由Datatable生成 csv 文件

public void ExportToCsv(System.Data.DataTable dt, string strFileName)
{
//strFileName，"d:\test\test.csv"
CommonF cf = new CommonF();
//string strPath = Server.MapPath(strFileName).ToString();
string strPath = strFileName;
//Response.Write(strPath);
//Response.End();
if (File.Exists(strPath))
{
File.Delete(strPath);
}
//else {
//    Response.Write("Hello");
//    return;
//}
//Export Head
StringBuilder strColu = new StringBuilder();
StringBuilder strValue = new StringBuilder();
int i = 0;
try
{
StreamWriter sw = new StreamWriter(new FileStream(strPath, FileMode.CreateNew), Encoding.GetEncoding("iso-8859-1"));

for (i = 0; i <= dt.Columns.Count - 1; i++)
{
strColu.Append(dt.Columns[i].ColumnName);

strColu.Append(",");
}
strColu.Remove(strColu.Length - 1, 1);//Remove last ','
strColu = cf.StringReplace_Out(strColu, site);
sw.WriteLine(strColu);

foreach (DataRow dr in dt.Rows)
{
strValue.Remove(0, strValue.Length);//remove

for (i = 0; i <= dt.Columns.Count - 1; i++)
{
strValue.Append(dr[i].ToString());
strValue.Append(",");
}
strValue.Remove(strValue.Length - 1, 1);//Remove last ','
sw.WriteLine(strValue);
}

sw.Close();
}
catch (Exception ex)
{
throw ex;
}
////System.Diagnostics.Process.Start(strPath);
}