using System; using System.Data; using System.Data.SqlClient; using System.Data.OleDb; using System.IO; public class Excel_Data { public Excel_Data() { // // TODO: 在此处添加构造函数逻辑 // } #region 处理Excel文件 /// <summary> /// 将指定Excel文件中的数据转换成DataTable对象，供应用程序进一步处理 /// </summary> /// <param name="filePath"></param> /// <returns></returns> public DataTable Import(string filePath) { System.Data.DataTable rs = new System.Data.DataTable(); bool canOpen=false;
一搜 一大堆。
http://www.cnblogs.com/Tsong/archive/2013/02/21/2920941.html
http://www.cnblogs.com/Areas/archive/2012/06/26/2563139.html
谢谢啦
System.Data.OleDb.OleDbConnection objConn = new System.Data.OleDb.OleDbConnection(
@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:/excell.xls" +
";Extended Properties=Excel 8.0;");
ds = new DataSet();
OleDbDataAdapter da = new OleDbDataAdapter("SELECT * FROM [Sheet1$]", objConn);
try
{
da.Fill(ds);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
objConn.Close();
return;
}
dataGridView1.DataSource = ds.Tables[0];
objConn.Close();
把EXCEL文件当做一个数据源来进行数据的读取操作，实例如下：
public DataSet ExcelToDS(string Path)
{
string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" +"Data Source="+ Path +";"+"Extended Properties=Excel 8.0;";
OleDbConnection conn = new OleDbConnection(strConn);
conn.Open();
string strExcel = "";
OleDbDataAdapter myCommand = null;
DataSet ds = null;
strExcel="select * from [sheet1$]";
myCommand = new OleDbDataAdapter(strExcel, strConn);
ds = new DataSet();
myCommand.Fill(ds,"table1");
return ds;
}
对于EXCEL中的表即sheet([sheet1$])如果不是固定的可以使用下面的方法得到
string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" +"Data Source="+ Path +";"+"Extended Properties=Excel 8.0;";
OleDbConnection conn = new OleDbConnection(strConn);
DataTable schemaTable = objConn.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Tables,null);
string tableName=schemaTable.Rows[0][2].ToString().Trim(); 另外：也可进行写入EXCEL文件，实例如下：
public void DSToExcel(string Path,DataSet oldds)
{
//先得到汇总EXCEL的DataSet 主要目的是获得EXCEL在DataSet中的结构
string strCon = " Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source ="+path1+";Extended Properties=Excel 8.0" ;
OleDbConnection myConn = new OleDbConnection(strCon) ;
string strCom="select * from [Sheet1$]";
myConn.Open ( ) ;
OleDbDataAdapter myCommand = new OleDbDataAdapter ( strCom, myConn ) ;
ystem.Data.OleDb.OleDbCommandBuilder builder=new OleDbCommandBuilder(myCommand);
//QuotePrefix和QuoteSuffix主要是对builder生成InsertComment命令时使用。
builder.QuotePrefix="["; //获取insert语句中保留字符（起始位置）
builder.QuoteSuffix="]"; //获取insert语句中保留字符（结束位置）
DataSet newds=new DataSet();
myCommand.Fill(newds ,"Table1") ;
for(int i=0;i<oldds.Tables[0].Rows.Count;i++)
{
//在这里不能使用ImportRow方法将一行导入到news中，因为ImportRow将保留原来DataRow的所有设置(DataRowState状态不变)。
在使用ImportRow后newds内有值，但不能更新到Excel中因为所有导入行的DataRowState!=Added
DataRow nrow=aDataSet.Tables["Table1"].NewRow();
for(int j=0;j<newds.Tables[0].Columns.Count;j++)
{
nrow[j]=oldds.Tables[0].Rows[i][j];
}
newds.Tables["Table1"].Rows.Add(nrow);
}
myCommand.Update(newds,"Table1");
myConn.Close();
}
2.方法二：引用的com组件：Microsoft.Office.Interop.Excel.dll 读取EXCEL文件
首先是Excel.dll的获取， 再在项目中添加引用该dll文件. //读取EXCEL的方法 (用范围区域读取数据)
private void OpenExcel(string strFileName)
