Update

Update()

Performs the field update. Throws if the field is being updated already.

public void Update()

Examples

Shows how to insert a field into a document using FieldType.

Document doc = new Document();
DocumentBuilder builder = new DocumentBuilder(doc);

// Insert two fields while passing a flag which determines whether to update them as the builder inserts them.
// In some cases, updating fields could be computationally expensive, and it may be a good idea to defer the update.
doc.BuiltInDocumentProperties.Author = "John Doe";
builder.Write("This document was written by ");
builder.InsertField(FieldType.FieldAuthor, updateInsertedFieldsImmediately);

builder.InsertParagraph();
builder.Write("\nThis is page ");
builder.InsertField(FieldType.FieldPage, updateInsertedFieldsImmediately);

Assert.AreEqual(" AUTHOR ", doc.Range.Fields[0].GetFieldCode());
Assert.AreEqual(" PAGE ", doc.Range.Fields[1].GetFieldCode());

if (updateInsertedFieldsImmediately)
{
    Assert.AreEqual("John Doe", doc.Range.Fields[0].Result);
    Assert.AreEqual("1", doc.Range.Fields[1].Result);
}
else
{
    Assert.AreEqual(string.Empty, doc.Range.Fields[0].Result);
    Assert.AreEqual(string.Empty, doc.Range.Fields[1].Result);

    // We will need to update these fields using the update methods manually.
    doc.Range.Fields[0].Update();

    Assert.AreEqual("John Doe", doc.Range.Fields[0].Result);

    doc.UpdateFields();

    Assert.AreEqual("1", doc.Range.Fields[1].Result);
}

Shows how to format field results.

Document doc = new Document();
DocumentBuilder builder = new DocumentBuilder(doc);

// Use a document builder to insert a field that displays a result with no format applied.
Field field = builder.InsertField("= 2 + 3");

Assert.AreEqual("= 2 + 3", field.GetFieldCode());
Assert.AreEqual("5", field.Result);

// We can apply a format to a field's result using the field's properties.
// Below are three types of formats that we can apply to a field's result.
// 1 -  Numeric format:
FieldFormat format = field.Format;
format.NumericFormat = "$###.00";
field.Update();

Assert.AreEqual("= 2 + 3 \\# $###.00", field.GetFieldCode());
Assert.AreEqual("$  5.00", field.Result);

// 2 -  Date/time format:
field = builder.InsertField("DATE");
format = field.Format;
format.DateTimeFormat = "dddd, MMMM dd, yyyy";
field.Update();

Assert.AreEqual("DATE \\@ \"dddd, MMMM dd, yyyy\"", field.GetFieldCode());
Console.WriteLine($"Today's date, in {format.DateTimeFormat} format:\n\t{field.Result}");

// 3 -  General format:
field = builder.InsertField("= 25 + 33");
format = field.Format;
format.GeneralFormats.Add(GeneralFormat.LowercaseRoman);
format.GeneralFormats.Add(GeneralFormat.Upper);
field.Update();

int index = 0;
using (IEnumerator<GeneralFormat> generalFormatEnumerator = format.GeneralFormats.GetEnumerator())
    while (generalFormatEnumerator.MoveNext())
        Console.WriteLine($"General format index {index++}: {generalFormatEnumerator.Current}");

Assert.AreEqual("= 25 + 33 \\* roman \\* Upper", field.GetFieldCode());
Assert.AreEqual("LVIII", field.Result);
Assert.AreEqual(2, format.GeneralFormats.Count);
Assert.AreEqual(GeneralFormat.LowercaseRoman, format.GeneralFormats[0]);

// We can remove our formats to revert the field's result to its original form.
format.GeneralFormats.Remove(GeneralFormat.LowercaseRoman);
format.GeneralFormats.RemoveAt(0);
Assert.AreEqual(0, format.GeneralFormats.Count);
field.Update();

Assert.AreEqual("= 25 + 33  ", field.GetFieldCode());
Assert.AreEqual("58", field.Result);
Assert.AreEqual(0, format.GeneralFormats.Count);

See Also

Update(bool)

Performs a field update. Throws if the field is being updated already.

public void Update(bool ignoreMergeFormat)
ParameterTypeDescription
ignoreMergeFormatBooleanIf true then direct field result formatting is abandoned, regardless of the MERGEFORMAT switch, otherwise normal update is performed.

Examples

Shows how to preserve or discard INCLUDEPICTURE fields when loading a document.

Document doc = new Document();
DocumentBuilder builder = new DocumentBuilder(doc);

FieldIncludePicture includePicture = (FieldIncludePicture)builder.InsertField(FieldType.FieldIncludePicture, true);
includePicture.SourceFullName = ImageDir + "Transparent background logo.png";
includePicture.Update(true);

using (MemoryStream docStream = new MemoryStream())
{
    doc.Save(docStream, new OoxmlSaveOptions(SaveFormat.Docx));

    // We can set a flag in a LoadOptions object to decide whether to convert all INCLUDEPICTURE fields
    // into image shapes when loading a document that contains them.
    LoadOptions loadOptions = new LoadOptions
    {
        PreserveIncludePictureField = preserveIncludePictureField
    };

    doc = new Document(docStream, loadOptions);

    if (preserveIncludePictureField)
    {
        Assert.True(doc.Range.Fields.Any(f => f.Type == FieldType.FieldIncludePicture));

        doc.UpdateFields();
        doc.Save(ArtifactsDir + "Field.PreserveIncludePicture.docx");
    }
    else
    {
        Assert.False(doc.Range.Fields.Any(f => f.Type == FieldType.FieldIncludePicture));
    }
}

See Also

Field.Unlink