如何属性的扩展类添加到文本框

问题描述：

我已经创建了一个文本框扩展类如下：

I've created an extension class for Textbox as follows:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ComponentModel;
using System.Text;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace MyApplication.App_Code 
{
    public class DateTextBox : TextBox
    {
        protected override void OnPreRender(EventArgs e)
        {
           //this is what iwant to do :
           //((TextBox)sender).Attributes.Add("placeholder", "dd/mm/yyyy");
           base.OnPreRender(e);
        }
    }
}

我需要的属性添加一个占位符在prerender TextBox控件，但我不知道如何引用发送文本框控件。

I need to add a "placeholder" attribute to the textbox control on prerender, but i'm not sure about how to reference the sender textbox control.

答

目前的情况是你的文本框。使用 this.Attributes ？

The current instance is your textbox. Use this.Attributes?

    protected override void OnPreRender(EventArgs e)
    {
        base.OnPreRender(e);
        this.Attributes.Add("placeholder", "dd/mm/yyyy");
    }

如何属性的扩展类添加到文本框

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