{
object missing = System.Reflection.Missing.Value;
Application excel = new Application();//lauch excel application
if (excel == null)
{
Response.Write("<script>alert('Can't access excel')</script>");
}
else
{
excel.Visible = false; excel.UserControl = true;
// 以只读的形式打开EXCEL文件
Workbook wb = excel.Application.Workbooks.Open(strFileName, missing, true, missing, missing, missing,
missing, missing, missing, true, missing, missing, missing, missing, missing);
//取得第一个工作薄
Worksheet ws = (Worksheet)wb.Worksheets.get_Item(1); excel.Quit(); excel = null;
Process[] procs = Process.GetProcessesByName("excel"); foreach (Process pro in procs)
{
pro.Kill();//没有更好的方法,只有杀掉进程
}
GC.Collect();
}3.方法三：将EXCEL文件转化成CSV（逗号分隔）的文件，用文件流读取(等价就是读取一个txt文本文件)。
先引用命名空间:using System.Text;和using System.IO;
FileStream fs = new FileStream("d:\\Customer.csv", FileMode.Open, FileAccess.Read, FileShare.None);
StreamReader sr = new StreamReader(fs, System.Text.Encoding.GetEncoding(936)); string str = "";
string s = Console.ReadLine();
while (str != null)
{ str = sr.ReadLine();
string[] xu = new String[2];
xu = str.Split(',');
string ser = xu[0];
string dse = xu[1]; if (ser == s)
{ Console.WriteLine(dse);break;
}
} sr.Close();
另外也可以将数据库数据导入到一个txt文件，实例如下：
//txt文件名
string fn = DateTime.Now.ToString("yyyyMMddHHmmss") + "-" + "PO014" + ".txt"; OleDbConnection con = new OleDbConnection(conStr);
con.Open();
string sql = "select ITEM,REQD_DATE,QTY,PUR_FLG,PO_NUM from TSD_PO014";
//OleDbCommand mycom = new OleDbCommand("select * from TSD_PO014", mycon);
//OleDbDataReader myreader = mycom.ExecuteReader(); //也可以用Reader读取数据
DataSet ds = new DataSet();
OleDbDataAdapter oda = new OleDbDataAdapter(sql, con);
oda.Fill(ds, "PO014");
DataTable dt = ds.Tables[0]; FileStream fs = new FileStream(Server.MapPath("download/" + fn), FileMode.Create, FileAccess.ReadWrite);
StreamWriter strmWriter = new StreamWriter(fs); //存入到文本文件中
//把标题写入.txt文件中
//for (int i = 0; i <dt.Columns.Count;i++)
//{
// strmWriter.Write(dt.Columns[i].ColumnName + " ");
//}
foreach (DataRow dr in dt.Rows)
{
string str0, str1, str2, str3;
string str = "|"; //数据用"|"分隔开
str0 = dr[0].ToString();
str1 = dr[1].ToString();
str2 = dr[2].ToString();
str3 = dr[3].ToString();
str4 = dr[4].ToString().Trim();
strmWriter.Write(str0);
strmWriter.Write(str);
strmWriter.Write(str1);
strmWriter.Write(str);
strmWriter.Write(str2);
strmWriter.Write(str);
strmWriter.Write(str3);
strmWriter.WriteLine(); //换行
}
strmWriter.Flush();
strmWriter.Close();
if (con.State == ConnectionState.Open)
{
con.Close();
}
private void btn_Txt_Click(object sender, EventArgs e)
{
//连接Excel数据库
OleDbConnection olecon = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + txt_Path.Text + ";Extended Properties=Excel 8.0");
olecon.Open();//打开数据库连接
OleDbDataAdapter oledbda = new OleDbDataAdapter("select * from [" + cbox_SheetName.Text + "$]", olecon);//从工作表中查询数据
DataSet myds = new DataSet();//实例化数据集对象
oledbda.Fill(myds);//填充数据集
StreamWriter SWriter = new StreamWriter(cbox_SheetName.Text + ".txt", false, Encoding.Default);//实例化写入流对象
string P_str_Content = "";//存储读取的内容
for (int i = 0; i < myds.Tables[0].Rows.Count; i++)//遍历数据集中表的行数
{
