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#if !SILVERLIGHT && CLR40
using System;
using System.Reflection;
using System.Security;
using System.Security.Permissions;
namespace Microsoft.Internal
{
internal static class ReflectionInvoke
{
private static readonly ReflectionPermission _memberAccess = new ReflectionPermission(ReflectionPermissionFlag.MemberAccess);
private static readonly ReflectionPermission _restrictedMemberAccess = new ReflectionPermission(ReflectionPermissionFlag.RestrictedMemberAccess);
public static object SafeCreateInstance(this Type type, params object[] arguments)
{
DemandMemberAccessIfNeeded(type);
return Activator.CreateInstance(type, arguments);
}
public static object SafeInvoke(this ConstructorInfo constructor, params object[] arguments)
{
DemandMemberAccessIfNeeded(constructor);
return constructor.Invoke(arguments);
}
public static object SafeInvoke(this MethodInfo method, object instance, params object[] arguments)
{
DemandMemberAccessIfNeeded(method);
return method.Invoke(instance, arguments);
}
public static object SafeGetValue(this FieldInfo field, object instance)
{
DemandMemberAccessIfNeeded(field);
return field.GetValue(instance);
}
public static void SafeSetValue(this FieldInfo field, object instance, object value)
{
DemandMemberAccessIfNeeded(field);
field.SetValue(instance, value);
}
public static void DemandMemberAccessIfNeeded(MethodInfo method)
{
if (!method.IsVisible())
{
DemandMemberAccess(method);
}
}
private static void DemandMemberAccessIfNeeded(FieldInfo field)
{
if (!field.IsVisible())
{
DemandMemberAccess(field);
}
}
public static void DemandMemberAccessIfNeeded(Type type)
{
// Consult UnderlyingSystemType this is the type that Activator.CreateInstance creates
if (!type.UnderlyingSystemType.IsVisible)
{
DemandMemberAccess(type);
}
}
private static void DemandMemberAccessIfNeeded(ConstructorInfo constructor)
{
if (!constructor.IsVisible())
{
DemandMemberAccess(constructor);
}
}
private static void DemandMemberAccess(MemberInfo target)
{
try
{
_memberAccess.Demand();
}
catch (SecurityException)
{ // The caller doesn't have member access, but let's see whether they have access to
// members of assemblies with less or equal permissions (this mimics Reflection's behavior)
DemandRestrictedMemberAccess(target);
}
}
private static void DemandRestrictedMemberAccess(MemberInfo target)
{
Assembly targetAssembly = target.Assembly();
PermissionSet targetGrantSet = UnsafePermissionSet(targetAssembly);
targetGrantSet.AddPermission(_restrictedMemberAccess);
targetGrantSet.Demand();
}
[SecuritySafeCritical] // PermissionSet is [SecurityCritical]
private static PermissionSet UnsafePermissionSet(Assembly assembly)
{
return assembly.PermissionSet;
}
}
}
#endif
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