IPOI操作word的帮助类
/// <summary>
/// 创建文档
/// </summary>
/// <param name="setting"></param>
public static void ExportDocument(DocumentSetting setting)
/// <summary>
/// 设置文档
/// </summary>
public class DocumentSetting
/// <summary>
/// 文档内容相关
/// </summary>
public class ContentItemSetting
/// <summary>
/// 纸张类型
/// </summary>
public enum PaperType
/// <summary>
/// 获取纸张大小，单位：Twip
/// <para>换算关系：1英寸=1440缇 1厘米=567缇 1磅=20缇 1像素=15缇</para>
/// </summary>
/// <param name="type"></param>
/// <returns></returns>
private static Tuple<int, int> GetPaperSize(PaperType type)
