使用自定义 class 属性的 Winforms 控件不刷新

Question

我一直在寻找解决方案，但似乎找不到，尽管我想这可能很简单。
我已经构建了一个自定义控件属性那是一个 Class。 当我更改任何此 class 属性时，我的控件不会自动刷新（无论是在设计器中还是以编程方式）。有什么方法可以强制执行 Invalidate() 方法吗？
我遵循了一些我发现的提示，但 none 似乎有效。
这是一个代码示例来演示我的内容我正在经历。
这是我的自定义类型。

[TypeConverter(typeof(ExpandableObjectConverter))]
public class TextComponent
{
    public TextComponent()
    {
        Text= string.Empty;
        Font = Control.DefaultFont;
        ForeColor = Control.DefaultForeColor;
    }

    [NotifyParentProperty(true)]
    public string Text { get; set; }

    [NotifyParentProperty(true)]
    public Font Font { get; set; }

    [NotifyParentProperty(true)]
    public Color ForeColor { get; set; }
}

这是我的自定义控件：

public partial class myControl : Control
{
    private TextComponent tc = new TextComponent();

    protected override void OnPaint(PaintEventArgs pe)
    {
        pe.Graphics.SmoothingMode = SmoothingMode.AntiAlias;

        GraphicsPath gp = new GraphicsPath();
        Rectangle rect = new Rectangle(1, 1, DisplayRectangle.Width - 3, DisplayRectangle.Height - 3);
        gp.AddRectangle(rect);
        pe.Graphics.FillPath(new SolidBrush(Color.LightCoral), gp);

        using (StringFormat sf = new StringFormat())
        {
            sf.Alignment = StringAlignment.Center;
            sf.LineAlignment = StringAlignment.Center;

            pe.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
            pe.Graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;
            pe.Graphics.DrawString(tc.Text, tc.Font, new SolidBrush(tc.ForeColor), rect, sf);
        }

        base.OnPaint(pe);
    }

    [Description("The Text Component for the Control"), Category("Text"), NotifyParentPropertyAttribute(true), DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
    public TextComponent TextComponent { get { return tc; } }

    public myControl()
    {
        this.DoubleBuffered = true;
        this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
        this.SetStyle(ControlStyles.SupportsTransparentBackColor, true);
        this.SetStyle(ControlStyles.ResizeRedraw, true);
        this.SetStyle(ControlStyles.Selectable, true);
    }

    [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
    public new string Text { get { return string.Empty; } }
}

Answer 1

尝试侦听 PropertyChanged 事件以使其正常工作。您必须将 INotifyPropertyChanged 接口添加到 class 并启动它：

[TypeConverter(typeof(ExpandableObjectConverter))]
public class TextComponent : INotifyPropertyChanged  {

  public event PropertyChangedEventHandler PropertyChanged;

  protected void OnChanged(string propertyName) {
    if (PropertyChanged != null) {
      PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
    }
  }

  private string text = string.Empty;

  [NotifyParentProperty(true)]
  public string Text {
    get { return text; }
    set {
      text = value;
      OnChanged("Text");
    }
  }
}

然后在你的控件class中监听事件并使你的控件失效：

public myControl() {
  this.DoubleBuffered = true;
  this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
  this.SetStyle(ControlStyles.SupportsTransparentBackColor, true);
  this.SetStyle(ControlStyles.ResizeRedraw, true);
  this.SetStyle(ControlStyles.Selectable, true);

  this.TextComponent.PropertyChanged += TextComponent_PropertyChanged;
}

void TextComponent_PropertyChanged(object sender, PropertyChangedEventArgs e) {
  this.Invalidate();
}

使用自定义 class 属性的 Winforms 控件不刷新

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