![](/img/trans.png)
[英]c# With Unity and LitJSON Getting an Invalid Cast Exception when trying to de-serialize back from JSONData object
[英]C# Exception when trying to serialize a dynamic derived object
我有以下課程:
[XmlInclude(typeof(Cat))]
[XmlInclude(typeof(Dog))]
[XmlInclude(typeof(Cow))]
[Serializable]
public abstract class Animal
{
public string Name { get; set; }
}
public class Cow : Animal
{
public Cow(string name) { Name = name; }
public Cow() { }
}
public class Dog : Animal
{
public Dog(string name) { Name = name; }
public Dog() { }
}
public class Cat : Animal
{
public Cat(string name) { Name = name; }
public Cat() {}
}
以及以下代碼段:
var animalList = new List<Animal>();
Type type = AnimalTypeBuilder.CompileResultType("Elephant", propertiesList);
var elephant = Activator.CreateInstance(type);
animalList.Add(new Dog());
animalList.Add(new Cat());
animalList.Add(new Cow());
animalList.Add((Animal)elephant);
using (var writer = new System.IO.StreamWriter(fileName))
{
var serializer = new XmlSerializer(animalList.GetType());
serializer.Serialize(writer, animalList);
writer.Flush();
}
當我嘗試序列化此列表時,出現錯誤:
System.InvalidOperationException:不需要類型大象。 使用XmlInclude或SoapInclude屬性可以指定靜態未知的類型。
起初,我還為Cat
, Cow
和Dog
對象獲得了此異常,並通過將[XmlInclude(typeof(...))]
到它們的類中來解決了該異常,但是對於動態派生,我找不到類似的解決方案類型,因為此屬性是在編譯時設置的。
您可以在運行時通過構造函數告訴XmlSerializer
有關所需的其他類型。 例如:
var serializer = new XmlSerializer(animalList.GetType(), new[] { typeof(Elephant) });
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.