不调用UserControl的子类的Resize事件

Question

我正在尝试在C＃中设计一个用户界面，我的一个子课程的事件遇到了一些问题。

基本上，我有一个类（＆＃34; WidgetWindow＆＃34;）继承自Form，并且在方案中，是主表单的 mdiChild 。

接下来，我已经定义了一个＆＃34; IWidget ＆＃34;继承自UserControl并从中构建实际小部件的基类（它们继承此类）。

我有三种类型的小部件，对于其中两种小部件，每当父级＆＃34; WidgetWindow ＆＃34;时，都会正确调用resize事件。 class被修改，但没有为第三个调用事件，除了Load事件。

您对我如何调查原因有什么建议吗？我对.NET很新，所以我可能做错了。

public partial class WidgetWindow : Form
{
    IWidget ctl;
    private Point desiredLocation;
    private Size desiredSize;

    public WidgetWindow()
    {
        this.SuspendLayout();
        InitializeComponent();

        this.ClientSize = new System.Drawing.Size(284, 262);
        this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
        this.ResumeLayout();
    }
    public WidgetWindow(IWidget ctl, Point location, Size size)
        : this()
    {
        this.desiredLocation = location;
        this.desiredSize = size;

        this.Location = location;
        this.Size = size;
        mainContainer.Size = new Size(this.Size.Width - 10, this.Size.Height - 10);
        mainContainer.Location = new Point(5, 5);                

        if (ctl != null)
        {
            this.ctl = ctl;                
            ctl.Size = new Size(this.Size.Width - 10, this.Size.Height - 10);
            ClientSize = ctl.Size;                
            ctl.Dock = DockStyle.Fill;
            mainContainer.Controls.Add(ctl);
            ctl.refreshMy();
        }            
    }   
}   

public partial class IWidget : UserControl
{
    // TODO Add it in the future
    public virtual event EventHandler<TableDataChangedEventArgs> DataChanged;

    protected TableModel data;
    protected bool initialized = false;

    public IWidget()
    {
        InitializeComponent();
    }


    public virtual void refreshMy()
    {
        ;
    }       
}

public class DigitalReadOut : IWidget
{
    internal System.Windows.Forms.Label lblValue;

    internal System.Windows.Forms.Label lblCaption;

    private int MDID;
    private int SDID;
    private System.ComponentModel.IContainer components;

    private void InitializeComponent()
    {
        this.SuspendLayout();
        // 
        // DigitalReadOut
        // 
        this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
        this.Name = "DigitalReadOut";
        this.ResumeLayout(false);

    }

    public DigitalReadOut(int MDID, int SDID)
    {

        this.MDID = MDID;
        this.SDID = SDID;
    }      

    public override void refreshMy()
    {
        this.lblCaption = new System.Windows.Forms.Label();
        this.lblValue = new System.Windows.Forms.Label();
        //this.SuspendLayout();
        //
        //lblCaption
        //
        this.lblCaption.AutoSize = false;
        this.lblCaption.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
        this.lblCaption.Name = "lblCaption";
        this.lblCaption.TabIndex = 0;
        this.lblCaption.TextAlign = ContentAlignment.MiddleCenter;
        this.lblCaption.ForeColor = Color.GreenYellow;
        this.lblCaption.BackColor = Color.Black;

        //
        //lblValue
        //
        this.lblValue.AutoSize = false;
        this.lblValue.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
        this.lblValue.Name = "lblValue";
        this.lblValue.TextAlign = ContentAlignment.MiddleCenter;
        this.lblValue.TabIndex = 1;
        this.lblValue.Text = "###";
        this.lblValue.BackColor = Color.Black;
        this.lblValue.ForeColor = Color.GreenYellow;

        //
        //DigitalReadOut
        //
        this.Controls.Add(this.lblValue);
        this.Controls.Add(this.lblCaption);            
        this.Name = "DigitalReadOut";

        this.BackColor = System.Drawing.Color.Black;

        Redraw();

    }

    private void Redraw()
    {
        Control c = this;
        Graphics g = c.CreateGraphics();

        //if we are going to do autosizing of a text box font do it here...
        lblValue.Left = 0;
        lblValue.Top = 0;
        lblValue.Height = (int)(0.66 * (float)c.Height);
        lblValue.Width = c.Width - 3;

        this.lblCaption.Left = 0;
        this.lblCaption.Top = lblValue.Bottom;
        //Makes the top of the Caption under the value readout
        this.lblCaption.Width = c.Width - 3;
        this.lblCaption.Height = (int)(0.33 * (float)c.Height - 3);

        if (string.IsNullOrEmpty(lblCaption.Text))
            return;

        StretchTextValue();
        StretchText();

    }

PS：为 IWidget 类添加Resize事件处理程序可以正常工作，对于继承它的其他两个类也是如此。