C# WPF Access from ViewModel to MainWindow

Question

Hello,
I have this.

 public class ViewModel : INotifyPropertyChanged
    {

The goal is to get access from ViewModel to MainWindow. So I can change the color and so one.

public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();



            //DataContext.
            //((ViewModel)DataContext).SetLogger(Log);
            this.txtGebindeSlot1.Background = Brushes.Red;
        }

 private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
        {

Answer 1

namespace Station  
{  
    [ValueConversion(typeof(string), typeof(SolidColorBrush))]  
  
    public class ColorConverter : IValueConverter  
    {  
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)  
        {  
  
            string state = (string)value;  
            if ( state.Length > 0 )  
                return new SolidColorBrush(Colors.Green);  
            else  
                return new SolidColorBrush(Colors.Red);  

Hello, Do you mean like this.

The txtGebindeSlot1 control should bind the BackGround to a property (SolidColor) and when you set that property in code then the UI will use the value.

Can you make a sample for me? Thanks.

The code works not.
See here

Answer 2

Part 1: I will give you very simple demo of MVVM binding ViewModel to View. There are two ways of binding:

  //Method1 to bing Viewmodel to view
     PersonViewModel _viewModel = new PersonViewModel();
     DataContext = _viewModel;
    <!--Method2 to bing Viewmodel to view-->
        <!--<Window.DataContext>
            <local:PersonViewModel></local:PersonViewModel>
      </Window.DataContext>-->

Part 2 : Use log4net to write log for the app:

Step1:Search and install log4net in your project Nuget.
Step2:Configure the config for your project.
Step3:Add [assembly: log4net.Config.XmlConfigurator(Watch = true)] for your AssemblyInfo.cs.
Step4:Add following code in your App.xaml.cs to log the start/end of project.
Step5:Write the log in the project.

Here is my demo for you.

Answer 3

I can only suggest that you use WPF as it is supposed to be used and stop trying to use WinForms techniques.

A ViewModel is just that. It has properties that the UI uses to set background colours , fonts etc. The txtGebindeSlot1 control should bind the BackGround to a property (SolidColor) and when you set that property in code then the UI will use the value.

I am speaking from experience. I spent a while with WPF and eventually found that using WPF the correct way was much simpler and the code is much easier to deal with.