C# 講解五種導出access數據到Excel文件格式中

1.首先聲明，這些方法也都是本人搜集的資料，然後為已所用，程序中不足之處，還請高手指點. 這些方法都沒有關閉Excel進程。
2.網上有好多關於用SQL語句導入導出的例子，這裡不再重復寫了。

方法1：調用com組件,導出access數據到Excel,就是直接調用access的導出功能,此方法速度超級快
using Access;
Access.ApplicationClass oAccess = new Access.ApplicationClass();
oAccess.Visible = false;
try
{        //ACCESS9:
      oAccess.OpenCurrentDatabase("d:\wcf.mdb",false,"");
      //導出到excel
oAccess.DoCmd.TransferSpreadsheet(Access.AcDataTransferType.acExport,Acce      ss.AcSpreadSheetType.acSpreadsheetTypeExcel9,"工作表名","d:\wcf.xls",true,null,null);
     //導入txt
//oAccess.DoCmd.TransferText(Access.AcTextTransferType.acExportDelim,"","Enterprise","d:\wcf.txt",true,"",0);
oAccess.CloseCurrentDatabase();
oAccess.DoCmd.Quit(Access.AcQuitOption.acQuitSaveNone );
System.Runtime.InteropServices.Marshal.ReleaseComObject (oAccess);
oAccess = null;
MessageBox.Show("導入成功");
}
catch(Exception ex)
{
MessageBox.Show(ex.ToString());
}
finally
{
GC.Collect();
}

方法2：此方法速度也是超級快，只不過導出的格式非標准的Excel格式，默認工作表名與文件名相同
string FileName="d:\abc.xls";
System.Data.DataTable dt=new System.Data.DataTable();
FileStream objFileStream;
StreamWriter objStreamWriter;
string strLine="";
objFileStream = new FileStream(FileName,FileMode.OpenOrCreate,FileAccess.Write);
objStreamWriter = new StreamWriter(objFileStream,System.Text.Encoding.Unicode);
for(int i=0;i<dt.Columns.Count ;i )
{
strLine=strLine dt.Columns[i].ColumnName.ToString() Convert.ToChar(9);
}
objStreamWriter.WriteLine(strLine);
strLine="";
for(int i=0;i<dt.Rows.Count;i )
{
strLine=strLine (i 1) Convert.ToChar(9);
for(int j=1;j<dt.Columns.Count;j )
{
strLine=strLine dt.Rows[i][j].ToString() Convert.ToChar(9);
}
objStreamWriter.WriteLine(strLine);
strLine="";
}
objStreamWriter.Close();
objFileStream.Close ();

方法3：用Ado.net 此方法速度較以上兩個顯得慢了一些，數據量越大越明顯
int Id=0;
string Name="測試";
string FileName="d:\abc.xls";
System.Data.DataTable dt=new System.Data.DataTable();
long totalCount=dt.Rows.Count ;
long rowRead=0;
float percent=0;
OleDbParameter[] parm=new OleDbParameter[dt.Columns.Count];
string connString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" FileName ";Extended Properties=Excel 8.0;";
OleDbConnection objConn = new OleDbConnection(connString);
OleDbCommand objCmd = new OleDbCommand();
objCmd.Connection = objConn;
objConn.Open();
//建立表結構
objCmd.CommandText = @"CREATE TABLE Sheet1(序號 Integer,名稱 varchar)";
objCmd.ExecuteNonQuery();
//建立插入動作的Command
objCmd.CommandText = "INSERT INTO Sheet1(" Id "," Name ")";
parm[0]=new OleDbParameter("@Id", OleDbType.Integer);
objCmd.Parameters.Add (parm[0]);
parm[1]=new OleDbParameter("@Company", OleDbType.VarChar);
objCmd.Parameters.Add(parm[1]);
//遍歷DataTable將數據插入新建的Excel文件中
for(int i=0;i<dt.Rows.Count;i )
{ 
parm[0].Value=i 1;
for(int j=1;j<parm.Length;j )
{
parm[j].Value =dt.Rows[i][j];
}
objCmd.ExecuteNonQuery();
rowRead ;
percent=((float)(100*rowRead))/totalCount; 
//this.FM.CaptionText.Text = "正在導出數據，已導出[" percent.ToString("0.00") "%]...";
if(i==dt.Rows.Count-1)
//this.FM.CaptionText.Text = "請稍後......";
System.Windows.Forms .Application.DoEvents();
}
objConn.Close();
//this.FM.CaptionText.Text = "";

