Label 类
表示标准 Windows 标签。
**命名空间:**System.Windows.Forms
**程序集:**System.Windows.Forms(在 system.windows.forms.dll 中)
语法
声明
<ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch)> _
<ComVisibleAttribute(True)> _
Public Class Label
Inherits Control
用法
Dim instance As Label
[ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch)]
[ComVisibleAttribute(true)]
public class Label : Control
[ClassInterfaceAttribute(ClassInterfaceType::AutoDispatch)]
[ComVisibleAttribute(true)]
public ref class Label : public Control
/** @attribute ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch) */
/** @attribute ComVisibleAttribute(true) */
public class Label extends Control
ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch)
ComVisibleAttribute(true)
public class Label extends Control
备注
Label 控件通常用于提供控件的描述性文字。例如,可使用 Label 为 TextBox 控件添加描述性文字,以便将控件中所需的数据类型通知用户。Label 控件还可用于为 Form 添加描述性文字,以便为用户提供有帮助作用的信息。例如,可将 Label 添加到 Form 的顶部,为用户提供关于如何将数据输入窗体上的控件中的说明。Label 控件还可用于显示有关应用程序状态的运行时信息。例如,可将 Label 控件添加到窗体,以便在处理一列文件时显示每个文件的状态。
Label 参与窗体的 Tab 键顺序,但不接收焦点(Tab 键顺序中的下一个控件接收焦点)。例如,如果 UseMnemonic 属性设置为 true,并且在控件的 Text 属性中指定助记键字符(“and”符 (&) 之后的第一个字符),则当用户按下 Alt+ 助记键时,焦点移动到 Tab 键顺序中的下一个控件。该功能为窗体提供键盘导航。除了显示文本外,Label 控件还可使用 Image 属性显示图像,或使用 ImageIndex 和 ImageList 属性组合显示图像。
提示
通过将 Label 的 BackColor 属性设置为 Color.Transparent,可使该标签成为透明的。使用透明标签时,请只使用当前设备坐标系在容器上绘制,否则就可能无法正确绘制 Label 背景。
示例
下面的代码示例显示如何创建具有三维边框并包含一个图像的 Label 控件。图像是用 ImageList 和 ImageIndex 两种属性显示的。该控件也有一个指定助记键字符的标题。代码示例使用 PreferredHeight 和 PreferredWidth 属性适当调整 Label 控件的大小。此示例要求已创建一个名为 imageList1
的 ImageList,并且它已加载两幅图像。此示例还要求该代码在一个窗体内,该窗体已将 System.Drawing 命名空间添加到其代码中。
Public Sub CreateMyLabel()
' Create an instance of a Label.
Dim label1 As New Label()
' Set the border to a three-dimensional border.
label1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
' Set the ImageList to use for displaying an image.
label1.ImageList = imageList1
' Use the second image in imageList1.
label1.ImageIndex = 1
' Align the image to the top left corner.
label1.ImageAlign = ContentAlignment.TopLeft
' Specify that the text can display mnemonic characters.
label1.UseMnemonic = True
' Set the text of the control and specify a mnemonic character.
label1.Text = "First &Name:"
' Set the size of the control based on the PreferredHeight and PreferredWidth values.
label1.Size = New Size(label1.PreferredWidth, label1.PreferredHeight)
'...Code to add the control to the form...
End Sub
public void CreateMyLabel()
{
// Create an instance of a Label.
Label label1 = new Label();
// Set the border to a three-dimensional border.
label1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
// Set the ImageList to use for displaying an image.
label1.ImageList = imageList1;
// Use the second image in imageList1.
label1.ImageIndex = 1;
// Align the image to the top left corner.
label1.ImageAlign = ContentAlignment.TopLeft;
// Specify that the text can display mnemonic characters.
label1.UseMnemonic = true;
// Set the text of the control and specify a mnemonic character.
label1.Text = "First &Name:";
/* Set the size of the control based on the PreferredHeight and PreferredWidth values. */
label1.Size = new Size (label1.PreferredWidth, label1.PreferredHeight);
//...Code to add the control to the form...
}
public:
void CreateMyLabel()
{
// Create an instance of a Label.
Label^ label1 = gcnew Label;
// Set the border to a three-dimensional border.
label1->BorderStyle = System::Windows::Forms::BorderStyle::Fixed3D;
// Set the ImageList to use for displaying an image.
label1->ImageList = imageList1;
// Use the second image in imageList1.
label1->ImageIndex = 1;
// Align the image to the top left corner.
label1->ImageAlign = ContentAlignment::TopLeft;
// Specify that the text can display mnemonic characters.
label1->UseMnemonic = true;
// Set the text of the control and specify a mnemonic character.
label1->Text = "First &Name:";
/* Set the size of the control based on the PreferredHeight and PreferredWidth values. */
label1->Size = System::Drawing::Size( label1->PreferredWidth, label1->PreferredHeight );
//...Code to add the control to the form...
}
public void CreateMyLabel()
{
// Create an instance of a Label.
Label label1 = new Label();
// Set the border to a three-dimensional border.
label1.set_BorderStyle(System.Windows.Forms.BorderStyle.Fixed3D);
// Set the ImageList to use for displaying an image.
label1.set_ImageList(imageList1);
// Use the second image in imageList1.
label1.set_ImageIndex(1);
// Align the image to the top left corner.
label1.set_ImageAlign(ContentAlignment.TopLeft);
// Specify that the text can display mnemonic characters.
label1.set_UseMnemonic(true);
// Set the text of the control and specify a mnemonic character.
label1.set_Text("First &Name:");
/* Set the size of the control based on the PreferredHeight
and PreferredWidth values. */
label1.set_Size(new Size(label1.get_PreferredWidth(),
label1.get_PreferredHeight()));
//...Code to add the control to the form...
} //CreateMyLabel
public function CreateMyLabel()
{
// Create an instance of a Label.
var label1 : Label = new Label();
// Set the border to a three-dimensional border.
label1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
// Set the ImageList to use for displaying an image.
label1.ImageList = imageList1;
// Use the second image in imageList1.
label1.ImageIndex = 1;
// Align the image to the top left corner.
label1.ImageAlign = ContentAlignment.TopLeft;
// Specify that the text can display mnemonic characters.
label1.UseMnemonic = true;
// Set the text of the control and specify a mnemonic character.
label1.Text = "First &Name:";
/* Set the size of the control based on the PreferredHeight and PreferredWidth values. */
label1.Size = new System.Drawing.Size (label1.PreferredWidth, label1.PreferredHeight);
//...Code to add the control to the form...
}
继承层次结构
System.Object
System.MarshalByRefObject
System.ComponentModel.Component
System.Windows.Forms.Control
System.Windows.Forms.Label
System.Windows.Forms.LinkLabel
线程安全
此类型的任何公共静态(Visual Basic 中的 Shared)成员都是线程安全的,但不保证所有实例成员都是线程安全的。
平台
Windows 98、Windows 2000 SP4、Windows CE、Windows Millennium Edition、Windows Mobile for Pocket PC、Windows Mobile for Smartphone、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
.NET Compact Framework
受以下版本支持:2.0、1.0