SignalR Core w / ASP.net Core 2.0 in VS 2017 15.3无法加载文件或程序集’System.Diagnostics.DiagnosticSource，Version = 4.0.2.1

SignalR Core w/ ASP.net Core 2.0 in VS 2017 15.3 Could not load file or assembly 'System.Diagnostics.DiagnosticSource, Version=4.0.2.1

在运行时异常的VS 2017 15.3中，SignalR Core预先发布了ASP.net Core 2.0 ..无法加载文件或程序集'System.Diagnostics.DiagnosticSource，Version = 4.0.2.1

我在运行时获得异常而不是构建时间
抛出异常：Microsoft.AspNetCore.Hosting.dll中的"System.IO.FileLoadException"
Microsoft.AspNetCore.Hosting.dll中发生未处理的"System.IO.FileLoadException"类型的异常异常
无法加载文件或程序集'System.Diagnostics.DiagnosticSource，Version = 4.0.2.1，Culture = neutral，PublicKeyToken = cc7b13ffcd2ddd51'。定位的程序集的清单定义与程序集引用不匹配。 (HRESULT异常：0x80131040)

错误的代码行是......

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public static IWebHost BuildWebHost(string[] args) =>
WebHost.CreateDefaultBuilder(args)
.UseStartup<Startup>()
.Build();

这里是运行后构建的日志文件的摘录
dotnet build -v d> build.log

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Dependency"System.Diagnostics.DiagnosticSource, Version=4.0.2.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51".
Could not resolve this reference. Could not locate the assembly"System.Diagnostics.DiagnosticSource, Version=4.0.2.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51". Check to make sure the assembly exists on disk. If this reference is required by your code, you may get compilation errors.

D： org projects> dotnet --version 2.0.0-preview2-006497

PackageReference Include ="Microsoft.AspNetCore.SignalR"Version ="1.0.0-preview2-24707"
PackageReference Include ="Microsoft.AspNetCore.All"Version ="2.0.0-preview2-final"