如何在C#中反序列化多个JSON对象？

Question

我将从前端向C#后端传递多个JSON对象- 如何将它们反序列化为C#类，以便稍后在应用程序中使用？ 在继续之前，我必须使用JS FormData对象，contentType: false和processData: false，因为我还需要通过此AJAX调用传递文件；这与本问题完全无关。以下是我的代码： 前端 - 当提交按钮被按下时调用函数

submitData: function () {
    var formCollection = this.appModel.get('formCollection').models;
    var formData = new FormData();
    var formJson = [];
    $.each(formCollection, function (index, form) {
        var tempJson = {};
        if (form) {
            tempJson['id'] = form.get('id');
            tempJson['number'] = form.get('number');
            tempJson['name'] = form.get('name');
            tempJson['attachments'] = form.get('attachments');
            formJson.push(tempJson);
        }
    });
    console.log(JSON.stringify(formJson));
    formData.append('formJson', JSON.stringify(formJson));
    $.ajax({
        type: "POST",
        url: '/NMISProduct/Test',
        contentType: false,
        processData: false,
        data: formData,
        success: function (result) {
            console.log(result);
        }
    });
}

被传递的JSON字符串化数据

[{"id":1,"number":null,"name":"Investment Portfolio Statement","attachments":null},{"id":2,"number":"61-0227","name":"WMC Signature Portfolio Agreement","attachments":null},{"id":3,"number":"61-1126","name":"WMC Signature Choice Agreement","attachments":null},{"id":4,"number":"61-1162","name":"WMC Signature Annuities Agreement","attachments":null},{"id":5,"number":"61-1205","name":"WMC Signature Managed Accounts Client Agreement","attachments":null}]

C# MVC 5 后端

[HttpPost]
public async Task<JsonResult> Test()
{
    Debug.WriteLine(Request.Params["formJson"]);
    var forms = JsonConvert.DeserializeObject<Form>(Request.Params["formJson"]);
    Debug.WriteLine(forms);
    try
    {
        var srNumber = GetSRNumber();
        foreach (string file in Request.Files)
        {
            var fileContent = Request.Files[file];
            Debug.WriteLine(ReadFileInputStream(fileContent));
            if (fileContent != null && fileContent.ContentLength > 0)
            {
                // get a stream
                var stream = fileContent.InputStream;
                // and optionally write the file to disk
                //var fileName = Path.GetFileName(file);
                var fileName = fileContent.FileName;
                var path = Path.Combine(Server.MapPath("~/App_Data/"), fileName);
                using (var fileStream = System.IO.File.Create(path))
                {
                    stream.CopyTo(fileStream);
                }
            }
        }
    }
    catch (Exception)
    {
        return Json("Upload failed");
    }
    return Json("File uploaded successfully");
}

public class Form
{
    public int id { get; set; }
    public string number { get; set; }
    public string name { get; set; }
    public Form attachments { get; set; }
    public byte[] fileAsBytes { get; set; }
}

我已经做过研究，发现了一些 Stackoverflow 的问题，展示了如何将一个 JSON 对象序列化为一个 C# 类 - 但是，我需要将多个 JSON 对象序列化为 List<Form>。我该怎么做？在发布的代码中我做错了什么？

- kibowki

Answer 1

您正在尝试将其反序列化为单个表单：

var forms = JsonConvert.DeserializeObject<Form>(Request.Params["formJson"]);

只需将其更改为：

var forms = JsonConvert.DeserializeObject<List<Form>>(Request.Params["formJson"]);

然后你应该能够以普通的方式使用 forms - 迭代、计数等。

- Jon Skeet

Answer 2

[HttpPost]
public async Task<JsonResult> Test(List<Form> forms)
{
    // your code here
}

把你的JS代码放在这里。

formJson.push(tempJson);

在里面

if (form)

- yannick