ajax pass array to backend .net MVC controller

 

The array structure is:  [ "5ae92c2786f3591b2cff1be5", "5ae91bb7ca673569a8d23a6e" ]

Front desk code:

$.ajax({
                    type: "POST",
                    url: "/Registration/ManagementProject/DeleteProjectById",
                    dataType: "json",
                    data: {"selectData": that.UserIdArray },
                    async: false,
                    traditional: true , // set to true here 
                    success: function (data) {
                        that.projectList = data;
                        console.log(data)
                        if (data.Response.ErrCode == "0") {
                            alert(data.Response.ErrMsg);
                            // Clear the selected data 
                            that.UserIdArray = [];
                            appList.GatProjectList( 1 );
                        }
                    }
                });

Notice:

Notice:

1. that.UserIdArray is an array

2. The data in the ajax parameter is {"selectData": that.UserIdArray }

3. The most important thing in this way is traditional: true. Or convert the _list parameter to $.param(_list.true). Here is actually passing _list to the background as a traditional way, jQuery does the conversion by default

code behind

 // / <summary> 
       // / Delete items according to the selected ID 
       // / </summary> 
       // / <param name="selectData">The selected item array can also be List<string></param> 
       // / <returns></returns> 
        public IActionResult DeleteProjectById(string [] selectData)
        {
        }