Details

Written by: Stanko Milosev

Category: C#

Published: 20 May 2024

Last Updated: 20 May 2024

Hits: 440

First I have started new WinForms with .NET 8.0 support, and installed nuGet package CommunityToolkit.Mvvm, then I have added new button, and the class SimpleCommandViewModel which inherits INotifyPropertyChanged:

public class SimpleCommandViewModel: INotifyPropertyChanged
{
    public event PropertyChangedEventHandler? PropertyChanged;

    protected void OnPropertyChanged([CallerMemberName] string propertyName = "")
        => PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));

    private RelayCommand _sampleCommand;

    public SimpleCommandViewModel()
    {
        _sampleCommand = new RelayCommand(ExecuteSampleCommand);
    }

    public void ExecuteSampleCommand()
        => MessageBox.Show("Hello world");

    public RelayCommand SampleCommand
    {
        get => _sampleCommand;
        set
        {
            if (_sampleCommand == value)
            {
                return;
            }

            _sampleCommand = value;
            OnPropertyChanged();
        }
    }
}

new RelayCommand(ExecuteSampleCommand);

new RelayCommand(ExecuteSampleCommand, CanExecuteSampleCommand);

Now, build it at least once.

Then in Properties -> DataBindings -> Command -> add new Object DataSource -> choose SimpleCommandViewModel, after choose SampleCommand from dropdown list. In Form Load event add code:

private void Form1_Load(object sender, EventArgs e)
{
	simpleCommandViewModelBindingSource.DataSource = new SimpleCommandViewModel();
}

Details

Written by: Stanko Milosev

Category: C#

Published: 14 March 2024

Last Updated: 14 March 2024

Hits: 4524

According to https://stackoverflow.com/a/14413414

Natively WebAPI doesn't support binding of multiple POST parameters. 

Here I already gave two examples of WebAPI with multiple Post parameters. Now I will use similiar approach to send image plus additional data, like file and folder name.

First don't forget in Program.cs to add Service:

builder.Services.AddMvc().AddNewtonsoftJson();

Controller:

using Microsoft.AspNetCore.Mvc;
using Newtonsoft.Json.Linq;

namespace UploadImageServer.Controllers;

public class UploadImageController : Controller
{
    [HttpPost]
    [Route("UploadImage")]

    public async Task<IActionResult> UploadImage([FromBody] JObject? data)
    {
        if (data is null) return BadRequest(new { message = "No image." });
        string? base64Image = data["image"]?.ToString();

        if (base64Image == null) return BadRequest(new { message = "No image." });
        byte[] imageBytes = Convert.FromBase64String(base64Image);

        Directory.CreateDirectory(data["folderName"]?.ToString() ?? string.Empty);

        string imagePath = $"{data["folderName"]}\\{data["fileName"]}";
        await System.IO.File.WriteAllBytesAsync(imagePath, imageBytes);

        return Ok(new { message = "Image uploaded successfully." });
    }
}

---

Client:

using Newtonsoft.Json.Linq;
using System.Net.Http.Headers;

string imageUrl = "spring.jpg";
string base64Image = ConvertImageToBase64(imageUrl);
var jsonData = new JObject
{
    ["image"] = base64Image
    , ["fileName"] = "magnolia.jpg"
    , ["folderName"] = "spring"
};
string jsonContent = jsonData.ToString();

using HttpClient client = new HttpClient();
StringContent content = new StringContent(jsonContent);
content.Headers.ContentType = new MediaTypeHeaderValue("application/json");

HttpResponseMessage response = await client.PostAsync("https://localhost:7028/UploadImage", content);

if (response.IsSuccessStatusCode)
{
    Console.WriteLine("Image uploaded successfully!");
}
else
{
    Console.WriteLine("Failed to upload image. Status code: " + response.StatusCode);
}

static string ConvertImageToBase64(string imagePath)
{
    byte[] imageBytes = File.ReadAllBytes(imagePath);
    return Convert.ToBase64String(imageBytes);
}

Details

Written by: Stanko Milosev

Category: C#

Published: 24 December 2023

Last Updated: 25 December 2023

Hits: 757

For this example I have added following NuGet packages:

FluentFTP

FluentFTP.Logging

log4net

Microsoft.Extensions.Configuration.Json - this package I needed because user name and pass for FTP I have saved in JSON configuration file.

In short code looks like this:

Log4NetLogger log4NetLogger = new Log4NetLogger(log);
AsyncFtpClient client = new AsyncFtpClient(host, user, pass);
client.ValidateCertificate += OnValidateCertificate;
client.Logger = new FtpLogAdapter(log4NetLogger);
await client.AutoConnect();
await client.UploadFile(fileName, "/public_html/kmlTestDelete/test.kml");

private void OnValidateCertificate(BaseFtpClient control, FtpSslValidationEventArgs e)
{
	e.Accept = true;
}

Class Log4NetLogger looks like this:

using log4net;
using Microsoft.Extensions.Logging;
using ILogger = Microsoft.Extensions.Logging.ILogger;

namespace FluentFTPasyncExample;

public class Log4NetLogger : ILogger
{
    private readonly ILog _log;

    public Log4NetLogger(ILog log)
    {
        _log = log;
    }

    public void Log<TState>(LogLevel logLevel, EventId eventId, TState state, Exception exception, Func<TState, Exception, string> formatter)
    {
        string message = $"{formatter(state, exception)} {exception}";
        if (!string.IsNullOrEmpty(message))
        {
            switch (logLevel)
            {
                case LogLevel.Critical:
                    _log.Fatal(message);
                    break;
                case LogLevel.Debug:
                case LogLevel.Trace:
                    _log.Debug(message);
                    break;
                case LogLevel.Error:
                    _log.Error(message);
                    break;
                case LogLevel.Information:
                    _log.Info(message);
                    break;
                case LogLevel.Warning:
                    _log.Warn(message);
                    break;
                default:
                    _log.Warn($"Encountered unknown log level {logLevel}, writing out as Info.");
                    _log.Info(message, exception);
                    break;
            }
        }
    }

    public bool IsEnabled(LogLevel logLevel)
    {
        switch (logLevel)
        {
            case LogLevel.Critical:
                return _log.IsFatalEnabled;
            case LogLevel.Debug:
            case LogLevel.Trace:
                return _log.IsDebugEnabled;
            case LogLevel.Error:
                return _log.IsErrorEnabled;
            case LogLevel.Information:
                return _log.IsInfoEnabled;
            case LogLevel.Warning:
                return _log.IsWarnEnabled;
            default:
                throw new ArgumentOutOfRangeException(nameof(logLevel));
        }
    }

    public IDisposable BeginScope<TState>(TState state)
    {
        return null!;
    }

}

Example download from here.