Element

Sometimes it is useful to alter a document's content based on a condition. The Element component can provide the syntactic sugar needed to achieve this without breaking the fluent API chain as illustrated below:

csharp

// before
public static IContainer TableCell(this IContainer container, bool applyBackground = false)
{
    var container = container.Border(0.5f).BorderColor("#222");

    if (applyBackground)
        container = container.Background("#DEE");

    return container.Padding(5);
}

// after
public static IContainer TableCell(this IContainer container, bool applyBackground = false)
{
    return container
        .Border(0.5f)
        .BorderColor("#222")
        .Element(x => applyBackground ? x.Background("#DEE") : x)
        .Padding(5);
}

// before
public static IContainer TableCell(this IContainer container, bool applyBackground = false)
{
    var container = container.Border(0.5f).BorderColor("#222");

    if (applyBackground)
        container = container.Background("#DEE");

    return container.Padding(5);
}

// after
public static IContainer TableCell(this IContainer container, bool applyBackground = false)
{
    return container
        .Border(0.5f)
        .BorderColor("#222")
        .Element(x => applyBackground ? x.Background("#DEE") : x)
        .Padding(5);
}

It is not necessary to follow the method chain. Using this approach, you can also end the chain as shown below:

csharp

public static IContainer TextOrBackground(this IContainer container, string text)
{
    return container
        .Padding(10)
        .Element(x =>
        {
            if (string.IsNullOrWhiteSpace(text))
                x.Height(10).Width(50).Background("#DDD");
            else
                x.Text(text);
        });
}

public static IContainer TextOrBackground(this IContainer container, string text)
{
    return container
        .Padding(10)
        .Element(x =>
        {
            if (string.IsNullOrWhiteSpace(text))
                x.Height(10).Width(50).Background("#DDD");
            else
                x.Text(text);
        });
}

Element ​

Element