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    11. Working with data extracted by template

    Working with data extracted by template

    DocumentData class

    Extracted data are stored in the instance of DocumentData class:

    MemberDescription
    CountThe total number of the data fields.
    DataField ItemThe data field.
    IList GetFieldsByName(String)Returns the collection of data fields where the name is equal to field name.

    FieldData class has the following members:

    MemberDescription
    NameThe field name.
    PageIndexThe page index.
    PageAreaThe value of the field.
    LinkedFieldThe linked field.

    Field data are stored in PageArea property. Depending on the type of the value it can contain the instance of PageTextArea or PageTableArea classes:

    // Get the field data
FieldData field = data[i];
// Check if the field data contains a text
if(field.PageArea is PageTextArea)
{
    // Print the field value
    Console.WriteLine((field.PageArea as PageTextArea).Text);
}

    PageTextArea class represents a text block on the page. This class has the following members:

    MemberDescription
    RectangleThe rectangular area that bounds the text area.
    PageThe page information (page index and page size).
    TextThe value of the text area.
    BaseLineThe base line of the text area.
    TextStyleThe style of the text block (like font name, font size etc.)
    AreasThe collection of child text areas.

    The text area can be single or composite. In the first case it contains a text which is bounded by a rectangular area. In the second case it contains other text areas; text and table properties are calculated by child text areas.

    PageTableArea class represents a table. This class has the following members:

    MemberDescription
    RectangleThe rectangular area that bounds text area.
    PageThe page information (page index and page size)
    RowCountThe total number of the table rows.
    ColumnCountThe total number of the table columns.
    PageTableAreaCell ItemThe table cell by row and column indexes.
    double GetRowHeight(int)The the row height.
    double GetColumnWidth(int)Returns the column width.

    There are two ways to work with fields data.

    Iterate through fields

    The following example shows how to iterate via extracted field data:

    for (int i = 0; i < data.Count; i++) {
    Console.Write(data[i].Name + ": ");
    PageTextArea area = data[i].PageArea as PageTextArea;
    Console.WriteLine(area == null ? "Not a template field" : area.Text);
}

    Get field by name

    The following example shows how to get field by the name:

    // Get all the fields with "Address" name
IList<FieldData> addressFields = data.GetFieldsByName("Address");
if(addressFields.Count == 0) {
    Console.WriteLine("Address not found");
}
else {
    Console.WriteLine("Address");
    // Iterate over the fields collection
    for (int i = 0; i < addressFields.Count; i++) {
        PageTextArea area = addressFields[i].PageArea as PageTextArea;
        Console.WriteLine(area == null ? "Not a template field" : area.Text);        
        
        // If it's a related field:
        if(addressFields[i].LinkedField != null) {
            Console.Write("Linked to ");
            PageTextArea linkedArea = addressFields[i].LinkedField.PageArea as PageTextArea;
            Console.WriteLine(linkedArea == null ? "Not a template field" : linkedArea.Text);            
        }
    }
}

    This functionality allows to iterate all data fields and select the most suitable of them. For example, if more than one text value meets the condition of the regular expression, a user can iterate over them and select the most suitable one.

    Working with tables

    The following example shows how to work with extracted tables:

    // Print all extracted data
for (int i = 0; i < data.Count; i++)
{
    Console.Write(data[i].Name + ": ");
    // Check if the field is a table
    PageTableArea area = data[i].PageArea as PageTableArea;
    if (area == null)
    {
        continue;
    }
    // Iterate via table rows
    for (int row = 0; row < area.RowCount; row++)
    {
        // Iterate via table columns
        for (int column = 0; column < area.ColumnCount; column++)
        {
            // Get the cell value
            PageTextArea cellValue = area[row, column].PageArea as PageTextArea;
            // Print the space between columns
            if (column > 0)
            {
                Console.Write("\t");
            }
            // Print the cell value
            Console.Write(cellValue == null ? "" : cellValue.Text);
        }
        // Print a new line
        Console.WriteLine();
    }
}

    More resources

    GitHub examples

    You may easily run the code above and see the feature in action in our GitHub examples:

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