最近给师兄写了个一个程序，在winform 中利用c# 操作access 数据库，完成数据的增删查改。废话不说直接贴code

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Data.OleDb;
using System.Data.Common;
using System.Windows.Forms;
using System.IO;
using System.Globalization;
using System.Threading;
using System.Runtime.InteropServices;namespace WindowsFormsApplication1
{//public partial class Form1 : BaseFormAutopublic partial class Form1 : Form{private string ConStr;OleDbConnection con;string currentdir = System.Environment.CurrentDirectory;private string ImgPath = System.Environment.CurrentDirectory + "\\tulip.jpg";private string recordID = "";int a = 10;public Form1(){InitializeComponent();//base.GetAllInitInfo(this.Controls[0]);set_default_values();//global variablelistView1.View = View.Details;listView1.Clear();listView1.HeaderStyle = ColumnHeaderStyle.Clickable;listView1.FullRowSelect = true;listView1.GridLines = true;listView1.Columns.Add("ID", 70, HorizontalAlignment.Center);listView1.Columns.Add("ST", 60, HorizontalAlignment.Center);listView1.Columns.Add("INVENTOR", 60, HorizontalAlignment.Center);listView1.Columns.Add("DATE", 80, HorizontalAlignment.Left);listView1.Columns.Add("NUAP", 40, HorizontalAlignment.Center);listView1.Columns.Add("AW1", 60, HorizontalAlignment.Center);listView1.Columns.Add("AW2", 60, HorizontalAlignment.Center);listView1.Columns.Add("AW3", 60, HorizontalAlignment.Center);listView1.Columns.Add("AW4", 60, HorizontalAlignment.Center);listView1.Columns.Add("AW5", 60, HorizontalAlignment.Center);listView1.Columns.Add("AW6", 60, HorizontalAlignment.Center);listView1.Columns.Add("AW7", 60, HorizontalAlignment.Center);listView1.Columns.Add("AW8", 60, HorizontalAlignment.Center);listView1.Columns.Add("API2/1", 60, HorizontalAlignment.Center);listView1.Columns.Add("API3/1", 60, HorizontalAlignment.Center);listView1.Columns.Add("API4/1", 60, HorizontalAlignment.Center);listView1.Columns.Add("API5/1", 60, HorizontalAlignment.Center);listView1.Columns.Add("API6/1", 60, HorizontalAlignment.Center);listView1.Columns.Add("API7/1", 60, HorizontalAlignment.Center);listView1.Columns.Add("API8/1", 60, HorizontalAlignment.Center);listView1.Columns.Add("Other", 60, HorizontalAlignment.Center);listView1.Columns.Add("img", 100, HorizontalAlignment.Center);findTime.ShowCheckBox = true;findTime.Value = DateTime.Now;listView1.Visible = true;//init the database when init the form// init_database();init_database();update_list_view();update_text_rnum();bool createdNew;Mutex m = new Mutex(true, "YourAppName", out createdNew);if (!createdNew){// app is already running…MessageBox.Show("Only one instance of this application is allowed at a time.");return;}}private void Form1_Load(object sender, EventArgs e){}//connect date baseprivate void button1_Click(object sender, EventArgs e){db_open();if (con.State == ConnectionState.Open){//MessageBox.Show("Access数据库的连接成功!", "Access数据库的连接");}else{//MessageBox.Show("Access数据库的连接失败!", "Access数据库的连接");}db_close();update_list_view();set_default_values();}//查询private void button2_Click(object sender, EventArgs e){db_open();string str = text_id.Text;//MessageBox(text_aw1.Text);con.Close();}//退出界面private void button3_Click(object sender, EventArgs e){this.Close();}//insert a record to databaseprivate void button4_Click(object sender, EventArgs e){db_open();//String i = textBox2.Text;check_impty();StringBuilder sb = new StringBuilder();sb = get_sql_exp("INSERT");picBox.Image.Save(System.Environment.CurrentDirectory + "\\temp.png", System.Drawing.Imaging.ImageFormat.Png);ImgPath = System.Environment.CurrentDirectory + "\\temp.png";FileStream fs = new FileStream(ImgPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);try{//FileStream fs = new FileStream(ImgPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);//File.Delete(ImgPath);byte[] imagebytes = new byte[fs.Length];BinaryReader br = new BinaryReader(fs);imagebytes = br.ReadBytes(Convert.ToInt32(fs.Length));//MessageBox.Show(sb.ToString());string sb1 = sb.ToString();OleDbCommand cmd = new OleDbCommand(sb1, con);cmd.Parameters.Add("img", OleDbType.Binary);cmd.Parameters["img"].Value = imagebytes;cmd.ExecuteNonQuery();//fs = null;//System.GC.Collect();//MessageBox.Show("One Record Insert Successfully!!!");//fs.Close();//File.Delete(ImgPath);}catch (Exception ex){MessageBox.Show("Error found  when insert date into datebase!!!\nError:\n" + ex.Message);//fs.Close();//File.Delete(ImgPath);}fs.Close();File.Delete(ImgPath);db_close();update_list_view();update_text_rnum();}//delete all record in UVADB//private void button5_Click(object sender, EventArgs e)//{//    var result = MessageBox.Show("Are you sure to delete all records?", "Warning", MessageBoxButtons.OKCancel, MessageBoxIcon.Warning);//    if (result == DialogResult.OK)//    {//        db_open();//        StringBuilder sql = new StringBuilder();//        sql.Append("delete * from UVADB");//        OleDbCommand cmd = new OleDbCommand(sql.ToString(), con);//        try//        {//            cmd.ExecuteNonQuery();//        }//        catch (Exception ex)//        {//            MessageBox.Show(ex.Message);//        }//        db_close();//        update_list_view();//    }//}//测试private void button6_Click(object sender, EventArgs e){}//STprivate void textBox1_TextChanged(object sender, EventArgs e){}//IDprivate void textBox2_TextChanged(object sender, EventArgs e){string str = text_nuap.Text;int b = str.IndexOf("-");bool abc = Convert.ToBoolean(str.IndexOf("-"));if (str != "" && !(str.IndexOf("-") > 0)){checkNumber(str);try{int a = Convert.ToInt16(str.ToString());if (a < 0 || a > 8){MessageBox.Show("Please input a number beteen 1 and 8!!!");}else{}}catch (Exception re){MessageBox.Show(re.Message);}}}private void label22_Click(object sender, EventArgs e){}//init date baseprivate void init_datebase(){db_open();if (con.State == ConnectionState.Open){//MessageBox.Show("Access数据库的连接成功!", "Access数据库的连接");}else{MessageBox.Show("Access数据库的连接失败!", "Access数据库的连接");}db_close();}//open the datebase connectionprivate void db_open(){ConStr = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=data.accdb;Jet OLEDB:Database Password=admin;"; //创建OleDbConnection对象 con = new OleDbConnection(ConStr);try{con.Open();}catch (Exception re){MessageBox.Show("Database file open failed!!!" + re.Message);}}//close the datebase connectionprivate void db_close(){con.Close();}private void button2_Click_1(object sender, EventArgs e){}private void dateTimePicker1_ValueChanged(object sender, EventArgs e){findTime.Format = DateTimePickerFormat.Custom;findTime.CustomFormat = "yyyy/MM/dd";string dt = findTime.Value.ToShortDateString();//MessageBox.Show(dt.ToString());}//verify whether the content of string is a numberprivate void checkNumber(string text){if (text != ""){try{Convert.ToInt64(text);}catch{MessageBox.Show("Please input a number!!!");return;}}}private void text_id_TextChanged_1(object sender, EventArgs