Library is available via NuGet prackage https://www.nuget.org/packages/DeepPropertyAccessor/
Inner workings of the library are explained in articles:
Access deeply nested chains of properties in a null-safe manner with optional delegate to handle (i.e. log) interrupted chains.
//...
//Or .DeepGetStruct(...)
var val = subject.DeepGet(x => x.Prop.Field.Field.Prop,
(chainUpToNull, fullChain) => {
var fullChainDescr = fullChain.ToChainDescription();
var info = $"Could not get value of {fullChainDescr}, " +
$"because position {chainUpToNull.Count} " +
$" ({chainUpToNull.Last().Name}) contained null.";
_logger.LogInfo(info);
});
//...If there are no nulls in chain - val will get final value;
Otherwise - val will be null and delegate will be called with information, how far our code got. Delegate is optional.
Currently supports fields, properties, one-dimensional array indexers and custom indexers. Arguments must be constant primitive types or captured variables of such types, as shown in demo.
//...
var dictKey = "foo";
var val = subject.DeepGet(x => x.Arr[10].Dict[dictKey].Field.Prop);
//...The following should also work, though not tested yet.
//...
var someVar = "foo";
var val = subject.DeepGet(x => x.someMethod(5,someVar).Field.Prop);
//...Secondary parameter access inside chain is not supported.
//...
// not supported
var val = subject.DeepGet(x => x.Arr[x.Fiel2.Prop2].Field.Prop);
//use this instead
var index = subject.DeepGet(x => x.Fiel2.Prop2);
var val = subject.DeepGet(x => x.Arr[index].Field.Prop);
//...