Help needed with customizing Dump

Henk · February 2022

I want to customize Dump for the following class:

void Main()
{
    var list = new List<AggregateRanking> {
        new AggregateRanking { A=3, B=0, C=1, D=6},
        new AggregateRanking { A=30M, B=0, C=10, D=60, AsPercentage = true },
    };

    list.Dump(noTotals: true);
}

// You can define other methods, fields, classes and namespaces here
public record AggregateRanking
{
    public decimal A { get; set; }
    public decimal B { get; set; }
    public decimal C { get; set; }
    public decimal D { get; set; }

    public decimal Total => A + B + C + D;

    public bool AsPercentage { get; set; }

    object ToDump() => Util.ToExpando(this, exclude: nameof(AsPercentage));
}

This currently is dumped as:

AΞΞ	BΞΞ	CΞΞ	DΞΞ	TotalΞΞ
3	0	1	6	10
30	0	10	60	100

What I would like to have:

AΞΞ	BΞΞ	CΞΞ	DΞΞ	TotalΞΞ
3	0	1	6	10
30 %	0 %	10 %	60 %	100 %

So aligned right and with the percentage sign added if the property AsPercentage is true.

How do I do this? Because if I convert the columns to strings, they get aligned to the left.

Thanks in advance!

JoeAlbahari · February 2022

For now, you can do the following (although you will lose the auto-graphing option):

object ToDump()
{
    IDictionary<string, object> expando = Util.ToExpando (this, exclude: nameof (AsPercentage));
    foreach (var column in expando.ToArray())
        if (column.Value is decimal d)
            expando [column.Key] = Util.WithStyle (d.ToString() + "%", "float:right");
    return expando;
}

The next LINQPad beta will allow this (which will preserve the auto-graphing option):

object ToDump()
{
    Util.HtmlHead.AddStyles (".percent::after { content:'%'; }");  // (It's OK to call this multiple times)
    IDictionary<string, object> expando = Util.ToExpando (this, exclude: nameof (AsPercentage));
    foreach (var column in expando.ToArray())
        if (column.Value is decimal d)
            expando [column.Key] = Util.WithCssClass (d, "percent");
    return expando;
}

Henk · February 2022

Thank you very much!

Changed it a bit:

    object ToDump()
    {
        IDictionary<string, object> expando = Util.ToExpando(this, exclude: nameof(AsPercentage));
        if (this.AsPercentage)
        {
            foreach (var column in expando.ToArray())
            {
                if (column.Value is decimal d)
                {
                    expando[column.Key] = Util.WithStyle(d.ToString() + " %", "float:right");
                }
            }
        }
        return expando;
    }

It now does exactly what I wanted.

Only the line

IDictionary<string, object> expando = Util.ToExpando(this, exclude: nameof(AsPercentage));

gives a warning:
Warning: CS8619 Nullability of reference types in value of type 'ExpandoObject' doesn't match target type 'IDictionary<string, object>'.

For now I ignore it...

JoeAlbahari · February 2022

If you have nullable reference types enabled, change IDictionary<string,object> to IDictionary<string,object?> to avoid the warning.

Help needed with customizing Dump

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