Details

Written by: Stanko Milosev

Category: C#

Published: 11 October 2024

Last Updated: 19 November 2024

Hits: 1107

Now I will extend that example with DataGridView.

First lets create master DataTable:

private DataTable CreateMasterDataTable()
{
	DataTable dtMaster = new DataTable("Master");
	dtMaster.Columns.Add("Id", typeof(int));
	dtMaster.Columns.Add("SomeText", typeof(string));
	dtMaster.PrimaryKey =
	[
		dtMaster.Columns["Id"]
	];

	return dtMaster;
}

private DataTable CreateDetailDataTable()
{
	DataTable dtDetail = new DataTable("Detail");
	dtDetail.Columns.Add("Id", typeof(int));
	dtDetail.Columns.Add("MasterId", typeof(int));
	dtDetail.Columns.Add("SomeText", typeof(string));
	dtDetail.PrimaryKey =
	[
		dtDetail.Columns["Id"]
		, dtDetail.Columns["MasterId"]
	];

	return dtDetail;
}

DataSet dsMasterDetail = new DataSet("MasterDetail");
dsMasterDetail.Tables.Add(CreateMasterDataTable());
dsMasterDetail.Tables.Add(CreateDetailDataTable());

DataRelation relMasterDetail = new DataRelation("MasterDetailRelation"
	, dsMasterDetail.Tables["Master"].Columns["Id"]
	, dsMasterDetail.Tables["Detail"].Columns["MasterId"]
);

dsMasterDetail.Relations.Add(relMasterDetail);

var dsMasterDetail = CreateMasterDetailDataSet();
BindingSource bsMaster = new BindingSource
{
	DataSource = dsMasterDetail,
	DataMember = "Master"
};
dgvMaster.DataSource = bsMaster;

BindingSource bsDetail = new BindingSource
{
	DataSource = bsMaster,
	DataMember = "MasterDetailRelation"
};
dgvDetail.DataSource = bsDetail;

BindingSource bsDetail = new BindingSource
{
	DataSource = bsMaster,
	DataMember = "MasterDetailRelation"
};

Details

Written by: Stanko Milosev

Category: C#

Published: 20 May 2024

Last Updated: 20 May 2024

Hits: 1394

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: 5506

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);
}