SANAS/Core/CustomControl/NewTextBox.cs

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

namespace SmartCoalApplication.Core.CustomControl
{
    public partial class NewTextBox : TextBox
    {
        public NewTextBox()
        {
            this.TextChanged += new EventHandler(textValueChanged);
        }

        private void textValueChanged(object sender, EventArgs e)
        {
            if (this.Text.Contains("|")) 
            {
                MessageBox.Show("'|'為系統使用字符，不可輸入！");
                this.Text =this.Text.Replace("|", string.Empty);
                return;
            }
        }
    }
}