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.
This question is related to
.net
reflection
static
Try this C# Reflection link.
Note I think that BindingFlags.Instance and BindingFlags.Static are exclusive.
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());
}
}
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());
}
}
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)
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());
}
}
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...
}
Try this C# Reflection link.
Note I think that BindingFlags.Instance and BindingFlags.Static are exclusive.
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...
}
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;
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)
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());
}
}
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<PropertyInfo> props =
type.GetTypeInfo().DeclaredProperties.Where(p =>
(p.GetMethod != null && p.GetMethod.IsStatic) ||
(p.SetMethod != null && 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 => p.GetMethod != null && 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.
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.
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)
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.
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<PropertyInfo> props =
type.GetTypeInfo().DeclaredProperties.Where(p =>
(p.GetMethod != null && p.GetMethod.IsStatic) ||
(p.SetMethod != null && 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 => p.GetMethod != null && 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.
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;
Source: Stackoverflow.com