c# – URI Comparer忽略查询字符串顺序

比较两个URI可以使用 System.Uri.Compare完成.
但是,将http://example.com/pages?pageStart=100\u0026amp;pageSize=50与http://example.com/pages?pageSize=50\u0026amp;pageStart=100进行比较表示两个URI不同.有没有办法让比较忽略值在查询字符串中出现的顺序;从功能上讲,这两个URI是相同的.

我正在考虑编写一个包装器方法,在调用标准比较函数之前按顺序放置查询字符串参数,但是想先检查一下是否有开箱即用的解决方案,因为比较不会显得很奇怪已经有了这个选项.

更新

这是我提出的用于比较两个URI的解决方案,无论它们的查询字符串参数顺序如何.如上所述,这是通过首先对每个URI的查询字符串进行排序来实现的.但是,如果.net中存在现有解决方案,我宁可放弃我的代码和放大器.用那个.

function CompareUri ($GivenUri,$ShouldBeUri) {
    $uriComponentsOptions = ([UriComponents]::AbsoluteUri)
    $uriFormatOptions = ([UriFormat]::SafeUnescaped)
    $stringComparisonoptions = ([StringComparison]::OrdinalIgnoreCase)
    $a = OrderUriQueryString($GivenUri)
    $b = OrderUriQueryString($ShouldBeUri)
    [Uri]::Compare($a,$b,$uriComponentsOptions,$uriFormatOptions,$stringComparisonoptions)
}

function OrderUriQueryString($Uri) {
    [System.UriBuilder]$UriBuilder = New-Object -TypeName 'System.UriBuilder' -ArgumentList $Uri
    [System.Collections.Specialized.NameValueCollection]$Query = [System.Web.HttpUtility]::ParseQueryString($UriBuilder.Query)
    [System.Collections.Specialized.NameValueCollection]$Query2 = [System.Web.HttpUtility]::ParseQueryString('') #we have to initialise this way as HttpValueCollection has no public constructor (https://referencesource.microsoft.com/#system.web/HttpValueCollection.cs,fde6b9ec5f1ed58a,references)  
    $Query.AllKeys | sort | %{ $Query2.Add($_,$Query[$_]) }
    $UriBuilder.Query = $Query2.ToString()
    $UriBuilder.ToString()
}

解决方法

我知道这与你做的基本相同,但是如果你真的只是希望比较在代码中看起来更简洁,你可以使用Update-TypeData修改System.Uri类型并使用它而不是两个单独的函数.它不是原生的.NET,基本上使用的是相同的代码,但至少比较的调用看起来更清晰.

Update-TypeData -MemberType "ScriptMethod" -MemberName "SortedQueryStringCompare" -TypeName "System.Uri" -ErrorAction "SilentlyContinue" -Value {
    Param (
        [System.URI]$ComparingURI
    )

    $Sorter = {
        $UriBuilder = [System.UriBuilder]$args[0]

        $UnsortedQuery = [System.Web.HttpUtility]::ParseQueryString($UriBuilder.Query)
        $SortedQuery = [System.Web.HttpUtility]::ParseQueryString([String]::Empty)
        $UnsortedQuery.AllKeys | sort-object | ForEach-Object { 
            $SortedQuery.Add($_,$UnsortedQuery[$_])
        }

        $UriBuilder.Query = $SortedQuery.ToString()
        return $UriBuilder.ToString()
    }

    $UriComponentsOptions = ([UriComponents]::AbsoluteUri)
    $UriFormatOptions = ([UriFormat]::SafeUnescaped)
    $StringComparisonoptions = ([StringComparison]::OrdinalIgnoreCase)
    $OriginUriString = . $Sorter $This
    $ComparingUriString = . $Sorter $ComparingURI

    return [System.Uri]::Compare($OriginUriString,$ComparingUriString,$UriComponentsOptions,$UriFormatOptions,$StringComparisonoptions)
}

$e1 = [System.Uri]"http://example.com/pages?pageStart=100&pageSize=50"
$e2 = [System.Uri]"http://example.com/pages?pageSize=50&pageStart=100"

$e1.sortedQueryStringCompare($e2)

或者只是使用SortQueryString方法执行此操作,并将其用于比较调用

Update-TypeData -MemberType "ScriptMethod" -MemberName "SortQueryString" -TypeName "System.Uri" -ErrorAction "SilentlyContinue" -Value {
    $UriBuilder = [System.UriBuilder]$this

    $UnsortedQuery = [System.Web.HttpUtility]::ParseQueryString($UriBuilder.Query)
    $SortedQuery = [System.Web.HttpUtility]::ParseQueryString([String]::Empty)
    $UnsortedQuery.AllKeys | sort-object | ForEach-Object { 
        $SortedQuery.Add($_,$UnsortedQuery[$_])
    }

    $UriBuilder.Query = $SortedQuery.ToString()
    return [System.Uri]$UriBuilder.ToString()
}

$UriComponentsOptions = ([UriComponents]::AbsoluteUri)
$UriFormatOptions = ([UriFormat]::SafeUnescaped)
$StringComparisonoptions = ([StringComparison]::OrdinalIgnoreCase)

$e1 = [System.Uri]"http://example.com/pages?pageStart=100&pageSize=50"
$e2 = [System.Uri]"http://example.com/pages?pageSize=50&pageStart=100"

[System.Uri]::Compare($e1.sortQueryString(),$e2.sortQueryString(),$StringComparisonoptions)