Get nested property values through reflection C#

Question

I have following code.

Classes:

public class AlloyDock
{
    public int Left { get; set; }
    public int Right { get; set; }
}

pub         


        

Answer 1

When passing an object instance to the GetValue method, you need to pass the instance of the correct type:

// 1st level properties
var parentProperties = obj.GetType().GetProperties();
foreach (var prop in parentProperties)
{
    // get the actual instance of this property
    var propertyInstance = prop.GetValue(obj, null);

    // get 2nd level properties
    var mainObjectsProperties = prop.PropertyType.GetProperties();

    foreach (var property in mainObjectsProperties)
    {
        // get the actual instance of this 2nd level property
        var leafInstance = property.GetValue(propertyInstance, null);

        // 3rd level props
        var leafProperties = property.PropertyType.GetProperties();

        foreach (var leafProperty in leafProperties)
        {
            Console.WriteLine("{0}={1}",
                leafProperty.Name, leafProperty.GetValue(leafInstance, null));
        }
    }
}

You might do this recursively to simplify (generalize) the whole thing:

static void DumpObjectTree(object propValue, int level = 0)
{
    if (propValue == null)
        return;

    var childProps = propValue.GetType().GetProperties();
    foreach (var prop in childProps)
    {
        var name = prop.Name;
        var value = prop.GetValue(propValue, null);

        // add some left padding to make it look like a tree
        Console.WriteLine("".PadLeft(level * 4, ' ') + "{0}={1}", name, value);

        // call again for the child property
        DumpObjectTree(value, level + 1);
    }
}

// usage: DumpObjectTree(obj);

Answer 2

The problem is with this expression:

leafProperty.GetValue(obj, null)

You are passing the root object in to get the leaf property. As you process each property you need to get its value and then call GetValue against it.