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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
using System.Dynamic;
using System.Globalization;
using System.Reflection;
namespace System.Web.WebPages
{
// Allows dynamic access over a CLR object via private reflection
internal sealed class ReflectionDynamicObject : DynamicObject
{
private object RealObject { get; set; }
public static object WrapObjectIfInternal(object o)
{
// If it's null, don't try to wrap it
if (o == null)
{
return null;
}
// If it's public, leave it alone since the standard dynamic binder will work. Well, it won't work for
// internal properties, but we're mostly concerned about supporting anonymous objects, which are never public
if (o.GetType().IsPublic)
{
return o;
}
return new ReflectionDynamicObject() { RealObject = o };
}
// Called when a property is accessed
public override bool TryGetMember(GetMemberBinder binder, out object result)
{
// Get the property info
PropertyInfo propInfo = RealObject.GetType().GetProperty(
binder.Name,
BindingFlags.GetProperty | BindingFlags.Instance | BindingFlags.Public);
if (propInfo == null)
{
// If there is no such property, return null instead of failing. This allows optional parameters
result = null;
}
else
{
// Get the property value
result = propInfo.GetValue(RealObject, null);
// Wrap the sub object if necessary. This allows nested anonymous objects to work.
result = WrapObjectIfInternal(result);
}
return true;
}
// Called when a method is called
public override bool TryInvokeMember(InvokeMemberBinder binder, object[] args, out object result)
{
result = RealObject.GetType().InvokeMember(
binder.Name,
BindingFlags.InvokeMethod | BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic,
null,
RealObject,
args,
CultureInfo.InvariantCulture);
return true;
}
// Called when the dynamic object needs to be converted to a non dynamic object
public override bool TryConvert(ConvertBinder binder, out object result)
{
result = RealObject;
return true;
}
public override string ToString()
{
// Just return the original object's display string
return RealObject.ToString();
}
}
}
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