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DataGridView.ProcessDialogKey(Keys) Method

  • Reference

Definition

Namespace:
System.Windows.Forms
Assembly:
System.Windows.Forms.dll

Processes keys, such as the TAB, ESCAPE, ENTER, and ARROW keys, used to control dialog boxes.

protected:
 override bool ProcessDialogKey(System::Windows::Forms::Keys keyData);
protected override bool ProcessDialogKey (System.Windows.Forms.Keys keyData);
override this.ProcessDialogKey : System.Windows.Forms.Keys -> bool
Protected Overrides Function ProcessDialogKey (keyData As Keys) As Boolean

Parameters

keyData
Keys

A bitwise combination of Keys values that represents the key or keys to process.

Returns

Boolean

true if the key was processed; otherwise, false.

Exceptions

InvalidCastException

The key pressed would cause the control to enter edit mode, but the EditType property of the current cell does not indicate a class that derives from Control and implements IDataGridViewEditingControl.

Exception

This action would commit a cell value or enter edit mode, but an error in the data source prevents the action and either there is no handler for the DataError event or the handler has set the ThrowException property to true.

Examples

The following code example demonstrates how to change the behavior of the ENTER key in a DataGridView subclass by overriding the ProcessDataGridViewKey and ProcessDialogKey methods. In the example, the ENTER key has the same behavior as the RIGHT ARROW key, making it easier for a user to edit multiple cells in a single row of data.

public class CustomDataGridView : DataGridView
{
    protected override bool ProcessDialogKey(Keys keyData)
    {
        // Extract the key code from the key value. 
        Keys key = (keyData & Keys.KeyCode);

        // Handle the ENTER key as if it were a RIGHT ARROW key. 
        if (key == Keys.Enter)
        {
            return this.ProcessRightKey(keyData);
        }
        return base.ProcessDialogKey(keyData);
    }

    protected override bool ProcessDataGridViewKey(KeyEventArgs e)
    {
        // Handle the ENTER key as if it were a RIGHT ARROW key. 
        if (e.KeyCode == Keys.Enter)
        {
            return this.ProcessRightKey(e.KeyData);
        }
        return base.ProcessDataGridViewKey(e);
    }
}

Public Class CustomDataGridView
    Inherits DataGridView

    <System.Security.Permissions.UIPermission( _
        System.Security.Permissions.SecurityAction.LinkDemand, _
        Window:=System.Security.Permissions.UIPermissionWindow.AllWindows)> _
    Protected Overrides Function ProcessDialogKey( _
        ByVal keyData As Keys) As Boolean

        ' Extract the key code from the key value. 
        Dim key As Keys = keyData And Keys.KeyCode

        ' Handle the ENTER key as if it were a RIGHT ARROW key. 
        If key = Keys.Enter Then
            Return Me.ProcessRightKey(keyData)
        End If

        Return MyBase.ProcessDialogKey(keyData)

    End Function

    <System.Security.Permissions.SecurityPermission( _
        System.Security.Permissions.SecurityAction.LinkDemand, Flags:= _
        System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode)> _
    Protected Overrides Function ProcessDataGridViewKey( _
        ByVal e As System.Windows.Forms.KeyEventArgs) As Boolean

        ' Handle the ENTER key as if it were a RIGHT ARROW key. 
        If e.KeyCode = Keys.Enter Then
            Return Me.ProcessRightKey(e.KeyData)
        End If

        Return MyBase.ProcessDataGridViewKey(e)

    End Function

End Class

Remarks

This method is called in edit mode to handle keyboard input that is not handled by the hosted editing control.

If a key press is determined to not be an input key, it will be sent to the base class for processing.

Notes to Inheritors

When overriding this method, a control should return true to indicate that it has processed the key. For keys that are not processed by the control, return the result of the base version of this method.

Applies to

See also