花了一些时间将PDF对象也整理好了！

 public static void CreateFile(string strFile, bool blTriggerThrow)

    {

        if (File.Exists(strFile) && blTriggerThrow)

        {

            throw new Exception(ErrorString.strFileOn);

        }

        File.Create(strFile);

    }



    /// <summary>

    /// 删除文件

    /// </summary>

    /// <param name="strFile">文件地址</param>

    public static void DeleteFile(string strFile)

    {

        if (!File.Exists(strFile))

        {

            throw new Exception(ErrorString.strFileOff);

        }

        File.Delete(strFile);

    }



    /// <summary>

    /// 重命名文件

    /// </summary>

    /// <param name="strFile">传入文件地址</param>

    /// <param name="strName">输入新的文件名</param>

    public static void RenameFile(string strFile, string strName)

    {

        File.Move(strFile, Path.GetDirectoryName(strFile) + "//" + strName);

    }



    /// <summary>

    /// 清空文件

    /// </summary>

    /// <param name="strFile">传入文件地址</param>

    public static void TruncateFile(string strFile)

    {

        DeleteFile(strFile);

        CreateFile(strFile, false);

    }



    /// <summary>

    /// 复制文件

    /// </summary>

    /// <param name="strFile">传入文件地址</param>

    /// <param name="strFile2">传入目标文件地址</param>

    public static void CopyFile(string strFile, string strFile2)

    {

        File.Copy(strFile, strFile2);

    }

    /// <summary>

    /// 内部私有对象给Image赋值

    /// </summary>

    /// <param name="strAlt">传入图片描述</param>

    /// <param name="width">长度(如果为0那么使用图片本身的长度)</param>

    /// <param name="hegiht">高度(如果为0那么使用图片本身的高度)</param>

    /// <param name="x">X轴距离</param>

    /// <param name="y">Y轴距离</param>

    /// <param name="rotation">旋转度数</param>

    /// <param name="align">图片对其方式</param>

    private static void SetImage(string strAlt, float width, float hegiht, float x, float y, float rotation, int align, ref Image img)

    {

        img.Alt = strAlt;

        if (width <= 0)

        {

            img.ScaleAbsoluteWidth(img.Width);

        }

        else

        {

            img.ScaleAbsoluteWidth(width);

        }

        if (hegiht <= 0)

        {

            img.ScaleAbsoluteHeight(img.Height);

        }

        else

        {

            img.ScaleAbsoluteHeight(hegiht);

        }

        if (x != 0 || y != 0)

        {

            img.SetAbsolutePosition(x, y);

        }

        else

        {

            img.Alignment = align;

        }

        img.Rotation = rotation;



    }



    /// <summary>

    /// 返回一个基本的图片对象

    /// </summary>

    /// <param name="strImg">传入图片地址</param>

    /// <param name="strAlt">传入图片描述</param>

    /// <param name="width">长度高度(如果为0那么使用图片本身的长度)</param>

    /// <param name="hegiht">高度高度(如果为0那么使用图片本身的高度)</param>

    /// <param name="x">X轴距离</param>

    /// <param name="y">Y轴距离</param>

    /// <param name="rotation">旋转度数</param>

    /// <param name="align">图片对其方式</param>

    /// <returns></returns>

    public static Image GetImages(string strImg, string strAlt, float width, float hegiht, float x, float y, float rotation, Alignment align)

    {

        Image img = Image.GetInstance(strImg);

         SetImage(strAlt, width, hegiht, x, y, rotation, (int)align, ref img);

        return img;

    }



    /// <summary>

    /// 返回一个基本的图片对象

    /// </summary>

    /// <param name="strImg">传入图片字节</param>

    /// <param name="strAlt">传入图片描述</param>

    /// <param name="width">长度高度(如果为0那么使用图片本身的长度)</param>

    /// <param name="hegiht">高度高度(如果为0那么使用图片本身的高度)</param>

    /// <param name="x">X轴距离</param>

    /// <param name="y">Y轴距离</param>

    /// <param name="rotation">旋转度数</param>

    /// <param name="align">对其方式</param>

    /// <returns></returns>

    public static Image GetImages(byte[] btImg, string strAlt, int width, int hegiht, float x, float y, float rotation, Alignment align)

    {

        Image img = Image.GetInstance(btImg);

        SetImage(strAlt, width, hegiht, x, y, rotation, (int)align, ref img);

        return img;

    }





    /// <summary>

    /// 建立一个块

    /// </summary>

    /// <param name="strContent">输入内容</param>

    /// <param name="font">字体</param>

    /// <param name="bgColor">背景颜色</param>

    /// <returns></returns>

    public static Chunks GetChunks(string strContent, Fonts font, ColorList bgColor)

    {

        if (font == null)

        {

            font = new Fonts();

        }

        Chunks ck = new Chunks(strContent, font);

        ck.SetBackground(bgColor);

        return ck;

    }



    /// <summary>

    /// 建立短语

    /// </summary>

    /// <param name="strContent">内容</param>

    /// <param name="font">字体</param>

    /// <returns></returns>

    public static Phrases GetPhrases(string strContent, Fonts font)

    {

        if (font == null)

        {

            font = new Fonts();

        }

        Phrases ph = new Phrases(strContent, font);

        return ph;

    }



    /// <summary>

    /// 建立一个段落

    /// </summary>

    /// <param name="strContent">内容</param>

    /// <param name="font">字体</param>

    /// <param name="align">对其方式</param>

    /// <returns></returns>

    public static Paragraphs GetParagraphs(string strContent, Fonts font, Alignment align)

    {

        if (font == null)

        {

            font = new Fonts();

        }

        Paragraphs pg = new Paragraphs(strContent, font);

        pg.Alignment = (int)align;

        return pg;

    }



    /// <summary>

    /// 建立一个章节

    /// </summary>

    /// <param name="title">章节名称</param>

    /// <param name="number">编号</param>

    /// <param name="content">章节内容</param>

    /// <returns></returns>

    public static Chapters GetChapter(Paragraphs title, int number, params Paragraphs[] content)

    {

        Chapters cp = new Chapters(title, number);

        cp.AddAll(content);

        return cp;

    }



    /// <summary>

    /// 建立一个节点

    /// </summary>

    /// <param name="title">节点名称</param>

    /// <param name="number">编号</param>

    /// <param name="content">节点内容</param>

    /// <returns></returns>

    public static Sections GetSection(Paragraphs title, int number, params Paragraphs[] content)

    {

        Sections section = new Sections(title, number);

        section.AddAll(content);

        return section;

    }