MVC中有多種方式從前端向后臺 controller action 方法傳遞參數值。
一、使用AJAX與后臺交互
1. 利用FormData對象
栗子：前端：

 function GetAttendanceList() {    var qData = new FormData();qData.append("practiceDt", $("#practiceDate").val());//參數：訓練日期qData.append("addDays", "1"); //參數：增加的天數var __RequestVerificationToken = $.trim($('input[name$="__RequestVerificationToken"]').val()).replace(/['"]+/g, '');     formData.append("__RequestVerificationToken", __RequestVerificationToken);$.ajax({url: '@Url.Action("***ActionName***", "***ControllerName***")',data: qData,dataType: "json",cache: false,contentType: false,processData: false,type: "POST",success: function (data) { 
......},error: function (xhr, status, error) {..... }});}

后端：

 [HttpPost]       [Authorize(Policy = "****PolicyName****")][ValidateAntiForgeryToken]public IActionResult AttendanceList(SearchAttendanceViewModel search,string addDays) //SearchAttendanceViewModel{           if (!ModelState.IsValid){return View();}.... 省略}public class SearchAttendanceViewModel{public DateTime? attendanceDtFr { set; get; }public DateTime? attendanceDtTo { set; get; }public string staffBy { set; get; }public string trainingPlace { set; get; }        public DateTime? practiceDt { set; get; }}

這樣，我們利用參數的自動綁定，將SearchAttendanceViewModel.practiceDt 和 addDays參數從前端傳遞到后端。

擴展： JS FormData對象
(待續)