到库hostpolicy.dll [英] The library hostpolicy.dll was not found

问题描述

我有一个简单的.NET Core项目（控制台应用程序），正在尝试编译和运行。 dotnet构建成功，但是执行 dotnet运行时出现以下错误：

I have a simple .NET Core project (console app) that I'm trying to compile and run. dotnet build succeeds, but I get the following error when I do dotnet run:

λ dotnet run
Project RazorPrecompiler (.NETCoreApp,Version=v1.0) was previously compiled. Skipping compilation.
A fatal error was encountered. The library 'hostpolicy.dll' required to execute the application was not found in [path].

我的project.json看起来像这样：

My project.json looks like this:

{
  "buildOptions": {
    "warningsAsErrors": true
  },
  "dependencies": {
    "Microsoft.AspNetCore.Razor": "1.0.0",
    "Microsoft.NETCore.App": {
      "type": "platform",
      "version": "1.0.0"
    }
  },
  "description": "Precompiles Razor views.",
  "frameworks": {
    "netcoreapp1.0": {
      "imports": [ ]
    }
  },
  "version": "1.2.0"
}

什么是 hostpolicy.dll ，为什么会丢失？

What is hostpolicy.dll, and why is it missing?

推荐答案

此错误消息无济于事。 实际问题是缺少的 emitEntryPoint 属性：

This error message is unhelpful. The actual problem is a missing emitEntryPoint property:

  "buildOptions": {
    ...
    "emitEntryPoint": true
  },

添加后，编译器将让您知道任何其他问题（例如缺少的 static void Main（）方法）。成功编译项目将产生 dotnet运行可执行的输出。

Once this is added, the compiler will let you know about any other problems (like a missing static void Main() method). Successfully compiling the project will result in an output that dotnet run can execute.

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