[英]C# getting 500 error from server when uploading multipartform with image to API
So I have a management application where a user can add a product to the database through the API.所以我有一个管理应用程序,用户可以通过 API 将产品添加到数据库中。 The functions in the API work fine because I have tested this with postman.
API 中的函数工作正常,因为我已经用邮递员测试过了。 However, I am probably uploading it incorrectly to the Web API, and I don't know why.
但是,我可能错误地将其上传到 Web API,我不知道为什么。
The Web API is an ASP.NET CORE Web API. Web API 是一个 ASP.NET CORE Web API。 Ans my management is a Windows Forms application, yes I know it's not the best choice.
Ans 我的管理是 Windows 窗体应用程序,是的,我知道这不是最佳选择。 But anyways here is how I try to upload the form to the Web API from the application:
但无论如何,这是我尝试将表单从应用程序上传到 Web API 的方法:
The upload action of the form:表单的上传动作:
private void buttonToevoegen_Click(object sender, EventArgs e)
{
if (textArtikelNaam.Text == "")
{
MessageBox.Show("Artikelnaam is leeg, voeg text toe", "Error", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
else if (textArtikelOmschrijving.Text == "")
{
MessageBox.Show("Artikel omschrijving is leeg, voeg text toe", "Error", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
else if (textArtikelPrijs.Text == "")
{
MessageBox.Show("Artikel prijs, voeg text toe", "Error", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
else if (comboBoxType.Text == "")
{
MessageBox.Show("Selecteer type", "Error", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
else if (buttonSelecteerAfbeelding.Text == "")//werkt nog niet
{
MessageBox.Show("Selecteer afbeelding", "Error", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
else
{
ToevoegProduct product = new ToevoegProduct();
product.ProductNaam = textArtikelNaam.Text;
product.ProductPrijs = Convert.ToInt32(textArtikelPrijs.Text);
product.ProductBeschrijving = textArtikelOmschrijving.Text;
product.ProductType = comboBoxType.Text;
product.ProductAfbeelding = imageArtikel.Image;
product.ProductWinkel = 1;
product.ProductDirectLeverbaar = false; //niet nodig.
product.ProductKorting = 0;
product.ProductVoorraad = 1;
API.postProductMulti("products", product, "toevoegen");
MessageBox.Show("Product is correct toegevoegd!", "Gelukt!", MessageBoxButtons.OK, MessageBoxIcon.Information);
ProductenOverzicht f7 = new ProductenOverzicht();
Hide();
f7.Show();
}
the API class function: API类函数:
public static async void postProductMulti(string model, Models.ToevoegProduct product, string optionalRoute = null)
{
HttpClient client = new HttpClient();
MultipartFormDataContent mfdc = new MultipartFormDataContent();
// create the communication to the model from the API.
string apiposturl = apiurl;
apiposturl += model;
if (optionalRoute != null)
apiposturl += ("/" + optionalRoute);
byte[] bytes;
using (var ms = new MemoryStream())
{
product.ProductAfbeelding.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
bytes = ms.ToArray();
}
mfdc.Add(new StringContent(product.ProductNaam), "productNaam");
mfdc.Add(new StringContent(product.ProductPrijs.ToString()), "productPrijs");
mfdc.Add(new StringContent(product.ProductBeschrijving), "productBeschrijving");
mfdc.Add(new StringContent(product.ProductType), "productType");
mfdc.Add(new StringContent(product.ProductKorting.ToString()), "productKorting");
mfdc.Add(new StringContent(product.ProductVoorraad.ToString()), "productVoorraad");
mfdc.Add(new StringContent(product.ProductDirectLeverbaar.ToString()), "productDirectLeverbaar");
mfdc.Add(new ByteArrayContent(bytes, 0, bytes.Length), "productAfbeelding");
HttpResponseMessage response = await client.PostAsync(apiposturl, mfdc);
response.EnsureSuccessStatusCode();
client.Dispose();
string sd = response.Content.ReadAsStringAsync().Result;
}
And this is my ToevoegProduct model:这是我的 ToevoegProduct 模型:
namespace FlowerPower.Models
{
class ToevoegProduct
{
public int Id { get; set; }
public string ProductNaam { get; set; }
public int ProductPrijs { get; set; }
public string ProductBeschrijving { get; set; }
public string ProductType { get; set; }
public int ProductKorting { get; set; }
public int ProductVoorraad { get; set; }
public bool ProductDirectLeverbaar { get; set; }
public Image ProductAfbeelding { get; set; }
public int ProductWinkel { get; set; }
}
}
And my this is what my API will be doing when this action is requested:这就是我的 API 在请求此操作时将执行的操作:
The add action in the product controller:产品控制器中的添加操作:
[HttpPost("toevoegen")]
[EnableCors("AllowAnyOrigin")]
public async Task<IActionResult> PostProduct([FromForm] AddedProduct product)
{
// Kijk of het huidige model geldig is.
// Zo niet dan wordt een een BadRequest code weergegeven.
if (!ModelState.IsValid)
{
return BadRequest(ModelState);
}
// Upload de meegegeven afbeelding naar de website en database.
