C＃中的UserControl TextBox验证

Question

我有一个TextBox UserControl。我为MaximumLength的Textbox创建了一个动态属性。

public int MaximumLength { get; set; }

    private void txtLocl_KeyPress(object sender, KeyPressEventArgs e)
    {
        txtLocl.MaxLength = MaximumLength;//txtLocl is a Usercontrol Textbox..,
        //txtLocl maxLength should be given by the user in WindowsForm
        //that should be come to here...,
    }

我向您展示Windows窗体中UserControl属性的图像

现在我想验证用户何时更改该属性中的值...，

Answer 1

实现一个自定义setter，检查该值是否有效。

public int MaximumLength
{
  get
  {
    return this.maximumLength;
  }

  set
  {
    if(value <= 4)
    {
      MessageBox.Show("Value is too small.");
    }
    else this.maximumLength = value;
  }
}

编辑：所以实现一个getter。