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 Value

Type: System.Boolean
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;
     }
 }
 

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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