将DataTable中的数据导出成Excel

public bool ExportFile(System.Data.DataTable dt)
{
SaveFileDialog sfd = new SaveFileDialog();
sfd.Filter = "Excel文件(*.xls)|*.xls|所有文件(*.*)|*.*";
sfd.Title = "Excel文件导出";
string fileName = "";
if (sfd.ShowDialog() == DialogResult.OK)
{
fileName = sfd.FileName;
Excel.Application app = new Excel.Application();
if (app == null)
{
MessageBox.Show("Excel启动失败！");
return false;
}
try
{
app.Visible = false;
Excel.Workbook xlWorkBook = app.Workbooks.Add(Type.Missing);
Excel.Worksheet xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
int i;
for (i = 0; i < dt.Columns.Count; i++)
{
xlWorkSheet.Cells[1, i + 1] = dt.Columns[i].ColumnName;
}
for (i = 0; i < dt.Rows.Count; i++)
{
for (int j = 0; j < dt.Columns.Count; j++)
{
string tt = dt.Rows[i][j].ToString();
xlWorkSheet.Cells[i + 2, j + 1] = tt;
}
}
xlWorkBook.SaveAs(fileName, Excel.XlFileFormat.xlWorkbookNormal, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Excel.XlSaveAsAccessMode.xlExclusive, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
xlWorkBook.Close(true, Type.Missing, Type.Missing);
app.Quit();

xlWorkSheet = null;
xlWorkBook = null;

return true;
}
catch (System.Exception exc)
{
MessageBox.Show("excel运行错误：" + exc.Message);
return false;
}
}
else
{
return false;
}
}