我遇到了一个来自类型扩展 DynamicObject 的奇怪问题。我什至尝试了来自 MSDN 的示例:
// 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
该代码适用于一个新的简单控制台,但它只是从一个巨大的 WPF 应用程序中抛出 StackOverflowException。在 WPF 中,我们还有其他使用 ExpandoObject 的动态代码,但 DynamicObject 失败了:
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?