Check which file is not linked to web page using jQuery in ASP.Net

Hi Prasunjeet,

Check this example. Now please take its reference and correct your code.

HTML

<div>
    <a href="Files/Test.doc">Test.doc</a><hr />
    <img src="Files/Test.jpg" height="100px" width="100px" />
    <br />
    <input type="button" id="btnOnCheck" value="Check File" />
</div>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript">
    $(function () {
        $('#btnOnCheck').on('click', function () {
            var anchors = $('a');
            var images = $('img');
            var filesUsed = [];
            $.each(anchors, function () {
                filesUsed.push($(this).attr('href'));
            });
            $.each(images, function () {
                filesUsed.push($(this).attr('src'));
            });
            $.ajax({
                type: "POST",
                url: "Default.aspx/CheckFiles",
                data: JSON.stringify({ files: filesUsed }),
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: function (r) {
                    var message = "Unused Files are\n----------------------\n";
                    $.each(r.d, function () {
                        message += $(this)[0] + "\n";
                    });
                    alert(message);
                }, error: function (r) {
                    alert(r.d);
                }
            });
        });
    });
</script>

Code

C#

[System.Web.Services.WebMethod]
public static string[] CheckFiles(string[] files)
{
    List<string> filesUsed = new List<string>();
    foreach (string file in files)
    {
        filesUsed.Add(HttpContext.Current.Server.MapPath("~/") + file.Replace("/", "\\"));
    }

    string[] filePaths = System.IO.Directory.GetFiles(HttpContext.Current.Server.MapPath("~/Files/"));

    List<string> filesUnUsed = (from s in filePaths
                                where !filesUsed.Contains(s)
                                select System.IO.Path.GetFileName(s)).ToList();

    return filesUnUsed.ToArray(); ;
}

VB.Net

<System.Web.Services.WebMethod()>
Public Shared Function CheckFiles(ByVal files As String()) As String()
    Dim filesUsed As List(Of String) = New List(Of String)()

    For Each file As String In files
        filesUsed.Add(HttpContext.Current.Server.MapPath("~/") & file.Replace("/", "\"))
    Next

    Dim filePaths As String() = System.IO.Directory.GetFiles(HttpContext.Current.Server.MapPath("~/Files/"))
    Dim filesUnUsed As List(Of String) = (From s In filePaths _
                                          Where Not filesUsed.Contains(s) _
                                          Select System.IO.Path.GetFileName(s)).ToList()
    Return filesUnUsed.ToArray()
End Function

Screenshot