Binding To a TextBox Through Code-Behind

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I have a DataGrid and I have subscribed to the SelectedCellsChanged Event. If the number of cells selected is only one, I want to display the text of the particular cell in a TextBox with TwoWay Binding. But if the number of selected cells is more than one, I want the the TextBox to become empty and its binding to become null.

Can anyone help me with this?
Additional Data:
The DataGrid is bound to

C#

ObservableCollection<MyClass> MyRowList;

I know which cell is selected and I know the Name of the property. My property names go like this Column1, Column2, Column3 and so on. So if the 3rd cell of the third row is selected, the corresponding property would be MyRowList[rowIndex].Column3

I am assuming that the syntax would look something like this:

C#

private void DataGridControl_SelectedCellsChanged(object sender, SelectedCellsChangedEventArgs e)
        {
            int rowIndex, columnIndex;
            System.Windows.Controls.DataGrid tempDG = sender as System.Windows.Controls.DataGrid;
            if (tempDG.SelectedCells.Count == 0)
            {
                return;
            }
            else if (tempDG.SelectedCells.Count == 1)
            {
                rowIndex = getRowIndex; //assume that this works as the real method is a bit long
                columnIndex = getColumnIndex; 
                //set binding here to textbox
                        MyTextBox.Text = new Binding("MyRowList[" + rowIndex.ToString() + "].Column" + columnIndex.ToString); //I am not sure of the syntax, need help here
        }
        else if(tempDG.SelectedCells.Count > 1)
        {
        MytextBox.Binding = null;
        }

Posted 27-May-13 22:34pm

rohith naik

Updated 27-May-13 23:02pm

v2

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Francisco T. Chavez · Answer 1 · 2013-05-28T00:42:00

In WPF, three things are needed for a binding:

A target
A source
A Binding

It doesn't matter if you are doing this in XAML or in the code behind file, the concept is the same. In your case the target is the text property of TextBox Mytextbox, and the source is a single property of the selected item in you data grid.

To set the binding, we create an instance of the Binding class; set its Mode to TwoWay. We then set the source of the binding. We'll do this be telling the binding to look for a control with the name [information wasn't given in question]. This name should be the one in the DataGrid's x:Name property. Instead of targeting a cell in the DataGrid, we target the property you want from the item that is selected. We then finish this off by setting the binding to the TextBox's TextProperty attribute.

C#

// The binding
Binding b = new Binding();
b.Mode = BindingMode.TwoWay;

// The source
b.Path = new PropertyPath("SelectedValue.[The MyClass property I'm binding too]");
b.ElementName = "The x:Name of the datagrid.";

// The target
Mytextbox.SetBinding(TextBox.TextProperty, b);

Removing a one way binding can be done by setting a value on the target, but this doesn't work on a two way binding. So instead, I would advise you to set a one way binding to a property that doesn't exist, and disable the textbox.

C#

Binding b = new Binding();
b.Mode = BindingMode.OneWay;
b.Path = "FakeProperty";
MyTextbox.SetBinding(TextBox.TextProperty, b);
MyTextbox.IsEnabled = false;