ToolStripItem.BackColor 属性

定义

获取或设置项的背景色。Gets or sets the background color for the item.

public:
 virtual property System::Drawing::Color BackColor { System::Drawing::Color get(); void set(System::Drawing::Color value); };
public virtual System.Drawing.Color BackColor { get; set; }
member this.BackColor : System.Drawing.Color with get, set
Public Overridable Property BackColor As Color

属性值

Color,表示该项的背景色。A Color that represents the background color of the item. 默认为 DefaultBackColor 属性的值。The default is the value of the DefaultBackColor property.

示例

下面的代码示例演示如何使用自定义呈现的 BackColor 属性。The following code example demonstrates how to use the BackColor property for custom rendering. 此代码示例是为 ToolStripItem 类提供的更大示例的一部分。This code example is part of a larger example provided for the ToolStripItem class.

protected override void OnRenderItemImage(
    ToolStripItemImageRenderEventArgs e)
{
    base.OnRenderItemImage(e);

    RolloverItem item = e.Item as RolloverItem;

    // If the ToolSTripItem is of type RolloverItem, 
    // perform custom rendering for the image.
    if (item != null)
    {
        if (item.Clicked)
        {
            // The item is in the clicked state, so 
            // draw the image as usual.
            e.Graphics.DrawImage(
                e.Image,
                e.ImageRectangle.X,
                e.ImageRectangle.Y);
        }
        else
        {
            // In the unclicked state, gray out the image.
            ControlPaint.DrawImageDisabled(
                e.Graphics,
                e.Image,
                e.ImageRectangle.X,
                e.ImageRectangle.Y,
                item.BackColor);
        }
    }
}
Protected Overrides Sub OnRenderItemImage(ByVal e As ToolStripItemImageRenderEventArgs)
    MyBase.OnRenderItemImage(e)

    Dim item As RolloverItem = CType(e.Item, RolloverItem)

    ' If the ToolSTripItem is of type RolloverItem, 
    ' perform custom rendering for the image.
    If (item IsNot Nothing) Then
        If item.Clicked Then
            ' The item is in the clicked state, so 
            ' draw the image as usual.
            e.Graphics.DrawImage(e.Image, e.ImageRectangle.X, e.ImageRectangle.Y)
        Else
            ' In the unclicked state, gray out the image.
            ControlPaint.DrawImageDisabled(e.Graphics, e.Image, e.ImageRectangle.X, e.ImageRectangle.Y, item.BackColor)
        End If
    End If
End Sub

注解

除非 System.Windows.Forms.ControlStylesSupportsTransparentBackColor 值设置为 true,否则 BackColor 属性不支持透明颜色。The BackColor property does not support transparent colors unless the SupportsTransparentBackColor value of System.Windows.Forms.ControlStyles is set to true.

BackColor 属性是环境属性。The BackColor property is an ambient property. 环境属性是一个控件属性,如果未设置,则将从父控件中检索该属性。An ambient property is a control property that, if not set, is retrieved from the parent control. 例如,默认情况下,Button 具有与其父 Form 相同的 BackColorFor example, a Button has the same BackColor as its parent Form by default. 有关环境属性的详细信息,请参阅 AmbientProperties 类或 Control 类概述。For more information about ambient properties, see the AmbientProperties class or the Control class overview.

继承者说明

在派生类中重写 BackColor 属性时,请使用基类的 BackColor 属性来扩展基实现。When overriding the BackColor property in a derived class, use the base class's BackColor property to extend the base implementation. 否则,必须提供所有实现。Otherwise, you must provide all the implementation. 不需要重写 BackColor 属性的 getset 访问器;如果需要,只能重写一个。You are not required to override both the get and set accessors of the BackColor property; you can override only one if needed.

适用于