DocumentIterator Class

Namespace: DevExpress.XtraRichEdit.API.Native

Assembly: DevExpress.RichEdit.v19.2.Core.dll

Declaration

public class DocumentIterator :
    IEnumerator<IDocumentElement>,
    IEnumerator,
    IDisposable

Public Class DocumentIterator
    Implements IEnumerator(Of IDocumentElement),
               IEnumerator,
               IDisposable

public class DocumentIterator :
    IEnumerator<IDocumentElement>,
    IDisposable,
    IEnumerator

Public Class DocumentIterator
    Implements IEnumerator(Of IDocumentElement),
               IDisposable,
               IEnumerator

Remarks

The DocumentIterator object enables you to iterate over document elements in a specified document range. To accomplish this, create a new DocumentIterator instance and call its DocumentIterator.MoveNext method until it returns false. For each step, the current document element is obtained with the DocumentIterator.Current property.

This example creates a DocumentIterator instance for the current document and calls its DocumentIterator.MoveNext method to iterate over document elements. A Visitor pattern is implemented to process a document element. The implementation is done by calling each element's IDocumentElement.Accept method with the MyVisitor object instance as a parameter. MyVisitor object implements the IDocumentVisitor interface and overrides its IDocumentVisitor.Visit methods to perform required actions when an iterator encounters a certain document element ( an instance of the class inherited form the DocumentElementBase class).

MyVisitor visitor = new MyVisitor();
DocumentIterator iterator = new DocumentIterator(richEditControl1.Document, true);
while (iterator.MoveNext())
    iterator.Current.Accept(visitor);
memoEdit1.Text = visitor.Text;

Dim visitor As New MyVisitor()
Dim iterator As New DocumentIterator(richEditControl1.Document, True)
Do While iterator.MoveNext()
    iterator.Current.Accept(visitor)
Loop
memoEdit1.Text = visitor.Text