Can the watch window value of a List<> be customised?

问题

Overriding a class's ToString() is usually all you need to do to get custom formatting in the watch window, but when the class is derived from a list it doesn't seem to work.

class ListOfInts : List<int>
{
    public override string ToString()
    {
        return string.Join(",", this);
    }

    public static ListOfInts test = new ListOfInts() { 3, 4, 5 };
}

Inspecting 'test' in the watch window I get

ListOfInts.test             Count = 3   ListOfInts

and have to manually force the issue like so:

ListOfInts.test.ToString()  "3,4,5"     string

This is fine for a single list, but I have a large array of the things. Is there a way to stop the default "Count = 3" format from taking priority?

回答1:

You can use the DebuggerDisplayAttribute:

[DebuggerDisplay("{ToString()}")]
public class ListOfInts : List<int>
{
    public override string ToString()
    {
        return string.Join(",", this);
    }
}

来源：https://stackoverflow.com/questions/40040552/can-the-watch-window-value-of-a-list-be-customised