WPF DataGrid: Tri-state Sorting sample

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discount furniture » WPF DataGrid: Tri-state Sorting sample — Fri, 29 Aug 2008 19:19:52 GMT

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WPF DataGrid: Stock and Template Columns

Vincent Sibal's Blog — Fri, 29 Aug 2008 19:32:36 GMT

Overview The DataGrid uses a set of DataGridColumns to describe how to display its data just like a GridView

WPF DataGrid: Working with DataGridComboBoxColumn

Vincent Sibal's Blog — Fri, 29 Aug 2008 19:35:13 GMT

If you haven’t already, you can download the binaries and source for the DataGrid here . DataGridComboBoxColumn

re: WPF DataGrid: Tri-state Sorting sample

_gdc — Tue, 02 Sep 2008 12:59:30 GMT

Hello,

I need to use the DataGrid with a class that implements IEnumerable<>,

I don't want to subclass ObservableCollection<>,

but I have problems doing this.

Using your example, I change your class:

public class People : ObservableCollection<Person>

with this new (where I use _peopleList to keep the data):

public class People : IEnumerable<Person>

{

private List<Person> _peopleList;

private Random random = new Random();

public People()

{

CreateGenericPersonData(1);

}

public People(int multiplier)

{

CreateGenericPersonData(multiplier);

}

private void CreateGenericPersonData(int multiplier)

{

_peopleList = new List<Person>();

if (multiplier > 0)

{

for (int i = 0; i < multiplier; i++)

{

_peopleList.Add(new Person("George", "Washington", GenerateRandomDate()));

_peopleList.Add(new Person("John", "Adams", GenerateRandomDate()));

_peopleList.Add(new Person("Thomas", "Jefferson", GenerateRandomDate()));

//...

_peopleList.Add(new Person("George", "W.", "Bush", GenerateRandomDate()));

}

private DateTime GenerateRandomDate()

{

int randInt = random.Next();

return new DateTime(Convert.ToInt64(randInt));

}

#region IEnumerable<Person> Members

public IEnumerator<Person> GetEnumerator()

{

return _peopleList.GetEnumerator();

}

#endregion

#region IEnumerable Members

System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()

{

return _peopleList.GetEnumerator();

}

#endregion

}

If I try this, I receive the exception:

Cannot create instance of 'DataGridBasicSample_Demo' defined in assembly ...

Where am I wrong?

Thank you

re: WPF DataGrid: Tri-state Sorting sample

vinsibal — Tue, 02 Sep 2008 16:56:30 GMT

_gdc,

In my example I am getting the view from the ItemsSource and expect a ListCollectionView. Since you have changed it to IEnumerable<T> it is no longer a ListCollectionView. In the constructor of my sample, try removing the lines related to getting the CollectionViewSource. It should work after that.

-Vince

re: WPF DataGrid: Tri-state Sorting sample

Karl — Mon, 08 Sep 2008 14:51:57 GMT

Started playing with the Datagrid in a WPF app runing on a desktop.

I have notice that when I drag the scroll button on some machines, there is a pretty chunky lag. The content redraw updates in a unpleasant, laggy way.

There were only 500 items in the grid...

re: WPF DataGrid: Tri-state Sorting sample

vinsibal — Mon, 08 Sep 2008 15:28:57 GMT

Karl,

Would you mind posting the specs for the machine that you find that it is lagging.

Thanks,

Vince

re: WPF DataGrid: Tri-state Sorting sample

Karl — Mon, 08 Sep 2008 15:29:40 GMT

Opps never mind. Scrolling works fine.

The issue is that if I set my ItemSource to an custom

ObservableCollection<T>

T must define a public string property named "Id" or the binding will throw a bad path and silently swallow the exception on all the rows.

Which absolutely kills the performance of scroll....

You get this in the output window of the debugger.

System.Windows.Data Error: 39 :

BindingExpression path error: 'Id' property not found on 'object' ''RowProxy' (HashCode=11295760)'.

BindingExpression:Path=Id; DataItem='RowProxy' (HashCode=11295760);

target element is 'DataGridRow' (Name='');

target property is 'Header' (type 'Object')

re: WPF DataGrid: Tri-state Sorting sample

RobertT — Tue, 16 Sep 2008 10:36:48 GMT

Hi Vincent!

Will you be so kind and help me with a following scenario? =)

Imagine I have a DataGrid bound with ObservableCollection. I want to prevent user from editing existing rows and enable only to add new rows and edit'em right in a place or delete new or existing rows. How can I achieve such a scenario?

Best regards,

RobertT

re: WPF DataGrid: Tri-state Sorting sample

vinsibal — Tue, 16 Sep 2008 16:07:14 GMT

RobertT,

One possible solution is to listen to the DataGrid.BeginningEdit event and cancel the BeginEdit if the row they are trying to edit is an existing row. Deleting is a separate operation so it will work as normal with this solution.

.NET 3.5 SP1 and WPF DataGrid CTP are out now!

Vincent Sibal's Blog — Tue, 16 Sep 2008 18:14:26 GMT

As you might have heard, .NET Framework 3.5 SP1 and Visual Studio 2008 SP1 are out today! There are a

WPF DataGrid - Clipboard Paste Sample

Vincent Sibal's Blog — Fri, 19 Sep 2008 18:07:03 GMT

In the v1 release (and CTP) of the WPF DataGrid there will be support for Clipboard.Copy but no support

re: WPF DataGrid: Tri-state Sorting sample

Priya — Thu, 04 Dec 2008 15:31:12 GMT

Hi, can v populate DataGrid dynamically. If yes, can u post a sample on the same using DataGridTextColumn() and DataGridRow() (similar to how we add in DataTable) Or is there other way of doing it cos am stuck with it.

Thanks in Advance.

re: WPF DataGrid: Tri-state Sorting sample

vinsibal — Thu, 18 Dec 2008 22:51:50 GMT

Priya,

DataGrid can be populated dynamically, but not isn the same way as the DataTable. The DataGrid is bound to an ItemsSource so as items are added and removed the DataGrid will update as necessary. Could you expand on your scenario a bit and hopefully I can provide further assistance.

re: WPF DataGrid: Tri-state Sorting sample

Bharti — Thu, 12 Nov 2009 09:37:28 GMT

Hello,

I am using WPF toolokit's data grid, and inthat grid I have a column for checkbox which I add as below:

<toolkit:DataGridTemplateColumn >

<toolkit:DataGridTemplateColumn.CellTemplate>

<CheckBox Click="OnUsedClicked"

IsChecked="{Binding Path=Used}"

</DataTemplate>

</toolkit:DataGridTemplateColumn.CellTemplate>

</toolkit:DataGridTemplateColumn>

I would like to sort on all columns of my grid, so to the grid defination I added

CanUserSortColumns="True" to my grid.

On doing this the rest of the columns get sorted but not the checkbox column.By checkbox column sorting I mean that all checked boxes(rows) to be together and all unchecked boxes(rows) to be together. I do understand there might be multiple checked so what basis needs to be used, I have a time column , I can use that along with it.

i.e sorting on Checkbox + Time

this would lead to all say unchecked together , based on time as the second parameter.

I am not sure if this is possible, if yes how?

Regards

Barti

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