[DefaultProperty("Text")]
    [ToolboxData("<{0}:MyTextBox runat=server></{0}:MyTextBox>")]
    public class MyTextBox : TextBox
    {
        protected override void Render(HtmlTextWriter writer)
        {
            if (this.allowPaste == AllowType.不允许)
            {
                base.Attributes.Add("onpaste", "return false");//禁止粘贴
            }
            else
            {
                base.Attributes.Add("onpaste", @"var s=clipboardData.getData('text');   if(!/\D/.test(s))   value=s.replace(/^0*/,'');   return   false;");
            }
            if (this.allowMove == AllowType.不允许)
            {
                base.Attributes.Add("ondragenter", "return false");//禁止拖动
            }
            base.Attributes.Add("onkeyup", "if(value.length>1)value=value.replace(/^0*/,   '');");//开头的0替换为空
            base.Attributes.Add("onfocus", " var e = event.srcElement; var r =e.createTextRange();    r.moveStart('character',e.value.length); r.collapse(true); r.select(); ");
            if (allowPoint == AllowType.不允许)
            {
                base.Attributes.Add("onkeypress", "return event.keyCode>=48&&event.keyCode<=57");//只能输入数字
            }
            else
            {
                base.Attributes.Add("onkeypress", "var index=value.indexOf('.');var len=index+" + this.behindPoint + "; if(index!=-1&&value.length>len){return false;} if((index==-1&&event.keyCode==46)||(event.keyCode>=48&&event.keyCode<=57)){return true;}else{return false;}");//只能输入 数字 和 一次小数点
                base.Attributes.Add("onblur", " var index=value.indexOf('.'); if(index==0)value=value.replace('.',   '0.'); ");//开头的小数点换为 "0."
            }
            if (allowInputMethod == AllowType.不允许)
            {
                base.Style.Add("ime-mode", "disabled");//禁用输入法
            }
            base.Render(writer);
        }

        private AllowType allowPaste = AllowType.不允许;
        [Description("是否允许粘贴,默认不允许"), Category("可选属性")]
        public AllowType AllowPaste
        {
            get { return allowPaste; }
            set { allowPaste = value; }
        }

        private AllowType allowMove = AllowType.不允许;
        [Description("是否允许拖动,默认不允许"), Category("可选属性")]
        public AllowType AllowMove
        {
            get { return allowMove; }
            set { allowMove = value; }
        }

        private AllowType allowPoint = AllowType.不允许;
        [Description("是否允许输入小数点,默认不允许"), Category("可选属性")]
        public AllowType AllowPoint
        {
            get { return allowPoint; }
            set { allowPoint = value; }
        }

        private int behindPoint = 2;
        [Description("小数点之后保留多少位，在允许小数点的情况下可用，默认 2位"), Category("可选属性")]
        public int BehindPoint
        {
            get { return behindPoint; }
            set { behindPoint = value; }
        }

        private AllowType allowInputMethod = AllowType.不允许;
        [Description("是否允许切换为其它输入法,默认不允许"), Category("可选属性")]
        public AllowType AllowInputMethod
        {
            get { return allowInputMethod; }
            set { allowInputMethod = value; }
        }

    }

    public enum AllowType
    {
        允许,
        不允许,
    }