在 .Net Core 2.2 Web API 中添加 WCF 参考失败

如何解决在 .Net Core 2.2 Web API 中添加 WCF 参考失败

我正在使用 VS 2017、.Net Core 2.2 API 项目，以及对其他服务的一些 WCF 引用。一切正常，直到我在同一台机器上安装了 VS 2019。

现在尝试Add Connected Service时，它在步骤上停留了一段时间：

Restoring NuGet packages for bootstrapper...

然后失败并显示以下错误消息。

Importing web service metadata ...
Number of service endpoints found: 1
Scaffolding service reference code ...
Restoring NuGet packages for bootstrapper ...
Warning:Warning: Determining projects to restore...
C:\Users\midrees\AppData\Local\Temp\WCFConnectedService\2021_Feb_23_10_27_37\svcutil_bootstrap\SvcutilBootstrapper.csproj : error NU1605: Detected package downgrade: Microsoft.Extensions.DependencyInjection from 3.1.2 to 2.2.0. Reference the package directly from the project to select a different version. 
C:\Users\midrees\AppData\Local\Temp\WCFConnectedService\2021_Feb_23_10_27_37\svcutil_bootstrap\SvcutilBootstrapper.csproj : error NU1605:  SvcutilBootstrapper -> Serilog.AspNetCore 3.4.0 -> Microsoft.Extensions.DependencyInjection (>= 3.1.2) 
C:\Users\midrees\AppData\Local\Temp\WCFConnectedService\2021_Feb_23_10_27_37\svcutil_bootstrap\SvcutilBootstrapper.csproj : error NU1605:  SvcutilBootstrapper -> Microsoft.Extensions.DependencyInjection (>= 2.2.0)
C:\Users\midrees\AppData\Local\Temp\WCFConnectedService\2021_Feb_23_10_27_37\svcutil_bootstrap\SvcutilBootstrapper.csproj : error NU1605: Detected package downgrade: Microsoft.Extensions.Logging from 3.1.2 to 2.2.0. Reference the package directly from the project to select a different version. 
C:\Users\midrees\AppData\Local\Temp\WCFConnectedService\2021_Feb_23_10_27_37\svcutil_bootstrap\SvcutilBootstrapper.csproj : error NU1605:  SvcutilBootstrapper -> Serilog.AspNetCore 3.4.0 -> Microsoft.Extensions.Logging (>= 3.1.2) 
C:\Users\midrees\AppData\Local\Temp\WCFConnectedService\2021_Feb_23_10_27_37\svcutil_bootstrap\SvcutilBootstrapper.csproj : error NU1605:  SvcutilBootstrapper -> Microsoft.Extensions.Logging (>= 2.2.0)
  Failed to restore C:\Users\midrees\AppData\Local\Temp\WCFConnectedService\2021_Feb_23_10_27_37\svcutil_bootstrap\SvcutilBootstrapper.csproj (in 8.33 sec).
Building bootstrapper project ...
Error:Error: Microsoft (R) Build Engine version 16.8.3+39993bd9d for .NET
Copyright (C) Microsoft Corporation. All rights reserved.

