在尝试在邮递员中混合文件上传和 json 数据后，我终于找到了一种可以在同一个请求中发送它们的方法.因此，我将我的 json 数据移动到 Postman 中的 Key 中，这样就可以使用 form-data 发送文件(下图).

After trying to mix a fileupload and json data in postman i finally found a method where it is possible to send them both in the same request. Therefore, I have moved my json data to a Key in Postman, so that it becomes possible to send files as well using form-data (Picture below).

在值内我有如下 JSON 数据:

Within the value I have JSON data as following:

{
   "WorkshopEmail":"workshopemail",
   "WorkshopContactperson":"workshopcontactperson",
   "WorkshopCellphone":"workshopcellphone",
   "Service":[
      {
         "service":"Claim Airbag",
         "RequestTypeId":"1",
         "DamageDate":"2021-05-03",
         "DamageKilometerreading":"213",
         "LatestServiceDate":"2021-05-03",
         "LatestServiceKilometer":"1223",
         "WorkshopDiagnos":"diagnos workshop",
         "CarOwnerDescription":"carownerdescription",
         "CategoryId":"25",
         "works":[
            {
               "title":"arbete 1 airbag",
               "chargePerHour":"11",
               "hours":"12",
               "price":"132.00",
               "id":"13926"
            },
            {
               "title":"arbete2 airbag",
               "chargePerHour":"1",
               "hours":"2",
               "price":"2.00",
               "id":"13927"
            },
            {
               "title":"part1 airbag",
               "pricePerUnit":"100",
               "quantity":"1",
               "price":"100.00",
               "id":"13928"
            },
            {
               "title":"part2 airbag",
               "pricePerUnit":"100",
               "quantity":"2",
               "price":"200.00",
               "id":"13929"
            }
         ]
      },
      {},
      {},
      {},
      {},
      {}
   ]
}

空的 {} 只包含更多的服务类型.现在，当我在 Postman 中发送请求时，我得到 200 OK，当我调试时，我可以看到以下内容(抱歉，如果图片模糊):

The empty {} just contains more service types. Now when I send the request in Postman i get a 200 OK and when i debug i can see the following (sorry if the picture is blurry):

¨但是，我的数据库没有使用这些值进行更新.下面是向表中插入数据的类:

¨ However, my database does not get updated with these values. Here's the class for inserting data into the tables:

public async Task<bool> AddRequest(Request model, List<IFormFile> file, [FromForm] string jsonData)
{
    bool CreateRequest = true;
    int requestID = 0;
    int claimID = 0;
    //bool country = true;

    //First Create the Request
    foreach (Service item in model.Service) 
    {
        //First Create the Request
        if (CreateRequest)
        {

            var parameters = new DynamicParameters();
            parameters.Add("WorkshopEmail", model.WorkshopEmail);
            parameters.Add("WorkshopContactperson", model.WorkshopContactperson);
            parameters.Add("WorkshopCellphone", model.WorkshopCellphone);
            parameters.Add("DamageDate", model.DamageDate);
            parameters.Add("LatestServiceDate", model.LatestServiceDate);
            parameters.Add("LatestServiceKilometer", model.LatestServiceKilometer);
            parameters.Add("DamageKilometerreading", model.DamageKilometerreading);
            parameters.Add("CurrentKilometerreading", model.CurrentKilometerreading);
            parameters.Add("CarOwnerDescription", model.CarOwnerDescription);
            parameters.Add("WorkshopDiagnos", model.WorkshopDiagnos);
            parameters.Add("AmountIncVat", model.AmountIncVat);



            try
            { 
            var requestIDenum = await _sqlconnection.QueryAsync<int>($@"INSERT INTO [dbo].[Request]
                                                    (WorkshopEmail,WorkshopContactperson,WorkshopCellphone,DamageDate,LatestServiceDate,
                                                     LatestServiceKilometer,DamageKilometerreading,CurrentKilometerreading,
                                                     CarOwnerDescription,WorkshopDiagnos,AmountIncVat)
                                                    VALUES
                                                    (@WorkshopEmail,@WorkshopContactperson,@WorkshopCellphone,@DamageDate,@LatestServiceDate,
                                                     @LatestServiceKilometer,@DamageKilometerreading,@CurrentKilometerreading,
                                                     @CarOwnerDescription,@WorkshopDiagnos,@AmountIncVat);SELECT SCOPE_IDENTITY();",parameters);
            requestID = requestIDenum.First();
            CreateRequest = false;

