/// <summary>
/// 序列为CSV，并写入文件（如果文件已存在，则截断为零）
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="val"></param>
/// <param name="fileName"></param>
public static void SerializeToStream <T>(T val, string fileName)
{
FileHelp.Write <T>(val, fileName);
}
