.NET Tutorials, Forums, Interview Questions And Answers
Welcome :Guest
Sign In
Win Surprise Gifts!!!

Top 5 Contributors of the Month
Gaurav Pal
Post New Web Links

WPF 4 DataGrid (Binding to DataTable), where store new value of user edit fields? DataGrid architect

Posted By:      Posted Date: May 22, 2011    Points: 0   Category :JQuery

I looking for good artical about the DataGrid architecture, logical & visual.

I try to understand whre datagrid store the new value of cell, when user edit row in DataGrid. I realize that DataGrid not hold Copy of data. instead it Hold pointer to DataRow. But DataRow got new value only after user end the line Edit.

the code like:

DirectCast(DataGrid1.CurrentCell.Item, System.Data.DataRowView).Item(1) 

return the DataRow, not the new value during line Edit.

My question

1. Where DataGrid Hold the new value?

2. How access to Visual Element of each cell, like TextBlock inside the cell from Code?

View Complete Post

More Related Resource Links

Binding DataGrid to empty DataTable

Hi, I'm very much new to WPF and am finding it a bit tricky to find my way in the mass of (not always great) documentation. Right now I'm struggling to get the grid to display it's UI when bound to an empty datatable. In my XAML: <DataGrid Name="grid" ItemsSource="{Binding}" />  In my code-behind (MainWindow constructor, following InitializeComponent): var dt = new DataTable(); dt.Columns.Add("col1"); dt.Columns.Add("col2"); //var r = dt.Rows.Add("toto", "tata"); grid.DataContext = dt; If I comment out the line that adds a row to the table, all is well -- the grid generates columns and displays UI. But if the table is empty, the grid renders a thin horizontal white rectangle with no column names and it doesn't seem possible to interact with this at all. As it happens, I want the grid to be empty by default, so I need to somehow get the grid to play along. If anyone knows why this happens and what to do to solve it, I'd much appreciate the help!

How to get the combobox value inside Datagrid on Edit button click event

Hi     I have Datagrid template column like<DataGridTemplateColumn.CellTemplate></DataGridTemplateColumn>DataGridTemplateColumn Header="Edit" x:Name="Edit" ><DataGridTemplateColumn.CellTemplate></DataGridTemplateColumn.CellEditingTemplate></DataGridTemplateColumn>SelectionChanged="cmbDGTeam_SelectionChanged" IsTabStop="True" /></DataTemplate><ComboBox Height="22" IsEditable="True" IsReadOnly="True" ItemsSource="{Binding}" DisplayMemberPath="Title" SelectedValuePath="TeamID" x:Name="cmbDGTeam"  SelectedValue="{Binding Path=TeamID,Mode=TwoWay}"<DataGridTemplateColumn.CellEditingTemplate><DataTemplate><DataTemplate><TextBlock Text="{Binding Title}"/></DataTemplate></DataGridTemplateColumn.CellTemplate><DataGridTemplateColumn Header="Team" Width="75"><DataGridTemplateColumn.CellTemplate> and Edit button Template column <DataGridTemplateColumn Header="Edit" x:Name="Edit" > </DataGridTemplateColumn.CellTemplate></DataTemplate><Button Content="Edit" IsEnabled="False" x:Name="btnEdit" Click="btnEdit_Click" ></Button>&l

How to scroll the DataGrid (horizontally) when user drags a column header far left or right?

We're working with the WPF DataGrid and I have a question about  dragging column headers: The grid lets the user rearrange the columns, by dragging the column header left or right.  So far, so good. But, sometimes we have many columns, and only the first few columns are visible; so there is a horizontal scrollbar.  In such case, if the user drags a column header to the right edge of the DataGrid window, I want the DataGrid to scroll, automatically, one column at a time.  Is there an easy way to do that? (To be clear: yes, the user can already scroll horizontally by interacting with the horizontal scrollbar, but that isn't what I'm asking about.  I'm asking if the "drag a column header left or right" gesture can cause the DataGrid to scroll left or right.) I guess I could handle various low-level events, but it seems like it shouldn't be necessary -- DataGrid has so much functionality built-in, that I'm guessing it already has the ability to scroll when the user drags the column header to the edge.  So, is there either (a) a property that I can set, to tell the DataGrid to scroll when the user drags a column header to the edge of the window;  or (b) a code example showing how to achieve this effect myself?  Thanks!

