erkantaylan / DotNet-WPF-XAML-Notes

My C# journey notes

C#/WPF/XAML-Notebook

My C# journey notes

XAML Enum with Description binding

https://github.com/erkantaylan/Enum-To-Combobox/blob/master/README.md

XAML Side

<ListBox ItemsSource="{Binding Source={extensions:EnumBindingSource {x:Type local:Status}}}" />

Sample enum ([TypeConverter(typeof(EnumDescriptionTypeConverter))] is must)

[TypeConverter(typeof(EnumDescriptionTypeConverter))]
public enum Status
{
    [Description("This is horrible")]
    Horrible,
    [Description("This is bad")]
    Bad,
    [Description("This is so so")]
    SoSo,
    [Description("This is good")]
    Good,
    [Description("This is better")]
    Better,
    [Description("This is best")]
    Best
}

MahappsMetro and Prism dialogs comes together to make life easier

MAhApps.Metro 1.6.5 and Prism.Unity v7.2.0.1233-pre

using System;
using System.Linq;
using System.Windows;
using System.Threading.Tasks;
using Prism.Mvvm;
using Prism.Services.Dialogs;
using MahApps.Metro.Controls.Dialogs;
using MahApps.Metro.Controls;

public static class DialogExtensions
{
    public static async Task<IDialogParameters> ShowDialogAsync(this CustomDialog dialog, MetroDialogSettings settings = null)
    {
        if (!(dialog.DataContext is DialogViewModel vm))
        {
            return null;
        }

        if (settings == null)
        {
            settings = MetroDialogSettingsFactory.Create();
        }

        MetroWindow window = Application.Current.Windows.OfType<MetroWindow>().First();
        await window.ShowMetroDialogAsync(dialog, settings);
        IDialogParameters parameters = await vm.Task;
        await window.HideMetroDialogAsync(dialog);
        return parameters;
    }
}

public abstract class DialogViewModel : BindableBase, IDialogViewModel
{
    private readonly TaskCompletionSource<IDialogParameters> tcs;

    protected DialogViewModel()
    {
        tcs = new TaskCompletionSource<IDialogParameters>();
    }

    public Task<IDialogParameters> Task => tcs.Task;

    public event EventHandler Closed;

    protected void Close(IDialogParameters parameters = null)
    {
        tcs.SetResult(parameters);
        Closed?.Invoke(this, EventArgs.Empty);
    }
}

public interface IDialogViewModel
{
    event EventHandler Closed;
}

public static class MetroDialogSettingsFactory
{
    public static MetroDialogSettings Create()
    {
        return new MetroDialogSettings
        {
            AnimateHide = true
          , AnimateShow = false
        };
    }
}

How to use it

ViewModel

class MyDialogViewModel : DialogViewModel {
  private void MyMethodtoEndDialog() { //submit or close does not matter
      this.Close(new DialogParameters(/*my parameters*/))
  }
}

Initialazing dialog

DialogParameters result = await container.Resolve<ServerConnectionDialog>().ShowDialogAsync();
if(result != null)
{
    //yeeey
}

yes it is one single line

you can just say Close() at viewmodel, it will return null as result and check if result is null

at dialogs i check only data is whether valid or not, i don't do any work with them, just return data to put all same logic in one place

Mahapps 2.0.0-alpha0316 app.xaml

<ResourceDictionary>
    <ResourceDictionary.MergedDictionaries>
        <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Controls.xaml" />
        <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Fonts.xaml" />
        <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/styles/flatbutton.xaml" />
        <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/styles/themes/dark.blue.xaml" />
    </ResourceDictionary.MergedDictionaries>
</ResourceDictionary>

Thread with timeout

TimedThread.cs

usage:

void MyLongRunningAction()
{
    Console.WriteLine("Before Sleep...");
    Thread.Sleep(1000);
    Console.WriteLine("After 1 Second Sleep...");
    Thread.Sleep(1000);
    Console.WriteLine("After 2 Second Sleep...");
    Thread.Sleep(1000);
    Console.WriteLine("After 3 Second Sleep...");
    Thread.Sleep(1000);
    Console.WriteLine("After 4 Second Sleep...");
    Thread.Sleep(1000);
    Console.WriteLine("After 5 Second Sleep...");
}

var timedThread = new TimedThread(myAction, 5000);
await timedThread.InvokeAsync();

if (status == ThreadStatus.DONE) {
    //thread worked properly
}
else {
    //thread canceled
}