e){string str = text_id.Text;checkNumber(str);if (str.Length <= 10){}else{MessageBox.Show("Please input a right number less than 10");}}private void text_id_KeyPress(object sender, KeyPressEventArgs e){if (e.KeyChar == 13){string str = text_id.Text;checkNumber(str);if (str.Length == 9){}else{MessageBox.Show("Please input a right number");}}else{}}//open the image in butten above the imageboxprivate void button2_Click_2(object sender, EventArgs e){OpenFileDialog ofd = new OpenFileDialog();ofd.InitialDirectory = "C:\\Users\\Public\\Pictures\\Sample Pictures";ofd.Filter = "所有图片文件|*.*|JPEG(*JPG)|*.jpg|位图文件(*BMP)|*.BMP";ofd.RestoreDirectory = true;ofd.FilterIndex = 1;String fName;if (ofd.ShowDialog() == DialogResult.OK){fName = ofd.FileName;Image myImage = Image.FromFile(fName, true);picBox.SizeMode = PictureBoxSizeMode.StretchImage;picBox.Image = myImage;ImgPath = ofd.FileName;// MessageBox.Show(ImgPath);}}//get the value from the textboxprivate void get_textbox_value(){}//set the default valuesprivate void set_default_values(){text_id.Text = DateTime.Now.ToString("yyyyMMdd")+"00" ;text_st.Text = "ZWM";text_inventor.Text = "Tang";text_nuap.Text = "1";findTime.Value = DateTime.Now;text_aw1.Text = "0";text_aw2.Text = "0";text_aw3.Text = "0";text_aw4.Text = "0";text_aw5.Text = "0";text_aw6.Text = "0";text_aw7.Text = "0";text_aw8.Text = "0";text_api21.Text = "0";text_api31.Text = "0";text_api41.Text = "0";text_api51.Text = "0";text_api61.Text = "0";text_api71.Text = "0";text_api81.Text = "0";text_other.Text = "OUCMDZ";//Image myImage = Image.FromFile(ImgPath, true);ImgPath = System.Environment.CurrentDirectory + "\\tulip.jpg";picBox.SizeMode = PictureBoxSizeMode.StretchImage;picBox.Image = Image.FromFile(ImgPath, true);}//to set sql expression in one functionprivate StringBuilder get_sql_exp(string exp){StringBuilder sb = new StringBuilder();switch (exp){case "CREATE":sb.Append("CREATE TABLE UVADB (ID  varchar(10),ST text(20),INVENTER varchar(20)," +"FindTime date,NUAP integer,AW1 Single,AW2 Single,AW3 Single," +"AW4 Single,AW5 Single,AW6 Single,AW7 Single,AW8 Single," +"API21 Single,API31 Single,API41 Single,API51 Single,API61 Single," +"API71 Single,API81 Single,Other text(128),img OleObject)");//return sb;break;case "INSERT":sb.Append("insert into  UVADB(ID,ST,INVENTER,FindTime,NUAP,AW1,AW2,AW3,AW4,AW5,AW6,AW7,AW8,API21,API31,API41,API51,API61,API71,API81,Other,img) values(\"");sb.Append(text_id.Text + "\",\"");sb.Append(text_st.Text + "\",\"");sb.Append(text_inventor.Text + "\",format('");if (findTime.Checked == true){sb.Append(findTime.Value.ToShortDateString() + "','yyyy/mm/dd'),");}else{sb.Append(findTime.MinDate.ToString() + "','yyyy/mm/dd'),");}sb.Append(text_nuap.Text + ",");sb.Append(text_aw1.Text + ",");sb.Append(text_aw2.Text + ",");sb.Append(text_aw3.Text + ",");sb.Append(text_aw4.Text + ",");sb.Append(text_aw5.Text + ",");sb.Append(text_aw6.Text + ",");sb.Append(text_aw7.Text + ",");sb.Append(text_aw8.Text + ",");sb.Append(text_api21.Text + ",");sb.Append(text_api31.Text + ",");sb.Append(text_api41.Text + ",");sb.Append(text_api51.Text + ",");sb.Append(text_api61.Text + ",");sb.Append(text_api71.Text + ",");sb.Append(text_api81.Text + ",\"");// sb.Append(text_other.Text + "\")");sb.Append(text_other.Text + "\",");sb.Append("@img)");break;case "UPDATE":sb.Append("UPDATE UVADB SET ");//sb.Append(text_id.Text + "\",\"");sb.Append("ID=\""+text_id.Text+"\",");sb.Append("ST = \"" + text_st.Text + "\",");sb.Append("INVENTER = \"" + text_inventor.Text + "\",");if (findTime.Checked == true){sb.Append("FindTime = format('" + findTime.Value.ToShortDateString() + "','yyyy/mm/dd'),");}else{sb.Append("FindTime = format('" + findTime.MinDate.ToShortDateString() + "','yyyy/mm/dd'),");}sb.Append("NUAP = " + text_nuap.Text + ",");sb.Append("AW1 = " + text_aw1.Text + ",");sb.Append("AW2 = " + text_aw2.Text + ",");sb.Append("AW3 = " + text_aw3.Text + ",");sb.Append("AW4 = " + text_aw4.Text + ",");sb.Append("AW5 = " + text_aw5.Text + ",");sb.Append("AW6 = " + text_aw6.Text + ",");sb.Append("AW7 = " + text_aw7.Text + ",");sb.Append("AW8 = " + text_aw8.Text + ",");sb.Append("API21 = " + text_api21.Text + ",");sb.Append("API31 = " + text_api31.Text + ",");sb.Append("API41 = " + text_api41.Text + ",");sb.Append("API51 = " + text_api51.Text + ",");sb.Append("API61 = " + text_api61.Text + ",");sb.Append("API71 = " + text_api71.Text + ",");sb.Append("API81 = " + text_api81.Text + ",");// sb.Append(text_other.Text + "\")");sb.Append("Other = \"" + text_other.Text + "\", ");sb.Append("img =@img");// sb.Append("@img),");sb.Append(" WHERE ID = \"" + recordID + "\"");break;default:break;}return sb;}// update the listviewprivate void update_list_view(){db_open();StringBuilder sb = new StringBuilder();sb.Append("select *  from UVADB");OleDbCommand cmd = new OleDbCommand(sb.ToString(), con);OleDbDataReader dbreader = cmd.ExecuteReader();listView1.Items.Clear();while (dbreader.Read()){ListViewItem Item = new ListViewItem();Item.SubItems.Clear();Item.SubItems[0].Text = dbreader.GetValue(0).ToString();//读取数据库中字段 for (int i = 1; i < dbreader.FieldCount; i++){string value = dbreader.GetValue(i).ToString();string valueresult = "";if (i == 3){valueresult = value.Substring(0, value.Length - 7);}else{valueresult = value;}Item.SubItems.Add(valueresult);//显示}listView1.Items.AddRange(new ListViewItem[] { Item });}//int a = dbreader.Depth;//listView1.Items[a].EnsureVisible();db_close();set_listview_selected();}//init the databaseprivate void init_database(){string cur_path = System.Environment.CurrentDirectory;//string df_path = System.Environment.CurrentDirectory + "\\default.accdb";string sourceFile = System.IO.Path.Combine(cur_path, "default.accdb");string targetFile = System.IO.Path.Combine(cur_path, "data.accdb");if (!System.IO.File.Exists(targetFile)){System.IO.File.Delete(db_path);//CopyDir(df_path, db_path);try{System.IO.File.Copy(sourceFile, targetFile);}catch (Exception re){}}ConStr = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=data.accdb;Jet OLEDB:Database Password=admin;"; //创建OleDbConnection对象 con = new OleDbConnection(ConStr);try{con.Open();}catch (Exception re){MessageBox.Show("Database file open failed!!!" + re.Message);}string sb = "select * from UVADB";string uniq = "alter table UVADB add unique (ID)";OleDbCommand cmd = new OleDbCommand(sb, con);try{cmd.ExecuteNonQuery();}catch{StringBuilder sb1 = get_sql_exp("CREATE");OleDbCommand cmd1 = new OleDbCommand(sb1.ToString(), con);OleDbCommand cmd2 = new OleDbCommand(uniq, con);cmd1.ExecuteNonQuery();cmd2.ExecuteNonQuery();}con.Close();}private void listView1_MouseClick(object sender, MouseEventArgs e){//MessageBox.Show("hello world");}//send message shen click delete buttonprivate void button_delete_Click(object sender, EventArgs e){db_open();//MessageBox.Show(listView1.FocusedItem.SubItems[0].Text);string id = text_id.Text;string sb = "delete *  from UVADB  where ID= \"" + id + "\"";OleDbCommand cmd = new OleDbCommand(sb, con);try{cmd.ExecuteNonQuery();}catch (Exception re){MessageBox.Show("Delete record from dataBase failed!!!