Aspose.Words insert nested fields programmatically

I need to insert nested fields programmatically. Here is a sample:
{ IF { MERGEFIELD MY_FIELD } = TRUE { MERGEFIELD MY_TRUE } { MERGEFIELD MY_FALSE } }
or
{ = { PAGE } # 00 }
One way of inserting fields is to use DocumentBuilder.InsertField(""). But this API is not enough to insert the nested Field. Could you please direct me to an API I could use or a workaround.

Hi there,

Thanks for your inquiry.

You can use the code like below to insert fields nested with an IF field.

Document doc = new Document();
DocumentBuilder builder = new DocumentBuilder(doc);
// Insert a few page breaks (just for testing)
for (int i = 0; i <5; i++)
    builder.InsertBreak(BreakType.PageBreak);
// Move the DocumentBuilder cursor into the primary footer.
builder.MoveToHeaderFooter(HeaderFooterType.FooterPrimary);
// We want to insert a field like this:
// { IF {PAGE} <> {NUMPAGES} "See Next Page" "Last Page" }
Field field = builder.InsertField(@"IF ");
builder.MoveTo(field.Separator);
builder.InsertField("PAGE");
builder.Write(" <> ");
builder.InsertField("NUMPAGES");
builder.Write(" \"See Next Page\" \"Last Page\" ");
// Finally update the outer field to recalcaluate the final value. Doing this will automatically update
// the inner fields at the same time.
field.Update();

Thanks,