How to dynamically get a property by name from a C# ExpandoObject?
ExpandoObject
provides access both via dynamic
and via IDictionary<string,object>
- so you could just use the dictionary API:
var byName = (IDictionary<string,object>)account.features;
bool val = (bool)byName["isEmailEnabled"];
Or if the name is fixed, just:
bool val = ((dynamic)account).features.isEmailEnabled;
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user2838966
Updated on October 03, 2020Comments
-
user2838966 over 3 years
I have an
ExpandoObject
and want to make a getter for it that will return a property by name at runtime, where the name is specified in a string instead of hardcoded.For example, I CAN do this:
account.features.isEmailEnabled;
and that will return true.
account
is aExpandoObject
, andfeatures
is also anExpandoObject
. So I have anExpandoObject
that contains otherExpandoObjects
.So what I want to be able to do is this:
account.features.GetProperty("isEmailEnabled");
and have that return true.
The reason is that I have many features, and I want to be able to write one generic getter method where I can pass in the name of the feature I want, and the method will pass me back the value for account.features.whatever (where "whatever" is specified by passing in a string to the generic getter method). Otherwise I am going to have to write 30-some getters one for each feature.
I did a lot of research and tried doing something like:
var prop = account.features.GetType(); // this returns System.Dyanmic.ExpandoObject
followed by
var value = prop.GetProperty(featureNameAsString);
but
value
always comes back as null. I don't understand why. In the watch window I can doaccount.features.isEmailEnabled
and it shows true and says its a boolean. But if I try to get at this value using the approach above and pass inisEmailEnabled
as thefeatureNameAsString
I just get null.Can someone please tell me what I may be doing wrong and what's a good approach, without it being too complex?
I am working with ASP.NET under the 4.5.1 framework.