            }
            catch(Exception ex)
            {

                int hej = 0;
            }
        }
        
        if (item.fileuploadresults != null)
        {
            foreach (FileUploadResult f in item.fileuploadresults)
            {
                var parameters = new DynamicParameters();

                parameters.Add("file", f.filename);

                var filemessage = await _sqlconnection.QueryAsync<int>($@"INSERT INTO [dbo].[OptionalFile] ([FileName])
                                                  VALUES (@file); SELECT SCOPE_IDENTITY();", parameters);



                int FileMessageID = filemessage.First(); 

                
                await _sqlconnection.QueryAsync<int>($@"INSERT INTO[dbo].[ClaimCrossOptionalFile]
                                                    (ClaimID,FileID)
                                                    VALUES
                                                    ({claimID},{FileMessageID});");
            }
        }
              

    return true;
    //return list;
}      

控制器:

 [HttpPost]
        public async Task<IActionResult> AddRequest(List<IFormFile> file, [FromForm] string jsonData)
        {
            // if (!ModelState.IsValid)
            // {

            Request request = JsonConvert.DeserializeObject<Request>(jsonData); 

            try
            {
                //await _request.AddRequest(request);
            }
            catch (Exception ex)
            {

                return BadRequest(ex.Message);
            }

            return Ok(); 
        }

界面:

Task<bool> AddRequest(Request model, List<IFormFile> file, [FromForm] string jsonData);

旁注:这是代码的一部分，因为我试图保持简短，所以这里可能缺少一些 } 或某些东西，但没有问题.如果我应该添加整个代码，我也许可以通过链接或类似的方式发送它，因为在这里上传会很多.

Sidenote: This is part of the code, as i've tried to keep it short, so perhaps some } or something is missing here, but there's no problem. If i should add the whole code i could perhaps send it in a link or something similar, as it would be a lot to upload here.

但是，我现在不知道如何处理这个问题.我以前没有使用过表单数据，至少没有将 json 作为值传递.也许我在控制器中缺少/必须使用 json 数据做一些事情?我试过寻找解决方案，但我被困在这里.唯一的问题是数据库没有更新.

However, I do not now how to proceed with this issue at the moment. I've not worked with form-data much before, at least not with passing json as a value. Perhaps there's something I'm missing/have to do in the controller with the json data? I've tried looking for solutions but I've gotten stuck here. The only issue is that the database does not get updated.

更新，模型:

 public class Work
    {
        //base for claim
        public string title { get; set; } = "";
        public string chargePerHour { get; set; } = "";
        public string hours { get; set; } = "";
        public string price { get; set; } = "";
        public string id { get; set; } = "";
        public string pricePerUnit { get; set; } = "";
        public string quantity { get; set; } = "";

        //service
        public int rentreasonId { get; set; } = -1;
        public int rentservicecartypeId { get; set; } = -1;

        //tyres
        public int tireserviceId { get; set; } = -1;

        public IList<TireType> tireTypes { get; set; }
        public IList<Labour> labours { get; set; }
        
        public DateTime DateFrom{ get; set; } = DateTime.Parse("1753-01-01");
        public DateTime DateTo { get; set; } = DateTime.Parse("1753-01-01");

        //Insurance
        public string totalAmount { get; set; }
        public string requestInsuranceVatID { get; set; }
        public string vat { get; set; } = "0.0";
        public string totalExclVat { get; set; }="0.0";
        public string totalIncVat { get; set; }="0.0";


