在做一个小项目，需要把一些查询结果导出到Excel，找了一些资料，自己也总结出了一点方法，与大家共享。

一、首先简要描述一下如何操作Excel表


先要添加对Excel的引用。选择项目-〉添加引用-〉COM-〉添加Microsoft Excel 9.0。（不同的office讲会有不同版本的dll文件）。
using Excel;
using System.Reflection;

//产生一个Excel.Application的新进程
Excel.Application app = new Excel.Application();
if (app == null)
{
statusBar1.Text = "ERROR: EXCEL couldn''t be started!";
return ;
}

app.Visible = true; //如果只想用程序控制该excel而不想让用户操作时候，可以设置为false
app.UserControl = true;

Workbooks workbooks =app.Workbooks;

_Workbook workbook = workbooks.Add(XlWBATemplate.xlWBATWorksheet); //根据模板产生新的workbook
// _Workbook workbook = workbooks.Add("c:\\a.xls"); //或者根据绝对路径打开工作簿文件a.xls


Sheets sheets = workbook.Worksheets;
_Worksheet worksheet = (_Worksheet) sheets.get_Item(1);
if (worksheet == null)
{
statusBar1.Text = "ERROR: worksheet == null";
return;
}


// This paragraph puts the value 5 to the cell G1
Range range1 = worksheet.get_Range("A1", Missing.Value);
if (range1 == null)
{
statusBar1.Text = "ERROR: range == null";
return;
}
const int nCells = 2345;
range1.Value2 = nCells;



二、示例程序


在Visual Studio .NET中建立一个C# WinForm工程.
添加Microsoft Excel Object Library引用:
右键单击Project , 选“添加引用”
在COM 标签项，选中 locate Microsoft Excel Object Library
点确定按钮完成添加引用。 On the View menu, select Toolbox to display the Toolbox. Add two buttons and a check box to Form1.
在Form1上添加一个button1，双击 Button1，添加click事件的代码.把数组里的数据填到Excel表格。
首先添加引用：

using System.Reflection;
using Excel = Microsoft.Office.Interop.Excel;


声明两个类的成员变量
Excel.Application objApp;
Excel._Workbook objBook;

private void button1_Click(object sender, System.EventArgs e)
{
Excel.Workbooks objBooks;
Excel.Sheets objSheets;
Excel._Worksheet objSheet;
Excel.Range range;

try
{
// Instantiate Excel and start a new workbook.
objApp = new Excel.Application();
objBooks = objApp.Workbooks;
objBook = objBooks.Add( Missing.Value );
objSheets = objBook.Worksheets;
objSheet = (Excel._Worksheet)objSheets.get_Item(1);

//Get the range where the starting cell has the address
//m_sStartingCell and its dimensions are m_iNumRows x m_iNumCols.
range = objSheet.get_Range("A1", Missing.Value);
range = range.get_Resize(5, 5);

if (this.FillWithStrings.Checked == false)
{
//Create an array.
double[,] saRet = new double[5, 5];

//Fill the array.
for (long iRow = 0; iRow < 5; iRow++)
{
for (long iCol = 0; iCol < 5; iCol++)
{
//Put a counter in the cell.
saRet[iRow, iCol] = iRow * iCol;
}
}

//Set the range value to the array.
range.set_Value(Missing.Value, saRet );
}

else
{
//Create an array.
string[,] saRet = new string[5, 5];

//Fill the array.
for (long iRow = 0; iRow < 5; iRow++)
{
for (long iCol = 0; iCol < 5; iCol++)
{
//Put the row and column address in the cell.
saRet[iRow, iCol] = iRow.ToString() + "|" + iCol.ToString();