Get-HttpQueryString.ps1

function Get-HttpQueryString
{
    [CmdletBinding()]
    param 
    (
        [Parameter(Mandatory = $true)]
        [String]
        $Uri,

        [Parameter(Mandatory = $true)]
        [Hashtable]
        $QueryParameter
    )

    # Add System.Web
    Add-Type -AssemblyName System.Web

    # Create a http name value collection from an empty string
    $nvCollection = [System.Web.HttpUtility]::ParseQueryString([String]::Empty)

    foreach ($key in $QueryParameter.Keys)
    {
        $nvCollection.Add($key, $QueryParameter.$key)
    }

    # Build the uri
    $uriRequest = [System.UriBuilder]$uri
    $uriRequest.Query = $nvCollection.ToString()

    return $uriRequest.Uri.OriginalString
}