我有以下代码。如何隐藏AutoEllipsis
,Image
,ImageAlign
,ImageIndex
,ImageKey
,ImageList
和TabIndex
属性?
另外,如何将默认大小设置为50x50px?
public class GradientBox : Label
{
[DefaultValue(false), Browsable(false), EditorBrowsable(EditorBrowsableState.Never), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public override bool AutoSize { get; set; }
[DefaultValue(false), Browsable(false), EditorBrowsable(EditorBrowsableState.Never), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public override string Text { get; set; }
[DefaultValue(false), Browsable(false), EditorBrowsable(EditorBrowsableState.Never), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public override ContentAlignment TextAlign { get; set; }
// NullRef Exception if use { get; set; }
[DefaultValue(false), Browsable(false), EditorBrowsable(EditorBrowsableState.Never), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public override Font Font
{
get { return base.Font; }
set { base.Font = value; }
}
public override BorderStyle BorderStyle
{
get { return BorderStyle.FixedSingle; }
set { base.BorderStyle = value; }
}
protected override void OnPaint(PaintEventArgs e)
{
e.Graphics.FillRectangle(new LinearGradientBrush(new Point(0, 0), new Point(0, this.Height), this.ForeColor, this.BackColor), ClientRectangle);
}
}
答案 0 :(得分:3)
当你继承某些东西时,你的新类需要能够像基本类型(多态的一个方面)那样表现。这意味着它无法提供 less 功能而不是基础。所以没有办法删除这些属性,因为否则它不会是Label
。
你可能想要考虑的是“组合”。
public class GradientBox : Control
{
private Label myLabel;
public GradientBox()
{
myLabel = new Label;
// Set your default values
}
public Font Font
{
get { return myLabel.Font; }
set { myLabel.Font = value; }
}
// repeat to expose just the properties you want.
}