for (int j = 0; j < myds.Tables[0].Columns.Count; j++)//遍历数据集中表的列数
{
P_str_Content += myds.Tables[0].Rows[i][j].ToString() + " ";//记录当前遍历到的内容
}//CodeGo.net/
P_str_Content += Environment.NewLine;//字符串换行
}
SWriter.Write(P_str_Content);//先文本文件中写入内容
SWriter.Close();//关闭写入流对象
SWriter.Dispose();//释放写入流所占用的资源
MessageBox.Show("已经将" + cbox_SheetName.Text + "工作表中的数据成功写入到了文本文件中", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
using System.Data;
using System.Data.SqlClient;
using System.Data.OleDb;
using System.IO; public class Excel_Data
{
public Excel_Data()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
#region 处理Excel文件
/// <summary>
/// 将指定Excel文件中的数据转换成DataTable对象，供应用程序进一步处理
/// </summary>
/// <param name="filePath"></param>
/// <returns></returns>
public DataTable Import(string filePath)
{
System.Data.DataTable rs = new System.Data.DataTable();
bool canOpen=false;
OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;"+
"Data Source=" + filePath + ";" +
"Extended Properties=\"Excel 8.0;\"");
try//尝试数据连接是否可用
{
conn.Open();
conn.Close();
canOpen=true;
}
catch{}
if(canOpen)
{
try//如果数据连接可以打开则尝试读入数据
{
OleDbCommand myOleDbCommand = new OleDbCommand("SELECT * FROM [Sheet1$]",conn);
OleDbDataAdapter myData = new OleDbDataAdapter(myOleDbCommand);
myData.Fill(rs);
conn.Close();
}
catch//如果数据连接可以打开但是读入数据失败，则从文件中提取出工作表的名称，再读入数据
{
string sheetName=GetSheetName(filePath);
if(sheetName.Length>0)
{
OleDbCommand myOleDbCommand = new OleDbCommand("SELECT * FROM ["+sheetName+"$]",conn);
OleDbDataAdapter myData = new OleDbDataAdapter(myOleDbCommand);
myData.Fill(rs);
conn.Close();
}
}
}
else
{
System.IO.StreamReader tmpStream=File.OpenText(filePath);
string tmpStr=tmpStream.ReadToEnd();
tmpStream.Close();
rs=GetDataTableFromString(tmpStr);
tmpStr="";
}
return rs;
}
/// <summary>
/// 将指定Html字符串的数据转换成DataTable对象 --根据“<tr><td>”等特殊字符进行处理
/// </summary>
/// <param name="tmpHtml">Html字符串</param>
/// <returns></returns>
private DataTable GetDataTableFromString(string tmpHtml)
{
string tmpStr=tmpHtml;
DataTable TB=new DataTable();
//先处理一下这个字符串，删除第一个<tr>之前合最后一个</tr>之后的部分
int index=tmpStr.IndexOf("<tr");
if(index>-1)
tmpStr=tmpStr.Substring(index);
else
return TB;
index=tmpStr.LastIndexOf("</tr>");
if(index>-1)
tmpStr=tmpStr.Substring(0,index+5);
else
return TB;
bool existsSparator=false;
char Separator=Convert.ToChar("^");
//如果原字符串中包含分隔符“^”则先把它替换掉
if(tmpStr.IndexOf(Separator.ToString())>-1)
{
existsSparator=true;
tmpStr=tmpStr.Replace("^","^$&^");
}
//先根据“</tr>”分拆
string[] tmpRow=tmpStr.Replace("</tr>","^").Split(Separator);
for(int i=0;i<tmpRow.Length-1;i++)
{
DataRow newRow=TB.NewRow();
string tmpStrI=tmpRow[i];
if(tmpStrI.IndexOf("<tr")>-1)
{
tmpStrI=tmpStrI.Substring(tmpStrI.IndexOf("<tr"));
if(tmpStrI.IndexOf("display:none")<0||tmpStrI.IndexOf("display:none")>tmpStrI.IndexOf(">"))
{
tmpStrI=tmpStrI.Replace("</td>","^");
string[] tmpField=tmpStrI.Split(Separator);
for(int j=0;j<tmpField.Length-1;j++)
{
tmpField[j]=RemoveString(tmpField[j],"<font>");
index=tmpField[j].LastIndexOf(">")+1;
if(index>0)
{
string field=tmpField[j].Substring(index,tmpField[j].Length-index);
if(existsSparator) field=field.Replace("^$&^","^");
if(i==0)
{
string tmpFieldName=field;
int sn=1;
