将文件数组从 Jquery ajax 发送到控制器操作

Question

我能够将单个文件作为 System.Web.HttpPostedFileBase 传递，但是当我传递与文件数组相同的文件时，我在控制器的操作中得到空值。

我已尝试发送文件数组。

HTML：

        <input type="file" id="Attachment1">
        <input type="file" id="Attachment2">
        <input type="file" id="Attachment3">
        <input type="file" id="Attachment4">
        <input type="file" id="Attachment5">

Javascript：

 var FileData = []; 
 $('input').each(function () {
                var type = $(this).attr("type");
                if (type == "file") {
                    FileData.push($(this).get(0).files[0]);
                }
            });    
var Data = new FormData();
Data.append("Attachments", FileData);         
if (url != '') {
    $.ajax({
        url: url,
        data: Data,
        type: "POST",
        contentType: false,
        processData: false,
        success: function (data) {
            alert("Saved successfully");
        }
    });
}

控制器：

public ActionResult InsertDetails(System.Web.HttpPostedFileBase[] Attachments)
{
   return Json(new { Success = false });
}

需要获取文件数组。提前致谢。

Answer 1

感谢你们的努力。我找到了解决方案。我只需要保留相同键“附件”的附加文件。现在我可以得到 HttpPostedFileBase 的数组。

 var Data = new FormData();
 $('input').each(function () {
                var type = $(this).attr("type");
                if (type == "file") {
                    var FileData = $(this).get(0).files[0]);
                    Data.append("Attachments", FileData); 
                }
            });    

Answer 2

试试看：

    var Files = new FormData();    

         $('input').each(function () {
         var type = $(this).attr("type");
          if (type == "file") {
Files .append("Attachment"+$(this).attr("id"), $(this).get(0).files[0]);   
                        }
                    });    

        if (url != '') {
            $.ajax({
                url: url,
                data: Files ,
                type: "POST",
                contentType: false,
                processData: false,
                success: function (data) {
                    alert("Saved successfully");
                }
            });
        }

Answer 3

这就是我过去将数组数据从 javascript 发布到 mvc 控制器 的方式，这会有点冗长，但我已经用注释解释了每一行，希望对你有帮助

javascript:

var formData = new FormData(); //declare formData
var arrayData = []; //declare array and push/append your data to it.

var name="abc";
arrayData.push(name);

//setting ArrayData to Json Object
var AllData = {
            getUserData: arrayData
        };

//appending Json Object to formdata with the key "mydata"
formData.append("mydata", JSON.stringify(AllData));

//sending formdata through ajax request
$.ajax({
      type: "POST",
      url: yourURLHere,
      processData: false,
      contentType: false,
      data: formData,
      cache: false,
      success: function (data) {
            //your program logic here
      }
});

控制器：

public async Task<HttpResponseMessage> SaveResponse()
{

//receiving json data from the key "mydata" we set earlier 
var getData = HttpContext.Current.Request.Params["mydata"];

//deserialize json object (you will need Newtonsoft.Json library)
var model = JsonConvert.DeserializeObject<MyModel>(getData);

//you will get all of your data in model variable
//do what you want to do with that data

}

这是模型类

public class MyModel
{
   //**dataList** will receive array data sent from javascript  
   public List<MyModel> dataList = new List<MyModel>();

   //Remember, whatever your push to array in javascript, should be declared here.
   public string name {get;set;}   

}