FieldToa class

Implements the TOA field.

To learn more, visit the Working with Fields documentation article.

public class FieldToa : Field


FieldToa()The default constructor.


BookmarkName { get; set; }Gets or sets the name of the bookmark that marks the portion of the document used to build the table.
DisplayResult { get; }Gets the text that represents the displayed field result.
End { get; }Gets the node that represents the field end.
EntryCategory { get; set; }Gets or sets the integral category for entries included in the table.
EntrySeparator { get; set; }Gets or sets the character sequence that is used to separate a table of authorities entry and its page number.
Format { get; }Gets a FieldFormat object that provides typed access to field’s formatting.
IsDirty { get; set; }Gets or sets whether the current result of the field is no longer correct (stale) due to other modifications made to the document.
IsLocked { get; set; }Gets or sets whether the field is locked (should not recalculate its result).
LocaleId { get; set; }Gets or sets the LCID of the field.
PageNumberListSeparator { get; set; }Gets or sets the character sequence that is used to separate two page numbers in a page number list.
PageRangeSeparator { get; set; }Gets or sets the character sequence that is used to separate the start and end of a page range.
RemoveEntryFormatting { get; set; }Gets or sets whether to remove the formatting of the entry text in the document from the entry in the table of authorities.
Result { get; set; }Gets or sets text that is between the field separator and field end.
Separator { get; }Gets the node that represents the field separator. Can be null.
SequenceName { get; set; }Gets or sets the name of a sequence whose number is included with the page number.
SequenceSeparator { get; set; }Gets or sets the character sequence that is used to separate sequence numbers and page numbers.
Start { get; }Gets the node that represents the start of the field.
virtual Type { get; }Gets the Microsoft Word field type.
UseHeading { get; set; }Gets or sets whether to include the category heading for the entries in a table of authorities.
UsePassim { get; set; }Gets or sets whether to replace five or more different page references to the same authority with “passim”, which is used to indicate that a word or passage occurs frequently in the work cited.


GetFieldCode()Returns text between field start and field separator (or field end if there is no separator). Both field code and field result of child fields are included.
GetFieldCode(bool)Returns text between field start and field separator (or field end if there is no separator).
Remove()Removes the field from the document. Returns a node right after the field. If the field’s end is the last child of its parent node, returns its parent paragraph. If the field is already removed, returns null.
Unlink()Performs the field unlink.
Update()Performs the field update. Throws if the field is being updated already.
Update(bool)Performs a field update. Throws if the field is being updated already.


Builds a table of authorities (that is, a list of the references in a legal document, such as references to cases, statutes, and rules, along with the numbers of the pages on which the references appear) using the entries specified by TA fields.


Shows how to build and customize a table of authorities using TOA and TA fields.

public void FieldTOA()
    Document doc = new Document();
    DocumentBuilder builder = new DocumentBuilder(doc);

    // Insert a TOA field, which will create an entry for each TA field in the document,
    // displaying long citations and page numbers for each entry.
    FieldToa fieldToa = (FieldToa)builder.InsertField(FieldType.FieldTOA, false);

    // Set the entry category for our table. This TOA will now only include TA fields
    // that have a matching value in their EntryCategory property.
    fieldToa.EntryCategory = "1";

    // Moreover, the Table of Authorities category at index 1 is "Cases",
    // which will show up as our table's title if we set this variable to true.
    fieldToa.UseHeading = true;

    // We can further filter TA fields by naming a bookmark that they will need to be within the TOA bounds.
    fieldToa.BookmarkName = "MyBookmark";

    // By default, a dotted line page-wide tab appears between the TA field's citation
    // and its page number. We can replace it with any text we put on this property.
    // Inserting a tab character will preserve the original tab.
    fieldToa.EntrySeparator = " \t p.";

    // If we have multiple TA entries that share the same long citation,
    // all their respective page numbers will show up on one row.
    // We can use this property to specify a string that will separate their page numbers.
    fieldToa.PageNumberListSeparator = " & p. ";

    // We can set this to true to get our table to display the word "passim"
    // if there are five or more page numbers in one row.
    fieldToa.UsePassim = true;

    // One TA field can refer to a range of pages.
    // We can specify a string here to appear between the start and end page numbers for such ranges.
    fieldToa.PageRangeSeparator = " to ";

    // The format from the TA fields will carry over into our table.
    // We can disable this by setting the RemoveEntryFormatting flag.
    fieldToa.RemoveEntryFormatting = true;
    builder.Font.Color = Color.Green;
    builder.Font.Name = "Arial Black";

    Assert.AreEqual(" TOA  \\c 1 \\h \\b MyBookmark \\e \" \t p.\" \\l \" & p. \" \\p \\g \" to \" \\f", fieldToa.GetFieldCode());


    // This TA field will not appear as an entry in the TOA since it is outside
    // the bookmark's bounds that the TOA's BookmarkName property specifies.
    FieldTA fieldTA = InsertToaEntry(builder, "1", "Source 1");

    Assert.AreEqual(" TA  \\c 1 \\l \"Source 1\"", fieldTA.GetFieldCode());

    // This TA field is inside the bookmark,
    // but the entry category does not match that of the table, so the TA field will not include it.
    fieldTA = InsertToaEntry(builder, "2", "Source 2");

    // This entry will appear in the table.
    fieldTA = InsertToaEntry(builder, "1", "Source 3");

    // A TOA table does not display short citations,
    // but we can use them as a shorthand to refer to bulky source names that multiple TA fields reference.
    fieldTA.ShortCitation = "S.3";

    Assert.AreEqual(" TA  \\c 1 \\l \"Source 3\" \\s S.3", fieldTA.GetFieldCode());

    // We can format the page number to make it bold/italic using the following properties.
    // We will still see these effects if we set our table to ignore formatting.
    fieldTA = InsertToaEntry(builder, "1", "Source 2");
    fieldTA.IsBold = true;
    fieldTA.IsItalic = true;

    Assert.AreEqual(" TA  \\c 1 \\l \"Source 2\" \\b \\i", fieldTA.GetFieldCode());

    // We can configure TA fields to get their TOA entries to refer to a range of pages that a bookmark spans across.
    // Note that this entry refers to the same source as the one above to share one row in our table.
    // This row will have the page number of the entry above and the page range of this entry,
    // with the table's page list and page number range separators between page numbers.
    fieldTA = InsertToaEntry(builder, "1", "Source 3");
    fieldTA.PageRangeBookmarkName = "MyMultiPageBookmark";


    Assert.AreEqual(" TA  \\c 1 \\l \"Source 3\" \\r MyMultiPageBookmark", fieldTA.GetFieldCode());

    // If we have enabled the "Passim" feature of our table, having 5 or more TA entries with the same source will invoke it.
    for (int i = 0; i < 5; i++)
        InsertToaEntry(builder, "1", "Source 4");


    doc.Save(ArtifactsDir + "Field.TOA.TA.docx");

private static FieldTA InsertToaEntry(DocumentBuilder builder, string entryCategory, string longCitation)
    FieldTA field = (FieldTA)builder.InsertField(FieldType.FieldTOAEntry, false);
    field.EntryCategory = entryCategory;
    field.LongCitation = longCitation;


    return field;

See Also