MaskedTextBox继承自定义EventHandler

Question

I have built a Custom MaskedTextBox , changing the values of BeepOnError and AsciiOnly , as well as adding a customer EventHandler for MaskInputRejected .
I build the class and when I drop it on my Form, the custom properties I added to the Custom class appear, but the changes to the BeepOnError and AsciiOnly do not, nor does the custom EventHandler fire.

Can someone point out what I did wrong? The EventHandler works fine if I manually add it to the form.

Custom class;

public partial class BaseMaskedTextBox : MaskedTextBox
{
    public string gsOrigValue { get; set; }
    public string gsReadOnlyMode { get; set; }
    public bool gbIsString { get; set; }
...
    private void BaseMaskedTextBox_MaskInputRejected(Object sender, MaskInputRejectedEventArgs e)
    {
        System.Text.StringBuilder messageBoxCS = new System.Text.StringBuilder();
        messageBoxCS.AppendFormat("{0} = {1}", "Character Position", e.Position);
        messageBoxCS.AppendLine();
        messageBoxCS.AppendFormat("{0} = {1}", "Reason Rejected", e.RejectionHint);
        messageBoxCS.AppendLine();
        MessageBox.Show(messageBoxCS.ToString(), "Input Mask Invalid...");
    }

In InitializeComponent( ):

this.BaseMaskedTextBox1.AsciiOnly = <b>true</b>;
this.BaseMaskedTextBox1.BeepOnError = <b>true</b>;
this.BaseMaskedTextBox1.Font = new System.Drawing.Font("Microsoft Sans Serif", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.BaseMaskedTextBox1.Location = new System.Drawing.Point(0, 0);
this.BaseMaskedTextBox1.Name = "BaseMaskedTextBox1";
this.BaseMaskedTextBox1.Size = new System.Drawing.Size(100, 21);
this.BaseMaskedTextBox1.TabIndex = 0;
this.BaseMaskedTextBox1.MaskInputRejected += new System.Windows.Forms.MaskInputRejectedEventHandler(this.BaseMaskedTextBox_MaskInputRejected);
this.ResumeLayout(false);

Answer 1

I just tried this as a custom component and dragged - dropped CustomTextBox on the FORM. It does set it correctly as true . I checked in the Designer. Also, add the event handler after you drag and drop. It works. See the code below.

public partial class CustomTextBox : MaskedTextBox
{
    public CustomTextBox()
    {
        InitializeComponent();

        this.BeepOnError = true;
        this.AsciiOnly = true;
        this.MaskInputRejected += new MaskInputRejectedEventHandler(CustomTextBox_MaskInputRejected);
    }
    /// <summary>
    /// Alas this event is not virtual in the base MS class like other events. Hence,
    /// we have to mark it as virtual now
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
   public virtual void CustomTextBox_MaskInputRejected(object sender, MaskInputRejectedEventArgs e)
    {
        System.Text.StringBuilder messageBoxCS = new System.Text.StringBuilder();
        messageBoxCS.AppendFormat("{0} = {1}", "Character Position", e.Position);
        messageBoxCS.AppendLine();
        messageBoxCS.AppendFormat("{0} = {1}", "Reason Rejected", e.RejectionHint);
        messageBoxCS.AppendLine();
        MessageBox.Show(messageBoxCS.ToString(), "Input Mask Invalid...");
    }

}

// Derive a class like this and override the event where you delegate the request to the base class

 public class MyMaskedBox : CustomTextBox
    {
        public override void CustomTextBox_MaskInputRejected(object sender, MaskInputRejectedEventArgs e)
        {
            base.CustomTextBox_MaskInputRejected(sender, e);
        }
    }

On the Form, now Drag and Drop MyMaskedBox , add a Mask say Numeric (5-Digits) & try entering characters. The base class handler ie of CustomTextBox will be called and you will see the MessageBox added in the base class.

This will solve your issue and you will achieve the desired functionality now.