JsonResult上传文件并保存在DB MVC中

Question

如何使用Json / Ajax为现有方法上传文件，如下所示。 它目前为HttpPostedFileBase传递null。有什么建议??

例如

---- Bounded queue instance = class java.util.concurrent.ArrayBlockingQueue -------------
poolSize = 1, corePoolSize = 2, queueSize = 0, queueRemainingCapacity = 3, maximumPoolSize = 5, totalTasksSubmitted = 1
poolSize = 2, corePoolSize = 2, queueSize = 0, queueRemainingCapacity = 3, maximumPoolSize = 5, totalTasksSubmitted = 2
poolSize = 2, corePoolSize = 2, queueSize = 1, queueRemainingCapacity = 2, maximumPoolSize = 5, totalTasksSubmitted = 3
poolSize = 2, corePoolSize = 2, queueSize = 2, queueCapacity = 1, maximumPoolSize = 5, totalTasksSubmitted = 4
poolSize = 2, corePoolSize = 2, queueSize = 3, queueRemainingCapacity = 0, maximumPoolSize = 5, totalTasksSubmitted = 5
poolSize = 3, corePoolSize = 2, queueSize = 3, queueRemainingCapacity = 0, maximumPoolSize = 5, totalTasksSubmitted = 6
poolSize = 4, corePoolSize = 2, queueSize = 3, queueRemainingCapacity = 0, maximumPoolSize = 5, totalTasksSubmitted = 7
poolSize = 5, corePoolSize = 2, queueSize = 3, queueRemainingCapacity = 0, maximumPoolSize = 5, totalTasksSubmitted = 8
Task rejected = 9
poolSize = 5, corePoolSize = 2, queueSize = 3, queueRemainingCapacity = 0, maximumPoolSize = 5, totalTasksSubmitted = 9
Task rejected = 10
poolSize = 5, corePoolSize = 2, queueSize = 3, queueRemainingCapacity = 0, maximumPoolSize = 5, totalTasksSubmitted = 10
--------------------

---- Unbounded queue instance = class java.util.concurrent.LinkedBlockingDeque -------------
poolSize = 1, corePoolSize = 2, queueSize = 0, queueRemainingCapacity = 2147483647, maximumPoolSize = 5, totalTasksSubmitted = 1
poolSize = 2, corePoolSize = 2, queueSize = 0, queueRemainingCapacity = 2147483647, maximumPoolSize = 5, totalTasksSubmitted = 2
poolSize = 2, corePoolSize = 2, queueSize = 1, queueRemainingCapacity = 2147483646, maximumPoolSize = 5, totalTasksSubmitted = 3
poolSize = 2, corePoolSize = 2, queueSize = 2, queueRemainingCapacity = 2147483645, maximumPoolSize = 5, totalTasksSubmitted = 4
poolSize = 2, corePoolSize = 2, queueSize = 3, queueRemainingCapacity = 2147483644, maximumPoolSize = 5, totalTasksSubmitted = 5
poolSize = 2, corePoolSize = 2, queueSize = 4, queueRemainingCapacity = 2147483643, maximumPoolSize = 5, totalTasksSubmitted = 6
poolSize = 2, corePoolSize = 2, queueSize = 5, queueRemainingCapacity = 2147483642, maximumPoolSize = 5, totalTasksSubmitted = 7
poolSize = 2, corePoolSize = 2, queueSize = 6, queueRemainingCapacity = 2147483641, maximumPoolSize = 5, totalTasksSubmitted = 8
poolSize = 2, corePoolSize = 2, queueSize = 7, queueRemainingCapacity = 2147483640, maximumPoolSize = 5, totalTasksSubmitted = 9
poolSize = 2, corePoolSize = 2, queueSize = 8, queueRemainingCapacity = 2147483639, maximumPoolSize = 5, totalTasksSubmitted = 10
--------------------

---- Direct hand-off queue instance = class java.util.concurrent.SynchronousQueue -------------
poolSize = 1, corePoolSize = 2, queueSize = 0, queueRemainingCapacity = 0, maximumPoolSize = 5, totalTasksSubmitted = 1
poolSize = 2, corePoolSize = 2, queueSize = 0, queueRemainingCapacity = 0, maximumPoolSize = 5, totalTasksSubmitted = 2
poolSize = 3, corePoolSize = 2, queueSize = 0, queueRemainingCapacity = 0, maximumPoolSize = 5, totalTasksSubmitted = 3
poolSize = 4, corePoolSize = 2, queueSize = 0, queueRemainingCapacity = 0, maximumPoolSize = 5, totalTasksSubmitted = 4
poolSize = 5, corePoolSize = 2, queueSize = 0, queueRemainingCapacity = 0, maximumPoolSize = 5, totalTasksSubmitted = 5
Task rejected = 6
poolSize = 5, corePoolSize = 2, queueSize = 0, queueRemainingCapacity = 0, maximumPoolSize = 5, totalTasksSubmitted = 6
Task rejected = 7
poolSize = 5, corePoolSize = 2, queueSize = 0, queueRemainingCapacity = 0, maximumPoolSize = 5, totalTasksSubmitted = 7
Task rejected = 8
poolSize = 5, corePoolSize = 2, queueSize = 0, queueRemainingCapacity = 0, maximumPoolSize = 5, totalTasksSubmitted = 8
Task rejected = 9
poolSize = 5, corePoolSize = 2, queueSize = 0, queueRemainingCapacity = 0, maximumPoolSize = 5, totalTasksSubmitted = 9
Task rejected = 10
poolSize = 5, corePoolSize = 2, queueSize = 0, queueRemainingCapacity = 0, maximumPoolSize = 5, totalTasksSubmitted = 10
--------------------


Process finished with exit code 0

控制器

public JsonResult Save（SAViewModel O）

                                       $.ajax({

                                        url: '/SA/Save',
                                        type: "POST",
                                        data: JSON.stringify(data),
                                        dataType: "JSON",
                                        contentType: "application/json",

                                        success: function (d) {
                                            //check is successfully save to database
                                            if (d.status == true) {
                                                //will send status from server side
                                                alert('Successfully done.');
                                                //clear form
                                                teaching = [];
                                                department = [];
                                                res = [];
                                                $('#schoolname').val('');
                                                $('#schooladdress').val('');
                                                $('#teaching').empty();
                                                $('#department').empty();
                                                $('#res').empty();
                                            }
                                            else {
                                                alert('Failed');
                                            }
                                            $('#submit').val('Save');
                                        },
                                        error: function () {
                                            alert('Error. Please try again.');
                                            $('#submit').val('Save');
                                        }
                                    });