深入浅出Blazor webassembly之vs code 环境设置过程

1. 安装了最新的 dot net SDK 6.0.100-preview.3.21202.5

2. 为 VS code 安装 C#插件, 需要在 v1.23.12 以上版本

3. 建立了blazor wasm 模版项目, 能正常运行起来.

4. 但发现VS code 的 intellicode 功能失效, 比如代码导航功能不能使用

深入浅出Blazor webassembly之vs code 环境设置过程

⒌ 在VS code 中重启 OmniSharp , 发现如下报错.

[info]: OmniSharp.Stdio.Host
        Starting OmniSharp on Windows 6.1.7601.65536 (x64)
[info]: OmniSharp.Services.DotNetCliService
        DotNetPath set to dotnet
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
        Located 2 MSBuild instance(s)
            1: Visual Studio Community 2019 16.6.30225.117 16.6.0 - "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Current\Bin"
            2: StandAlone 17.0.0 - "c:\Users\drothy64\.vscode\extensions\ms-dotnettools.csharp-1.23.14\.omnisharp\1.37.15-beta.7\.msbuild\Current\Bin"
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
        Registered MSBuild instance: Visual Studio Community 2019 16.6.30225.117 16.6.0 - "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Current\Bin"
[info]: OmniSharp.WorkspaceInitializer
        Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.CSharpFormattingWorkspaceOptionsProvider, Order: 0
[info]: OmniSharp.WorkspaceInitializer
        Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.Completion.CompletionOptionsProvider, Order: 0
[info]: OmniSharp.WorkspaceInitializer
        Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.RenameWorkspaceOptionsProvider, Order: 100
[info]: OmniSharp.WorkspaceInitializer
        Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.ImplementTypeWorkspaceOptionsProvider, Order: 110
[info]: OmniSharp.WorkspaceInitializer
        Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.BlockStructureWorkspaceOptionsProvider, Order: 140
[info]: OmniSharp.Cake.CakeProjectSystem
        Detecting Cake files in 'c:\Users\drothy64\Desktop\blazor\projects'.
[info]: OmniSharp.Cake.CakeProjectSystem
        Could not find any Cake files
[info]: OmniSharp.MSBuild.ProjectSystem
        Detecting projects in 'c:\Users\drothy64\Desktop\blazor\projects\blazordemo.sln'.
[info]: OmniSharp.MSBuild.ProjectManager
        Queue project update for 'c:\Users\drothy64\Desktop\blazor\projects\blazorDemo1\blazorDemo1.csproj'
[info]: OmniSharp.Script.ScriptProjectSystem
        Detecting CSX files in 'c:\Users\drothy64\Desktop\blazor\projects'.
[info]: OmniSharp.Script.ScriptProjectSystem
        Could not find any CSX files
[info]: OmniSharp.WorkspaceInitializer
        Configuration finished.
[info]: OmniSharp.Stdio.Host
        Omnisharp server running using Stdio at location 'c:\Users\drothy64\Desktop\blazor\projects' on host 7256.
[info]: OmniSharp.MSBuild.ProjectManager
        Loading project: c:\Users\drothy64\Desktop\blazor\projects\blazorDemo1\blazorDemo1.csproj
[fail]: OmniSharp.MSBuild.ProjectManager
        Failed to load project file '{projectFilePath}'.
Microsoft.Build.Exceptions.InvalidProjectFileException: 找不到指定的 SDK“Microsoft.NET.Sdk.BlazorWebAssembly”。

问题分析:

程序能正常编译运行, 说明 .net 6 SDK安装没有问题, 项目文件也是正常的, 而且可以运行, 不应该会报 InvalidProjectFileException 异常啊.

既然项目文件没有问题, 会不会是 OmniSharp.MSBuild 的问题呢? 仔细看日志, OmniSharp 找到了两个 msbuild, 一个是VS code 的C#插件自带的, 另一个是 VS 2019 16.6 自带的, 而且 OmniSharp 使用了 VS 2019 16.6 自带的 msbuild, 可能是 VS 2019 16.6 的msbuild 版本较老, 和 OmniSharp 的roslyn编译器不兼容.

参考 https://github.com/OmniSharp/omnisharp-roslyn/issues/1700 解决了该问题.

解决方案是: 强制 omnisharp 使用自带的 msbuild.

具体为:

(1) 新建 C:\Users\{username}\.omnisharp\omnisharp.json 文件

(2) 编辑文件内容如下, 注意替换真实的路径

{
    "msbuild": {
        "useBundledOnly": true
    },
    "RoslynExtensionsOptions": {
        "enableAnalyzersSupport": true
    },
    "FormattingOptions": {
        "enableEditorConfigSupport": true
    }
}

或者直接指定msbuild路径

{
    "MSBuild": {
        "msbuildoverride": {
            "MSBuildPath": "C:\\Users\\{username}\\.vscode\\extensions\\ms-dotnettools.csharp-1.23.14\\.omnisharp\\1.37.15-beta.7\\.msbuild\\Current\\Bin",
            "Name": "OmniSharp MSBuild",
            "PropertyOverrides": {
                "MSBuildExtensionsPath": "C:\\Users\\{username}\\.vscode\\extensions\\ms-dotnettools.csharp-1.23.14\\.omnisharp\\1.37.15-beta.7\\.msbuild"
            }
        }
    }
}

然后重启 onmisharp 服务, intellicode 恢复正常.

6. VS code 仍然报 Error Acquisition .Net 错误 , 这个没有找到解决方案, 但不影响调试运行, 不用管它

深入浅出Blazor webassembly之vs code 环境设置过程

7. 在浏览器端调试 Blazor 程序

步骤1: 按照正常方式运行 blazor 项目, 不需要在调试模式下.

步骤2. 以启用调试模式打开 chrome 或edge 浏览器(不能使用firefox) , 命令行如下:
msedge --remote-debugging-port=9222 http://localhost:5000/

chrome --remote-debugging-port=9222 http://localhost:5000/

使用上面命令后, 浏览器会监听 9222 调试端口, vscode为 blazor 项目已经实现了chrome devtools protocol 协议, 在vs code中开启项目, 除了会监听应用正常的http 5000端口外, 还会开启 63021 端口, 在浏览器端的 chrome devtools 会连接 63021 端口.

深入浅出Blazor webassembly之vs code 环境设置过程