How Can I Restrict a WPF TextBox to Accept Only Numeric Input?

Ensuring Numeric Input in WPF TextBoxes

WPF offers robust tools for managing user input, including the ability to restrict input to specific character types within a TextBox. This is particularly useful when dealing with data requiring strict formatting, such as numeric-only fields.

We can leverage the PreviewTextInput event, fired whenever a character is typed into the TextBox. This event handler allows us to validate the input and prevent non-numeric characters by setting e.Handled to true. The example below uses a regular expression for efficient validation.

To further enhance input control, we can also handle the DataObject.Pasting event. This event intercepts paste operations, enabling us to check the pasted text for invalid characters and cancel the paste using e.CancelCommand() if necessary.

By combining these event handlers, we guarantee that only numeric values are accepted into the WPF TextBox, thus preserving data integrity and improving user experience.

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