问当SVG过大时通过XMLSerializer发送SVG内容不起作用

EN

function saveSVG() {
        var rack = document.getElementsByClassName("cwRacksSvgImg");
        var markupTOs = '';
        var script = associados.slice();

        for (var i = 0; i < rack.length; i++) {
            markupTOs = markupTOs + (new XMLSerializer()).serializeToString(rack[i]);
        }

        var svg = document.getElementsByTagName('svg')[0];
        var floor_id = document.getElementById('floor_id').value;
        var markup = (new XMLSerializer()).serializeToString(svg);
        $.ajax({
            type: 'Post',
            dataType: 'json',
            url: '/Planta/SavePlanta/',
            data: JSON.stringify({
                markup: markup,
                markupTOs: markupTOs,
                floor_id: floor_id,
                script: script
            }),
            contentType: 'application/json; charset=utf-8',
            success: function (data) {
            }
        });
    }

public ActionResult SavePlanta(string markup, string markupTOs, int floor_id, string[] script) {

var bytes = Encoding.UTF8.GetBytes(markup);

}