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UpDownBase.InterceptArrowKeys Property

Gets or sets a value indicating whether the user can use the UP ARROW and DOWN ARROW keys to select values.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)

public bool InterceptArrowKeys { get; set; }
/** @property */
public boolean get_InterceptArrowKeys ()

/** @property */
public void set_InterceptArrowKeys (boolean value)

public function get InterceptArrowKeys () : boolean

public function set InterceptArrowKeys (value : boolean)

Property Value

true if the control allows the use of the UP ARROW and DOWN ARROW keys to select values; otherwise, false. The default value is true.

If the InterceptArrowKeys property is set to true and the spin box (also known as an up-down control) has focus, the user can use the UP ARROW and DOWN ARROW keys to select values.

The following code example uses the derived class NumericUpDown and sets some of its properties derived from UpDownBase. This code requires that you have a NumericUpDown control named numericUpDown1, two ComboBox controls named comboBox1 and comboBox2, and three CheckBox controls named checkBox1, checkBox2, and checkBox2 created on a form. Add the following items to comboBox1: None, Fixed3D, and FixedSingle. Add the following items to comboBox2: Left, Right, and Center.

The code allows you to change the property values at run time and see how each affects the appearance and behavior of the spin box.

private void comboBox1_SelectedIndexChanged(Object sender, 
                                             EventArgs e)
 {
      // Set the BorderStyle property.
     switch(comboBox1.Text)
     {
         case "Fixed3D":
             numericUpDown1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
             break;
         case "None":
             numericUpDown1.BorderStyle = System.Windows.Forms.BorderStyle.None;
             break;
         case "FixedSingle":
             numericUpDown1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
             break;
     }
 }
 
 private void comboBox2_SelectedIndexChanged(Object sender, 
                                             EventArgs e)
 {
      // Set the TextAlign property.    
     switch (comboBox2.Text)
     {
         case "Right":
             numericUpDown1.TextAlign = HorizontalAlignment.Right;
             break;
         case "Left":
             numericUpDown1.TextAlign = HorizontalAlignment.Left;
             break;
         case "Center":
             numericUpDown1.TextAlign = HorizontalAlignment.Center;
             break;
     }
 }
 
 private void checkBox1_Click(Object sender, 
                              EventArgs e)
 {
      // Evaluate and toggle the ReadOnly property.
     if (numericUpDown1.ReadOnly)
     {
         numericUpDown1.ReadOnly = false;
     }
     else
     {
         numericUpDown1.ReadOnly = true;
     }
 }
 
 private void checkBox2_Click(Object sender, 
                              EventArgs e)
 {
      // Evaluate and toggle the InterceptArrowKeys property.
     if (numericUpDown1.InterceptArrowKeys)
     {  
         numericUpDown1.InterceptArrowKeys = false;
     }
     else
     {
         numericUpDown1.InterceptArrowKeys = true;
     }
 }
 
 private void checkBox3_Click(Object sender, 
                              EventArgs e)
 {
      // Evaluate and toggle the UpDownAlign property.
     if (numericUpDown1.UpDownAlign == LeftRightAlignment.Left)
     {
         numericUpDown1.UpDownAlign = LeftRightAlignment.Right;
     }
     else
     {
         numericUpDown1.UpDownAlign = LeftRightAlignment.Left;
     }
 }
 

    private void comboBox1_SelectedIndexChanged(Object sender, EventArgs e)
    {
        // Set the BorderStyle property.
        if (comboBox1.get_Text().Equals("Fixed3D")) {
            numericUpDown1.set_BorderStyle(BorderStyle.Fixed3D);
        }
        else {
            if (comboBox1.get_Text().Equals("None")) {
                numericUpDown1.set_BorderStyle(BorderStyle.None);
            }
            else {
                if (comboBox1.get_Text().Equals("FixedSingle")) {
                    numericUpDown1.set_BorderStyle(BorderStyle.FixedSingle);
                }
            }
        }        
    }//comboBox1_SelectedIndexChanged
    
    private void comboBox2_SelectedIndexChanged(Object sender, EventArgs e)
    {
        // Set the TextAlign property.    
        if (comboBox2.get_Text().Equals("Right")) {
            numericUpDown1.set_TextAlign(HorizontalAlignment.Right);
        }
        else {
            if (comboBox2.get_Text().Equals("Left")) {
                numericUpDown1.set_TextAlign(HorizontalAlignment.Left);
            }
            else {
                if (comboBox2.get_Text().Equals("Center")) {
                    numericUpDown1.set_TextAlign(HorizontalAlignment.Center);
                }
            }
        }
    } //comboBox2_SelectedIndexChanged

    private void checkBox1_Click(Object sender, EventArgs e)
    {
        // Evaluate and toggle the ReadOnly property.
        if (numericUpDown1.get_ReadOnly()) {
            numericUpDown1.set_ReadOnly(false);
        }
        else {
            numericUpDown1.set_ReadOnly(true);
        }
    } //checkBox1_Click

    private void checkBox2_Click(Object sender, EventArgs e)
    {
        // Evaluate and toggle the InterceptArrowKeys property.
        if (numericUpDown1.get_InterceptArrowKeys()) {
            numericUpDown1.set_InterceptArrowKeys(false);
        }
        else {
            numericUpDown1.set_InterceptArrowKeys(true);
        }
    } //checkBox2_Click

    private void checkBox3_Click(Object sender, EventArgs e)
    {
        // Evaluate and toggle the UpDownAlign property.
        if (numericUpDown1.get_UpDownAlign().Equals(LeftRightAlignment.Left)) {
            numericUpDown1.set_UpDownAlign(LeftRightAlignment.Right);
        }
        else {
            numericUpDown1.set_UpDownAlign(LeftRightAlignment.Left );
        }
    } //checkBox3_Click
} //Form1 

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

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