Validatedで値をゼロ埋めするコンポーネント試作

CodePaddingProvider.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
  public partial class CodePaddingProvider : Component
  {
    public CodePaddingProvider()
    {
      InitializeComponent();

      this.Disposed += OnDisposed;
    }

    public CodePaddingProvider(IContainer container)
    {
      container.Add(this);

      InitializeComponent();

      this.Disposed += OnDisposed;
    }

    private Control targetContainer;

    public Control TargetContainer
    {
      get { return this.targetContainer; }
      set
      {
        if (targetContainer == value) return;


        if (targetContainer != null)
        {
          targetContainer.ControlAdded -= OnControlAdded;
        }

        targetContainer = value;

        if (targetContainer != null)
        {
          targetContainer.ControlAdded += OnControlAdded;
        }
      }
    }

    private void OnControlAdded(object sender, ControlEventArgs e)
    {
      var textBox = e.Control as TextBox;
      if (textBox == null) return;

      textBox.Validated -= OnValidated;
      textBox.Validated += OnValidated;
    }

    private void OnValidated(object sender, EventArgs e)
    {
      var textBox = sender as TextBox;
      if (textBox == null) return;

      var current = textBox.Text;

      if (String.IsNullOrEmpty(current)) return;

      var result = current.PadLeft(10, '0');
      textBox.Text = result;
    }

    private void OnDisposed(object sender, EventArgs e)
    {
      this.targetContainer = null;
    }

  }
}