How to get a Static property with Reflection

Question

So this seems pretty basic but I can t get it to work   I have an Object  and I am using reflection to get to it s public properties   One of these properties is static and I m having no luck getting to it   Public Function GetProp ByRef obj As Object  ByVal propName as String  as PropertyInfo     Return obj GetType GetProperty propName   End Function   The above code works fine for Public Instance properties  which up until now is all that I have needed   Supposedly I can use BindingFlags to request other types of properties  private  static   but I can t seem to find the right combination   Public Function GetProp ByRef obj As Object  ByVal propName as String  as PropertyInfo     Return obj GetType GetProperty propName  Reflection BindingFlags Static Or Reflection BindingFlags Instance Or Reflection BindingFlags Public   End Function   But still  requesting any Static members return nothing    NET reflector can see the static properties just fine  so clearly I am missing something here

User · Answer

myType GetProperties BindingFlags Public   BindingFlags Static    BindingFlags FlattenHierarchy     This will return all static properties in static base class or a particular type and probably the child as well

User · Answer

Try this C  Reflection link   Note I think that BindingFlags Instance and BindingFlags Static are exclusive

User · Answer

The below seems to work for me   using System  using System Reflection   public class ReflectStatic       private static int SomeNumber  get  set       public static object SomeReference  get  set       static ReflectStatic                 SomeReference   new object            Console WriteLine SomeReference GetHashCode              public class Program       public static void Main                 var rs   new ReflectStatic            var pi   rs GetType   GetProperty  SomeReference    BindingFlags Static   BindingFlags Public           if pi    null    Console WriteLine  Null     Environment Exit 0            Console WriteLine pi GetValue rs  null  GetHashCode

User · Answer

The below seems to work for me   using System  using System Reflection   public class ReflectStatic       private static int SomeNumber  get  set       public static object SomeReference  get  set       static ReflectStatic                 SomeReference   new object            Console WriteLine SomeReference GetHashCode              public class Program       public static void Main                 var rs   new ReflectStatic            var pi   rs GetType   GetProperty  SomeReference    BindingFlags Static   BindingFlags Public           if pi    null    Console WriteLine  Null     Environment Exit 0            Console WriteLine pi GetValue rs  null  GetHashCode

User · Answer

Try this C  Reflection link   Note I think that BindingFlags Instance and BindingFlags Static are exclusive

User · Answer

Ok so the key for me was to use the  FlattenHierarchy BindingFlag   I don t really know why I just added it on a hunch and it started working   So the final solution that allows me to get Public Instance or Static Properties is   obj GetType GetProperty propName  Reflection BindingFlags Public     Or Reflection BindingFlags Static Or Reflection BindingFlags Instance Or     Reflection BindingFlags FlattenHierarchy

User · Answer

This is C   but should give you the idea   public static void Main         typeof Program  GetProperty  GetMe   BindingFlags NonPublic   BindingFlags Static      private static int GetMe       get   return 0         you need to OR NonPublic and Static only

User · Answer

Ok so the key for me was to use the  FlattenHierarchy BindingFlag   I don t really know why I just added it on a hunch and it started working   So the final solution that allows me to get Public Instance or Static Properties is   obj GetType GetProperty propName  Reflection BindingFlags Public     Or Reflection BindingFlags Static Or Reflection BindingFlags Instance Or     Reflection BindingFlags FlattenHierarchy

User · Answer

Or just look at this     Type type   typeof MyClass      MyClass is static class with static properties foreach  var p in type GetProperties         var v   p GetValue null  null      static classes cannot be instanced  so use null

User · Answer

This is C   but should give you the idea   public static void Main         typeof Program  GetProperty  GetMe   BindingFlags NonPublic   BindingFlags Static      private static int GetMe       get   return 0         you need to OR NonPublic and Static only

User · Answer

This is C   but should give you the idea   public static void Main         typeof Program  GetProperty  GetMe   BindingFlags NonPublic   BindingFlags Static      private static int GetMe       get   return 0         you need to OR NonPublic and Static only

User · Answer

Try this C  Reflection link   Note I think that BindingFlags Instance and BindingFlags Static are exclusive

User · Answer

Ok so the key for me was to use the  FlattenHierarchy BindingFlag   I don t really know why I just added it on a hunch and it started working   So the final solution that allows me to get Public Instance or Static Properties is   obj GetType GetProperty propName  Reflection BindingFlags Public     Or Reflection BindingFlags Static Or Reflection BindingFlags Instance Or     Reflection BindingFlags FlattenHierarchy

