日期:2014-05-18  浏览次数:21328 次

【求解】连续输入几十次错误的数据后提示“未知的错误”,再输入正确数据的都显示“未知的错误”
C# code
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.OleDb;
using System.Data.SqlClient;



namespace WindowsFormsApplication1
{
    public partial class IMEI查找工具 : Form
    {
        public IMEI查找工具()
        {
            InitializeComponent();
        }


        
        private const int WM_LBUTTONDOWN = 0x201;
        private const int WM_LBUTTONUP = 0x202;

        private void TextEnable(bool a_Enable)
        {
            textBox1.Enabled = a_Enable;
            if (a_Enable)
            {
                textBox1.Focus();
                textBox1.SelectAll();
                textBox1.Text = "";
               

            }
        }
        private void label1_Click(object sender, EventArgs e)
        {

        }
        

        private void button1_Click(object sender, EventArgs e)
        {

            try
            {
               
                string strpath;
                strpath = textBox2.Text;


                OleDbConnection myConn = new OleDbConnection();
                myConn.ConnectionString = " Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source =" + strpath;

                

                myConn.Open();
                label3.Text = "表" + strpath + "连接成功!";
                label3.BackColor = Color.LawnGreen;

                textBox2.Enabled = false;

               
            }
            catch (Exception ex)
            {
               
                label3.Text = ( ex.Message + "\n      FAIL");
                label3.BackColor = Color.Red;
            }
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void textBox1_KeyPress(object sender, KeyPressEventArgs ex)
        {
            if (ex.KeyChar == 13)
            {
               
                this.button2_Click(sender, ex);
                
            }
           
        }



        private void button2_Click(object sender, EventArgs e)
        {
            
            try
            {
                string a;
                string strsql;
                string IMEI;

               
                a = textBox1.Text;
                int count;


              

                string strpath;
                strpath = textBox2.Text;
                OleDbConnection myConn = new OleDbConnection();
                myConn.ConnectionString = " Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source =" + strpath;
                
                myConn.Open();


                strsql = "select * from ZTE_MBC_BARCODE_IMEI where IMEI='" + a + "'";
                OleDbCommand mycmd = myConn.CreateCommand();
                mycmd.CommandText = strsql;
                OleDbDataReader mydr = mycmd.ExecuteReader();
                mydr.Read();
                
                count = 0;


               
                while (count == 0)
                {
                    count += 1;
                    IMEI = mydr["IMEI"].ToString();

                    
                        label2.Text = "IMEI号:" + IMEI + ",\n            PASS";
                        label2.BackColor = Color.LawnGreen;
                        
                 
                    break;

                }

               
                TextEnable(true);
                textBox2.Enabled = false;

                myConn.Close();

            }
            catch (Exception ex)
            {
               
                label2.Text=("IMEI:" + textBox1.Text +","+"\n"+ ex.Message+"\n      FAIL");