dotnetcore-api-urls.cs

public class ApiContext : IApiContext
{
    private readonly string _baseUri;

    public ApiContext(string baseUri)
    {
        _baseUri = baseUri;
    }

    public Uri GetPageUri(PaginationFilter filter, string route)
    {
        var _enpointUri = new Uri(string.Concat(_baseUri, route));

        var modifiedUri = QueryHelpers.AddQueryString(_enpointUri.ToString(), "pageNumber", filter.PageNumber.ToString());
        modifiedUri = QueryHelpers.AddQueryString(modifiedUri, "pageSize", filter.PageSize.ToString());

        return new Uri(modifiedUri);
    }
}

Code from: https://www.codewithmukesh.com/blog/pagination-in-aspnet-core-webapi/