User · Answer

Just wanted to clarify this for myself  while using the new reflection API based on TypeInfo - where BindingFlags is not available reliably  depending on target framework    In the  new  reflection  to get the static properties for a type  not including base class es   you have to do something like   IEnumerable lt PropertyInfo gt  props      type GetTypeInfo   DeclaredProperties Where p   gt        p GetMethod    null  amp  amp  p GetMethod IsStatic          p SetMethod    null  amp  amp  p SetMethod IsStatic      Caters for both read-only or write-only properties  despite write-only being a terrible idea    The DeclaredProperties member  too doesn t distinguish between properties with public private accessors - so to filter around visibility  you then need to do it based on the accessor you need to use   E g - assuming the above call has returned  you could do   var publicStaticReadable   props Where p   gt  p GetMethod    null  amp  amp  p GetMethod IsPublic     There are some shortcut methods available - but ultimately we re all going to be writing a lot more extension methods around the TypeInfo query methods properties in the future   Also  the new API forces us to think about exactly what we think of as a  private  or  public  property from now on - because we must filter ourselves based on individual accessors

User · Answer

The below seems to work for me   using System  using System Reflection   public class ReflectStatic       private static int SomeNumber  get  set       public static object SomeReference  get  set       static ReflectStatic                 SomeReference   new object            Console WriteLine SomeReference GetHashCode              public class Program       public static void Main                 var rs   new ReflectStatic            var pi   rs GetType   GetProperty  SomeReference    BindingFlags Static   BindingFlags Public           if pi    null    Console WriteLine  Null     Environment Exit 0            Console WriteLine pi GetValue rs  null  GetHashCode

User · Answer

The below seems to work for me   using System  using System Reflection   public class ReflectStatic       private static int SomeNumber  get  set       public static object SomeReference  get  set       static ReflectStatic                 SomeReference   new object            Console WriteLine SomeReference GetHashCode              public class Program       public static void Main                 var rs   new ReflectStatic            var pi   rs GetType   GetProperty  SomeReference    BindingFlags Static   BindingFlags Public           if pi    null    Console WriteLine  Null     Environment Exit 0            Console WriteLine pi GetValue rs  null  GetHashCode

User · Answer

Try this C  Reflection link   Note I think that BindingFlags Instance and BindingFlags Static are exclusive

User · Answer

A little clarity        Get a PropertyInfo of specific property type T  GetProperty       PropertyInfo propertyInfo  propertyInfo   typeof TypeWithTheStaticProperty       GetProperty  NameOfStaticProperty   BindingFlags Public   BindingFlags Static        Use the PropertyInfo to retrieve the value from the type by not passing in an instance object value   propertyInfo GetValue null  null       Cast the value to the desired type ExpectedType typedValue    ExpectedType  value

User · Answer

Or just look at this     Type type   typeof MyClass      MyClass is static class with static properties foreach  var p in type GetProperties         var v   p GetValue null  null      static classes cannot be instanced  so use null

User · Answer

This is C   but should give you the idea   public static void Main         typeof Program  GetProperty  GetMe   BindingFlags NonPublic   BindingFlags Static      private static int GetMe       get   return 0         you need to OR NonPublic and Static only

User · Answer

myType GetProperties BindingFlags Public   BindingFlags Static    BindingFlags FlattenHierarchy     This will return all static properties in static base class or a particular type and probably the child as well

User · Answer

A little clarity        Get a PropertyInfo of specific property type T  GetProperty       PropertyInfo propertyInfo  propertyInfo   typeof TypeWithTheStaticProperty       GetProperty  NameOfStaticProperty   BindingFlags Public   BindingFlags Static        Use the PropertyInfo to retrieve the value from the type by not passing in an instance object value   propertyInfo GetValue null  null       Cast the value to the desired type ExpectedType typedValue    ExpectedType  value

User · Answer

Ok so the key for me was to use the  FlattenHierarchy BindingFlag   I don t really know why I just added it on a hunch and it started working   So the final solution that allows me to get Public Instance or Static Properties is   obj GetType GetProperty propName  Reflection BindingFlags Public     Or Reflection BindingFlags Static Or Reflection BindingFlags Instance Or     Reflection BindingFlags FlattenHierarchy

User · Answer

Just wanted to clarify this for myself  while using the new reflection API based on TypeInfo - where BindingFlags is not available reliably  depending on target framework    In the  new  reflection  to get the static properties for a type  not including base class es   you have to do something like   IEnumerable lt PropertyInfo gt  props      type GetTypeInfo   DeclaredProperties Where p   gt        p GetMethod    null  amp  amp  p GetMethod IsStatic          p SetMethod    null  amp  amp  p SetMethod IsStatic      Caters for both read-only or write-only properties  despite write-only being a terrible idea    The DeclaredProperties member  too doesn t distinguish between properties with public private accessors - so to filter around visibility  you then need to do it based on the accessor you need to use   E g - assuming the above call has returned  you could do   var publicStaticReadable   props Where p   gt  p GetMethod    null  amp  amp  p GetMethod IsPublic     There are some shortcut methods available - but ultimately we re all going to be writing a lot more extension methods around the TypeInfo query methods properties in the future   Also  the new API forces us to think about exactly what we think of as a  private  or  public  property from now on - because we must filter ourselves based on individual accessors

[.net] How to get a Static property with Reflection

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