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Getting the Selected Row Item in a WPF DataGrid: A Comprehensive Tutorial

This tutorial delves into the various methods for retrieving the selected row item in a WPF `DataGrid`. We'll cover different scenarios, from simple selection handling to more complex data binding and event-driven approaches, with code examples for each. This comprehensive guide will provide you with the knowledge to confidently extract data from the selected row in your `DataGrid`.

*1. Understanding the `DataGrid` and Selection*

Before diving into the code, it's crucial to understand how the `DataGrid` manages selection.

*SelectionMode:* Determines whether the user can select a single row, multiple rows, or even individual cells. Common values are:
`Single`: Only one row can be selected at a time.
`Multiple`: Allows selecting multiple rows (usually using Ctrl or Shift keys).
`Extended`: Similar to `Multiple`, providing more advanced selection options.
*SelectionUnit:* Defines what the user can select. Common values:
`FullRow`: Selects the entire row.
`Cell`: Allows selecting individual cells.
`CellOrRowHeader`: Selects either a cell or the row header.
*SelectedItem:* Holds a reference to the data item representing the currently selected row (or `null` if no row is selected). This is the most direct way to get the row's data object.
*SelectedItems:* A collection (e.g., `ObservableCollection`) holding references to all the data items representing the selected rows when `SelectionMode` is `Multiple` or `Extended`.
*SelectedIndex:* The zero-based index of the currently selected row. Useful when you need the position of the selected item within the data source.
*SelectedCells:* A collection of `DataGridCellInfo` objects representing the selected cells (when `SelectionUnit` is `Cell` or `CellOrRowHeader`). You'll typically use this when you're working with individual cell selection.

**2. Basi ...

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