DataGridView导出成excel实例

public void ExportExcel(object Sender, EventArgs e)
{
DataGridView dt = this.dataGridView1;
if (dt.Rows.Count == 0)
{
MessageBox.Show("没有数据可供导出,请先抓去数据！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}
else
{
SaveFileDialog saveFileDialog2 = new SaveFileDialog();
saveFileDialog2.Filter = "Execl2003 files (*.xls)|*.xls|Execl2007 files (*.xlsx)|*.xlsx";
saveFileDialog2.FilterIndex = 0;
saveFileDialog2.RestoreDirectory = true;
saveFileDialog2.CreatePrompt = true;
saveFileDialog2.Title = "导出文件保存路径";
saveFileDialog2.FileName = null;
saveFileDialog2.ShowDialog();
string FileName = saveFileDialog2.FileName;

if (FileName.Length != 0)
{
//toolStripProgressBar1.Visible = true;

FileStream objFileStream;
StreamWriter objStreamWriter;
string strLine = "";
objFileStream = new FileStream(FileName, FileMode.OpenOrCreate, FileAccess.Write,FileShare.ReadWrite);
objStreamWriter = new StreamWriter(objFileStream, System.Text.Encoding.Unicode);
//toolStripProgressBar1.Value = 0;

for (int i = 0; i < dt.Columns.Count; i++)
{
strLine = strLine + dt.Columns[i].HeaderText.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 = 0; j < dt.Columns.Count; j++)
{
strLine = strLine + ((dt.Rows[i].Cells[j].Value == null) ? " " : dt.Rows[i].Cells[j].Value.ToString()) + Convert.ToChar(9);

}
objStreamWriter.WriteLine(strLine);
//toolStripProgressBar1.Value += 100 / dt.Rows.Count;
strLine = "";
}
objStreamWriter.Close();
objFileStream.Close();
MessageBox.Show("数据已经成功导出到：" + saveFileDialog2.FileName.ToString(), "导出完成", MessageBoxButtons.OK, MessageBoxIcon.Information);
//toolStripProgressBar1.Value = 0;
//toolStripProgressBar1.Visible = false;
}
}

}