Data Binding a DataGrid to a list fetch the same data multiple times

Hi, I'm using DataGrid to show data through data binding. My data are provided in a list. The setup I have is the following: DataGrid "binded" to the default view of my list that implement IList<T> and IList interfaces (MyList<T> : IList<T>, IList, INotifyCollectionChanged)             CollectionViewSource.GetDefaultView(_myList);             // Set the data context             DataContext = view; T: is here my 'business object' that hold the data, called 'MyRow'. Then the columns of the DataGrid are bound to public properties of 'MyRow' object. MyRow class has a public property of type 'object' (public object data[int index]) and first column of datagrid is bound to myRow.data[0], second column is bound to myRow.data[1] and so on.   When the datagrid is displayed, databinding kick in and my data are showed in the control. The issue I'm having is that data fetching is very repetitive even for the same rows. For example for a datagrid with 20 visible rows, the first row is fetched multiple times even if the datagrid is not resized or moved. I put break point inside my list (MyList<T> into This[T] property (public T this[int index]) and i got multiple hits into the property for the same index. Fetc

TwoWay Binding Datagrid To WCF Service?

Hello, i tried to bind a DataGrid in TwoWay Mode to a WCF Service. The Data get displayed but changes in DataGrid dont affect the Database, from which the WCF Service is getting the data.   I hope someone can help me... Thank you.     My Szenario: I have a WCF Service which offers exactly one Function which return a custom class. The custom class inherits from INotifyPropertyChanged and has only one DataMember, an ObservableList with my DB Entitys. //Service.svc.cs static testdatenEntities _context = null; private static testdatenEntities Get_context() { if (_context == null) { _context = new testdatenEntities(); } return _context; } public customData GetDataFromADO() { var _context = Get_context(); var result = (from lief in _context.LIEF_INFO.AsQueryable() orderby lief.LNR select lief).Skip(50).Take(50); ObservableCollection<LIEF_INFO> _ocol = new ObservableCollection<LIEF_INFO>(result); customData customdata = new customData() { List = _ocol }; return customdata; } //IService.cs [DataContract] public class customData : INotifyPropertyChanged { ObservableCollection<LIEF_INFO> _ocol = new ObservableCollection<LIEF_INFO>(); [DataMember] public ObservableCollection<LIEF_INFO> List {

Binding DataGrid RowDetailTemplate Using MVVM

In this post I will show you how you can bind the RowDetailTemplate of the data grid using the MVVM pattern. Below are the image of the sample code here you can see the default page in Image 1 and when user click on any of the record then detail of the record is shown in the RowDetailTemplate which also consist of the data grid control which you can see in the Image 2.

Click.CommandParameter null when binding on Button inside DataGrid DataGridTemplateColumn

I am having trouble getting a Click.CommandParameter to pass through with a bound Click.Command. I have a DataGrid with a DataGridTemplateColumn that contains a couple of Buttons. Using a suggestion found on the forum (http://social.msdn.microsoft.com/Forums/en/wpf/thread/541024a9-3d7e-4c6a-b88e-9a7eb7ee83a9), I was able to get the Click.Command to bind to the right command, but when arriving in the corresponding method in my ViewModel, the parameter is null.  Here is my xaml for my DataGridTemplateColumn <data:DataGridTemplateColumn Header="Case">  <data:DataGridTemplateColumn.CellTemplate>   <DataTemplate >    <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">     <Button Content="Open" Margin="6,0" command:Click.Command="{Binding RelativeSource={RelativeSource AncestorType={x:Type data:DataGrid}}, Path=DataContext.OpenCaseCommand}" CommandParameter="{Binding}"  />     <Path Data="M1,1 L1,2" Stroke="#FFCCCCCC"/>     <Button Content="Rename" />    </StackPanel>   </DataTemplate>  </data:DataGridTemplateColumn.CellTemplate> </data:DataGridTemplateColumn> I used Snoop to see what was going on. Everything

