怎么由DataSet将数据导入Excel

public static void ExportToExcel(string filePath, DataSet ds)
{
object oMissing = System.Reflection.Missing.Value;
Excel.ApplicationClass xlApp = new Excel.ApplicationClass();
try
{
// 打开Excel文件。以下为Office 2000.
Excel.Workbook xlWorkbook =
xlApp.Workbooks.Open(filePath, oMissing, oMissing,
oMissing, oMissing, oMissing,
oMissing, oMissing, oMissing,
oMissing, oMissing, oMissing,
oMissing);

Excel.Worksheet xlWorksheet;
// 循环所有DataTable
for( int i=0; i<ds.Tables.Count; i++ )
{
// 添加入一个新的Sheet页
xlWorksheet = (Excel.Worksheet)xlWorkbook.Worksheets.Add(oMissing,oMissing,1,oMissing);

// 以TableName作为新加的Sheet页名
xlWorksheet.Name = ds.Tables[i].TableName;

// 取出这个DataTable中的所有值,暂存于stringBuffer中
string stringBuffer = "";

for( int j=0; j<ds.Tables[i].Rows.Count; j++ )
{
for( int k=0; k<ds.Tables[i].Columns.Count; k++ )
{
stringBuffer += ds.Tables[i].Rows[j][k].ToString();
if( k < ds.Tables[i].Columns.Count - 1 )
stringBuffer += " ";
}
stringBuffer += " ";
}
// 利用系统剪切板
System.Windows.Forms.Clipboard.SetDataObject("");

// 将stringBuffer放入剪切板
System.Windows.Forms.Clipboard.SetDataObject(stringBuffer);

// 选中这个sheet页中的第一个单元格（下标从1开始）
((Excel.Range)xlWorksheet.Cells[1,1]).Select();

// 将剪切板里的内容粘贴在Sheet中
xlWorksheet.Paste(oMissing,oMissing);

// 清空系统剪切板
System.Windows.Forms.Clipboard.SetDataObject("");
}

// 保存并关闭这个工作簿
xlWorkbook.Close( Excel.XlSaveAction.xlSaveChanges, oMissing, oMissing );
System.Runtime.InteropServices.Marshal.ReleaseComObject(xlWorkbook);
xlWorkbook = null;
}
catch(Exception ex)
{
MessageBox.Show(ex.Message);
}
finally
{
// 释放COM对象
xlApp.Quit();
System.Runtime.InteropServices.Marshal.ReleaseComObject(xlApp);
GC.Collect();
}
}