输入合法性验证，数字、字母

//只允许输入1-31之间的数字 

           int i_HID = 0;
            if (!int.TryParse(txtGroupHID.Text, out i_HID) || i_HID > 31 || i_HID<=0)
            {
                Bestway.Windows.Controls.MessageBoxEx.Show("输入值错误，请重新输入1-31之间的有效数字！","错误",MessageBoxButtons.OK,MessageBoxIcon.Error  );
                return;
            }

 

//只允许输入数字

        private void txtSum_KeyPress(object sender, KeyPressEventArgs e)
        {
            if ((e.KeyChar != 8 && !char.IsDigit(e.KeyChar))&&e.KeyChar!=13)
            {
                MessageBox.Show("商品数量只能输入数字","操作提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
                e.Handled = true;
            } 
}

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//e.KeyChar   8为back，32为空格，13回车键      

 

//只允许输入数字和字母    

        private void txtGUID_Leave(object sender, EventArgs e)

        {

            if(checkIsLetterOrDigit(txtGUID.Text))

           {

                 CommControls.MessageBoxEx.MessageBoxEx.Show("摄像头GUID只能输入数字和字母", "操作提示", MessageBoxButtons.OK, MessageBoxIcon.Information);

                 txtGUID.Text = "";
                txtGUID.Focus();
               
            }
        }

       private bool checkIsLetterOrDigit(string str)
        {
            bool isError=false;
            foreach (char c in str)
            {
                if (!char.IsLetterOrDigit(c) || ((int)c > 0x4E00 && (int)c < 0x9FA5))       
                {
                    isError = true;
                    break;
                }
            }
            return isError;   
        }

 

 

        public bool IsChinese(char c)
        {

            return (int)c > 0x4E00 && (int)c < 0x9FA5;
        }

 

 

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