在.net核心控制台应用程序中使用.net类库时，项目构建失败 [英] Project build failed while using .net class library in .net core console application

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本文介绍了在.net核心控制台应用程序中使用.net类库时，项目构建失败的处理方法，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

我有.Net Core 3.1控制台应用程序，它引用了作为参考添加的类库项目FxCore. 类库csproj的<TargetFrameworks>net45;net451;net452;net46;net461;net462;net47;net471;net472</TargetFrameworks>我尝试将其更改为<TargetFrameworks>net45;</TargetFrameworks>，但仍然遇到相同的错误.

I have .Net Core 3.1 console application which is referring to a class library project FxCore which is added as a reference. class library csproj has <TargetFrameworks>net45;net451;net452;net46;net461;net462;net47;net471;net472</TargetFrameworks> I have tried changing it to <TargetFrameworks>net45;</TargetFrameworks>, but still getting the same error.

我收到以下错误.，我尝试了清理->重建并重新打开Visual Studio 2019(版本16.5.2)

I am getting the below error., I have tried clean -> ReBuild, Reopen the visual studio 2019 (version 16.5.2)

1> ------构建开始:项目:FxCore，配置:调试任何CPU ------ 1> J:\ Test \ core \ fx-core \ FxCore.csproj(3,3):警告MSB4011:" C:\ Program Files(x86)\ Microsoft Visual Studio \ 2019 \ Professional \ MSBuild \ Current \ Microsoft.Common.props 无法再次导入.它已经在"C:\ Program"中导入 文件\ dotnet \ sdk \ 3.1.201 \ Sdks \ Microsoft.NET.Sdk \ Sdk \ Sdk.props(40,3)". 这很可能是构建创作错误.此后的导入 将被忽略. 1> C:\ Program 文件\ dotnet \ sdk \ 3.1.201 \ Sdks \ Microsoft.NET.Sdk \ Sdk \ Sdk.targets(37,3): 警告MSB4011:" C:\ Program Files(x86)\ Microsoft Visual Studio \ 2019 \ Professional \ MSBuild \ Current \ Bin \ Microsoft.CSharp.targets 无法再次导入.它已经在进口 "J:\ Test \ core \ fx-core \ FxCore.csproj(120,3)".这很可能是 生成创作错误.随后的导入将被忽略. 1> C:\ Program Files(x86)\ Microsoft Visual Studio \ 2019 \ Professional \ MSBuild \ Current \ Bin \ Microsoft.Common.CurrentVersion.targets(2081,5): 警告MSB3245:无法解析此引用.找不到 程序集"FXEntity，版本= 1.0.1.12，文化=中性， ProcessorArchitecture ＝ MSIL".检查以确保程序集存在于 磁盘.如果您的代码需要此引用，则可能会得到 编译错误. 1> FxCore-> J:\ Test \ core \ fx-core \ bin \ Debug \ FxCore.dll 1> J:\ Test \ core \ fx-core \ FxCore.csproj(3,3):警告MSB4011: " C:\ Program Files(x86)\ Microsoft Visual Studio \ 2019 \ Professional \ MSBuild \ Current \ Microsoft.Common.props 无法再次导入.它已经在"C:\ Program"中导入 文件\ dotnet \ sdk \ 3.1.201 \ Sdks \ Microsoft.NET.Sdk \ Sdk \ Sdk.props(40,3)". 这很可能是构建创作错误.此后的导入 将被忽略. 1> C:\ Program 文件\ dotnet \ sdk \ 3.1.201 \ Sdks \ Microsoft.NET.Sdk \ Sdk \ Sdk.targets(37,3): 警告MSB4011:" C:\ Program Files(x86)\ Microsoft Visual Studio \ 2019 \ Professional \ MSBuild \ Current \ Bin \ Microsoft.CSharp.targets 无法再次导入.它已经在进口 "J:\ Test \ core \ fx-core \ FxCore.csproj(120,3)".这很可能是 生成创作错误.随后的导入将被忽略. 1> J:\ Test \ core \ fx-core \ FxCore.csproj(3,3):警告MSB4011: " C:\ Program Files(x86)\ Microsoft Visual Studio \ 2019 \ Professional \ MSBuild \ Current \ Microsoft.Common.props 无法再次导入.它已经在"C:\ Program"中导入 文件\ dotnet \ sdk \ 3.1.201 \ Sdks \ Microsoft.NET.Sdk \ Sdk \ Sdk.props(40,3)". 这很可能是构建创作错误.此后的导入 将被忽略. 1> C:\ Program 文件\ dotnet \ sdk \ 3.1.201 \ Sdks \ Microsoft.NET.Sdk \ Sdk \ Sdk.targets(37,3): 警告MSB4011:" C:\ Program Files(x86)\ Microsoft Visual Studio \ 2019 \ Professional \ MSBuild \ Current \ Bin \ Microsoft.CSharp.targets 无法再次导入.它已经在进口 "J:\ Test \ core \ fx-core \ FxCore.csproj(120,3)".这很可能是 生成创作错误.随后的导入将被忽略. 1> J:\ Test \ core \ fx-core \ FxCore.csproj:警告NU1603:FxCore取决于 在Microsoft.Practices.ServiceLocation(> = 1.3.0)上，但是 找不到Microsoft.Practices.ServiceLocation 1.3.0.一个 Microsoft.Practices.ServiceLocation 1.4.11的近似最佳匹配 解决了. 1>完成的构建项目"FxCore.csproj". 1>完成的建筑物 项目"FxCore.csproj". 2> -------构建已开始:项目: CoreConsoleApp，配置:调试任何CPU ------ 2> J:\ Test \ core \ fx-core \ FxCore.csproj(3,3):警告MSB4011: " C:\ Program Files(x86)\ Microsoft Visual Studio \ 2019 \ Professional \ MSBuild \ Current \ Microsoft.Common.props 无法再次导入.它已经在"C:\ Program"中导入 文件\ dotnet \ sdk \ 3.1.201 \ Sdks \ Microsoft.NET.Sdk \ Sdk \ Sdk.props(40,3)". 这很可能是构建创作错误.此后的导入 将被忽略. 2> C:\ Program 文件\ dotnet \ sdk \ 3.1.201 \ Sdks \ Microsoft.NET.Sdk \ Sdk \ Sdk.targets(37,3): 警告MSB4011:" C:\ Program Files(x86)\ Microsoft Visual Studio \ 2019 \ Professional \ MSBuild \ Current \ Bin \ Microsoft.CSharp.targets 无法再次导入.它已经在进口 "J:\ Test \ core \ fx-core \ FxCore.csproj(120,3)".这很可能是 生成创作错误.随后的导入将被忽略. 2> C:\ Program Files(x86)\ Microsoft Visual Studio \ 2019 \ Professional \ MSBuild \ Current \ Bin \ Microsoft.Common.CurrentVersion.targets(1655,5): 警告NU1702:ProjectReference'J:\ Test \ core \ fx-core \ FxCore.csproj' 已使用".NETFramework，Version = v4.6.1"而不是 项目目标框架'.NETCoreApp，Version = v3.1'.该项目可能 与您的项目不完全兼容. 2> J:\ Test \ core \ CoreConsoleApp \ Program.cs(2,7,2,9):错误CS0246: 找不到类型或名称空间名称"FX"(您是否缺少 使用指令还是程序集引用?) 2> J:\ Test \ core \ CoreConsoleApp \ Program.cs(7、24、7、32):错误CS0246: 类型或名称空间名称'FxCommon'找不到(您是否丢失了 使用指令还是程序集引用?)2>完成的建筑项目 "CoreConsoleApp.csproj"； - 失败的. ===========构建:1个成功，1个失败，0个最新，0个跳过==========

