How can i access a control in mvvm model in viewmodel?

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5.00/5 (1 vote)

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I have a WPF Window, and in that window I have a grid.

I use M-V-VM model and I want to add a TextBox to the grid dynamically in code(in viewmodel)

How can I get access to the grid?

Posted 1-Nov-10 21:52pm

rezakhalili

Updated 1-Nov-10 22:39pm

Dalek Dave

v2

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Dalek Dave 2-Nov-10 4:39am

Edited for Grammar, Syntax and Readability.

3 solutions

Solution 2

I write it

Grid grid = new Grid();
           grid = App.Current.Windows[1].FindName("grid1") as Grid;
           if (grid != null)
           {
               RowDefinition rd = new RowDefinition();
               rd.Height = GridLength.Auto;
               grid.RowDefinitions.Add(rd);
               TextBox txt = new TextBox();
               txt.Name = "txtNewAdd";
               txt.Height = 23;
               txt.VerticalAlignment = VerticalAlignment.Top;

               //txtFname is in view Layer
               TextBox txtName = new TextBox();
               txtName= grid.FindName("txtFname") as TextBox;
               if (txtName!=null)
               {
                   txt.Background = txtName.Background ;

               }
               Grid.SetColumn(txt, 1);
               Grid.SetRow(txt,(grid.RowDefinitions.Count-1));

               grid.Children.Add(txt);
           }

Posted 2-Nov-10 20:19pm

rezakhalili

Updated 2-Nov-10 20:24pm

v2

Solution 3

While probably not optimal given the MVVM best practices, you could have an ObservableCollection(Of UIElement) to which the Grid or ItemsControl is bound.

Your ViewModel or Model would create the new control and add it to the collection.

Posted 7-Jan-13 5:53am

rantinori

Comments

fjdiewornncalwe 7-Jan-13 12:04pm

Please check the date that a question was posted on. The chances that the OP is still looking for a solution from over two years ago is highly unlikely, and the question already has two solution posted. If the question is this old, please don't add new answers to it as it just bumps it back to the front of the queue which it shouldn't be doing. Cheers and welcome to CP.

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voloda2 · Accepted Answer · 2010-11-01T22:15:00

Solution 1

As I understand MVVM, you shouldn't access view (or UI elements) directly from view model (or another layer below UI). If you need something like this, you should do it in view layer only.

Posted 1-Nov-10 22:15pm

voloda2

Comments

Dalek Dave 2-Nov-10 4:39am

Good Answer.

Martin.Smith 9-Nov-10 11:19am

Completely agree - ViewModel should not know anything about the view (or the controls it contains)