c# - JSON-data to WebMethod using jQuery returning errors -

i'm trying send json list populated id's 'data-seq' attribute when 'value' == true.

i have tried out lot solution keeps getting me error messages, common "there no parameterless constructor type string" when using string[] or "string not supported deserialization of array" when using string code-behind parameter in webmethod.

function sentdata() {             var json = [];     $('.btn[value="true"]').each(function () {         var obj = {             id: $(this).attr("data-seq")         };         json.push(obj);     });     json = json.stringify({ jsonlist: json });     console.log(json); // {"jsonlist":[{"id":"38468"},{"id":"42443"},{"id":"42444"}]} (the right id's getting stored)      $.ajax({         type: "post",         async: true,         url: "default.aspx/getlist",         datatype: "json",         data: json,         contenttype: "application/json; charset=utf-8",         error: function (jqxhr, textstatus, errorthrown) {             console.log('bad, ' + errorthrown + ", " + jqxhr.responsetext + ", " + textstatus);         },         success: function(json){             //do result         }     });     return false; }  // code-behind [webmethod] [scriptmethod(usehttpget = false)] public static void getlist(string jsonlist) {     // string: string not supported deserialization of array     // string[]: there no parameterless constructor type string } 

you sending ids send them comma-separated string this:

function sentdata() {             var json = [];     $('.btn[value="true"]').each(function () {         var id = $(this).attr("data-seq")         json.push(id);     });      $.ajax({         type: "post",         async: true,         url: "default.aspx/getlist",         datatype: "json",         data: '{jsonlist: "' + json + '" }',         contenttype: "application/json; charset=utf-8",         error: function (jqxhr, textstatus, errorthrown) {             console.log('bad, ' + errorthrown + ", " + jqxhr.responsetext + ", " + textstatus);         },         success: function(json){             //do result         }     });     return false; } 

and code-behind:

[webmethod] [scriptmethod(usehttpget = false)] public static void getlist(string jsonlist) {     list<string> listofids = jsonlist.split(',').tolist(); }