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grimpows

•Created by grimpows on 9/8/2022 in #help

Dynamic Binding for DataGrid WPF

following this article : https://paulstovell.com/dynamic-datagrid/ i'm stuck at the "Rendering basic columns in a DataGrid" section. I dont really see where i should put that code in a MVVM practice. should i create the entire datagrid in the VM ? should i trigger on some ItemsSource updated event in the code behind ? ... fixed with help of https://stackoverflow.com/questions/64687172/how-to-autogenerate-datagrid-columns-for-collection-of-child-type-from-collectio first i do create a Data class that contain my Records :

//the BindableBase is from prism but is same as implementation of INotifyPropertyChanged
public class Data : BindableBase
    {
        private ObservableCollection<Record> _records = new();
        public ObservableCollection<Record> Records
        {
            get { return _records; }
            set { 
                SetProperty(ref _records, value);
            }
        }
    }

//the BindableBase is from prism but is same as implementation of INotifyPropertyChanged
public class Data : BindableBase
    {
        private ObservableCollection<Record> _records = new();
        public ObservableCollection<Record> Records
        {
            get { return _records; }
            set { 
                SetProperty(ref _records, value);
            }
        }
    }

record :

public class Record
    {
        private readonly ObservableCollection<Property> properties = new ObservableCollection<Property>();

        public Record(params Property[] properties)
        {
            foreach (var property in properties)
                Properties.Add(property);
        }

        public ObservableCollection<Property> Properties
        {
            get { return properties; }
        }


    }

public class Record
    {
        private readonly ObservableCollection<Property> properties = new ObservableCollection<Property>();

        public Record(params Property[] properties)
        {
            foreach (var property in properties)
                Properties.Add(property);
        }

        public ObservableCollection<Property> Properties
        {
            get { return properties; }
        }


    }

property

public class Property 
    {
        public Property(string name, object value)
        {
            Name = name;
            Value = value;
        }

        public string Name { get; private set; }
        public object Value { get; set; }

    }

public class Property 
    {
        public Property(string name, object value)
        {
            Name = name;
            Value = value;
        }

        public string Name { get; private set; }
        public object Value { get; set; }

    }

in your VM you can instanciate your prop with

public class SomeViewModel: ViewModelBase
{
  private Data _data = new();
  public Data Data
  {
    get { return _data; }
    set { SetProperty(ref _data, value); }
  }
}

public class SomeViewModel: ViewModelBase
{
  private Data _data = new();
  public Data Data
  {
    get { return _data; }
    set { SetProperty(ref _data, value); }
  }
}

60 replies

CC#

•Created by grimpows on 8/18/2022 in #help

Binding to Dictionary in WPF with a binding KEY

hello i have a very specific problem related to WPF : i have a listbox with itemsSource <ListBox ItemsSource="{Binding someKeyValuePairList}">
</ListBox> i could show the Key with <ListBox ItemsSource="{Binding someKeyValuePairList}"> <ListBox.ItemTemplate> <DataTemplate> <Grid> <TextBlock Margin="2" Text="{Binding Key}" /> .... </ListBox> and i also have some Dictionary where i want to access value who contain a ViewModel with the Key i have <ListBox ItemsSource="{Binding someKeyValuePairList}"> <ListBox.ItemTemplate> <DataTemplate> <Grid> ---> if i hardcode the key this working <ContentControl Content="{Binding DataContext.SomeDictionaryWithObject[test].ViewModel, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}"/> ----> if i want to use the Value {Binding Key} this dont work ... <ContentControl Content="{Binding DataContext.SomeDictionaryWithObject[{Binding Key}].ViewModel, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}"/> </Grid> </DataTemplate>
</ListBox.ItemTemplate> </ListBox> (for information i also have setted a DataTemplate for my ViewModel so the content control render the associated view)

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