while(TB.Columns.Contains(tmpFieldName))
{
tmpFieldName=field+sn.ToString();
sn+=1;
}
TB.Columns.Add(tmpFieldName);
}
else
{
newRow[j]=field;
}
}//end of if(index>0)
}
if(i>0)
TB.Rows.Add(newRow);
}
}
}
TB.AcceptChanges();
return TB;
}
/// <summary>
/// 从指定Html字符串中剔除指定的对象
/// </summary>
/// <param name="tmpHtml">Html字符串</param>
/// <param name="remove">需要剔除的对象--例如输入"<font>"则剔除"<font ???????>"和"</font>>"</param>
/// <returns></returns>
public string RemoveString(string tmpHtml,string remove)
{
tmpHtml=tmpHtml.Replace(remove.Replace("<","</"),"");
tmpHtml=RemoveStringHead(tmpHtml,remove);
return tmpHtml;
}
/// <summary>
/// 只供方法RemoveString()使用
/// </summary>
/// <returns></returns>
private static string RemoveStringHead(string tmpHtml,string remove)
{
//为了方便注释，假设输入参数remove="<font>"
if(remove.Length<1) return tmpHtml;//参数remove为空：不处理返回
if((remove.Substring(0,1)!="<")||(remove.Substring(remove.Length-1)!=">")) return tmpHtml;//参数remove不是<?????>：不处理返回
int IndexS=tmpHtml.IndexOf(remove.Replace(">",""));//查找“<font”的位置
int IndexE=-1;
if(IndexS>-1)
{
string tmpRight=tmpHtml.Substring(IndexS,tmpHtml.Length-IndexS);
IndexE=tmpRight.IndexOf(">");
if(IndexE>-1)
tmpHtml=tmpHtml.Substring(0,IndexS)+tmpHtml.Substring(IndexS+IndexE+1);
if(tmpHtml.IndexOf(remove.Replace(">",""))>-1)
tmpHtml=RemoveStringHead(tmpHtml,remove);
}
return tmpHtml;
}
/// <summary>
/// 将指定Excel文件中读取第一张工作表的名称
/// </summary>
/// <param name="filePath"></param>
/// <returns></returns>
private string GetSheetName(string filePath)
{
string sheetName="";
System.IO.FileStream tmpStream=File.OpenRead(filePath);
byte[] fileByte=new byte[tmpStream.Length];
tmpStream.Read(fileByte,0,fileByte.Length);
tmpStream.Close();
byte[] tmpByte=new byte[]{Convert.ToByte(11),Convert.ToByte(0),Convert.ToByte(0),Convert.ToByte(0),Convert.ToByte(0),Convert.ToByte(0),Convert.ToByte(0),Convert.ToByte(0),
Convert.ToByte(11),Convert.ToByte(0),Convert.ToByte(0),Convert.ToByte(0),Convert.ToByte(0),Convert.ToByte(0),Convert.ToByte(0),Convert.ToByte(0),
Convert.ToByte(30),Convert.ToByte(16),Convert.ToByte(0),Convert.ToByte(0)};
int index=GetSheetIndex(fileByte,tmpByte);
if(index>-1)
{
index+=16+12;
System.Collections.ArrayList sheetNameList=new System.Collections.ArrayList();
for(int i=index;i<fileByte.Length-1;i++)
{
byte temp=fileByte[i];
if(temp!=Convert.ToByte(0))
sheetNameList.Add(temp);
else
break;
}
byte[] sheetNameByte=new byte[sheetNameList.Count];
for(int i=0;i<sheetNameList.Count;i++)
sheetNameByte[i]=Convert.ToByte(sheetNameList[i]);
sheetName=System.Text.Encoding.Default.GetString(sheetNameByte);
}
return sheetName;
}
/// <summary>
/// 只供方法GetSheetName()使用
/// </summary>
/// <returns></returns>
private int GetSheetIndex(byte[] FindTarget,byte[] FindItem)
{
int index=-1;
int FindItemLength=FindItem.Length;
if(FindItemLength<1) return -1;
int FindTargetLength=FindTarget.Length;
if((FindTargetLength-1)<FindItemLength) return -1;
for(int i=FindTargetLength-FindItemLength-1;i>-1;i--)
{
System.Collections.ArrayList tmpList=new System.Collections.ArrayList();
int find=0;
for(int j=0;j<FindItemLength;j++)
{
if(FindTarget[i+j]==FindItem[j]) find+=1;
}
if(find==FindItemLength)
{
index=i;
break;
}
}
return index;
}
#endregion
}