通过反思获取列表

Question

I have some class that contains a List with a type of PropertyInfo:

public List<PropertyInfo> Properties {get; set;}

And I have an instance of that class, but it is not known which class it is at the run-time. So with that instance, in my case it's called P , I need to loop through the upper-mentioned list. Now I can get the value of the property by using:

var PropList = P.GetType().GetProperty("Properties").GetValue(this, null)

But if I try to loop through it:

foreach (var thisProp in PropList) - I get an error.

So, is there any other way to do this?

Thanks

Answer 1

You have to cast :

var PropList = P
  .GetType()
  .GetProperty("Properties")
  .GetValue(P, null) as IEnumerable<PropertyInfo>; // notice "as ..."

// Since PropList is IEnumerable<T> you can loop over it
foreach (var thisProp in PropList) {
  ...
}

since GetValue(...) alone returns object .

Answer 2

After reviewing your code it's clear that

 var PropList = P.GetType().GetProperty("Properties").GetValue(this, null)

does not return an ienumerable due to which you are getting and error. One possible solution To fix this issue you need to cast it to Ienumerable.

 var PropList = P
 .GetType()
 .GetProperty("Properties")
 .GetValue(this, null) as IEnumerable<PropertyInfo>;