How to iterate in a datagrid to get rows and columns in WPF ?

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I have a DataGrid with two columns , one theme is checkbox column and the other is text column .

I want to iterate through DataGrid Rows and check if CheckBox Cell was Checked , then add this row to list of employee

it's in winforms all to do that:
foreach(var r in DataGridRows)
{
if(r.cell[0].value == true)
{
// TODO
}

}

What I have tried:

for (int i = 0; i < dg.Items.Count; i++)
    {
        DataGridRow row = (DataGridRow)dg.ItemContainerGenerator.ContainerFromIndex(i);
            for (int j = 0; j < dg.Columns.Count; j++)
            {
                var cellContent = dg.Columns[j].GetCellContent(row) as CheckBox;
               
            }
    }

Posted 31-Dec-17 11:58am

Ahmed Dabas

Updated 1-Jan-18 18:18pm

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PureNsanity · Answer 1 · 2018-01-01T18:18:00

Typically speaking you want to avoid working through UI elements directly unless it's UI specific, and in your problem this is about a business relationship so you really want it in the view model. In this example I would recommend some sort of EmployeeViewModel with an IsAdded boolean property (of course make the property name meaningful to what it's added too).

I would have the CheckBox be read only and have a button below the grid bound to a command on the collection that's something like ICommand AddEmployeeToCollectionCommand passing the EmployeeViewModel (I prefer the DelegateCommand implementation in PRISM). Of course you're also need to have a remove button or use the button as an Add/Remove (you can use a converter or trigger on the button to change the name appropriately).

If you really want to handle the click event then I recommend handling the click event at the grid level (these are routed commands). That way the grid/view can manipulate the higher level view model (hopefully there is one) by toggling the status of the source data context.

Andrew Baylis · Answer 2 · 2017-12-31T14:08:00

I recommend an alternative - use a bound datagrid where the items have the two fields you want shown in the grid. For example:

C#

public class DataItem : DependencyObject
{
    public static readonly DependencyProperty DisplayTextProperty = DependencyProperty.Register("DisplayText", typeof(string), typeof(DataItem), new PropertyMetadata(default(string)));
    public string DisplayText { get { return (string)GetValue(DisplayTextProperty); } set { SetValue(DisplayTextProperty, value); } }
    public static readonly DependencyProperty IsSelectedProperty = DependencyProperty.Register("IsSelected", typeof(bool), typeof(DataItem), new PropertyMetadata(default(bool)));
    public bool IsSelected { get { return (bool)GetValue(IsSelectedProperty); } set { SetValue(IsSelectedProperty, value); } }
}

Using a DependencyObject ensures the DataGrid maps the properties properly.
Now just create a list of these DataItems and assign the list to the DataGrid's ItemSource

C#

...
List<DataItem> list = new List<DataItem>();
...fill list with items ...
dataGrid.ItemsSource = list;
...

To check through the required ones, just scan the list either using a foreach loop or a LINQ selector.

C#

foreach(DataItem item in list)
{
  if (item.IsSelected) 
  {
   ... do your stuff here ...
  }
}

How to iterate in a datagrid to get rows and columns in WPF ?

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