C#•2y ago

❔ how to set a dynamic's property of a unknown name

if i have var dyn = new dynamic and i have string variableName = "toto" how can i set dyn.variableName = "hello" for example. the thing is variableName could be anything and I then want to be able to access it by calling for example dyn.toto if that was the name used for that property

16 Replies

LPeter1997•2y ago

If you are 100% sure you need this, you could take a look at https://learn.microsoft.com/en-us/dotnet/api/system.dynamic.expandoobject?view=net-7.0

Axiss•2y ago

It really depends on if you are controlling the creation of the object. If you are getting an object passed in that you don't control, you probably should look into Reflection and not dynamic.

LPeter1997•2y ago

In general... Likely a bad idea, but there are 1 in 10000000 situations where it has legit use 😄 But if it's just curiosity, then expando-object it is

PatrickGOP•2y ago

i didnt see in the expando docs anywhere where they create a property with a variable name

Thinker•2y ago

You might want a dictionary instead

PatrickGOP•2y ago

lol yea dictionary might be the way to go

Thinker•2y ago

With a dictionary, you could do dict["todo"] = something; and then dict["todo"] to get the value

PatrickGOP•2y ago

yea, i was starting to fall into a pit of toughts but yea dictionary should do the trick

ero•2y ago

that's what expandoobject is internally IDictionary<string, dynamic>, i think

Axiss•2y ago

https://dotnetfiddle.net/iaI9Ia

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Axiss•2y ago

that, but yeah it's really just a dictionary

MODiX•2y ago

Ero#1111

REPL Result: Success

dynamic expando = new ExpandoObject();
expando.Foo = "Bar";
expando.Qux = 123;

(expando.Foo, expando.Qux)

dynamic expando = new ExpandoObject();
expando.Foo = "Bar";
expando.Qux = 123;

(expando.Foo, expando.Qux)

Result: ValueTuple<object, object>

{
  "item1": "Bar",
  "item2": 123
}

{
  "item1": "Bar",
  "item2": 123
}

Compile: 496.572ms | Execution: 100.436ms | React with ❌ to remove this embed.

PatrickGOP•2y ago

alright thanks

LPeter1997•2y ago

LPeter1997•2y ago

So you'd do it like this with expando, as I think the interface impl is explicit for IDictionary The key is, you can use it like a dictionary, but you have to explicitly cast it to an IDictionary<string, object>

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ how to set a dynamic's property of a unknown name