Find specific property with reflection by examining its generic type

Question

Let's say I have The class

public partial class MyEntities: DbContext { public DbSet<Customer> Customers {get;set;} public DbSet<CustomerInfo> CustomerInfos {get;set;} public DbSet<Order> Orders {get;set;} // etc }

How can I find the property that has the generic type Customer?

In other words I am looking to create the method:

 public PropertyInfo GetProperty<T>(){ var allProperties = TypeOf(MyEntities).GetProperties(); // implementation }

If I call the method as GetProperty<Customer>() then I will like to get the first property. If I call the method as GetProperty<Order>() then I will like to get the last property. How can I examine the <Type> with reflection?

McGarnagle · Accepted Answer · 2014-02-21 00:59:29Z

7

Use Type.IsGenericType and Type.GetGenericArguments():

public PropertyInfo GetProperty<T>(){ var allProperties = TypeOf(MyEntities).GetProperties(); return allProperties.FirstOrDefault(prop => prop.PropertyType.IsGenericType && prop.PropertyType.GenericTypeArguments.FirstOrDefault() == typeof(T)); }

edited Feb 21, 2014 at 0:59

answered Feb 21, 2014 at 0:23

McGarnagle

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2 Comments

Tono Nam Over a year ago

small change though I don't see the GenericTypeArguments property so I did prop.PropertyType.GetGenericArguments().FirstOrDefault()

McGarnagle Over a year ago

@TonoNam oh, I guess "GenericTypeArguments" is new in .Net 4.5. I've updated.

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