通过

ToolStripItem.ImageKey 属性

  • 参考

定义

命名空间:
System.Windows.Forms
程序集:
System.Windows.Forms.dll

获取或设置显示在 ImageList 上的 ToolStripItem 中图像的键访问器。

public:
 property System::String ^ ImageKey { System::String ^ get(); void set(System::String ^ value); };
[System.ComponentModel.Browsable(false)]
[System.ComponentModel.TypeConverter(typeof(System.Windows.Forms.ImageKeyConverter))]
[System.Windows.Forms.RelatedImageList("Owner.ImageList")]
public string ImageKey { get; set; }
[<System.ComponentModel.Browsable(false)>]
[<System.ComponentModel.TypeConverter(typeof(System.Windows.Forms.ImageKeyConverter))>]
[<System.Windows.Forms.RelatedImageList("Owner.ImageList")>]
member this.ImageKey : string with get, set
Public Property ImageKey As String

属性值

String

一个表示图像的键的字符串。

属性
BrowsableAttribute TypeConverterAttribute RelatedImageListAttribute

示例

下面的代码示例演示如何设置 ImageKey 属性。 此代码示例是为类提供的大型示例的 ToolStripItem 一部分。

// This utility method creates a RolloverItem 
// and adds it to a ToolStrip control.
private RolloverItem CreateRolloverItem(
    ToolStrip owningToolStrip,
    string txt,
    Font f,
    string imgKey,
    TextImageRelation tir,
    string backImgKey)
{
    RolloverItem item = new RolloverItem();

    item.Alignment = ToolStripItemAlignment.Left;
    item.AllowDrop = false;
    item.AutoSize = true;

    item.BackgroundImage = owningToolStrip.ImageList.Images[backImgKey];
    item.BackgroundImageLayout = ImageLayout.Center;
    item.DisplayStyle = ToolStripItemDisplayStyle.ImageAndText;
    item.DoubleClickEnabled = true;
    item.Enabled = true;
    item.Font = f;

    // These assignments are equivalent. Each assigns an
    // image from the owning toolstrip's image list.
    item.ImageKey = imgKey;
    //item.Image = owningToolStrip.ImageList.Images[infoIconKey];
    //item.ImageIndex = owningToolStrip.ImageList.Images.IndexOfKey(infoIconKey);
    item.ImageScaling = ToolStripItemImageScaling.None;

    item.Owner = owningToolStrip;
    item.Padding = new Padding(2);
    item.Text = txt;
    item.TextAlign = ContentAlignment.MiddleLeft;
    item.TextDirection = ToolStripTextDirection.Horizontal;
    item.TextImageRelation = tir;

    return item;
}

' This utility method creates a RolloverItem 
' and adds it to a ToolStrip control.
 Private Function CreateRolloverItem( _
 ByVal owningToolStrip As ToolStrip, _
 ByVal txt As String, _
 ByVal f As Font, _
 ByVal imgKey As String, _
 ByVal tir As TextImageRelation, _
 ByVal backImgKey As String) As RolloverItem

     Dim item As New RolloverItem()

     item.Alignment = ToolStripItemAlignment.Left
     item.AllowDrop = False
     item.AutoSize = True

     item.BackgroundImage = owningToolStrip.ImageList.Images(backImgKey)
     item.BackgroundImageLayout = ImageLayout.Center
     item.DisplayStyle = ToolStripItemDisplayStyle.ImageAndText
     item.DoubleClickEnabled = True
     item.Enabled = True
     item.Font = f

     ' These assignments are equivalent. Each assigns an
     ' image from the owning toolstrip's image list.
     item.ImageKey = imgKey
     'item.Image = owningToolStrip.ImageList.Images[infoIconKey];
     'item.ImageIndex = owningToolStrip.ImageList.Images.IndexOfKey(infoIconKey);
     item.ImageScaling = ToolStripItemImageScaling.None

     item.Owner = owningToolStrip
     item.Padding = New Padding(2)
     item.Text = txt
     item.TextAlign = ContentAlignment.MiddleLeft
     item.TextDirection = ToolStripTextDirection.Horizontal
     item.TextImageRelation = tir

     Return item
 End Function

注解

ImageKey 并且 ImageIndex 是互斥的，这意味着如果设置了一个，另一个设置为无效值并忽略。 如果设置该 ImageKey 属性，该 ImageIndex 属性将自动设置为 -1。 或者，如果设置 ImageIndex 属性，则 ImageKey 会自动将此属性设置为空字符串 (“”) 。

ImageAlign、Image、ImageIndexImageKey和ImageScaling属性与图像处理的各个方面有关。 通过直接设置这些属性或设置仅ImageList运行时属性，在控件中使用ToolStrip图像。

图像缩放由两者ToolStripToolStripItem中的属性交互决定，如下所示：

适用于