C:\Users\midrees\AppData\Local\Temp\WCFConnectedService\2021_Feb_23_10_27_37\svcutil_bootstrap\SvcutilBootstrapper.csproj : error NU1605: Detected package downgrade: Microsoft.Extensions.DependencyInjection from 3.1.2 to 2.2.0. Reference the package directly from the project to select a different version. 
C:\Users\midrees\AppData\Local\Temp\WCFConnectedService\2021_Feb_23_10_27_37\svcutil_bootstrap\SvcutilBootstrapper.csproj : error NU1605:  SvcutilBootstrapper -> Serilog.AspNetCore 3.4.0 -> Microsoft.Extensions.DependencyInjection (>= 3.1.2) 
C:\Users\midrees\AppData\Local\Temp\WCFConnectedService\2021_Feb_23_10_27_37\svcutil_bootstrap\SvcutilBootstrapper.csproj : error NU1605:  SvcutilBootstrapper -> Microsoft.Extensions.DependencyInjection (>= 2.2.0)
C:\Users\midrees\AppData\Local\Temp\WCFConnectedService\2021_Feb_23_10_27_37\svcutil_bootstrap\SvcutilBootstrapper.csproj : error NU1605: Detected package downgrade: Microsoft.Extensions.Logging from 3.1.2 to 2.2.0. Reference the package directly from the project to select a different version. 
C:\Users\midrees\AppData\Local\Temp\WCFConnectedService\2021_Feb_23_10_27_37\svcutil_bootstrap\SvcutilBootstrapper.csproj : error NU1605:  SvcutilBootstrapper -> Serilog.AspNetCore 3.4.0 -> Microsoft.Extensions.Logging (>= 3.1.2) 
C:\Users\midrees\AppData\Local\Temp\WCFConnectedService\2021_Feb_23_10_27_37\svcutil_bootstrap\SvcutilBootstrapper.csproj : error NU1605:  SvcutilBootstrapper -> Microsoft.Extensions.Logging (>= 2.2.0)

Build FAILED.

C:\Users\midrees\AppData\Local\Temp\WCFConnectedService\2021_Feb_23_10_27_37\svcutil_bootstrap\SvcutilBootstrapper.csproj : error NU1605: Detected package downgrade: Microsoft.Extensions.DependencyInjection from 3.1.2 to 2.2.0. Reference the package directly from the project to select a different version. 
C:\Users\midrees\AppData\Local\Temp\WCFConnectedService\2021_Feb_23_10_27_37\svcutil_bootstrap\SvcutilBootstrapper.csproj : error NU1605:  SvcutilBootstrapper -> Serilog.AspNetCore 3.4.0 -> Microsoft.Extensions.DependencyInjection (>= 3.1.2) 
C:\Users\midrees\AppData\Local\Temp\WCFConnectedService\2021_Feb_23_10_27_37\svcutil_bootstrap\SvcutilBootstrapper.csproj : error NU1605:  SvcutilBootstrapper -> Microsoft.Extensions.DependencyInjection (>= 2.2.0)
C:\Users\midrees\AppData\Local\Temp\WCFConnectedService\2021_Feb_23_10_27_37\svcutil_bootstrap\SvcutilBootstrapper.csproj : error NU1605: Detected package downgrade: Microsoft.Extensions.Logging from 3.1.2 to 2.2.0. Reference the package directly from the project to select a different version. 
C:\Users\midrees\AppData\Local\Temp\WCFConnectedService\2021_Feb_23_10_27_37\svcutil_bootstrap\SvcutilBootstrapper.csproj : error NU1605:  SvcutilBootstrapper -> Serilog.AspNetCore 3.4.0 -> Microsoft.Extensions.Logging (>= 3.1.2) 
C:\Users\midrees\AppData\Local\Temp\WCFConnectedService\2021_Feb_23_10_27_37\svcutil_bootstrap\SvcutilBootstrapper.csproj : error NU1605:  SvcutilBootstrapper -> Microsoft.Extensions.Logging (>= 2.2.0)
    0 Warning(s)
    2 Error(s)

Time Elapsed 00:00:02.97

An error occurred while bootstrapping svcutil. This usually happens when processing references.  You might be able to work around this problem by not providing reference parameters,and manually removing any types redefined in the generated proxy code.
Done.

解决方法

这是一个Visual Studio问题，github上也有同样的问题，可以参考it。

除了使用Add Connected Service来生成代理类，我们还可以使用dotnet-svcutil命令来生成代理类。

Windows Communication Foundation (WCF) dotnet-svcutil 工具是一种 .NET 工具，可从网络位置上的 Web 服务或从 WSDL 文件中检索元数据，并生成包含访问 Web 服务的客户端代理方法的 WCF 类操作。

类似于用于 .NET Framework 项目的服务模型元数据 - svcutil 工具，dotnet-svcutil 是一个命令行工具，用于生成与 .NET Core 和 .NET Standard 项目兼容的 Web 服务引用。

建议您使用 dotnet-svcutil 生成代理类，有关 dotnet-svcutil 的更多信息，您可以参考此link。