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交叉引用是指同一文档中其他地方的相关信息,我们可以创建对任何现有项目（如标题，脚注，书签，标题和编号段落）的交叉引用,本文将展示如何使用C＃和VB.NET的Spire.Doc创建书签的交叉引用。

Step 1: 创建一个文档实例。

Document doc = new Document();
Section section = doc.AddSection();

Step 2: 插入一个书签。

Paragraph paragraph = section.AddParagraph();
paragraph.AppendBookmarkStart("MyBookmark");
paragraph.AppendText("Text inside a bookmark");
paragraph.AppendBookmarkEnd("MyBookmark");

Step 3: 创建交叉引用字段，并通过书签名称将其链接到书签。

Field field = new Field(doc);
field.Type = FieldType.FieldRef;
field.Code = @"REF MyBookmark \p \h";

Step 4: 添加一个段落，并将该字段插入段落。

paragraph = section.AddParagraph();
paragraph.AppendText("For more information, see ");
paragraph.ChildObjects.Add(field);

Step 5: 将FieldSeparator对象插入到段落中，该段落在字段中用作分隔符。

FieldMark fieldSeparator= new FieldMark(doc, FieldMarkType.FieldSeparator);
paragraph.ChildObjects.Add(fieldSeparator);

Step 6: 设置交叉引用字段的显示文本。

TextRange tr = new TextRange(doc);
tr.Text = "above";
paragraph.ChildObjects.Add(tr);

Step 7: 将FieldEnd对象插入段落，该段落用于标记字段的末尾。

FieldMark fieldEnd = new FieldMark(doc, FieldMarkType.FieldEnd);
paragraph.ChildObjects.Add(fieldEnd);

Step 8: 保存到文件。

doc.SaveToFile("output.docx", FileFormat.Docx2013);

导出：交叉引用显示为将读者引用到引用项目的链接。

完整代码：

[C#]

Document doc = new Document();
Section section = doc.AddSection();
//create a bookmark
Paragraph paragraph = section.AddParagraph();
paragraph.AppendBookmarkStart("MyBookmark");
paragraph.AppendText("Text inside a bookmark");
paragraph.AppendBookmarkEnd("MyBookmark");
//insert line breaks
for (int i = 0; i < 4; i++)
{
    paragraph.AppendBreak(BreakType.LineBreak);
}        
//create a cross-reference field, and link it to bookmark                    
Field field = new Field(doc);
field.Type = FieldType.FieldRef;
field.Code = @"REF MyBookmark \p \h";
//insert field to paragraph
paragraph = section.AddParagraph();
paragraph.AppendText("For more information, see ");
paragraph.ChildObjects.Add(field);
//insert FieldSeparator object
FieldMark fieldSeparator = new FieldMark(doc, FieldMarkType.FieldSeparator);
paragraph.ChildObjects.Add(fieldSeparator);
//set display text of the field
TextRange tr = new TextRange(doc);
tr.Text = "above";
paragraph.ChildObjects.Add(tr);
//insert FieldEnd object to mark the end of the field
FieldMark fieldEnd = new FieldMark(doc, FieldMarkType.FieldEnd);
paragraph.ChildObjects.Add(fieldEnd);
//save file
doc.SaveToFile("output.docx", FileFormat.Docx2013);

[VB.NET]

Document doc = New Document()
Dim section As Section = doc.AddSection()
'create a bookmark
Dim paragraph As Paragraph = section.AddParagraph()
paragraph.AppendBookmarkStart("MyBookmark")
paragraph.AppendText("Text inside a bookmark")
paragraph.AppendBookmarkEnd("MyBookmark")
'insert line breaks
Dim i As Integer
For i = 0 To  4- 1  Step i + 1
    paragraph.AppendBreak(BreakType.LineBreak)
Next
'create a cross-reference field, and link it to bookmark                    
Dim field As Field = New Field(doc)
field.Type = FieldType.FieldRef
field.Code = "REF MyBookmark \p \h"
'insert field to paragraph
paragraph = section.AddParagraph()
paragraph.AppendText("For more information, see ")
paragraph.ChildObjects.Add(field)
'insert FieldSeparator object
Dim fieldSeparator As FieldMark = New FieldMark(doc, FieldMarkType.FieldSeparator)
paragraph.ChildObjects.Add(fieldSeparator)
'set display text of the field
Dim tr As TextRange = New TextRange(doc)
tr.Text = "above"
paragraph.ChildObjects.Add(tr)
'insert FieldEnd object to mark the end of the field
Dim fieldEnd As FieldMark = New FieldMark(doc, FieldMarkType.FieldEnd)
paragraph.ChildObjects.Add(fieldEnd)
'save file
doc.SaveToFile("output.docx", FileFormat.Docx2013)