C# sample to create enormous data for Excel 

C#導出Excel方法有多種﹐常用的按照Microsoft 的方法如下:
1﹑"Use Automation to Transfer Data Cell by Cell "
2﹑"Use Automation to Transfer an Array of Data to a Range on a Worksheet "
3﹑"Use Automation to Transfer an ADO Recordset to a Worksheet Range "
4﹑"Use Automation to Create a QueryTable on a Worksheet"
5﹑"Use the Clipboard"
6﹑"Create a Delimited Text File that Excel Can Parse into Rows and Columns"
7﹑"Transfer Data to a Worksheet Using ADO.NET "
在此本人主要使用第4種方法:即利用Excel的QueryTable導出海量數據。
要利用Excel的QueryTable的方法﹐首先需要引用Excel類庫。這個我就不多說了。
第二步就是新增一個窗體文件﹐為簡單起見﹐只在窗體上加一個button按鈕。在Button Click事件中加入操作的代碼。整個操作﹐我只在一個類中實現﹐源碼附貼如下(office2003)﹕
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsApplication3
{
public partial class Form1 : Form
{
private Microsoft.Office.Interop.Excel.Application m_objExcel = null;
private Microsoft.Office.Interop.Excel.Workbooks m_objBooks = null;
private Microsoft.Office.Interop.Excel._Workbook m_objBook = null;
private Microsoft.Office.Interop.Excel.Sheets m_objSheets = null;
private Microsoft.Office.Interop.Excel._Worksheet m_objSheet = null;
private Microsoft.Office.Interop.Excel.Range m_objRange = null;
//private Microsoft.Office.Interop.Excel.Font m_objFont = null;
//private Microsoft.Office.Interop.Excel.QueryTables m_objQryTables = null;
private Microsoft.Office.Interop.Excel._QueryTable m_objQryTable = null;
// Frequenty-used variable for optional arguments.
private object m_objOpt = System.Reflection.Missing.Value;
//DataBase-used variable
private System.Data.SqlClient.SqlConnection sqlConn = null;
private string strConnect = "Data Source=＇192.168.168.253＇;Password = SHS;User ID=SHS;Initial Catalog=TEST_KM_ERP";
private System.Data.SqlClient.SqlCommand sqlCmd = null;

//Sheets variable
private double dbSheetSize = 65535;//the hight limit number in one sheet
private int intSheetTotalSize = 0;//total record can divied sheet number
private double dbTotalSize = 0;//record total number

