最简单类型的StackOverflowException扩展了DynamicObject

Question

我从类型扩展DynamicObject遇到了一个奇怪的问题。我甚至尝试过MSDN的样本：

// The class derived from DynamicObject. 
public class DynamicDictionary : DynamicObject
{
    // The inner dictionary.
    Dictionary<string, object> dictionary
        = new Dictionary<string, object>();

    // This property returns the number of elements 
    // in the inner dictionary. 
    public int Count
    {
        get
        {
            return dictionary.Count;
        }
    }

    // If you try to get a value of a property  
    // not defined in the class, this method is called. 
    public override bool TryGetMember(
        GetMemberBinder binder, out object result)
    {
        // Converting the property name to lowercase 
        // so that property names become case-insensitive. 
        string name = binder.Name.ToLower();

        // If the property name is found in a dictionary, 
        // set the result parameter to the property value and return true. 
        // Otherwise, return false. 
        return dictionary.TryGetValue(name, out result);
    }

    // If you try to set a value of a property that is 
    // not defined in the class, this method is called. 
    public override bool TrySetMember(
        SetMemberBinder binder, object value)
    {
        // Converting the property name to lowercase 
        // so that property names become case-insensitive.
        dictionary[binder.Name.ToLower()] = value;

        // You can always add a value to a dictionary, 
        // so this method always returns true. 
        return true;
    }
}

用法：

dynamic d = new DynamicDictionary();
d.FirstName = "Jeff"; // stack overflow

代码可以找到一个新的简单控制台，但它只是从一个巨大的WPF应用程序抛出StackOverflowException。在WPF中，我们使用ExpandoObject有其他动态代码，但它对DynamicObject来说是失败的：

WPF项目和控制台都是.NET 4.0（完整配置文件）。有人可以分享一些想法吗？