在visual studio 2019中右键单击Dotnet核心项目，您将看到一个删除未使用引用的选项。

ReSharper 2016.1有一个功能，删除未使用的NuGet。

它可以在解决方案上运行，也可以在解决方案中的每个项目上运行，它做以下事情:

分析代码并收集对程序集的引用。 基于程序集的使用构建NuGet使用图。 没有内容文件、未使用本身和未使用依赖项的包被假定为未使用并建议删除。

不幸的是，这对项目不起作用。json项目(RSRP-454515)和ASP。NET核心项目(RSRP-459076)

下面是一个小PowerShell脚本，它为。net Core / . net 5+项目查找多余的NuGet包。对于每个项目文件，它删除每个引用一次，并检查它是否编译。这要花很多时间。在此之后，您将得到可能被排除的每个引用的摘要。最后，应该删除哪些内容是由你决定的。大多数情况下，您不可能删除它建议的所有内容(由于依赖关系)，但它应该为您提供一个良好的起点。

将下面的脚本保存为ps1文件，并将第89行中的字符串C:\MySolutionDirectory替换为您想要扫描的目录，然后运行ps1文件。先做备份，以防出现问题。

function Get-PackageReferences {
    param($FileName, $IncludeReferences, $IncludeChildReferences)

    $xml = [xml] (Get-Content $FileName)

    $references = @()

    if($IncludeReferences) {
        $packageReferences = $xml | Select-Xml -XPath "Project/ItemGroup/PackageReference"

        foreach($node in $packageReferences)
        {
            if($node.Node.Include)
            {
                if($node.Node.Version)
                {
                    $references += [PSCustomObject]@{
                        File = (Split-Path $FileName -Leaf);
                        Name = $node.Node.Include;
                        Version = $node.Node.Version;
                    }
                }
            }
        }
    }

    if($IncludeChildReferences)
    {
        $projectReferences = $xml | Select-Xml -XPath "Project/ItemGroup/ProjectReference"

        foreach($node in $projectReferences)
        {
            if($node.Node.Include)
            {
                $childPath = Join-Path -Path (Split-Path $FileName -Parent) -ChildPath $node.Node.Include

                $childPackageReferences = Get-PackageReferences $childPath $true $true

                $references += $childPackageReferences
            }
        }   
    }

    return $references
}

function Get-ProjectReferences {
    param($FileName, $IncludeReferences, $IncludeChildReferences)

    $xml = [xml] (Get-Content $FileName)

    $references = @()

    if($IncludeReferences) {
        $projectReferences = $xml | Select-Xml -XPath "Project/ItemGroup/ProjectReference"

        foreach($node in $projectReferences)
        {
            if($node.Node.Include)
            {
                $references += [PSCustomObject]@{
                    File = (Split-Path $FileName -Leaf);
                    Name = $node.Node.Include;
                }
            }
        }
    }

    if($IncludeChildReferences)
    {
        $projectReferences = $xml | Select-Xml -XPath "Project/ItemGroup/ProjectReference"

        foreach($node in $projectReferences)
        {
            if($node.Node.Include)
            {
                $childPath = Join-Path -Path (Split-Path $FileName -Parent) -ChildPath $node.Node.Include

                $childProjectReferences = Get-ProjectReferences $childPath $true $true

                $references += $childProjectReferences
            }
        }   
    }

    return $references
}

$files = Get-ChildItem -Path C:\MySolutionDirectory -Filter *.csproj -Recurse

Write-Output "Number of projects: $($files.Length)"

$stopWatch = [System.Diagnostics.Stopwatch]::startNew()

$obseletes = @()

foreach($file in $files) {

    Write-Output ""
    Write-Output "Testing project: $($file.Name)"

    $rawFileContent = [System.IO.File]::ReadAllBytes($file.FullName)

    $childPackageReferences = Get-PackageReferences $file.FullName $false $true
    $childProjectReferences = Get-ProjectReferences $file.FullName $false $true

    $xml = [xml] (Get-Content $file.FullName)

    $packageReferences = $xml | Select-Xml -XPath "Project/ItemGroup/PackageReference"
    $projectReferences = $xml | Select-Xml -XPath "Project/ItemGroup/ProjectReference"

