我有一个项目,目前正在使用Json.Net进行Json反序列化,类似于这样的类:
public class Foo {
public Guid FooGuid { get; set; }
public string Name { get; set; }
public List<Bar> Bars { get; set; }
}
public class Bar {
public Guid BarGuid { get; set; }
public string Description { get; set; }
}
到目前为止,它运行良好。
为了使迭代更简单,在某一点上我让Foo
类实现了IEnumerable<Bar>
,如下所示:
public class Foo : IEnumerable<Bar> {
public Guid FooGuid { get; set; }
public string Name { get; set; }
public List<Bar> Bars { get; set; }
public IEnumerator<Bar> GetEnumerator()
{
return Bars.GetEnumerator();
}
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
}
public class Bar {
public Guid BarGuid { get; set; }
public string Description { get; set; }
}
但是它在反序列化对象时失败了。错误信息很令人困惑,因为它说无法反序列化FooGuid
字段,但是移除IEnumerable
接口后又可以工作了。
这个问题在模拟器或设备上的MonoTouch和MonoDroid环境中都存在。
有什么办法可以解决它吗?
添加了重现此问题的代码:
public static class Tests {
public static void SerializeAndDeserializeFoo() {
// Serialize and deserialize Foo class
var element = new Foo
{
FooGuid = Guid.NewGuid(),
Name = "Foo name",
Bars = new List<Bar> {
new Bar { BarGuid = Guid.NewGuid(), Description = "Bar description" },
new Bar { BarGuid = Guid.NewGuid(), Description = "Bar description" },
new Bar { BarGuid = Guid.NewGuid(), Description = "Bar description" }
}
};
var serializedObject = JsonConvert.SerializeObject(element);
Console.WriteLine("Serialized Foo element: {0}", serializedObject);
// Exception if Foo implements IEnumerable
var deserializedObject = JsonConvert.DeserializeObject<Foo>(serializedObject);
Console.WriteLine("Foo deserialization worked!");
}
public static void SerializeAndDeserializeEnumerableFoo() {
// Serialize and deserialize Foo class
var element = new EnumerableFoo
{
FooGuid = Guid.NewGuid(),
Name = "Foo name",
Bars = new List<Bar> {
new Bar { BarGuid = Guid.NewGuid(), Description = "Bar description" },
new Bar { BarGuid = Guid.NewGuid(), Description = "Bar description" },
new Bar { BarGuid = Guid.NewGuid(), Description = "Bar description" }
}
};
var serializedObject = JsonConvert.SerializeObject(element);
Console.WriteLine("Serialized EnumerableFoo element: {0}", serializedObject);
try {
// Exception if Foo implements IEnumerable
var deserializedObject = JsonConvert.DeserializeObject<EnumerableFoo>(serializedObject);
Console.WriteLine("EnumerableFoo deserialization worked!");
}
catch (Exception e){
Console.WriteLine("EnumerableFoo deserialization failed!");
throw;
}
}
}
public class EnumerableFoo : IEnumerable<Bar> {
public Guid FooGuid { get; set; }
public string Name { get; set; }
public List<Bar> Bars { get; set; }
public IEnumerator<Bar> GetEnumerator()
{
return Bars.GetEnumerator();
}
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
}
public class Foo {
public Guid FooGuid { get; set; }
public string Name { get; set; }
public List<Bar> Bars { get; set; }
}
public class Bar {
public Guid BarGuid { get; set; }
public string Description { get; set; }
}
样例项目:https://www.dropbox.com/s/27i58aiz71dylkw/IEnumerableJson.zip
IEnumerable<Bar>
。只需将以下方法放进EnumerableFoo
里(移除其他的 GetEnumerators):public IEnumerator GetEnumerator() { return Bars.GetEnumerator(); }
这样就可以在 foreach 中使用了。 - L.B