Activities of "fguo"

Great! It does the trick! Thank you very much!!!

Yes. I tried that, but if I removed that code, it goes back without detail message to Client side. I still only get the general message "An internal error occurred during request".

This is what I am looking for! I want to return the "500 - internal error" to client during development/staging, because not all developers has right to access host server to get the log file.

I followed ismcagdas' example to set "SendAllExceptionsToClients = true;" in SNetWebHostModule. It works, but I get the whole stacks message which is hard to read. I want to filter out some key words and convert to a brief, easy to understand message. So, I tried following suggestion of aaron and alper by adding a class into *Web.Host/Startup, but there is no different. I still get the whole stacks messages. Here is my code:

namespace *.Web.Startup
{
    public class ExceptionFilter : IExceptionFilter, IExceptionToErrorInfoConverter, ITransientDependency
    {
        public IExceptionToErrorInfoConverter Next { set => throw new NotImplementedException(); }

        public ErrorInfo Convert(Exception exception)
        {
            return new ErrorInfo(exception.Message.Substring(0, 20));
        }

        public void OnException(ExceptionContext context)
        {
            if (context.Exception is UserFriendlyException)
            {
                return;
            }

            context.Exception = new UserFriendlyException("We could not service your request at this stage, please try again later", context.Exception);
        }
    }
}

public IServiceProvider ConfigureServices(IServiceCollection services)
        {
            //MVC
            services.AddMvc(options =>
            {
                options.Filters.Add(new CorsAuthorizationFilterFactory(DefaultCorsPolicyName));
                options.Filters.AddService(typeof(ExceptionFilter));
            });

What did I miss?

Thanks,

Solved. I wrongly understand the "FileToken". It is used as an encrypted file name, instead of a directory.

Just change the code:

if (!Directory.Exists(filePath))
                Directory.CreateDirectory(filePath);
            File.Copy(fileSource, Path.Combine(filePath, fileName));

as

File.Copy(fileSource, filePath);

It solved my issue.

Now, my next questions:

1. How do I upload files from Angular into server?
2. Is it possible to embed a file (e.g. a picture) into json object? For example, API returns like { "id": 123, "picture": {/* a jpg file */} }

Thanks,

I figured out my first question, but not 100%. Here is my tests:

I like to keep as simple as possible at my first test. I created a method in FileController:

public ActionResult DownloadTestFile()
        {
            var filePath = @"C:\x.xlsx";
            if (!System.IO.File.Exists(filePath))
            {
                throw new UserFriendlyException(L("RequestedFileDoesNotExists"));
            }

            var fileBytes = System.IO.File.ReadAllBytes(filePath);
            return File(fileBytes, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"); 
        }

It works fineas I use a browser and url: <a class="postlink" href="http://localhost:22742/File/DownloadTestFile">http://localhost:22742/File/DownloadTestFile</a>.

Now, I want to add a fileToken on it. I created a service:

public class FileAppService : *AppServiceBase, IImageAppService
    {
        private readonly IAppFolders _appFolders;

        public FileAppService(IAppFolders appFolders)
        {
            _appFolders = appFolders;
        }

        public FileDto GetFile()
        {
            var fileSource = @"C:\x.xlsx";
            var fileName = "example.xlsx";
            var file = new FileDto(fileName, MimeTypeNames.ApplicationVndOpenxmlformatsOfficedocumentSpreadsheetmlSheet);
            var filePath = Path.Combine(_appFolders.TempFileDownloadFolder, file.FileToken);
            if (!Directory.Exists(filePath))
                Directory.CreateDirectory(filePath);
            File.Copy(fileSource, Path.Combine(filePath, fileName));

            return file;
        }
    }

This service works fine. When I test it on swager, it give out a FileDto:

"result": {
    "fileName": "example.xlsx",
    "fileType": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
    "fileToken": "9a864412394442758089b4256029cd48"
  }

I confirmed It copies the file on C:\aspnet-core\src\SNet.Web.Host\wwwroot\Temp\Downloads\9a864412394442758089b4256029cd48\example.xlsx

However, when I try to download the file by url: <a class="postlink" href="http://localhost:22742/File/DownloadTempFile?fileType=application/vnd.openxmlformats-officedocument.spreadsheetml.sheet&fileToken=9a864412394442758089b4256029cd48&fileName=example.xlsx">http://localhost:22742/File/DownloadTem ... ample.xlsx</a>,I get exception on code:

throw new UserFriendlyException(L("RequestedFileDoesNotExists"));

What did I miss? Does the "_appFolders.TempFileDownloadFolder" in FileController point to a different location?

Thanks,

Sorry, still don't understand. My need is simple: I have a file "x.jpg" stored in server folder "C:/Files/". How do I code something to let user download it to client side? Can you show me an code example?

I also need to deal other use-cases about files soon, such as embedding a file (e.g. a picture) into json object, and uploading files into server. I wonder if AspNetZero have built-in functions or easy-to-follow instructions about file handling. If not, it is understandable. I may stop digging it in AspNetZero and try other alternatives for handling files. Can you clarify this?

Thank you!

@drenton Thank you for your clue.

I found the class of "FileDownloadService" and "FileController", and studied some examples (e.g. getUsersToExcel). It seems to convert a file into a FileDto and return this FileDto as JSON format {"fileName", "fileType", "fileToken"}, but I still couldn't understand how to convert a file content to "fileToken" in server side and how to convert back the FileDto to original file and save it on client side.

Is there any instruction/tutorial/example about it? Let's say, I have a file example.jpg stored in folder App_Data. How do I build a service on both of Core and Angular sides?

Thanks,

I am using Core + Angular version, and need to return a file (.jpg, .xlsx, .pdf, and so on) to client site. It seems that our API can ONLY return a JSON object, as I know. Is it possible to return a file?

Thanks,

I am using Core+Angular version 5.0.4. Usually, there is no App_Data folder in published files, but when I deployed the published files into IIS and after the first run, the App_Data folder will be created on root and contains Log.txt file.

Recently, the App_Data folder never show up after deployed on IIS. I can run the program, but can't find/trace the Log.txt file.

What do I possibly miss?

Thanks,

The above aaron's code works fine in my methods. Now I have multiple methods (createObj, updateObj, GetObj, and so on) which need the same username, so I moved the same code into the service class constructor. The "GetCurrentUser().UserName;" always throw out exception: Invalid object name 'AbpUsers'.

What do I miss?

Thanks,