如何在 C# 中反序列化多个 JSON 对象？

Posted 2023-02-22

【中文标题】如何在 C# 中反序列化多个 JSON 对象？

【英文标题】：How to deserialize multiple JSON objects in C#?

【发布时间】：2015-09-26 10:35:52

【问题描述】：

我将多个 JSON 对象从我的前端传递到 C# 后端 - 我如何将它们反序列化为 C# 类，以便以后可以在我的应用程序中使用它们？在我走得更远之前，我会使用 JS FormData 对象、contentType: false 和 processData: false，因为我还需要通过这个 AJAX 调用传递文件；这与这个问题完全无关。到目前为止，这是我的代码：

前端 - 按下提交按钮时调用函数

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);
        
    );

正在传递的 JSON.stringified 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; 

我已经完成了研究，发现了几个 *** 问题，这些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 对象序列化为一个List<Form>。我怎样才能做到这一点？我在发布的代码中做错了什么？

【参考方案1】：

[HttpPost]
public async Task<JsonResult> Test(List<Form> forms)

    // your code here

然后放上你的 JS 代码

formJson.push(tempJson);

里面

if (form)

【参考方案2】：

您正试图在此处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"]);

然后您应该能够以正常方式使用forms - 对其进行迭代、计数等。