\nError:\n" + re.Message);}db_close();update_list_view();update_text_rnum();}//send message when the focus changed in listboxprivate void listBox1_SelectedIndexChanged(object sender, EventArgs e){if (listView1.FocusedItem != null && listView1.SelectedIndices.Count > 0){db_open();//MessageBox.Show(listView1.FocusedItem.SubItems[0].Text);string id = listView1.FocusedItem.SubItems[0].Text;string sb = "select *  from UVADB  where ID= \"" + id + "\"";OleDbCommand cmd = new OleDbCommand(sb, con);OleDbDataReader dbreader = cmd.ExecuteReader();if (dbreader.Read()){//convert and update the findtimeDateTime dt;DateTimeFormatInfo dtFormat = new System.Globalization.DateTimeFormatInfo();dtFormat.ShortDatePattern = "yyyy/mm/dd";dt = Convert.ToDateTime(dbreader.GetValue(3).ToString(), dtFormat);findTime.Value = dt;//update the others parameterstext_id.Text = dbreader.GetValue(0).ToString();recordID = dbreader.GetValue(0).ToString();text_st.Text = dbreader.GetValue(1).ToString();text_inventor.Text = dbreader.GetValue(2).ToString();text_nuap.Text = dbreader.GetValue(4).ToString();text_aw1.Text = dbreader.GetValue(5).ToString();text_aw2.Text = dbreader.GetValue(6).ToString();text_aw3.Text = dbreader.GetValue(7).ToString();text_aw4.Text = dbreader.GetValue(8).ToString();text_aw5.Text = dbreader.GetValue(9).ToString();text_aw6.Text = dbreader.GetValue(10).ToString();text_aw7.Text = dbreader.GetValue(11).ToString();text_aw8.Text = dbreader.GetValue(12).ToString();text_api21.Text = dbreader.GetValue(13).ToString();text_api31.Text = dbreader.GetValue(14).ToString();text_api41.Text = dbreader.GetValue(15).ToString();text_api51.Text = dbreader.GetValue(16).ToString();text_api61.Text = dbreader.GetValue(17).ToString();text_api71.Text = dbreader.GetValue(18).ToString();text_api81.Text = dbreader.GetValue(19).ToString();text_other.Text = dbreader.GetValue(20).ToString();Byte[] bytedata = new Byte[0];bytedata = (byte[])(dbreader.GetValue(21));MemoryStream strdata = new MemoryStream(bytedata);picBox.Image = Image.FromStream(strdata);}db_close();}}//update the record in databaseprivate void button_update_Click(object sender, EventArgs e){db_open();//String i = textBox2.Text;StringBuilder sb = new StringBuilder();sb = get_sql_exp("UPDATE");try{picBox.Image.Save(System.Environment.CurrentDirectory + "\\temp.png", System.Drawing.Imaging.ImageFormat.Png);ImgPath = System.Environment.CurrentDirectory + "\\temp.png";FileStream fs = new FileStream(ImgPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);//File.Delete(ImgPath);byte[] imagebytes = new byte[fs.Length];BinaryReader br = new BinaryReader(fs);imagebytes = br.ReadBytes(Convert.ToInt32(fs.Length));//MessageBox.Show(sb.ToString());string sb1 = sb.ToString();OleDbCommand cmd = new OleDbCommand(sb1, con);cmd.Parameters.Add("img", OleDbType.Binary);cmd.Parameters["img"].Value = imagebytes;cmd.ExecuteNonQuery();fs.Close();File.Delete(ImgPath);//    //fs = null;//    //System.GC.Collect();//    //MessageBox.Show("One Record Insert Successfully!!!");}catch (Exception ex){MessageBox.Show("Error fired  when update datebase!!!