    }

    public class Labour
    {
        public string title { get; set; } = "";
        public string chargePerHour { get; set; } = "";
        public string hours { get; set; } = "";

        public string price { get; set; } = "";
    }

    public class TireType
    {
        public string quantity { get; set; } = "";
        public string brand { get; set; } = "";
        public string model { get; set; } = "";

        public string pricePerUnit { get; set; } = "";
        public string price { get; set; } = "";

        public string tireTypeId { get; set; } = "";

        public string widthID { get; set; } = ""; 

        public string heightID { get; set; } = "";

        public string diameterID { get; set; } = "";
    }

    public class Request
    {
        public string WorkshopEmail { get; set; } = "";

        public string WorkshopContactperson { get; set; } = "";

        public string WorkshopCellphone { get; set; } = "";

        public int AmountIncVat { get; set; } = 0;

        #region Claim
        public DateTime DamageDate { get; set; } = DateTime.Parse("1753-01-01");

        public DateTime LatestServiceDate { get; set; } = DateTime.Parse("1753-01-01");

        public int LatestServiceKilometer { get; set; } = 0;

        public int DamageKilometerreading { get; set; } = 0;

        public int CurrentKilometerreading { get; set; } = 0;

        public string CarOwnerDescription { get; set; } = "";

        public string WorkshopDiagnos { get; set; } = "";

        //public string OptionalMessage { get; set; } = "";

        #endregion
        public IList<Service> Service { get; set; }

       
    }

    public class TireTread
    {
        public string tireserviceId { get; set; } = "";
        public string leftfront { get; set; } = "";
        public string rightfront { get; set; } = "";
        public string leftrear { get; set; } = "";
        public string rightrear { get; set; } = "";
        public string added1 { get; set; } = "";
        public string added2 { get; set; } = "";
        public string added3 { get; set; } = "";
        public string added4 { get; set; } = "";
        public string added5 { get; set; } = "";
    }

    public class TireMessage
    {
        public int tireserviceId { get; set; }
        public string message { get; set; }
    }

    public class Service
    {
     //   [JsonProperty("ServiceId")]
        public string RequestTypeId { get; set; } = "";
        public string CategoryId { get; set; } = "-1";
     
  

        public string OptionalMessage { get; set; } = "";

        public IList<Work> works { get; set; }
        public IList<TireTread> treads { get; set; }

        public IList<TireMessage> TireMessages { get; set; }

        //filuppladdning
        public IList<FileUploadResult> fileuploadresults { get; set; }
    }

    //filuppladdning
    public class FileUploadResult
    {
        //public IFormFile files { get; set; } 

        public string filename { get; set; }
    }

推荐答案

我找到了解决方案，以防其他人遇到这个问题.我需要修改控制器并添加以下代码:

I found a solution, in case anyone else comes across this problem. I needed to modify the controller and add this code:

 [HttpPost]
        public async Task<IActionResult> AddRequest(List<IFormFile> file, [FromForm] string jsonData)
        {
            Request request = JsonConvert.DeserializeObject<Request>(jsonData);

            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }
            try
            {
                await _request.AddRequest(request, file, jsonData);

            }
            catch (Exception ex)
            {

                return BadRequest(ex.Message);
            }

            return Ok();
        }

基本上添加 request(我在方法的开头反序列化)，并在 await 请求中添加 file 和 jsonData，解决了问题.至于文件上传，我也需要修改该方法，将文件名放入数据库:

Basically adding request (that I deserialize in the begining of the method), and adding the file, and jsonData in an await request, solved the problem. As for the fileuploading, I needed to modify that method as well, to get the filename into the database:

if (file != null)
                {

                    foreach (IFormFile f in file)
                    {
                        string filename = Path.GetFileName(f.FileName);
                        var parameters = new DynamicParameters();
                        parameters.Add("file", filename);

                        var filemessage = await _sqlconnection.QueryAsync<int>($@"INSERT INTO 
                        [dbo].[OptionalFile] ([FileName])
                        VALUES (@file); SELECT SCOPE_IDENTITY();", parameters);
    
                    }
                
                } 

将这些更改为可以在同一请求中发送包含 json 键值和多个文件的请求.

Changing these to made it possible to send a request containg both the json key value, and multiple files, in the same request.