我有dotnet-sdk-3.0.100-preview3-010431-win-x64 zip二进制文件并将其解压缩到C:\dotnet并将此路径添加到用户变量路径。我之前在该路径中有dotnet 2.2，我删除了它并粘贴新版本（preview3-010431）来创建一个blazor项目。
dotnet可以正确创建和运行webapp项目，但不是blazor。首先我执行了这个命令：
dotnet new -i Microsoft.AspNetCore.Blazor.Templates::0.9.0-preview3-19154-02
当我跑：
dotnet new blazor -o WebApplication1
cd WebApplication1
没关系。但dotnet build不起作用，我收到错误：
“C：\ Users \ sap-komaei.CII.nuget \ packages \ microsoft.aspnetcore.blazor.build \ 0.9.0-preview3-19154-02 \ targets \ Blazor.MonoRuntime.targets（439,5）：错误MSB3073：命令“dotnet”C：\ Users \ sap-komaei.CII.nuget \ packages \ microsoft.aspnetcore.blazor.mono \ 0.8.0-preview-20190204.1 \ build \ netstandard1.0 ../../ tools / illink /illink.dll“-l none --verbose --strip-security true --exclude-feature com --exclude-feature sre -v false -c link -u link -b true -d”C：\ Users \ sap -komaei.CII.nuget \ packages \ microsoft.aspnetcore.blazor.mono \ 0.8.0-preview-20190204.1 \ build \ netstandard1.0 ../../ tools / mono / bcl /“ - d”C：\ Users \ sap-komaei.CII.nuget \ packages \ microsoft.aspnetcore.blazor.mono \ 0.8.0-preview-20190204.1 \ build \ netstandard1.0 ../../ tools / mono / bcl / Facades /“ - o” E：\ Projects \ WebApplication1 \ obj \ Debug \ netstandard2.0 \ blazor \ linker /“ - x”C：\ Users \ sap-komaei.CII.nuget \ packages \ microsoft.aspnetcore.blazor.build \ 0.9.0- preview3-19154-02 \ targets \ BuiltInBclLinkerDescriptor.xml“-x”E：\ Projects \ WebApplication1 \ obj \ Debug \ netsta ndard2.0 \ blazor \ linker.descriptor.xml“-a”C：\ Users \ sap-komaei.CII.nuget \ packages \ microsoft.aspnetcore.blazor \ 0.9.0-preview3-19154-02 \ lib \ netstandard2。 0 \ Microsoft.AspNetCore.Blazor.dll“-a”C：\ Users \ sap-komaei.CII.nuget \ packages \ microsoft.aspnetcore.components \ 3.0.0-preview3-19153-02 \ lib \ netstandard2.0 \ Microsoft.AspNetCore.Components.dll“-a”C：\ Users \ sap-komaei.CII.nuget \ packages \ microsoft.aspnetcore.components.browser \ 3.0.0-preview3-19153-02 \ lib \ netstandard2.0 \ Microsoft.AspNetCore.Components.Browser.dll“-a”C：\ Users \ sap-komaei.CII.nuget \ packages \ microsoft.extensions.dependencyinjection \ 3.0.0-preview3.19153.1 \ lib \ netstandard2.0 \ Microsoft。 Extensions.DependencyInjection.dll“-a”C：\ Users \ sap-komaei.CII.nuget \ packages \ microsoft.extensions.dependencyinjection.abstractions \ 3.0.0-preview3.19153.1 \ lib \ netstandard2.0 \ Microsoft.Extensions。 DependencyInjection.Abstractions.dll“-a”C：\ Users \ sap-komaei.CII.nuget \ packages \ microsoft.jsinterop \ 3.0.0-preview3.19153.1 \ lib \ netstandard2.0 \ Microsoft.JSI nterop.dll“-a”C：\ Users \ sap-komaei.CII.nuget \ packages \ mono.webassembly.interop \ 3.0.0-preview3.19153.1 \ lib \ netstandard2.0 \ Mono.WebAssembly.Interop.dll“ -a“C：\ Users \ sap-komaei.CII.nuget \ packages \ system.componentmodel.annotations \ 4.6.0-preview3.19128.7 \ lib \ netstandard2.0 \ System.ComponentModel.Annotations.dll”-a“E ：\ Projects \ WebApplication1 \ obj \ Debug \ netstandard2.0 \ WebApplication1.dll“”已退出，代码为-2147450730。 [E：\项目\ WebApplication1 \ WebApplication1.csproj]
建立失败。
