c# - "Object reference not set to an instance of an object" while sending JSON to a webservice using JQuery/AJAX -

-

edit: after figuring out how step through code appears an exception of type 'system.nullreferenceexception' occurred in datamanagement.dll not handled in user code. happens in line:

string path = httpcontext.current.server.mappath(@"~\desktopmodules\datamanagement\pdf\" + 0 + ".pdf");

i'm not sure means sheds more light on problem.

i trying send javascript object web service , getting 500 error: "object reference not set instance of object".

i'm positive passing out of format method in web service i'm not sure. can awesome i'm beginner , have been ramming head against wall on forever.

json (from fiddler):

{"sampleids":["1"],"line1":"","line2":"","line3":"","labeltype":"soil","startinglabelposition":1}

javascript:

var labelinfo = new object(); labelinfo.sampleids = sampleids; labelinfo.line1 = $('#ddlgrower').val(); labelinfo.line2 = $('#ddlfarm').val(); labelinfo.line3 = $('#ddlfield1').val(); labelinfo.labeltype = $('#ddlsoilloginmatrix option:selected').text(); labelinfo.startinglabelposition = parseint($('#labelselection').text());  $.ajax({     type: "post",     url: "desktopmodules/datamanagement/testservice.svc/createlabelpdf",     data: json.stringify(labelinfo),     contenttype: "application/json; charset=utf-8",     datatype: "json",     success: function(data) {         window.open(data.d);     },     error:  function(msg) {         alert("error: " + msg.status);     } });

c# web service:

[operationcontract] public string createlabelpdf(list<string> sampleids, string line1, string line2, string line3, string labeltype, int startinglabelposition) {    list<labelcontent> labels = new list<labelcontent>();     foreach (var sample in sampleids)    {       labelcontent labelcontent = new labelcontent();       labelcontent.line1 = line1;       labelcontent.line2 = line2;       labelcontent.line3 = line3;       labelcontent.labelid = sample;       labels.add(labelcontent);    }        creator creator = new creator    {       includelabelborders = false    };    string path = httpcontext.current.server.mappath(@"~\desktopmodules\datamanagement\pdf\" + 0 + ".pdf");    creator.printlabels(labels, new avery5160(), path, startinglabelposition);    return path; }

the json seems invalid. think should start with: 

{"sampleids":["1"],"line1":"","line2":"","line3":"","labeltype":"soil","startinglabelposition":1}

right sampleids this:

{"sampleids:["1"],"line1":"","line2":"","line3":"","labeltype":"soil","startinglabelposition":1}

that is, "sampleids" not formatted key.


Comments

Post a Comment

Popular posts from this blog

c++ - OpenCV Error: Assertion failed <scn == 3 ::scn == 4> in unknown function, -

-
i read alot other solution still confused should mine... #include <opencv2/objdetect/objdetect.hpp> #include <opencv2/highgui/highgui.hpp> #include <opencv2/imgproc/imgproc.hpp> #include <iostream> #include <stdio.h> using namespace std; using namespace cv; int main(int argc, const char** argv) { //create cascade classifier object used face detection cascadeclassifier face_cascade; //use haarcascade_frontalface_alt.xml library face_cascade.load("haarcascade_frontalface_alt.xml"); //setup video capture device , link first capture device videocapture capturedevice; capturedevice.open(0); //setup image files used in capture process mat captureframe; mat grayscaleframe; //create window present results namedwindow("outputcapture", 1); //create loop capture , find faces while (true) { //capture new image frame capturedevice >> captureframe; ...
Read more

php - render data via PDO::FETCH_FUNC vs loop -

-
i've been using 2 methods render data. the first one: function name($id,$name){ return '<div id="'.$id.'">'.$name.'</div>'; } echo implode($pdo->query("select id,name user")->fetchall(pdo::fetch_func,'name')); the second one: $users = $pdo->query("select id,name user")->fetchall(pdo::fetch_obj); foreach($users $user){ echo name($user->id,$user->name); } i don't understand how pdo::fetch_func works. tried figure out. however, not well-documented. could please explain fetch mode? , also, 1 performs better? thank you. both methods wrong , have learn how use templates , how separate business logic presentation logic. $users = $pdo->query("select id,name user")->fetchall(pdo::fetch_obj); tpl::assign('users', $users); is code business logic part. then in template <?php foreach $users $row): ?> <div id="<?=$...
Read more

The canvas has been tainted by cross-origin data in chrome only -

-
uncaught securityerror: failed execute 'getimagedata' on 'canvasrenderingcontext2d': canvas has been tainted cross-origin data i getting above error in chrome. code(following) works fine in mozilla. have not corss domain issue. why above error in chrome? var wheel_canvas, wheel_context, can_w, can_h, wheel_grd; var large_radius = 160; var small_radius = 120; var wheel_canvas = document.getelementbyid('wheel_canvas'); var wheel_context = wheel_canvas.getcontext('2d'); var can_w = $(wheel_canvas).width(); var can_h = $(wheel_canvas).height(); var centerx = can_w / 2, centery = can_h / 2; var wheel_grd = null; test('#ff0000'); function test(hex) { $('#clrpicker').css({'left': 210, 'top': 210 }); inverted = hexbw(hex); $('#color_val_show').val(hex); current_color_hex_val_selected = hex; $('#color_val_show').css({'color':inverted,'background':hex}); fillgradient...
Read more