\nError:\n" + ex.Message);}db_close();update_list_view();}//search in databaseprivate void button_search_Click(object sender, EventArgs e){//test_to_sql("NUAP", "3-5");db_open();string sb = "select *  from UVADB where ";string[] keys = new string[] { "ID", "ST", "INVENTER", "NUAP", "AW1", "AW2", "AW3", "AW4", "AW5", "AW6", "AW7", "AW8", "API21", "API31", "API41", "API51", "API61", "API71", "API81", "Other" };string[] txts = new string[] { text_id.Text, text_st.Text, text_inventor.Text, text_nuap.Text, text_aw1.Text, text_aw2.Text, text_aw3.Text, text_aw4.Text, text_aw5.Text, text_aw6.Text, text_aw7.Text, text_aw8.Text, text_api21.Text, text_api31.Text, text_api41.Text, text_api51.Text, text_api61.Text, text_api71.Text, text_api81.Text, text_other.Text };for (int i = 0; i < keys.Length; i++){string sqlres = text_to_sql(keys[i], txts[i]);if (sqlres != "" && sqlres != "ERROR"){sb = sb + sqlres + " and ";}else if (sqlres == "ERROR"){break;}else{continue;}}if (sb == "select *  from UVADB where "){if (text_to_sql("FindTime", findTime.Value.ToShortDateString()) == ""){sb = "select * from UVADB";MessageBox.Show("Will search all records in database when all value are empty!!!");}else{sb = sb + text_to_sql("FindTime", findTime.Value.ToShortDateString());}}else{//sb = sb.Substring(0, sb.Length - 5);if (text_to_sql("FindTime", findTime.Value.ToShortDateString()) == ""){}else{sb = sb + text_to_sql("FindTime", findTime.Value.ToShortDateString());}}string ab1=sb.Substring(sb.Length-5);if(sb.Substring(sb.Length-5)==" and "){sb = sb.Substring(0, sb.Length - 5);}try{OleDbCommand cmd = new OleDbCommand(sb, con);OleDbDataReader dbreader = cmd.ExecuteReader();listView1.Items.Clear();while (dbreader.Read()){ListViewItem Item = new ListViewItem();Item.SubItems.Clear();Item.SubItems[0].Text = dbreader.GetValue(0).ToString();//读取数据库中字段 for (int i = 1; i < dbreader.FieldCount; i++){string value = dbreader.GetValue(i).ToString();string valueresult = "";if (i == 3){valueresult = value.Substring(0, value.Length - 7);}else{valueresult = value;}Item.SubItems.Add(valueresult);//显示}listView1.Items.AddRange(new ListViewItem[] { Item });}int a = dbreader.Depth;listView1.Items[a].EnsureVisible();}catch (Exception re){MessageBox.Show("Database search failed!!" + re.Message);}db_close();}//reset all the text boxesprivate void button_reset_MouseClick(object sender, MouseEventArgs e){text_id.Text = "";text_st.Text = "";text_inventor.Text = "";text_nuap.Text = "";text_aw1.Text = "";text_aw2.Text = "";text_aw3.Text = "";text_aw4.Text = "";text_aw5.Text = "";text_aw6.Text = "";text_aw7.Text = "";text_aw8.Text = "";text_api21.Text = "";text_api31.Text = "";text_api41.Text = "";text_api51.Text = "";text_api61.Text = "";text_api71.Text = "";text_api81.Text = "";text_other.Text = "";}//reset all the text boxesprivate void button_reset_Click(object sender, EventArgs e){text_id.Text = "";text_st.Text = "";text_inventor.Text = "";text_nuap.Text = "";text_aw1.Text = "";text_aw2.Text = "";text_aw3.Text = "";text_aw4.Text = "";text_aw5.Text = "";text_aw6.Text = "";text_aw7.Text = "";text_aw8.Text = "";text_api21.Text = "";text_api31.Text = "";text_api41.Text = "";text_api51.Text = "";text_api61.Text = "";text_api71.Text = "";text_api81.Text = "";text_other.Text = "";picBox.Image = null;findTime.ShowCheckBox = true;}// to generate the search sql expressionprivate string text_to_sql(string keyname, string txt){//string test = txt;string sqlexp = "";if (txt != "" && keyname != ""){if (keyname == "ID" || keyname == "ST" || keyname == "INVENTER" || keyname == "Other"){//sqlexp = keyname + "=\"" + txt + "\"";sqlexp = keyname + " Like \"%" + txt + "%\"";}else if (keyname == "FindTime"){if (findTime.Checked == true){sqlexp = keyname + "=format('" + findTime.Value.ToShortDateString() + "','yyyy/mm/dd')";}else{return sqlexp;}}else{a = txt.IndexOf("-");if (txt.IndexOf("-") > 0){try{int indx = txt.IndexOf("-");string fromvalue = txt.Substring(0, indx);string tovalue = txt.Remove(0,indx+1);double fromv = Convert.ToDouble(fromvalue);double tov= Convert.ToDouble(tovalue);if (Convert.ToDouble(fromvalue) >= Convert.ToDouble(tovalue)){MessageBox.Show(keyname + " input a wrong range!!!");}else{sqlexp = keyname + ">=" + fromvalue + " and " + keyname + "<=" + tovalue;}}catch (Exception re){MessageBox.Show(keyname + " input a wrong format!!!" + re.Message);sqlexp = "ERROR";}}else{sqlexp = keyname + "=" + txt;}}}return sqlexp;}private void picBox_DoubleClick(object sender, EventArgs e){OpenFileDialog ofd = new OpenFileDialog();ofd.InitialDirectory = currentdir;ofd.Filter = "所有图片文件|*.*|JPEG(*JPG)|*.jpg|位图文件(*BMP)|*.BMP";ofd.RestoreDirectory = true;ofd.FilterIndex = 1;String fName;if (ofd.ShowDialog() == DialogResult.OK){fName = ofd.FileName;Image myImage = Image.FromFile(fName, true);picBox.SizeMode = PictureBoxSizeMode.StretchImage;picBox.Image = myImage;ImgPath = ofd.FileName;// MessageBox.Show(ImgPath);}}private void picBox_Click(object sender, EventArgs e){}//set the last of listview is selectedprivate void set_listview_selected(){if (listView1.Items.Count != 0){listView1.FullRowSelect = true;//listView1.Items[0].Selected= true;listView1.GetItemAt(0, 0);//listView1.Items[0].Focused = true;}}//check the value of control is emptyprivate void check_impty(){if (text_id.Text == "") text_id.Text = "0";if (text_st.Text == "") text_st.Text = "0";if (text_inventor.Text == "") text_inventor.Text = "0";if (text_nuap.Text == "") text_nuap.Text = "0";if (text_aw1.Text == "") text_aw1.Text = "0";if (text_aw2.Text == "") text_aw2.Text = "0";if (text_aw3.Text == "") text_aw3.Text = "0";if (text_aw4.Text == "") text_aw4.Text = "0";if (text_aw5.Text == "") text_aw5.Text = "0";if (text_aw6.Text == "") text_aw6.Text = "0";if (text_aw7.Text == "") text_aw7.Text = "0";if (text_aw8.Text == "") text_aw8.Text = "0";if (text_api21.Text == "") text_api21.Text = "0";if (text_api31.Text == "") text_api31.Text = "0";if (text_api41.Text == "") text_api41.Text = "0";if (text_api51.Text == "") text_api51.Text = "0";if (text_api61.Text == "") text_api61.Text = "0";if (text_api71.Text == "") text_api71.Text = "0";if (text_api81.Text == "") text_api81.Text = "0";if (text_other.Text == "") text_other.Text = "0";// text_id.Text = "";//text_st.Text = "";//text_inventor.Text = "";//text_nuap.Text = "";//text_aw1.Text = "";//text_aw2.Text = "";//text_aw3.Text = "";//text_aw4.Text = "";//text_aw5.Text = "";//text_aw6.Text = "";//text_aw7.Text = "";//text_aw8.Text = "";//text_api21.Text = "";//text_api31.Text = "";//text_api41.Text = "";//text_api51.Text = "";//text_api61.Text = "";//text_api71.Text = "";//text_api81.Text = "";//text_other.Text = "";}private void groupBox1_Enter(object sender, EventArgs e){}private void Form1_Load_1(object sender, EventArgs e){}private void text_aw1_KeyPress(object sender, KeyPressEventArgs e){digit_check(text_aw1.Text, e);}//verify the the whether the textbox input is digitprivate void digit_check(string textin, KeyPressEventArgs e){//判断按键是不是要输入的类型。if (((int)e.KeyChar < 48 || (int)e.KeyChar > 57) && (int)e.KeyChar != 8 && (int)e.KeyChar != 46)e.Handled = true;//小数点的处理。