C：\ Users \ sap-komaei.CII.nuget \ packages \ microsoft.aspnetcore.blazor.build \ 0.9.0-preview3-19154-02 \ targets \ Blazor.MonoRuntime.targets（439,5）：错误MSB3073：命令“dotnet”C：\ Users \ sap-komaei.CII.nuget \ packages \ microsoft.aspnetcore.blazor.mono \ 0.8.0-preview-20190204.1 \ build \ netstandard1.0 ../../ tools / illink / illink.dll“-l none --verbose --strip-security true --exclude-feature com --exclude-feature sre -v false -c link -u link -b true -d”C：\ Users \ sap- komaei.CII.nuget \ packages \ microsoft.aspnetcore.blazor.mono \ 0.8.0-preview-20190204.1 \ build \ netstandard1.0 ../../ tools / mono / bcl /“ - d”C：\ Users \ sap-komaei.CII.nuget \ packages \ microsoft.aspnetcore.blazor.mono \ 0.8.0-preview-20190204.1 \ build \ netstandard1.0 ../../ tools / mono / bcl / Facades /“ - o”E ：\ Projects \ WebApplication1 \ obj \ Debug \ netstandard2.0 \ blazor \ linker /“ - x”C：\ Users \ sap-komaei.CII.nuget \ packages \ microsoft.aspnetcore.blazor.build \ 0.9.0-preview3 -19154-02 \ targets \ BuiltInBclLinkerDescriptor.xml“-x”E：\ Projects \ WebApplication1 \ obj \ Debug \ netstan dard2.0 \ blazor \ linker.descriptor.xml“-a”C：\ Users \ sap-komaei.CII.nuget \ packages \ microsoft.aspnetcore.blazor \ 0.9.0-preview3-19154-02 \ lib \ netstandard2。 0 \ Microsoft.AspNetCore.Blazor.dll“-a”C：\ Users \ sap-komaei.CII.nuget \ packages \ microsoft.aspnetcore.components \ 3.0.0-preview3-19153-02 \ lib \ netstandard2.0 \ Microsoft.AspNetCore.Components.dll“-a”C：\ Users \ sap-komaei.CII.nuget \ packages \ microsoft.aspnetcore.components.browser \ 3.0.0-preview3-19153-02 \ lib \ netstandard2.0 \ Microsoft.AspNetCore.Components.Browser.dll“-a”C：\ Users \ sap-komaei.CII.nuget \ packages \ microsoft.extensions.dependencyinjection \ 3.0.0-preview3.19153.1 \ lib \ netstandard2.0 \ Microsoft。 Extensions.DependencyInjection.dll“-a”C：\ Users \ sap-komaei.CII.nuget \ packages \ microsoft.extensions.dependencyinjection.abstractions \ 3.0.0-preview3.19153.1 \ lib \ netstandard2.0 \ Microsoft.Extensions。 DependencyInjection.Abstractions.dll“-a”C：\ Users \ sap-komaei.CII.nuget \ packages \ microsoft.jsinterop \ 3.0.0-preview3.19153.1 \ lib \ netstandard2.0 \ Microsoft.JSIn terop.dll“-a”C：\ Users \ sap-komaei.CII.nuget \ packages \ mono.webassembly.interop \ 3.0.0-preview3.19153.1 \ lib \ netstandard2.0 \ Mono.WebAssembly.Interop.dll“ -a“C：\ Users \ sap-komaei.CII.nuget \ packages \ system.componentmodel.annotations \ 4.6.0-preview3.19128.7 \ lib \ netstandard2.0 \ System.ComponentModel.Annotations.dll”-a“E ：\ Projects \ WebApplication1 \ obj \ Debug \ netstandard2.0 \ WebApplication1.dll“”已退出，代码为-2147450730。 [E：\ Projects \ WebApplication1 \ WebApplication1.csproj] 0警告1错误“
我删除了C：\ Users \ sap-komaei.CII.nuget \ packages中的所有包，但是存在错误。我也删除了C：\ Users \ sap-komaei.CII.dotnet中的所有文件和文件夹，但是存在错误。
我跑完之后：
dotnet new -i Microsoft.AspNetCore.Blazor.Templates
然后构建，我得到这个错误：
“C：\ Users \ sap-komaei.CII.nuget \ packages \ microsoft.aspnetcore.blazor.build \ 0.7.0 \ targets \ RazorCompilation.targets（184,5）：错误：rzc generate退出，代码为-2147450730。[ E：\项目\ WebApplication1 \ WebApplication1.csproj]
建立失败。
C：\ Users \ sap-komaei.CII.nuget \ packages \ microsoft.aspnetcore.blazor.build \ 0.7.0 \ targets \ RazorCompilation.targets（184,5）：错误：rzc generate退出，代码为-2147450730。 [E：\ Projects \ WebApplication1 \ WebApplication1.csproj] 0警告1错误“
是
我想通了。
为了构建blazor模板，我们必须安装dotnet core v3预览版和最新的2.2版本。我无法在我的工作电脑上安装任何应用程序。所以我使用便携版本。
我的决议：