FileUploader.UploadFile(product.ProductAfbeelding);
// Voeg het product toe aan de database.
_context.Product.Add(ConvertAddedToProduct(product, FileUploader.UploadedUrl)[0]);
await _context.SaveChangesAsync();
// Ga naar GetProduct, dit stuurt het aangemaakte product terug.
return CreatedAtAction("GetProduct", new { id = product.Id }, product);
}
And this is the addedproduct model in my API.这是我的 API 中添加的产品模型。
public class AddedProduct
{
public int Id { get; set; }
public string ProductNaam { get; set; }
public int ProductPrijs { get; set; }
public string ProductBeschrijving { get; set; }
public string ProductType { get; set; }
public int ProductKorting { get; set; }
public int ProductVoorraad { get; set; }
public bool ProductDirectLeverbaar { get; set; }
public IFormFile ProductAfbeelding { get; set; }
public int ProductWinkel { get; set; }
}
I also don't want to change up my API because I know that it works and that it's possible.我也不想更改我的 API,因为我知道它可以工作并且是可能的。
As requested my postman:按照我的邮递员的要求:
And this is the exception:这是例外:
System.Net.Http.HttpRequestException occurred HResult=0x80131500 Message=Response status code does not indicate success: 500 (Internal Server Error).
System.Net.Http.HttpRequestException 发生 HResult=0x80131500 Message=响应状态代码未指示成功:500(内部服务器错误)。 Source= StackTrace: at System.Net.Http.HttpResponseMessage.EnsureSuccessStatusCode() at FlowerPower.API.d__3.MoveNext() in C:\\Users\\beren\\Source\\Repos\\FlowerPowerAPI\\FlowerPower1\\API.cs:line 133
Source= StackTrace:在 System.Net.Http.HttpResponseMessage.EnsureSuccessStatusCode() 在 FlowerPower.API.d__3.MoveNext() 在 C:\\Users\\beren\\Source\\Repos\\FlowerPowerAPI\\FlowerPower1\\API.cs:line 133
I fixed this issue with another solution.我用另一个解决方案解决了这个问题。 I used RestSharper, because that is what postman uses for C#.
我使用了 RestSharper,因为这是 postman 用于 C# 的。 With the use of RestSharper came a couple of changes.
随着 RestSharper 的使用,带来了一些变化。 I had to change the post function in my API class and the way how I was filling my model.
我不得不更改 API 类中的 post 函数以及填充模型的方式。
This is how I'm filling my model now:这就是我现在填充模型的方式:
else
{
ToevoegProduct product = new ToevoegProduct();
product.ProductNaam = textArtikelNaam.Text;
product.ProductPrijs = Convert.ToInt32(textArtikelPrijs.Text);
product.ProductBeschrijving = textArtikelOmschrijving.Text;
product.ProductType = comboBoxType.Text;
product.ProductAfbeelding = imageArtikel.ImageLocation;
product.ProductWinkel = 1;
product.ProductDirectLeverbaar = false; //niet nodig.
product.ProductKorting = 0;
product.ProductVoorraad = 1;
API.postProductMulti("products", product, "toevoegen");
MessageBox.Show("Product is correct toegevoegd!", "Gelukt!", MessageBoxButtons.OK, MessageBoxIcon.Information);
ProductenOverzicht f7 = new ProductenOverzicht();
Hide();
f7.Show();
}
and this is the post method in the API class of the client:这是客户端 API 类中的 post 方法:
public static void postProductMulti(string model, Models.ToevoegProduct product, string optionalRoute = null)
{
//HttpClient client = new HttpClient();
MultipartFormDataContent mfdc = new MultipartFormDataContent();
// create the communication to the model from the API.
string apiposturl = apiurl;
apiposturl += model;
if (optionalRoute != null)
apiposturl += ("/" + optionalRoute);
var client = new RestClient(apiposturl);
var request = new RestRequest(Method.POST);
// Zet de headers voor de request.
// Dit is bij alles hetzelfde met een multipart/form-data requeset.
request.AddHeader("postman-token", "293a9ff3-e250-e688-e20d-5d16ea635597");
request.AddHeader("cache-control", "no-cache");
request.AddHeader("content-type", "multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW");
request.AddHeader("Content-Type", "multipart/form-data");
// Vul de parameters met de waardes van heet model.
request.AddParameter("productNaam", product.ProductNaam);
request.AddParameter("productBeschrijving", product.ProductBeschrijving);
request.AddParameter("productType", product.ProductType);
request.AddParameter("productKorting", product.ProductKorting);
request.AddParameter("productVoorraad", product.ProductVoorraad);
request.AddParameter("productDirectLeverbaar", product.ProductDirectLeverbaar);
request.AddFile("productAfbeelding", product.ProductAfbeelding); // Voeg hier het bestandspad in.
request.AddParameter("productWinkel", product.ProductWinkel);
// Verstuur de request.
IRestResponse response = client.Execute(request);
}
This solved my problem.这解决了我的问题。
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