无法在我的 C# .NET 8 控制台应用程序中使用 System.IO.Ports

Question

我有一些使用 .NET 框架创建 C# 应用程序的经验。然而，我很困惑如何解决这个问题。

好的，花了最后一个小时尝试使用 C# 和 .NET 8 控制台应用程序运行最简单的应用程序。

我的目标：从 ESP8266 串行监视器的串行 USB 连接读取文本。

我见过很多这样做的例子：

using System.IO.Ports;
using System.IO;

SerialPort port = new SerialPort();

这在我的系统上完全失败了。似乎缺少了一些东西：System.IO.Ports。

Determining projects to restore...
All projects are up-to-date for restore.

C:\sources\esp8266\USBComPortReader6b\USBComPortReader6b\Program.cs(7,1): error CS1069: The type name 'SerialPort' could not be found in the namespace 'System.IO.Ports'. This type has been forwarded to assembly 'Syst
em.IO.Ports, Version=0.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' Consider adding a reference to that assembly. [C:\sources\esp8266\USBComPortReader6b\USBComPortReader6b\USBComPortReader6b.csproj]
C:\sources\esp8266\USBComPortReader6b\USBComPortReader6b\Program.cs(7,29): error CS1069: The type name 'SerialPort' could not be found in the namespace 'System.IO.Ports'. This type has been forwarded to assembly 'Sys
tem.IO.Ports, Version=0.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' Consider adding a reference to that assembly. [C:\sources\esp8266\USBComPortReader6b\USBComPortReader6b\USBComPortReader6b.csproj]

Build FAILED.

C:\sources\esp8266\USBComPortReader6b\USBComPortReader6b\Program.cs(7,1): error CS1069: The type name 'SerialPort' could not be found in the namespace 'System.IO.Ports'. This type has been forwarded to assembly 'Syst
em.IO.Ports, Version=0.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' Consider adding a reference to that assembly. [C:\sources\esp8266\USBComPortReader6b\USBComPortReader6b\USBComPortReader6b.csproj]
C:\sources\esp8266\USBComPortReader6b\USBComPortReader6b\Program.cs(7,29): error CS1069: The type name 'SerialPort' could not be found in the namespace 'System.IO.Ports'. This type has been forwarded to assembly 'Sys
tem.IO.Ports, Version=0.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' Consider adding a reference to that assembly. [C:\sources\esp8266\USBComPortReader6b\USBComPortReader6b\USBComPortReader6b.csproj]
    0 Warning(s)
    2 Error(s)

Time Elapsed 00:00:01.50

在项目资源管理器中我看到这些：

我到处搜索，有人建议我应该为此安装一个 NuGet 包：

Results in:


C:\sources\esp8266\USBComPortReader6b\USBComPortReader6b>dotnet add package System.IO.Ports --version 8.0.0
  Determining projects to restore...
  Writing C:\Users\e2692\AppData\Local\Temp\tmpb01oaz.tmp
info : X.509 certificate chain validation will use the default trust store selected by .NET for code signing.
info : X.509 certificate chain validation will use the default trust store selected by .NET for timestamping.
info : Adding PackageReference for package 'System.IO.Ports' into project 'C:\sources\esp8266\USBComPortReader6b\USBComPortReader6b\USBComPortReader6b.csproj'.
info : Restoring packages for C:\sources\esp8266\USBComPortReader6b\USBComPortReader6b\USBComPortReader6b.csproj...
error: NU1101: Unable to find package System.IO.Ports. No packages exist with this id in source(s): Microsoft Visual Studio Offline Packages
error: Package 'System.IO.Ports' is incompatible with 'all' frameworks in project 'C:\sources\esp8266\USBComPortReader6b\USBComPortReader6b\USBComPortReader6b.csproj'.

有些人建议 .NET 8（或任何版本）不支持

System.IO.Ports

。但是，Microsoft 有一个手册页

在 Windows 11 上运行。尝试过 Jetbrains Rider 和 Visual Studio 2022 社区版。

执行项目文件夹中的

dotnet --version

：

C:\sources\esp8266\USBComPortReader6b\USBComPortReader6b>dotnet --version
8.0.402

外面：

C:\>dotnet --version
8.0.402

C:\>dotnet --list-sdks
6.0.425 [C:\Program Files\dotnet\sdk]
8.0.400 [C:\Program Files\dotnet\sdk]
8.0.402 [C:\Program Files\dotnet\sdk]

有关我的项目的更多信息：

溶液性质：

# Visual Studio Version 17
VisualStudioVersion = 17.11.35312.102
MinimumVisualStudioVersion = 10.0.40219.1
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "USBComPortReader6b", "USBComPortReader6b\USBComPortReader6b.csproj", "{92218195-33A1-48E3-B5DB-19B44769E322}"
EndProject
Global
        GlobalSection(SolutionConfigurationPlatforms) = preSolution
                Debug|Any CPU = Debug|Any CPU
                Release|Any CPU = Release|Any CPU
        EndGlobalSection
        GlobalSection(ProjectConfigurationPlatforms) = postSolution
                {92218195-33A1-48E3-B5DB-19B44769E322}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
                {92218195-33A1-48E3-B5DB-19B44769E322}.Debug|Any CPU.Build.0 = Debug|Any CPU
                {92218195-33A1-48E3-B5DB-19B44769E322}.Release|Any CPU.ActiveCfg = Release|Any CPU
                {92218195-33A1-48E3-B5DB-19B44769E322}.Release|Any CPU.Build.0 = Release|Any CPU
        EndGlobalSection
        GlobalSection(SolutionProperties) = preSolution
                HideSolutionNode = FALSE
        EndGlobalSection
        GlobalSection(ExtensibilityGlobals) = postSolution
                SolutionGuid = {0298EA09-525B-42F7-954D-EC886703AEAC}
        EndGlobalSection
EndGlobal

.csproj

文件：

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net8.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

</Project>

说我感到沮丧是轻描淡写的。我已经处理了这些与平台相关的问题，但我完全不知道如何解决这个问题。

任何帮助将不胜感激！

Answer 1

错误消息指出：

源中不存在具有此 ID 的包：Microsoft Visual Studio 离线包。

要添加 System.IO.Ports NuGet 包请指定源：

dotnet add package "System.IO.Ports" --version 8.0.0 --source "https://api.nuget.org/v3/index.json"

注意：如果使用 Visual Studio，请在 Visual Studio 菜单中选择

• 工具
• 选项...
• NuGet 包管理器
• 包来源。

如果

https://api.nuget.org/v3/index.json

未列为来源，请添加它。 （名称：nuget.org；来源：https://api.nuget.org/v3/index.json）。

此外，请确保将 Package Management 设置为 PackageReference

• 工具
• 选项...
• NuGet 包管理器
• 一般
• 默认包管理格式：PackageReference

另请参阅：dotnet 新控制台 --use-program-main 不起作用