"Validation failed for one or more entities. ERROR - api

Question

I am creating web API to save the uploaded file in my local storage. When I testing my code it gives an error as ExceptionMessage": "Validation failed for one or more entities. See EntityValidationErrors' property for more details."
Can anyone help to fix this issue. Thanks in advance.
Controller(FileUploadController)
using System;
using System.Net.Http;
using System.Threading.Tasks;
using System.IO;
using System.Collections.Generic;
using System.Web.Http;
using VantageCore.BL;
namespace VantageCoreApi.Controllers.Api
{
public class FileUploadController : ApiController
{
[HttpPost]
[Route("api/FileUpload")]
public async Task<IHttpActionResult> UploadFile(string FileName, int Id)
{
try
{
List<string> ids = new List<string>();
var provider = new MultipartMemoryStreamProvider();
await Request.Content.ReadAsMultipartAsync(provider);
var referenceId = FileName.Split('_')[0];
foreach (var file in provider.Contents)
{
Guid guid;
ids.Add(Guid.TryParse(await new FileUploadMgt().ReceiveFile(file, FileName, Id), out guid) ? FileName : "Error");
}
return Ok(ids);
}
catch (Exception e)
{
return InternalServerError(e);
}
}
public string SaveFile(byte[] File, string path)
{
string Result = "";
try
{
//LOCAL SERVER PATH
var fs = new BinaryWriter(new FileStream(#"F:\Testfolder" + path, FileMode.Append, FileAccess.Write));
fs.Write(File);
fs.Close();
Result = path;
}
catch (Exception ee)
{
Result = ee.ToString();
}
return Result;
}
}
}
BL (FileUplodMgt.cs)
using System;
using System.Threading.Tasks;
using System.Collections.Specialized;
using System.Configuration;
using System.IO;
using System.Net.Http;
using VantageCore.Entity.Model;
using File = VantageCore.Entity.Model.File;
namespace VantageCore.BL
{
public class FileUploadMgt
{
public async Task<string> ReceiveFile(HttpContent receivedFile, string receivedFileName, int Id)
{
if (receivedFile != null)
{
var fileId = Guid.NewGuid();
using (var c = new DBEntities())
{
NameValueCollection appSettings = ConfigurationManager.AppSettings;
string folder = appSettings["TestPath"];
var fileName = fileId.ToString() + Path.GetExtension(receivedFileName).ToLower();
var file = Path.Combine(folder, fileName);
bool exists = Directory.Exists(folder);
if (!exists) Directory.CreateDirectory(folder);
using (var fs = new BinaryWriter(new FileStream(file, FileMode.Create, FileAccess.Write)))
{
fs.Write(await receivedFile.ReadAsByteArrayAsync());
}
string extention = Path.GetExtension(file);
receivedFileName = Path.GetFileNameWithoutExtension(receivedFileName).Length <= 32
? Path.GetFileNameWithoutExtension(receivedFileName)
: Path.GetFileNameWithoutExtension(receivedFileName).Substring(0, 31) + "~";
var newFile = new File
{
Uid = fileId,
FileExtention = extention,
FileName = receivedFileName,
FileSize = (int)(receivedFile.Headers.ContentLength / 1024),
CreatedDate = DateTime.UtcNow
};
c.Files.Add(newFile);
c.SaveChanges();
}
return fileId.ToString();
}
else
{
return "Error,Invalid file Or file size exceeded";
}
}
}
}

Answer 1

You could try as below to observe the error message when you debug and share it；
try
{
c.SaveChanges();
}
catch (DbEntityValidationException e)
{
foreach (var eve in e.EntityValidationErrors)
{
}
}