    $nodes = @($packageReferences) + @($projectReferences)

    foreach($node in $nodes)
    {
        $previousNode = $node.Node.PreviousSibling
        $parentNode = $node.Node.ParentNode
        $parentNode.RemoveChild($node.Node) > $null

        if($node.Node.Include)
        {
            $xml.Save($file.FullName)

            if($node.Node.Version)
            {
                $existingChildInclude = $childPackageReferences | Where-Object { $_.Name -eq $node.Node.Include -and $_.Version -eq $node.Node.Version } | Select-Object -First 1

                if($existingChildInclude)
                {
                    Write-Output "$($file.Name) references package $($node.Node.Include) ($($node.Node.Version)) that is also referenced in child project $($existingChildInclude.File)."
                    continue
                }
                else 
                {
                    Write-Host -NoNewline "Building $($file.Name) without package $($node.Node.Include) ($($node.Node.Version))... "
                }
            }
            else
            {
                $existingChildInclude = $childProjectReferences | Where-Object { $_.Name -eq $node.Node.Include } | Select-Object -First 1

                if($existingChildInclude)
                {
                    Write-Output "$($file.Name) references project $($node.Node.Include) that is also referenced in child project $($existingChildInclude.File)."
                    continue
                }
                else 
                {
                    Write-Host -NoNewline "Building $($file.Name) without project $($node.Node.Include)... "
                }
            }
        }
        else 
        {
            continue
        }

        dotnet build $file.FullName > $null

        if($LastExitCode -eq 0)
        {
            Write-Output "Building succeeded."

            if($node.Node.Version)
            {
                $obseletes += [PSCustomObject]@{
                    File = $file;
                    Type = 'Package';
                    Name = $node.Node.Include;
                    Version = $node.Node.Version;
                }
            }
            else
            {
                $obseletes += [PSCustomObject]@{
                    File = $file;
                    Type = 'Project';
                    Name = $node.Node.Include;
                }
            }
        }
        else 
        {
            Write-Output "Building failed."
        }


        if($null -eq $previousNode)
        {
            $parentNode.PrependChild($node.Node) > $null
        } 
        else 
        {
            $parentNode.InsertAfter($node.Node, $previousNode.Node) > $null
        }

        # $xml.OuterXml

        $xml.Save($file.FullName)
    }

    [System.IO.File]::WriteAllBytes($file.FullName, $rawFileContent)

    dotnet build $file.FullName > $null

    if($LastExitCode -ne 0)
    {
        Write-Error "Failed to build $($file.FullName) after project file restore. Was project broken before?"
        return
    }
}

Write-Output ""
Write-Output "-------------------------------------------------------------------------"
Write-Output "Analyse completed in $($stopWatch.Elapsed.TotalSeconds) seconds"
Write-Output "$($obseletes.Length) reference(s) could potentially be removed."

$previousFile = $null
foreach($obselete in $obseletes)
{
    if($previousFile -ne $obselete.File)
    {
        Write-Output ""
        Write-Output "Project: $($obselete.File.Name)"
    }

    if($obselete.Type -eq 'Package')
    {
        Write-Output "Package reference: $($obselete.Name) ($($obselete.Version))"
    }
    else
    {
        Write-Output "Project refence: $($obselete.Name)"
    }

    $previousFile = $obselete.File
}

你可以在这里找到更多信息:https://devblog.pekspro.com/posts/finding-redundant-project-references

你可以使用Visual Studio扩展ResolveUR -解析未使用的引用。

通过解决方案和项目节点的菜单项解决方案资源管理器工具窗口解决Visual Studio 2012/2013/2015项目中未使用的引用，包括nuget引用

这不是一项容易的任务，所以我建议在此之前进行备份和/或提交，以便在出现错误时进行回滚。

这是体力劳动，但很有效。

使用ReSharper或类似的代码分析工具来识别项目中任何未使用的引用，并卸载相应项目中的nuget。 有时卸载的NuGet仍然停留在“管理NuGet包”对话框中的“已安装包”和“更新”列表中。关闭Visual Studio，然后删除packages文件夹，然后重新打开解决方案并恢复您的块。

你可以使用ReSharper 2019.1.1来实现。

右键单击项目>重构>删除未使用的引用。

如果你的项目很小，你也可以使用:项目>优化使用的引用…

弹出一个窗口。选择所有引用并删除它们。然后返回并重新添加那些导致编译器错误的代码。