datatable转excel（转）

/// <summary>
/// Datatable生成Excel表格并返回路径
/// </summary>
/// <param name="m_DataTable">Datatable</param>
/// <param name="s_FileName">文件名</param>
/// <returns></returns>
public string DataToExcel(System.Data.DataTable m_DataTable, string s_FileName)
{
string FileName = AppDomain.CurrentDomain.BaseDirectory + s_FileName + ".xls"; //文件存放路径
if (System.IO.File.Exists(FileName)) //存在则删除
{
System.IO.File.Delete(FileName);
}
System.IO.FileStream objFileStream;
System.IO.StreamWriter objStreamWriter;
string strLine = "";
objFileStream = new System.IO.FileStream(FileName, System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.Write);
objStreamWriter = new System.IO.StreamWriter(objFileStream, Encoding.Unicode);
for (int i = 0; i < m_DataTable.Columns.Count; i++)
{
strLine = strLine + m_DataTable.Columns[i].Caption.ToString() + Convert.ToChar(9); //写列标题
}
objStreamWriter.WriteLine(strLine);
strLine = "";
for (int i = 0; i < m_DataTable.Rows.Count; i++)
{
for (int j = 0; j < m_DataTable.Columns.Count; j++)
{
if (m_DataTable.Rows[i].ItemArray[j] == null)
strLine = strLine + " " + Convert.ToChar(9); //写内容
else
{
string rowstr = "";
rowstr = m_DataTable.Rows[i].ItemArray[j].ToString();
if (rowstr.IndexOf("\r\n") > 0)
rowstr = rowstr.Replace("\r\n", " ");
if (rowstr.IndexOf("\t") > 0)
rowstr = rowstr.Replace("\t", " ");
strLine = strLine + rowstr + Convert.ToChar(9);
}
}
objStreamWriter.WriteLine(strLine);
strLine = "";
}
objStreamWriter.Close();
objFileStream.Close();
return FileName; //返回生成文件的绝对路径
}