Modify the ObservableCollection element

Question

Modify the ObservableCollection element

I have added several items to the ObservableCollection and now I want to change one of them, for example:

_MyCollection[num].Data1 = someText;

As an example, according to the code below, the intent is: _MyCollection[5].Type = changedText;

_MyCollection.Add(new MyData
{
    Boundary = Text1,
    Type = Text2,
    Option = Text3
});

How can i do this?

+3

c # wpf observablecollection

Shibli 15 Mar 12 at 10:48

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2 answers

This will lead to an event CollectionChanged

:

MyData temp = _MyCollection[index];
temp.Type = changedText;
_MyCollection.SetItem(index, temp);

+1

Mike cowan 15 Mar 12 at 10:54

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Carsten · Accepted Answer · 2012-03-15T10:52:37+0000

I think you just want to see the changes right? This has nothing to do with the ObservableCollection, but with your object MyData

. It should implement INotifyPropertyChange

- if you do, you will see the changes you made.

public class MyData : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    private string type;
    public string Type
    {
      get { return type; }
      set
      {
         if (value != type)
         {
            type = value;
            NotifyPropertyChanged("Type");
         }
      }
    }

    // ... more properties

    private void NotifyPropertyChanged(String info)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(info));
        }
    }
}

Modify the ObservableCollection element

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