[英]How do I deserialize a List<T> as another List<T> instead of a readonly T[]?
We have some code that makes a copy of a List<T>
of objects. 我们有一些代码可以复制对象的
List<T>
。 The problem is the code is returning a readonly array of T[]
instead of a List<T>
. 问题在于代码返回的是
T[]
的只读数组,而不是List<T>
。
Why is that, and how can I fix this deserialization code? 为什么会这样,如何解决此反序列化代码?
public interface ITestObject { }
[KnownType(typeof(ITestObject))]
[DataContract(Name = "TestObject")]
public class TestObject : ITestObject
{
[DataMember]
public int Id { get; set; }
[DataMember]
public string Value { get; set; }
}
public class TestApp
{
public void Run()
{
IList<ITestObject> a = new List<ITestObject>();
a.Add(new TestObject() { Id = 1, Value = "A" });
a.Add(new TestObject() { Id = 2, Value = "B" });
IList<ITestObject> b = Copy(a);
// a is a List<T> while b is a readonly T[]
Debug.WriteLine(a.GetType().FullName);
Debug.WriteLine(b.GetType().FullName);
}
public IList<ITestObject> Copy(IList<ITestObject> list)
{
DataContractSerializer serializer = new DataContractSerializer(typeof(IList<ITestObject>), new Type[] { typeof(TestObject) });
using (Stream stream = new MemoryStream())
{
serializer.WriteObject(stream, list);
stream.Seek(0, SeekOrigin.Begin);
IList<ITestObject> clone = (IList<ITestObject>)serializer.ReadObject(stream);
stream.Close();
return clone;
}
}
}
I'm guessing it's something to do with the fact List<T>
isn't listed as a KnownType
我想这与
List<T>
未列为KnownType
的事实有关
尝试使用DataContractSerializer(typeof(List<ITestObject>)
,以使其了解具体类型
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