// int abc = (int)e.KeyChar;if((int)e.KeyChar==45){if (textin.Length == 0){e.Handled = true;   //'-'不能在第一位}else{e.Handled = false;}}if ((int)e.KeyChar == 46)                           //小数点{if (textin.Length == 0){e.Handled = true;   //小数点不能在第一位}else{float f;float oldf;bool b1 = false, b2 = false;b1 = float.TryParse(text_rnum.Text, out oldf);b2 = float.TryParse(text_rnum.Text + e.KeyChar.ToString(), out f);if (b2 == false){if (b1 == true)e.Handled = true;elsee.Handled = false;}}}}private void text_aw2_KeyPress(object sender, KeyPressEventArgs e){digit_check(text_aw2.Text, e);}private void text_aw3_KeyPress(object sender, KeyPressEventArgs e){digit_check(text_aw3.Text, e);}private void text_aw4_KeyPress(object sender, KeyPressEventArgs e){digit_check(text_aw4.Text, e);}private void text_aw5_KeyPress(object sender, KeyPressEventArgs e){digit_check(text_aw5.Text, e);}private void text_aw6_KeyPress(object sender, KeyPressEventArgs e){digit_check(text_aw6.Text, e);}private void text_aw7_KeyPress(object sender, KeyPressEventArgs e){digit_check(text_aw7.Text, e);}private void text_aw8_KeyPress(object sender, KeyPressEventArgs e){digit_check(text_aw8.Text, e);}private void text_api21_KeyPress(object sender, KeyPressEventArgs e){digit_check(text_api21.Text, e);}private void text_api31_KeyPress(object sender, KeyPressEventArgs e){digit_check(text_api31.Text, e);}private void text_api41_KeyPress(object sender, KeyPressEventArgs e){digit_check(text_api41.Text, e);}private void text_api51_KeyPress(object sender, KeyPressEventArgs e){digit_check(text_api51.Text, e);}private void text_api61_KeyPress(object sender, KeyPressEventArgs e){digit_check(text_api61.Text, e);}private void text_api71_KeyPress(object sender, KeyPressEventArgs e){digit_check(text_api71.Text, e);}private void text_api81_KeyPress(object sender, KeyPressEventArgs e){digit_check(text_api81.Text, e);}private void text_nuap_KeyPress(object sender, KeyPressEventArgs e){digit_check(text_nuap.Text, e);}//get the record number in database and show in text_rnumprivate void update_text_rnum(){db_open();//MessageBox.Show(listView1.FocusedItem.SubItems[0].Text);string sb = "select count(*)  from UVADB";OleDbCommand cmd = new OleDbCommand(sb, con);OleDbDataReader dbreader = cmd.ExecuteReader();dbreader.Read();text_rnum.Text = dbreader.GetValue(0).ToString();db_close();}//verify the default whether the accdb file is in install dirprivate void check_db_file(){}private void CopyDir(string srcPath, string aimPath){try{// 检查目标目录是否以目录分割字符结束如果不是则添加之 //if (aimPath[aimPath.Length - 1] != System.IO.Path.DirectorySeparatorChar)//{//    aimPath += System.IO.Path.DirectorySeparatorChar;//}// 判断目标目录是否存在如果不存在则新建之 //if (!System.IO.Directory.Exists(aimPath))//{//    System.IO.Directory.CreateDirectory(aimPath);//}// 得到源目录的文件列表，该里面是包含文件以及目录路径的一个数组 // 如果你指向copy目标文件下面的文件而不包含目录请使用下面的方法 // string[] fileList = Directory.GetFiles(srcPath); //string[] fileList = System.IO.Directory.GetFileSystemEntries(srcPath);// 遍历所有的文件和目录 //foreach (string file in fileList)//{//    // 先当作目录处理如果存在这个目录就递归Copy该目录下面的文件 //    if (System.IO.Directory.Exists(file))//    {//        CopyDir(file, aimPath + System.IO.Path.GetFileName(file));//    }// 否则直接Copy文件 //else//{System.IO.File.Copy(srcPath, aimPath, false);//}//}}catch (Exception e){throw;}}}
}









												


											

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