我已经阅读了很多关于如何使用 ExpandoObject 通过添加属性从头开始动态创建对象的内容，但我还没有找到你如何做同样的事情开始来自您已经拥有的非动态C＃对象。
例如，我有这个琐碎的课程：
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</div>我想将它转换为ExpandoObject，以便我可以根据它已经添加或删除属性，而不是从头开始重建相同的东西。这可能吗？
编辑：标记为重复的问题显然不会与此重复。
答案 0 :(得分：9)
可以这样做：
var person = new Person { Id = 1, Name = "John Doe" };
var expando = new ExpandoObject();
var dictionary = (IDictionary<string, object>)expando;
foreach (var property in person.GetType().GetProperties())
dictionary.Add(property.Name, property.GetValue(person));
答案 1 :(得分：1)
您无法将Person类“转换”为expando对象。但是，您可以创建包含Person的包装器DynamicObject并转发所有字段。
using System;
using System.Collections.Generic;
using System.Dynamic;
using System.Reflection;
namespace SandboxConsole
{
public class ExpandoWrapper : DynamicObject
{
private readonly object _item;
private readonly Dictionary<string, PropertyInfo> _lookup = new Dictionary<string, PropertyInfo>(StringComparer.InvariantCulture);
private readonly Dictionary<string, PropertyInfo> _ignoreCaseLookup = new Dictionary<string, PropertyInfo>(StringComparer.InvariantCultureIgnoreCase);
private readonly Dictionary<string, Box> _lookupExtra = new Dictionary<string, Box>(StringComparer.InvariantCulture);
private readonly Dictionary<string, Box> _ignoreCaseLookupExtra = new Dictionary<string, Box>(StringComparer.InvariantCultureIgnoreCase);
private class Box
{
public Box(object item)
{
Item = item;
}
public object Item { get; }
}
public ExpandoWrapper(object item)
{
_item = item;
var itemType = item.GetType();
foreach (var propertyInfo in itemType.GetProperties())
{
_lookup.Add(propertyInfo.Name, propertyInfo);
_ignoreCaseLookup.Add(propertyInfo.Name, propertyInfo);
}
}
public override bool TryGetMember(GetMemberBinder binder, out object result)
{
result = null;
PropertyInfo lookup;
if (binder.IgnoreCase)
{
_ignoreCaseLookup.TryGetValue(binder.Name, out lookup);
}
else
{
_lookup.TryGetValue(binder.Name, out lookup);
}
if (lookup != null)
{
result = lookup.GetValue(_item);
return true;
}
Box box;
if (binder.IgnoreCase)
{
_ignoreCaseLookupExtra.TryGetValue(binder.Name, out box);
}
else
{
_lookupExtra.TryGetValue(binder.Name, out box);
}
if (box != null)
{
result = box.Item;
return true;
}
return false;
}
public override bool TrySetMember(SetMemberBinder binder, object value)
{
PropertyInfo lookup;
if (binder.IgnoreCase)
{
_ignoreCaseLookup.TryGetValue(binder.Name, out lookup);
}
else
{
_lookup.TryGetValue(binder.Name, out lookup);
}
if (lookup != null)
{
lookup.SetValue(_item, value);
return true;
}
var box = new Box(value);
_ignoreCaseLookupExtra[binder.Name] = box;
_lookupExtra[binder.Name] = box;
return true;
}
}
}
示例用法
using System;
namespace SandboxConsole
{
class Program
{
static void Main(string[] args)
{
var person = new Person() {Id = 1};
dynamic wrapper = new ExpandoWrapper(person);
wrapper.Id = 2;
wrapper.NewField = "Foo";
Console.WriteLine(wrapper.Id);
Console.WriteLine(person.Id);
Console.WriteLine(wrapper.NewField);
}
}
public class Person
{
public int Id { get; set; }
public string Name { get; set; }
public string Address { get; set; }
public string Telephone { get; set; }
}
}