Binding a computed value to datagrid column

Hi, I have a WPF Datagrid with tree colums (A, B,C) which are bound to an Observable collection. The value of C is C=A+B. The value of A and B are updated via an event that I have subscribed to ( a realtime data feed). What is the best way to update the value of C each and every time A or B get chaged ? I'm new to WPF and should I use a converter to achive this ? Thanks V

Adding new rows to Datagrid with a Combobox column generate "two-way binding requires path or xpath"



    I have datagrid control with a template combobox column like:

 <DataGridTemplateColumn Header="Fault code" Width="75">
                                    <TextBlock Text="{Binding FaultCode1}" />

Dynamically Assign Datagrid Column Binding from XAML


I am trying to build a generic user control that will serve as a quick list maintenance screen.

I have a base ViewModel that has two string properties IDColumnName and DisplayColumnName and then a collection of objects to be edited.  Inherited view models will be created for each object type that needs to be maintained.  The usercontrols datacontext is set to the viewmodel.

What I want to do is have the datagrid, who's itemssource is bound to the collection of objects in the viewmodel, have one column and have that one column bound to the property specified in the DisplayColumnName property of the viewmodel, and I'd like to do it all in XAML.  I've got the datagrids rowdetailstemplate being dynamically determined based on the object type but am struggling with dynamically setting which property the one column displays.

WPF DataGrid TemplateColumn does not go into edit mode when tabbed to.

I am using a TemplateColumn with the WPFToolKit DataGrid.  When I tab thru the other columns when in edit mode the cells go right into edit mode, but when I hit the cell with the TemplateColumn I have to click the tab twice to get into edit mode.




WPF DataGrid TemplateColumn does not go into edit mode when tabbed to first time.

I am using a TemplateColumn with the .Net4.0 DataGrid.  When I tab thru the other columns when in edit mode the cells go right into edit mode, but when I hit the cell with the TemplateColumn I have to click the tab twice to get into edit mode.




Any Workarounds. I came across a work around http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/93d66047-1469-4bed-8fc8-fa5f9bdd2166/ but I cannot use that because of the bug http://social.msdn.microsoft.com

I need help please : how do i bind dataGrid to dataTable Programmatically ?


Hi all,


please i need to know if i could  bind dataGrid to dataTable Programmatically using wpf V.S 2010 (without using Xaml code)???


i google it before but i saw solution using (DataSet) and this not useful for me because its huge application.

Note : data source is MySql.


Thanks a lot .


Abed Salem

DataGrid and DataTable



In my WPF application, I want to create an Empty Table.

I've created an empty DataTable (created columns and rows) and i want to display it using DataGrid.

I can't make the DataGrid to work together with my DataTable...

(i'm creating my DataTable via code and not via XAML).

can anyone help?




Entering edit mode with RichTextBox in a DataGrid column


Hi guys,

I have a DataGrid TemplateColumn with a readonly RichTextBox in its CellTemplate and a (editable) RichTextBox in its CellEditingTemplate. The problem is that when I double click the RichTextBox, it selects its text instead of bringing the DataGrid to Edit mode.

As a workaround, I hooked PreviewDoubleClick on the RichTextBox and called DataGrid.BeginEdit(). Although this does bring the editable RichTextBox but the Caret is always at the beginning of the text instead of the location where I double clicked.

Any Ideas how to handle this?


Syed Mehroz Alam
My Blog | My Articles

DataGrid in a User Control. How to make it resizable in a form.


I embed the DataGridView control in a User Control.  The datagridview covers the entire user control.

When I used the user control in a form, I want to be able to size it the way I want to.  When I expand and shrink the user control, I want the embedded DataGridView to grow and shrink accordingly with the user control.  How would I go about doing that?

Without changing any of the default property values, when I place the user control on a form, the size stays fixed when used in a form.  That seems to happen only when you have a DataGridView in a user control.  

Thanks in advance.
ASP.NetWindows Application  .NET Framework  C#  VB.Net  ADO.Net  
Sql Server  SharePoint  Silverlight  Others  All   

Hall of Fame    Twitter   Terms of Service    Privacy Policy    Contact Us    Archives   Tell A Friend