Get property value from C# dynamic object by string (reflection?)

79

Imagine that I have a dynamic variable:

dynamic d = *something*

Now, I create properties for d which I have on the other hand from a string array:

string[] strarray = { 'property1','property2',..... }

I don't know the property names in advance.

How in code, once d is created and strarray is pulled from DB, can I get the values?

I want to get d.property1 , d.property2.

I see that the object has a _dictionary internal dictionary that contains the keys and the values, how do I retrieve them?

This question is tagged with c# reflection .net-4.0

~ Asked on 2011-12-25 20:59:31

The Best Answer is


111

I don't know if there's a more elegant way with dynamically created objects, but using plain old reflection should work:

var nameOfProperty = "property1";
var propertyInfo = myObject.GetType().GetProperty(nameOfProperty);
var value = propertyInfo.GetValue(myObject, null);

GetProperty will return null if the type of myObject does not contain a public property with this name.


EDIT: If the object is not a "regular" object but something implementing IDynamicMetaObjectProvider, this approach will not work. Please have a look at this question instead:

~ Answered on 2011-12-25 21:06:27


33

This will give you all property names and values defined in your dynamic variable.

dynamic d = { // your code };
object o = d;
string[] propertyNames = o.GetType().GetProperties().Select(p => p.Name).ToArray();
foreach (var prop in propertyNames)
{
    object propValue = o.GetType().GetProperty(prop).GetValue(o, null);
}

~ Answered on 2011-12-26 01:19:36


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