I have a class (MyData) with several properties (A, B, C). The class does not have an overridden ToString and it cannot have one for other reasons, but it has a method ToDebugString() that is also configured as “debugger display” using.

[DebuggerDisplay(nameof(ToDebugString))]
public class MyData {
  public string A {get;set;}
  public string B {get;set;}
  public string C {get;set;}
  public string ToDebugString() => $"{A}-{B}-{C}";
}

I have an assertion for a list of such objects, like this:

var items = new MyData[] { ... };
items.Should().Contain(i => i.A == "foo");

When it fails, it shows an error message like:

Expected items 
{
    MyProject.MyData
    {
        A = "a1", 
        B = "b1", 
        C = "c1"
    }
} to have an item matching (i.A == "foo"). (0.2s)

That is pretty verbose especially if you have many items in the list.

When I define a ToString method, it is used by FluentAssertions and the output is much more condensed, but I cannot do that for the class.

My question is how could I configure FluentAssertions to use my ToDebugString method to log the objects or is there a way to generally use the method that is configured as DebuggerDisplay?