UpDownBase.InterceptArrowKeys 属性
获取或设置一个值,该值指示用户是否可以使用向上键和向下键选择值。
**命名空间:**System.Windows.Forms
**程序集:**System.Windows.Forms(在 system.windows.forms.dll 中)
语法
声明
Public Property InterceptArrowKeys As Boolean
用法
Dim instance As UpDownBase
Dim value As Boolean
value = instance.InterceptArrowKeys
instance.InterceptArrowKeys = value
public bool InterceptArrowKeys { get; set; }
public:
property bool InterceptArrowKeys {
bool get ();
void set (bool value);
}
/** @property */
public boolean get_InterceptArrowKeys ()
/** @property */
public void set_InterceptArrowKeys (boolean value)
public function get InterceptArrowKeys () : boolean
public function set InterceptArrowKeys (value : boolean)
属性值
如果控件允许用户使用向上键和向下键选择值,则为 true;否则为 false。默认值为 true。
备注
如果 InterceptArrowKeys 属性设置为 true,并且数字显示框(也称为 up-down 控件)具有焦点,用户就可以使用向上键和向下键选择值。
示例
下面的代码示例使用派生类 NumericUpDown,并设置它从 UpDownBase 派生的一些属性。此代码要求您在窗体上创建了一个名为 numericUpDown1
的 NumericUpDown 控件;两个分别名为 comboBox1
和 comboBox2
的 ComboBox 控件;和三个分别名为 checkBox1
、checkBox2
和 checkBox2
的 CheckBox 控件。将以下各项添加到 comboBox1
:None
、Fixed3D
和 FixedSingle
。将以下各项添加到 comboBox2
:Left
、Right
和 Center
。
该代码允许您在运行时更改属性值并了解每个值对数字显示框的外观与行为的影响。
Private Sub comboBox1_SelectedIndexChanged(sender As Object, e As EventArgs)
' Set the BorderStyle property.
Select Case comboBox1.Text
Case "Fixed3D"
numericUpDown1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
Case "None"
numericUpDown1.BorderStyle = System.Windows.Forms.BorderStyle.None
Case "FixedSingle"
numericUpDown1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle
End Select
End Sub
Private Sub comboBox2_SelectedIndexChanged(sender As Object, e As EventArgs)
' Set the TextAlign property.
Select Case comboBox2.Text
Case "Right"
numericUpDown1.TextAlign = HorizontalAlignment.Right
Case "Left"
numericUpDown1.TextAlign = HorizontalAlignment.Left
Case "Center"
numericUpDown1.TextAlign = HorizontalAlignment.Center
End Select
End Sub
Private Sub checkBox1_Click(sender As Object, e As EventArgs)
' Evaluate and toggle the ReadOnly property.
If numericUpDown1.ReadOnly Then
numericUpDown1.ReadOnly = False
Else
numericUpDown1.ReadOnly = True
End If
End Sub
Private Sub checkBox2_Click(sender As Object, e As EventArgs)
' Evaluate and toggle the InterceptArrowKeys property.
If numericUpDown1.InterceptArrowKeys Then
numericUpDown1.InterceptArrowKeys = False
Else
numericUpDown1.InterceptArrowKeys = True
End If
End Sub
Private Sub checkBox3_Click(sender As Object, e As EventArgs)
' Evaluate and toggle the UpDownAlign property.
If numericUpDown1.UpDownAlign = LeftRightAlignment.Left Then
numericUpDown1.UpDownAlign = LeftRightAlignment.Right
Else
numericUpDown1.UpDownAlign = LeftRightAlignment.Left
End If
End Sub
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;
}
}
void comboBox1_SelectedIndexChanged( Object^ sender, EventArgs^ e )
{
// Set the BorderStyle property.
if ( !String::Compare( comboBox1->Text, "Fixed3D" ) )
{
numericUpDown1->BorderStyle = System::Windows::Forms::BorderStyle::Fixed3D;
}
else
if ( !String::Compare( comboBox1->Text, "None" ) )
{
numericUpDown1->BorderStyle = System::Windows::Forms::BorderStyle::None;
}
else
if ( !String::Compare( comboBox1->Text, "FixedSingle" ) )
{
numericUpDown1->BorderStyle = System::Windows::Forms::BorderStyle::FixedSingle;
}
}
void comboBox2_SelectedIndexChanged( Object^ sender, EventArgs^ e )
{
// Set the TextAlign property.
if ( !String::Compare( comboBox2->Text, "Right" ) )
{
numericUpDown1->TextAlign = HorizontalAlignment::Right;
}
else
if ( !String::Compare( comboBox1->Text, "Left" ) )
{
numericUpDown1->TextAlign = HorizontalAlignment::Left;
}
else
if ( !String::Compare( comboBox1->Text, "Center" ) )
{
numericUpDown1->TextAlign = HorizontalAlignment::Center;
}
}
void checkBox1_Click( Object^ sender, EventArgs^ e )
{
// Evaluate and toggle the ReadOnly property.
if ( numericUpDown1->ReadOnly )
{
numericUpDown1->ReadOnly = false;
}
else
{
numericUpDown1->ReadOnly = true;
}
}
void checkBox2_Click( Object^ sender, EventArgs^ e )
{
// Evaluate and toggle the InterceptArrowKeys property.
if ( numericUpDown1->InterceptArrowKeys )
{
numericUpDown1->InterceptArrowKeys = false;
}
else
{
numericUpDown1->InterceptArrowKeys = true;
}
}
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
平台
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
.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表,请参见系统要求。
版本信息
.NET Framework
受以下版本支持:2.0、1.1、1.0