Simple Pagination with MVC3 + Twitter Bootstrap

_Pager.cshtml

@model IPaginate

<div class="pagination pagination-centered">
    <ul>
        @for (int i = 1; i <= Model.PageCount; i += 1)
        {
            string cls = "";
            if (i == Model.Page)
            {
                cls += " active";
            }
            
            <li class="@cls"><a href="@GetPagedUrl(i)">@i</a></li>
        }
    </ul>
</div>

@functions
{

    private bool HasPageInQuery
    {
        get
        {
            var url = Request.Url;
            if (url == null)
                return false;
            var query = url.Query;
            return System.Text.RegularExpressions.Regex.IsMatch(query, @"[?&]Page=\d+");
        }
    }
    
    private bool HasQuery
    {
        get 
        { 
            var url = Request.Url;
            if (url == null)
                return false;

            return !string.IsNullOrEmpty(url.Query);
        }
    }

    private string GetPagedUrl(int page)
    {
        var pageQuery = string.Format("Page={0}", page); 
        if (HasPageInQuery)       
            return System.Text.RegularExpressions.Regex.Replace(Request.Url.Query, @"Page=\d+", pageQuery);
        
        if (HasQuery)
            return Request.Url + "&" + pageQuery;

        return Request.Url + "?" + pageQuery;
    }

}

IPaginate.cs

/// <summary>
/// Indicates that a model provides support for pagination.
/// See http://twitter.github.com/bootstrap/components.html#pagination.
/// </summary>
public interface IPaginate
{
    /// <summary>
    /// Gets the current page in the record set.
    /// </summary>
    int Page { get; }

    /// <summary>
    /// Gets the total number of pages in the record set.
    /// </summary>
    int PageCount { get; }
}