无法使以下项目可运行（对象引用未设置为对象的实例。）
Failed to make the following project runnable (Object reference not set to an instance of an object.)
当我使用安装的 .NET Core 1.0 SDK 和工具（预览版 2）在 Visual Studio 2015（更新 3）中创建默认 Web 项目并在恢复本地源代码控制更改后重新启动 Visual Studio 我收到以下 编译错误:
Failed to make the following project runnable: MyDefaultWebProject (.NETCoreApp,Version=v1.0) reason: Object reference not set to an instance of an object.
根据 Visual Studio，错误位于第 262 行的 C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v14.0\DotNet\Microsoft.DotNet.Common.Targets
这一行有如下代码：
<Dnx
RuntimeExe="$(SDKToolingExe)"
Condition="'$(_DesignTimeHostBuild)' != 'true'"
ProjectFolder="$(MSBuildProjectDirectory)"
Arguments="$(_BuildArguments)"
/>
我该如何解决这样的问题？
我设法找到的唯一可行的解决方案是 运行 dotnet restore
命令：
C:\Dev\*****>dotnet restore
Welcome to .NET Core!
---------------------
Learn more about .NET Core @ https://aka.ms/dotnet-docs. Use dotnet --help to see available commands or go to https://aka.ms/dotnet-cli-docs.
Telemetry
--------------
The .NET Core tools collect usage data in order to improve your experience. The data is anonymous and does not include commandline arguments. The data is collected by Microsoft and shared with the community.
You can opt out of telemetry by setting a DOTNET_CLI_TELEMETRY_OPTOUT environment variable to 1 using your favorite shell.
You can read more about .NET Core tools telemetry @ https://aka.ms/dotnet-cli-telemetry.
Configuring...
-------------------
A command is running to initially populate your local package cache, to improve restore speed and enable offline access. This command will take up to a minute to complete and will only happen once.
Decompressing 100% 2181 ms
Expanding 100% 9113 ms
log : Restoring packages for C:\Dev\*****\project.json...
log : Restoring packages for tool 'BundlerMinifier.Core' in C:\Dev\*****\project.json...
log : Restoring packages for tool 'Microsoft.AspNetCore.Razor.Tools' in C:\Dev\*****\project.json...
log : Restoring packages for tool 'Microsoft.AspNetCore.Server.IISIntegration.Tools' in C:\Dev\*****\project.json...
log : Restoring packages for tool 'Microsoft.EntityFrameworkCore.Tools' in C:\Dev\*****\project.json...
log : Restoring packages for tool 'Microsoft.Extensions.SecretManager.Tools' in C:\Dev\*****\project.json...
log : Restoring packages for tool 'Microsoft.VisualStudio.Web.CodeGeneration.Tools' in C:\Dev\*****\project.json...
log : Writing lock file to disk. Path: C:\Dev\*****\project.lock.json
log : C:\Dev\*****\project.json
log : Restore completed in 13207ms.
之后Visual Studio中的编译又成功了
在我的例子中，问题是当我从源代码管理中提取源代码时，解决方案中的 class 库项目之一通过绝对路径引用了 AspNetCore.Identity 库。因此 - project.fragment.lock.json 文件中生成了错误的路径，解决方案无法构建。
修复 .csproj 文件中的绝对路径引用使其工作。
当我使用安装的 .NET Core 1.0 SDK 和工具（预览版 2）在 Visual Studio 2015（更新 3）中创建默认 Web 项目并在恢复本地源代码控制更改后重新启动 Visual Studio 我收到以下 编译错误:
Failed to make the following project runnable: MyDefaultWebProject (.NETCoreApp,Version=v1.0) reason: Object reference not set to an instance of an object.
根据 Visual Studio，错误位于第 262 行的 C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v14.0\DotNet\Microsoft.DotNet.Common.Targets
这一行有如下代码：
<Dnx
RuntimeExe="$(SDKToolingExe)"
Condition="'$(_DesignTimeHostBuild)' != 'true'"
ProjectFolder="$(MSBuildProjectDirectory)"
Arguments="$(_BuildArguments)"
/>
我该如何解决这样的问题？
我设法找到的唯一可行的解决方案是 运行 dotnet restore
命令：
C:\Dev\*****>dotnet restore
Welcome to .NET Core!
---------------------
Learn more about .NET Core @ https://aka.ms/dotnet-docs. Use dotnet --help to see available commands or go to https://aka.ms/dotnet-cli-docs.
Telemetry
--------------
The .NET Core tools collect usage data in order to improve your experience. The data is anonymous and does not include commandline arguments. The data is collected by Microsoft and shared with the community.
You can opt out of telemetry by setting a DOTNET_CLI_TELEMETRY_OPTOUT environment variable to 1 using your favorite shell.
You can read more about .NET Core tools telemetry @ https://aka.ms/dotnet-cli-telemetry.
Configuring...
-------------------
A command is running to initially populate your local package cache, to improve restore speed and enable offline access. This command will take up to a minute to complete and will only happen once.
Decompressing 100% 2181 ms
Expanding 100% 9113 ms
log : Restoring packages for C:\Dev\*****\project.json...
log : Restoring packages for tool 'BundlerMinifier.Core' in C:\Dev\*****\project.json...
log : Restoring packages for tool 'Microsoft.AspNetCore.Razor.Tools' in C:\Dev\*****\project.json...
log : Restoring packages for tool 'Microsoft.AspNetCore.Server.IISIntegration.Tools' in C:\Dev\*****\project.json...
log : Restoring packages for tool 'Microsoft.EntityFrameworkCore.Tools' in C:\Dev\*****\project.json...
log : Restoring packages for tool 'Microsoft.Extensions.SecretManager.Tools' in C:\Dev\*****\project.json...
log : Restoring packages for tool 'Microsoft.VisualStudio.Web.CodeGeneration.Tools' in C:\Dev\*****\project.json...
log : Writing lock file to disk. Path: C:\Dev\*****\project.lock.json
log : C:\Dev\*****\project.json
log : Restore completed in 13207ms.
之后Visual Studio中的编译又成功了
在我的例子中，问题是当我从源代码管理中提取源代码时，解决方案中的 class 库项目之一通过绝对路径引用了 AspNetCore.Identity 库。因此 - project.fragment.lock.json 文件中生成了错误的路径，解决方案无法构建。
修复 .csproj 文件中的绝对路径引用使其工作。