方法4：此方法調用com組件，速度都慢於以上3個方法
using Excel;
System.Data.DataTable dt=new System.Data.DataTable();
string FileName="d:\abc.xls";
long totalCount=dt.Rows.Count;
long rowRead=0;
float percent=0;
Excel.Application xlApp=null;
xlApp=new Excel.Application();
Excel.Workbooks workbooks=xlApp.Workbooks;
Excel.Workbook workbook=workbooks.Add(Excel.XlWBATemplate.xlWBATWorksheet);
Excel.Worksheet worksheet=(Excel.Worksheet )workbook.Worksheets[1];
//取得sheet1
Excel.Range range;
//寫入字段
for(int i=0;i<dt.Columns.Count;i )
{
worksheet.Cells[1,i 1]=dt.Columns[i].ColumnName;
range=(Excel.Range)worksheet.Cells[1,i 1];
}
for(int r=0;r<dt.Rows.Count;r )
{
worksheet.Cells[r 2,1]=r 1;
for(int i=0;i<dt.Columns.Count;i )
{
//worksheet.Cells[r 2,i 1]=dt.Rows[r][i];
if(i 1!=dt.Columns.Count)
worksheet.Cells[r 2,i 2]= dt.Rows[r][i 1];
}
rowRead ;
percent=((float)(100*rowRead))/totalCount; 
//this.FM.CaptionText.Text = "正在導出數據，已導出[" percent.ToString("0.00") "%]...";
System.Windows.Forms .Application.DoEvents();
}
range=worksheet.get_Range(worksheet.Cells[2,1],worksheet.Cells[dt.Rows.Count 2,dt.Columns.Count]);
workbook.Saved =true;
workbook.SaveCopyAs(FileName);
//this.FM.CaptionText.Text = "";

方法5：利用剪貼板 ,有人說此方法很快，但是我用時，這種方法最慢，請高手指點.
System.Data.DataTable dt=new System.Data.DataTable();
string filePath=@"d:abc.xls";
object oMissing = System.Reflection.Missing.Value;
Excel.ApplicationClass xlApp = new Excel.ApplicationClass();
try
{
xlApp.Visible = false;
xlApp.DisplayAlerts = false;
Excel.Workbooks oBooks = xlApp.Workbooks;
Excel._Workbook xlWorkbook = null;
xlWorkbook = oBooks.Open(filePath,oMissing,oMissing,oMissing,oMissing,oMissing,oMissing,
oMissing,oMissing,oMissing,oMissing,oMissing,oMissing,oMissing,oMissing);
Excel.Worksheet xlWorksheet;
// 添加入一個新的Sheet頁。
xlWorksheet = (Excel.Worksheet)xlWorkbook.Worksheets.Add(oMissing,oMissing,1,oMissing);
// 以TableName作為新加的Sheet頁名。
xlWorksheet.Name ="企業名錄";
// 取出這個DataTable中的所有值,暫存於stringBuffer中。
string stringBuffer = "";
for( int j=0; j<dt.Rows.Count; j )
{
for( int k=0; k<dt.Columns.Count; k )
{
stringBuffer = dt.Rows[j][k].ToString();
if( k < dt.Columns.Count - 1 )
stringBuffer = " ";
}
stringBuffer = " ";
}
// 利用系統剪切板
System.Windows.Forms.Clipboard.SetDataObject("");
// 將stringBuffer放入剪切板。
System.Windows.Forms.Clipboard.SetDataObject(stringBuffer);
// 選中這個sheet頁中的第一個單元格
((Excel.Range)xlWorksheet.Cells[1,1]).Select();
// 粘貼！
xlWorksheet.Paste(oMissing,oMissing);
// 清空系統剪切板。
System.Windows.Forms.Clipboard.SetDataObject("");
// 保存並關閉這個工作簿。
xlWorkbook.Close( Excel.XlSaveAction.xlSaveChanges , oMissing, oMissing );
System.Runtime.InteropServices.Marshal.ReleaseComObject(xlWorkbook);
xlWorkbook = null;