public Form1()
{
InitializeComponent();
}

private int GetTotalSize()
{
sqlConn = new System.Data.SqlClient.SqlConnection(strConnect);
sqlCmd = new System.Data.SqlClient.SqlCommand("Select Count(*) From PD_WORKBIL_MST"， sqlConn);
sqlConn.Open();
dbTotalSize = (int)sqlCmd.ExecuteScalar();
sqlConn.Close();
return (int)Math.Ceiling(dbTotalSize / this.dbSheetSize);
}
private void DeclareExcelApp()
{
m_objExcel = new Microsoft.Office.Interop.Excel.Application();
m_objBooks = (Microsoft.Office.Interop.Excel.Workbooks)m_objExcel.Workbooks;
m_objBook = (Microsoft.Office.Interop.Excel._Workbook)(m_objBooks.Add(m_objOpt));
m_objSheets = (Microsoft.Office.Interop.Excel.Sheets)m_objBook.Worksheets;
intSheetTotalSize = GetTotalSize();
if (intSheetTotalSize ＜= 3)
{
if (this.dbTotalSize ＜= this.dbSheetSize)
{
this.ExportDataByQueryTable(1， false);
return;
}
else if (this.dbTotalSize ＜= this.dbSheetSize * 2)
{
this.ExportDataByQueryTable(1， false);
this.ExportDataByQueryTable(2， true);
return;
}
else
{
this.ExportDataByQueryTable(1， false);
this.ExportDataByQueryTable(2， true);
this.ExportDataByQueryTable(3， true);
return;
}
} 
for (int i = 3; i ＜ intSheetTotalSize; i++)
{
m_objSheets.Add(m_objOpt， m_objSheets.get_Item(i)， m_objOpt， m_objOpt);
}
ExportDataByQueryTable(1， false);
for (int i = 2; i ＜= m_objSheets.Count; i++)
{
ExportDataByQueryTable(i，true);
}
}
private void SaveExcelApp()
{
string excelFileName = string.Empty;
SaveFileDialog sf = new SaveFileDialog();
sf.Filter = "*.xls|*.*";
if (sf.ShowDialog() == DialogResult.OK)
{
excelFileName = sf.FileName;
}
else
{
return;
}
m_objBook.SaveAs(excelFileName， m_objOpt， m_objOpt， m_objOpt， m_objOpt， m_objOpt，
Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange， 
m_objOpt， m_objOpt， m_objOpt， m_objOpt， m_objOpt);
}
private void ExportDataByQueryTable(int intSheetNumber，bool blIsMoreThan)
{
string strQuery = string.Empty;
if (blIsMoreThan)
{
strQuery = "Select Top " +
this.dbSheetSize + " * From PD_WORKBIL_MST Where Not CMPID In (Select Top " +
dbSheetSize * (intSheetNumber-1) + " CMPID From PD_WORKBIL_MST)";
}
else
{
strQuery = "Select Top " +this.dbSheetSize + " * From PD_WORKBIL_MST ";

}
m_objSheet = (Microsoft.Office.Interop.Excel._Worksheet)(m_objSheets.get_Item(intSheetNumber));
m_objSheet.get_Range("A1"， m_objOpt).set_Value(m_objOpt， "中文測試一");
m_objSheet.get_Range("B1"， m_objOpt).set_Value(m_objOpt， "中文測試二");
m_objSheet.get_Range("C1"， m_objOpt).set_Value(m_objOpt， "中文測試三");
m_objSheet.get_Range("D1"， m_objOpt).set_Value(m_objOpt， "中文測試四");
m_objSheet.get_Range("E1"， m_objOpt).set_Value(m_objOpt， "中文測試五");
m_objRange = m_objSheet.get_Range("A2"， m_objOpt);
m_objQryTable = m_objSheet.QueryTables.Add("OLEDB;Provider=SQLOLEDB.1;" + strConnect， m_objRange， strQuery);
m_objQryTable.RefreshStyle = Microsoft.Office.Interop.Excel.XlCellInsertionMode.xlInsertEntireRows;
m_objQryTable.FieldNames = false;
m_objQryTable.Refresh(false);
}
private void button1_Click(object sender， EventArgs e)
{
DeclareExcelApp();
SaveExcelApp();
}
}
}
使用office2000的話﹐好像類庫有些不同﹐為給大家一個比較﹐也將源碼附貼如下﹕
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsApplication2
{
public partial class Form1 : Form
{
Excel.Range m_objRange = null;
Excel.Application m_objExcel = null;
Excel.Workbooks m_objBooks = null;
Excel._Workbook m_objBook = null;
Excel.Sheets m_objSheets = null;
Excel._Worksheet m_objSheet = null;
Excel.QueryTable m_objQryTable = null;
object m_objOpt = System.Reflection.Missing.Value;
//DataBase-used variable
private System.Data.SqlClient.SqlConnection sqlConn = null;
private string strConnect = "Data Source=＇192.168.168.253＇;Password = SHS;User ID=SHS;Initial Catalog=TEST_KM_ERP";
private System.Data.SqlClient.SqlCommand sqlCmd = null;

