一丶ActionResult

應用于Action方法前面的類型,它是Action的返回值，代表Action的執行結果。

public ActionResult Index()
{ return View();
}

二丶JsonResult

返回Json字符串,但ajax接受到后，會自動轉換成Json對象進行使用。

public ActionResult Val1()
{ 

//生成3個隨機數 

   Random rd = new Random(); 

 var a = rd.Next(1, 1000); 

 var b = rd.Next(10, 1000); 

 var c = rd.Next(100, 1000); 

//申明一個匿名類

   var msg = new {
                a1 = a,
                a2 = b,
                a3 = c,
            }; 

 return Json(msg);
} 

三丶JavaScriptResult

通過后臺返給前端js代碼。

public ActionResult GetJs()
 {
     return JavaScript("alert('我是js代碼,調用的是JavaScriptResult')");
}
public ActionResult GetJs2()
{
     return Content("alert('我是js代碼，調用的是ContentResult，并自定義的返回類型為js')", "application/x-javascript");
} 

四丶FileResult

應用于下載文件

 public FileResult DownLoadExcel(StudentInfo studentInfo, Student_Photo student_Photo, string dateStart, string dateEnd)
{
   List<StuInfoAndImg> stuInfoAndImgList = GetStu_List(studentInfo, student_Photo, dateStart, dateEnd); 

 string pathFileName = string.Empty;

 ExportStudentExcel(stuInfoAndImgList, out pathFileName); 

 string fileName = DateTime.Now.ToString("yyyyMMddHHmmssffffff") + ".xlsx"; 

 return File(pathFileName, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", fileName);
}