当需要将许多书签插入长字文档时，变可以使用Spire.Doc添加多个级别的书签并为其设置不同的颜色。Spire.Doc版本5.5.71添加了一种新的BookmarkLayout方法，使开发人员能够为不同级别的书签设置不同的颜色。

代码段：

Step 1: 创建一个新的单词文档并加载具有嵌套级别书签的文件。

Document document = new Document();
document.LoadFromFile("sample.docx");

Step 2:将单词文档保存为PDF，以清晰地查看效果，并在保存为PDF之前添加BookmarkLayout的事件。

ToPdfParameterList toPdf = new ToPdfParameterList();
toPdf.CreateWordBookmarks = true;
toPdf.WordBookmarksTitle = "Changed bookmark";
toPdf.WordBookmarksColor = Color.Gray;
//the event of BookmarkLayout occurs when draw a bookmark
document.BookmarkLayout += new Spire.Doc.Documents.Rendering.BookmarkLevelHandler(document_BookmarkLayout);
document.SaveToFile("result.pdf", toPdf);

Step 3:调用BookmarkLayout的方法为不同级别的书签设置不同的颜色。

static void document_BookmarkLayout(object sender, Spire.Doc.Documents.Rendering.BookmarkLevelEventArgs args)
{
    //set the different color for different levels of bookmarks
    if (args.BookmarkLevel.Level == 2)
    {
        args.BookmarkLevel.Color = Color.Red;
        args.BookmarkLevel.Style = BookmarkTextStyle.Bold;
    }
    else if (args.BookmarkLevel.Level == 3)
    {
        args.BookmarkLevel.Color = Color.Gray;
        args.BookmarkLevel.Style = BookmarkTextStyle.Italic;
    }
    else
    {
        args.BookmarkLevel.Color = Color.Green;
        args.BookmarkLevel.Style = BookmarkTextStyle.Regular;

检查不同颜色多级书签的效果截图：

完整代码：

class Program
{
    static void Main(string[] args)
    {
        Document document = new Document();
        document.LoadFromFile("sample.docx");
        ToPdfParameterList toPdf = new ToPdfParameterList();
        toPdf.CreateWordBookmarks = true;
        toPdf.WordBookmarksTitle = "Changed bookmark";
        toPdf.WordBookmarksColor = Color.Gray;
        //the event of BookmarkLayout occurs when draw a bookmark
        document.BookmarkLayout += new Spire.Doc.Documents.Rendering.BookmarkLevelHandler(document_BookmarkLayout);
        document.SaveToFile("result.pdf", toPdf);
    }
    static void document_BookmarkLayout(object sender, Spire.Doc.Documents.Rendering.BookmarkLevelEventArgs args)
    {
        if (args.BookmarkLevel.Level == 2)
        {
            args.BookmarkLevel.Color = Color.Red;
            args.BookmarkLevel.Style = BookmarkTextStyle.Bold;
        }
        else if (args.BookmarkLevel.Level == 3)
        {
            args.BookmarkLevel.Color = Color.Gray;
            args.BookmarkLevel.Style = BookmarkTextStyle.Italic;
        }
        else
        {
            args.BookmarkLevel.Color = Color.Green;
            args.BookmarkLevel.Style = BookmarkTextStyle.Regular;
        }
      }
  }

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