1>------ Build started: Project: FxCore, Configuration: Debug Any CPU ------ 1>J:\Test\core\fx-core\FxCore.csproj(3,3): warning MSB4011: "C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\MSBuild\Current\Microsoft.Common.props" cannot be imported again. It was already imported at "C:\Program Files\dotnet\sdk\3.1.201\Sdks\Microsoft.NET.Sdk\Sdk\Sdk.props (40,3)". This is most likely a build authoring error. This subsequent import will be ignored. 1>C:\Program Files\dotnet\sdk\3.1.201\Sdks\Microsoft.NET.Sdk\Sdk\Sdk.targets(37,3): warning MSB4011: "C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\MSBuild\Current\Bin\Microsoft.CSharp.targets" cannot be imported again. It was already imported at "J:\Test\core\fx-core\FxCore.csproj (120,3)". This is most likely a build authoring error. This subsequent import will be ignored. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\MSBuild\Current\Bin\Microsoft.Common.CurrentVersion.targets(2081,5): warning MSB3245: Could not resolve this reference. Could not locate the assembly "FXEntity, Version=1.0.1.12, Culture=neutral, processorArchitecture=MSIL". Check to make sure the assembly exists on disk. If this reference is required by your code, you may get compilation errors. 1>FxCore -> J:\Test\core\fx-core\bin\Debug\FxCore.dll 1>J:\Test\core\fx-core\FxCore.csproj(3,3): warning MSB4011: "C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\MSBuild\Current\Microsoft.Common.props" cannot be imported again. It was already imported at "C:\Program Files\dotnet\sdk\3.1.201\Sdks\Microsoft.NET.Sdk\Sdk\Sdk.props (40,3)". This is most likely a build authoring error. This subsequent import will be ignored. 1>C:\Program Files\dotnet\sdk\3.1.201\Sdks\Microsoft.NET.Sdk\Sdk\Sdk.targets(37,3): warning MSB4011: "C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\MSBuild\Current\Bin\Microsoft.CSharp.targets" cannot be imported again. It was already imported at "J:\Test\core\fx-core\FxCore.csproj (120,3)". This is most likely a build authoring error. This subsequent import will be ignored. 1>J:\Test\core\fx-core\FxCore.csproj(3,3): warning MSB4011: "C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\MSBuild\Current\Microsoft.Common.props" cannot be imported again. It was already imported at "C:\Program Files\dotnet\sdk\3.1.201\Sdks\Microsoft.NET.Sdk\Sdk\Sdk.props (40,3)". This is most likely a build authoring error. This subsequent import will be ignored. 1>C:\Program Files\dotnet\sdk\3.1.201\Sdks\Microsoft.NET.Sdk\Sdk\Sdk.targets(37,3): warning MSB4011: "C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\MSBuild\Current\Bin\Microsoft.CSharp.targets" cannot be imported again. It was already imported at "J:\Test\core\fx-core\FxCore.csproj (120,3)". This is most likely a build authoring error. This subsequent import will be ignored. 1>J:\Test\core\fx-core\FxCore.csproj : warning NU1603: FxCore depends on Microsoft.Practices.ServiceLocation (>= 1.3.0) but Microsoft.Practices.ServiceLocation 1.3.0 was not found. An approximate best match of Microsoft.Practices.ServiceLocation 1.4.11 was resolved. 1>Done building project "FxCore.csproj". 1>Done building project "FxCore.csproj". 2>------ Build started: Project: CoreConsoleApp, Configuration: Debug Any CPU ------ 2>J:\Test\core\fx-core\FxCore.csproj(3,3): warning MSB4011: "C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\MSBuild\Current\Microsoft.Common.props" cannot be imported again. It was already imported at "C:\Program Files\dotnet\sdk\3.1.201\Sdks\Microsoft.NET.Sdk\Sdk\Sdk.props (40,3)". This is most likely a build authoring error. This subsequent import will be ignored. 2>C:\Program Files\dotnet\sdk\3.1.201\Sdks\Microsoft.NET.Sdk\Sdk\Sdk.targets(37,3): warning MSB4011: "C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\MSBuild\Current\Bin\Microsoft.CSharp.targets" cannot be imported again. It was already imported at "J:\Test\core\fx-core\FxCore.csproj (120,3)". This is most likely a build authoring error. This subsequent import will be ignored. 2>C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\MSBuild\Current\Bin\Microsoft.Common.CurrentVersion.targets(1655,5): warning NU1702: ProjectReference 'J:\Test\core\fx-core\FxCore.csproj' was resolved using '.NETFramework,Version=v4.6.1' instead of the project target framework '.NETCoreApp,Version=v3.1'. This project may not be fully compatible with your project. 2>J:\Test\core\CoreConsoleApp\Program.cs(2,7,2,9): error CS0246: The type or namespace name 'FX' could not be found (are you missing a using directive or an assembly reference?) 2>J:\Test\core\CoreConsoleApp\Program.cs(7,24,7,32): error CS0246: The type or namespace name 'FxCommon' could not be found (are you missing a using directive or an assembly reference?) 2>Done building project "CoreConsoleApp.csproj" -- FAILED. ========== Build: 1 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

