Datagrid binding in WPF

27
votes

I know this has been asked already but I have done almost everything what is suggested by developers.

<DataGrid x:Name="Imported" VerticalAlignment="Top" DataContext="{Binding Source=list}"  AutoGenerateColumns="False" CanUserResizeColumns="True">
    <DataGrid.Columns>                
        <DataGridTextColumn Header="ID" Binding="{Binding Path=ID}"/>
        <DataGridTextColumn Header="Date" Binding="{Binding Path=Date}"/>
    </DataGrid.Columns>
</DataGrid>

I am trying to show this in modal dialog box and populating the license list in the constructor of the modal dialog box. But still nothing is getting populated inside the datagrid.

Constructor code:

public diagboxclass()
{
    List<object> list = new List<object>();
    list = GetObjectList();
}

public class object
{
    string id;
    DateTime date;
    public string ID
    {
        get { return id; }
        set { id = value; }
    }
    public DateTime Date
    {
        get { return date; }
        set { date = value; }
    }
}

Do you guys think something to do with the object list?

3
c#wpfxamlbindingdatagrid
My list object has more other properties than the two above which im not binding? would that can make any diff? – alice7
Probably not. Please share some more of your XAML (including how list is defined) so we can help further. – Dan J
I have added code on the top. – alice7
@alice7 What type is the diagboxclass? What type is the XAML class containing the DataGrid? If diagboxclass is in the code-behind of the XAML file, you should assign list to the DataContext property of that class. You should then be able to bind to list from within the XAML. – Dan J
Hi, If one of the Answers helped you back in 2011 please mark it as Answer, thx – WiiMaxx

3 Answers

41
votes

PLEASE do not use object as a class name:

public class MyObject //better to choose an appropriate name
{
    string id;
    DateTime date;
    public string ID
    {
       get { return id; }
       set { id = value; }
    }
    public DateTime Date
    {
       get { return date; }
       set { date = value; }
    }
}

You should implement INotifyPropertyChanged for this class and of course call it on the Property setter. Otherwise changes are not reflected in your ui.

Your Viewmodel class/ dialogbox class should have a Property of your MyObject list. ObservableCollection<MyObject> is the way to go:

public ObservableCollection<MyObject> MyList
{
     get...
     set...
}

In your xaml you should set the Itemssource to your collection of MyObject. (the Datacontext have to be your dialogbox class!)

<DataGrid ItemsSource="{Binding Source=MyList}"  AutoGenerateColumns="False">
   <DataGrid.Columns>                
     <DataGridTextColumn Header="ID" Binding="{Binding ID}"/>
     <DataGridTextColumn Header="Date" Binding="{Binding Date}"/>
   </DataGrid.Columns>
</DataGrid>
24
votes

Without seeing said object list, I believe you should be binding to the DataGrid's ItemsSource property, not its DataContext.

<DataGrid x:Name="Imported" VerticalAlignment="Top" ItemsSource="{Binding Source=list}"  AutoGenerateColumns="False" CanUserResizeColumns="True">
    <DataGrid.Columns>                
        <DataGridTextColumn Header="ID" Binding="{Binding ID}"/>
        <DataGridTextColumn Header="Date" Binding="{Binding Date}"/>
   </DataGrid.Columns>
</DataGrid>

(This assumes that the element [UserControl, etc.] that contains the DataGrid has its DataContext bound to an object that contains the list collection. The DataGrid is derived from ItemsControl, which relies on its ItemsSource property to define the collection it binds its rows to. Hence, if list isn't a property of an object bound to your control's DataContext, you might need to set both DataContext={Binding list} and ItemsSource={Binding list} on the DataGrid...)

5
votes

try to do this in the behind code

   public diagboxclass()
   {
         List<object> list = new List<object>();
         list = GetObjectList();
         Imported.ItemsSource = null;
         Imported.ItemsSource = list;
   }

Also be sure your list is effectively populated and as mentioned by Blindmeis, never use words that already are given a function in c#.