“startIndex 不能大于字符串长度”：使用 Unity nuget 包时出现奇怪错误

Question

我使用

Package Manager Console

将

Unity

package 安装到位于

c:\%SOLUTION_BASE_PATH%\SomeFolder\SomeInnerFolder2\ParticularSolutionFolder

中的 .NET Framework 4.5.2 中的遗留项目中。我使用这个命令：

  Install-Package -ProjectName $ProjectName -Id Unity -Version 2.1.505.2 -Source nuget.org -Verbose -FileConflictAction IgnoreAll -ErrorAction Stop -WarningAction Ignore -IncludePrerelease

一切都很好，运作良好。现在我想更改

repositoryPath

中的

nuget.config

以将所有解决方案的所有包安装到同一个文件夹中。我将以下行添加到

nuget.config

:

<config>
   <add key="repositoryPath" value="c:\%SOLUTION_BASE_PATH%\packages" />
</config>

大多数情况下它也工作得很好，但是

Unity

包给了我以下输出并失败了。

一开始可以正常工作：

    Added package 'Unity.2.1.505.2' to folder 'c:\%SOLUTION_BASE_PATH%\packages' from source '
    https://api.nuget.org/v3/index.json'
    Added reference 'Microsoft.Practices.Unity.Configuration' to project:'X'. The Reference was Resolved To Package (resolvedToPackage):'True', where Reference Path from DTE(dteOriginalPath):'C:\%SOLUTION_BASE_PATH%\packages\Unity.2.1.505.2\lib\NET35\Microsoft.Practices.Unity.Configuration.dll' and Reference Path from package reference(assemblyFullPath):'c:\%SOLUTION_BASE_PATH%\packages\Unity.2.1.505.2\lib\NET35\Microsoft.Practices.Unity.Configuration.dll'.
    Added reference 'Microsoft.Practices.Unity' to project:'X'. The Reference was Resolved To Package (resolvedToPackage):'True', where Reference Path from DTE(dteOriginalPath):'C:\%SOLUTION_BASE_PATH%\packages\Unity.2.1.505.2\lib\NET35\Microsoft.Practices.Unity.dll' and Reference Path from package reference(assemblyFullPath):'c:\%SOLUTION_BASE_PATH%\packages\Unity.2.1.505.2\lib\NET35\Microsoft.Practices.Unity.dll'.
    Added package 'Unity.2.1.505.2' to 'packages.config'

但随后失败并出现以下错误：

    Executing script file 'c:\%SOLUTION_BASE_PATH%\packages\Unity.2.1.505.2\tools\install.ps1'
    Exception calling "Substring" with "1" argument(s): "startIndex cannot be larger than length of string.
    Parameter name: startIndex"
    At C:\%SOLUTION_BASE_PATH%\packages\Unity.2.1.505.2\tools\Utils.psm1:71 char:12
    +     return ($targetPath.Substring($basePath.Length)).TrimStart([Syste ...
    +            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
        + FullyQualifiedErrorId : ArgumentOutOfRangeException

然后它只会删除受影响的软件包：

    Removed package 'Unity.2.1.505.2 : CommonServiceLocator [1.0.0, )' from 'packages.config'
    Removed reference 'Microsoft.Practices.Unity.Configuration.dll' from project 'X'
    Removed reference 'Microsoft.Practices.Unity.dll' from project 'X'
    Removed package 'CommonServiceLocator.1.0.0' from 'packages.config'
    ...

并且整个运行失败：

    ...
    Executing nuget actions took 5.91 sec
    The running command stopped because the preference variable "ErrorActionPreference" or common parameter is set to Stop: Cannot bind argument to parameter 'Path' because it is null.

它只发生在我的工作机器上，所以当我在另一台机器上尝试它时，它不会出现任何问题，因此我可以检查失败的包内的内容。失败的文件只有这些行：

    param($installPath, $toolsPath, $package, $project)

    Import-Module (Join-Path $toolsPath Utils.psm1)

    $relativeInstallPath = Get-RelativePath ([System.Io.Path]::GetDirectoryName($dte.Solution.FullName)) $installPath

    $folder = (Join-Path (Join-Path $relativeInstallPath "lib")  "NET35")

    Add-ToolFolder $folder

失败的函数放置在 Utils.psm1 中：

    function Get-RelativePath([System.String] $basePath, [System.String] $targetPath)
    {
        # not a general purpose relative path calculation algorithm
        
        return ($targetPath.Substring($basePath.Length)).TrimStart([System.Io.Path]::DirectorySeparatorChar)
    }

但是，我还不确定这里到底出了什么问题。如有任何帮助，我们将不胜感激。

Answer 1

该消息暗示 $basePath 的（字符串）“长度”比字符串“$targetPath”“更长”，并且使用此“长度”作为 $targetPath 的“偏移量”（通过子字符串）会导致“startIndex”问题。您需要确认相关变量的内容。 （即确认“$targetPath”实际上比“$basePath”更长；显示的代码中没有分配）

公共字符串子字符串（int startIndex）；