CODEWITHSUNDEEP
c#wpf.net-4.0
Artem Makarov
Artem Makarov

Reputation: 874

Retrieve property info from dynamic by Reflection

ADDED: What I want to do. I have something, for example, DataReader, from which I want to create IEnumerable of objects with members as in DataReader. So, in design and compile time I don't know how many properties will be in my dynamic object (depends on how many columns contains in DataReader) and it names. AND I need to create such dynamic anonymous object with properties with right names and values, to get this properties in future by reflection...

I thought about DynamicObject and that's what I've done:

I have DynamicObject class:

using System.Collections.Generic;
using System.Dynamic;
using System.Linq;

namespace makarov.ReportManager.InternalLogic
{
public class DataReaderParcer : DynamicObject
{
    private readonly Dictionary<string, object> m_properties;

    public DataReaderParcer()
    {
        m_properties = new Dictionary<string, object>();
    }

    public bool SetMember(string name, object value)
    {
        if (m_properties.ContainsKey(name))
            m_properties.Remove(name);
        m_properties.Add(name, value);
        return true;
    }

    public override bool TrySetMember(SetMemberBinder binder, object value)
    {
        return SetMember(binder.Name, value);
    }

    public override bool TryGetMember(GetMemberBinder binder, out object result)
    {
        result = null;
        if (m_properties.ContainsKey(binder.Name))
            result = m_properties[binder.Name];
        return m_properties.ContainsKey(binder.Name);
    }

    public override IEnumerable<string> GetDynamicMemberNames()
    {
        return from p in m_properties select p.Key;
    }
}

}

And here is the usage:

   dynamic dd = new DataReaderParcer();
        dd.MyMember= 3;
        dd.YourMember= "hello";

How to retrieve PropertyInfo[] of this object using Reflection in another method? Something like this dd.GetType().GetProperties() doesn't work correctly because DataReaderParcer don't have any properties.

Upvotes: 2

Views: 4481

Answers (1)

Justin Harvey
Justin Harvey

Reputation: 14672

You are derriving from DynamicObject therefore you can call GetDynamicMemberNames to get an enumeration your members.

http://msdn.microsoft.com/en-us/library/system.dynamic.dynamicobject.getdynamicmembernames.aspx

dynamic dd = new DataReaderParcer();
IEnumerable<string> members = dd.GetDynamicMemberNames();

Upvotes: 3

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