C# 导出csv文件

简单的例子，例如打印出来的是如下内容：

1，AA

2，BB

3，CC

public FileResult Excelout()

{

try

{

System.Web.HttpContext context = System.Web.HttpContext.Current;

StringBuilder sb = new StringBuilder();

// 打印内容

string exportFileName = DateTime.Now.ToString("yyyyMMddHHmmss");

sb.Append("1，AA\n");

sb.Append("2，BB\n");

sb.Append("3，CC\n");

string strPath = Server.MapPath(exportFileName + ".csv");//路径

StreamWriter sw = new StreamWriter(new FileStream(strPath, FileMode.CreateNew), Encoding.GetEncoding("GB2312"));

sw.Write(sb);

sw.Close();

string fileName = exportFileName + ".csv";//客户端保存的文件名

string filePath = Server.MapPath(fileName);//路径

return File(new FileStream(filePath, FileMode.Open), "application/ms-excel", fileName);

}

catch (Exception e)

{

return null;

}

}

}