但是在Program.cs中，我可以使用代码，IntelliSense不会显示任何错误.

But in the Program.cs I am able to use the code, IntelliSense not showing any error.

using System;
using FX.Core;
namespace CoreConsoleApp
{
    class Program
    {
        private static FxCommon _fxCommon = new FxCommon();
        static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");
            _fxCommon.Logger.LogWrite("hello");
        }
    }
}

由于这个原因，我无法运行控制台应用程序，请帮忙.

I am not able to run the console application due to this, please help.

推荐答案

.NET Core 不使用 .NET Framework(net###)目标；它可以消耗netstandard*和netcoreapp*.

.NET Core doesn't consume .NET Framework (net###) targets; it can consume netstandard* and netcoreapp*.

所以；您的FxCore将需要定位/多定位.NET Standard或.NET Core之一.

So; your FxCore is going to need to target/multi-target one of .NET Standard or .NET Core.

针对目标/多目标选择什么:

In terms of choice of what to target/multi-target:

  1. 目标netstandard*-如果您在实现中不需要任何特定于框架的内容
  2. 多目标netcoreapp*和netstandard*-如果要在可用的情况下使用netcoreapp*功能，否则，请使用下层通用实施方式
  3. 多目标netcoreapp*和net###-如果实现完全是特定于平台的，并且不可能实现通用实现
  1. target netstandard* - if you don't need anything framework-specific in the implementation
  2. multi-target netcoreapp* and netstandard* - if you want to use netcoreapp* features when they are available, or use a down-level common implementation otherwise
  3. multi-target netcoreapp* and net### - if the implementations are completely platform specific and no common implementation is possible

(其中*/###是您选择的版本-当前可能是netstandard2.1，netcoreapp3.1和net472/net48)

(where * / ### is your choice of versions - probably netstandard2.1, netcoreapp3.1 and net472/net48 at the current time)

这篇关于在.net核心控制台应用程序中使用.net类库时，项目构建失败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！

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