//Sheets variable
private double dbSheetSize = 65535;//the hight limit number in one sheet
private int intSheetTotalSize = 0;//total record can divied sheet number
private double dbTotalSize = 0;//record total number

public Form1()
{
InitializeComponent();
}

private int GetTotalSize()
{
sqlConn = new System.Data.SqlClient.SqlConnection(strConnect);
sqlCmd = new System.Data.SqlClient.SqlCommand("Select Count(*) From PD_WORKBIL_MST"， sqlConn);
sqlConn.Open();
dbTotalSize = (int)sqlCmd.ExecuteScalar();
sqlConn.Close();
return (int)Math.Ceiling(dbTotalSize / this.dbSheetSize);
}
private void DeclareExcelApp()
{
m_objExcel = new Excel.ApplicationClass();
m_objBooks = (Excel.Workbooks)m_objExcel.Workbooks;
m_objBook = (Excel._Workbook)(m_objBooks.Add(m_objOpt));
m_objSheets = (Excel.Sheets)m_objBook.Worksheets;
intSheetTotalSize = GetTotalSize();
if (intSheetTotalSize ＜= 3)
{
if (this.dbTotalSize ＜= this.dbSheetSize)
{
this.ExportDataByQueryTable(1， false);
return;
}
else if (this.dbTotalSize ＜= this.dbSheetSize * 2)
{
this.ExportDataByQueryTable(1， false);
this.ExportDataByQueryTable(2， true);
return;
}
else
{
this.ExportDataByQueryTable(1， false);
this.ExportDataByQueryTable(2， true);
this.ExportDataByQueryTable(3， true);
return;
}
}
for (int i = 3; i ＜ intSheetTotalSize; i++)
{
m_objSheets.Add(m_objOpt， m_objSheets.get_Item(i)， m_objOpt， m_objOpt);
}
ExportDataByQueryTable(1， false);
for (int i = 2; i ＜= m_objSheets.Count; i++)
{
ExportDataByQueryTable(i， true);
}
}
private void SaveExcelApp()
{
string excelFileName = string.Empty;
SaveFileDialog sf = new SaveFileDialog();
sf.Filter = "*.xls|*.*";
if (sf.ShowDialog() == DialogResult.OK)
{
excelFileName = sf.FileName;
}
else
{
return;
}
m_objBook.SaveAs(excelFileName， m_objOpt， m_objOpt， m_objOpt， m_objOpt， m_objOpt， 
Excel.XlSaveAsAccessMode.xlNoChange， m_objOpt， m_objOpt， m_objOpt， m_objOpt);
}
private void ExportDataByQueryTable(int intSheetNumber， bool blIsMoreThan)
{
string strQuery = string.Empty;
if (blIsMoreThan)
{
strQuery = "Select Top " +
this.dbSheetSize + " * From PD_WORKBIL_MST Where Not CMPID In (Select Top " +
dbSheetSize * (intSheetNumber-1) + " CMPID From PD_WORKBIL_MST)";
}
else
{
strQuery = "Select Top " + this.dbSheetSize + " * From PD_WORKBIL_MST ";

}
m_objSheet = (Excel._Worksheet)(m_objSheets.get_Item(intSheetNumber));
m_objSheet.Cells[1，1] = "中文測試一";
m_objSheet.Cells[1，2] = "中文測試二";
m_objSheet.Cells[1，3] = "中文測試三";
m_objSheet.Cells[1，4] = "中文測試四";
m_objSheet.Cells[1，5] = "中文測試五";
m_objRange = m_objSheet.get_Range("A2"， m_objOpt);
m_objQryTable = m_objSheet.QueryTables.Add("OLEDB;Provider=SQLOLEDB.1;" + strConnect， m_objRange， strQuery);
m_objQryTable.RefreshStyle = Excel.XlCellInsertionMode.xlInsertEntireRows;
m_objQryTable.FieldNames = false;
m_objQryTable.Refresh(false);
}

private void button1_Click(object sender， EventArgs e)
{
DeclareExcelApp();
SaveExcelApp();

}

}
}
在本篇中﹐是將13萬多條記錄分多個Sheet導出。如果你的機器大概像我這樣:P4CPU，1G內存的話。全部導出包括保存也就是20秒左右就可以全部搞定。
也許大家會有更好的方法來實現﹐歡迎各位交流﹗