/// <summary>

        /// 限定输入框只能输入数字, TextBox的TextChanged事件调用

        /// </summary>

        /// <param name="e">控件对象</param>

        /// <param name="strText">空间中原有的文本</param>

        /// <param name="isNegative">是否允许负数</param>

        /// <param name="isDecimal">是否允许小数</param>

        public void inputLimitNumber(ref object sender, string strNumType = "int")

        {

            try

            {

                Int64 isNum = ;

                TextBox txt = (TextBox)sender;

                string strText = txt.Text = txt.Text.Trim();

                int focusIndex = txt.SelectionStart;

                if (!Int64.TryParse(strText, out isNum))

                {

                    for (int i = strText.Length - ; i >= ; i--)

                    {

                        if (!Int64.TryParse(strText.Substring(i, ), out isNum))

                        {

                            strText = strText.Remove(i, );

                            focusIndex -= ;

                        }

                    }

                }

                txt.Text = strText;

                if (focusIndex < )

                {

                    focusIndex = ;

                }

                txt.Select(focusIndex, );

            }

            catch (Exception ex)

            {

                MessageBox.Show(ex.Message, "错误信息", MessageBoxButtons.OK, MessageBoxIcon.Error);

            }

        }