System.Xml.XmlSerializer cannot serialize System.Nullable<t> as attribute

System.InvalidOperationException occurred
  HResult=-2146233079
  Message=Cannot serialize member 'ResX' of type System.Nullable`1[System.Double]. XmlAttribute/XmlText cannot be used to encode complex types.
  Source=System.Xml.XmlSerializer
  StackTrace:
       at System.Xml.Serialization.XmlReflectionImporter.ImportAccessorMapping(MemberMapping accessor, FieldModel model, XmlAttributes a, String ns, Type choiceIdentifierType, Boolean rpc, Boolean openModel, RecursionLimiter limiter)
  InnerException:

@zhenlan

cc: @zhenlan

@SamuelEnglard can you provide an example to reproduce this issue?

using System;

namespace SerializeNull
{
    public class Program
    {
        public class TestSerialize
        {
            [System.Xml.Serialization.XmlAttribute]
            public double? Attr
            {
                get;
                set;
            }
        }

        public static void Main(string[] args)
        {
            System.Xml.Serialization.XmlSerializer s = new System.Xml.Serialization.XmlSerializer(typeof(TestSerialize));
            using (System.IO.MemoryStream m = new System.IO.MemoryStream())
            {
                s.Serialize(m, new TestSerialize() { Attr = 1 });
                m.Seek(0, System.IO.SeekOrigin.Begin);
                Console.WriteLine((new System.IO.StreamReader(m)).ReadToEnd());
            }
            Console.ReadLine();
        }
    }
}

This should do it

Does this also happen on desktop .NET?

@SGuyGe

@SGuyGe Can reproduce in Desktop .NET 2.0 through 4.6.2

Someone needs to debug it and find out which code to change.

The fix is more complex than expected. Move to future. Refer dotnet/corefx#30536.

Due to the complexity of the fix and that it also exists in the full framework and that it is also a corner case will not fix.

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`System.Xml.XmlSerializer` cannot serialize `System.Nullable<t>` as attribute #1412

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System.Xml.XmlSerializer cannot serialize System.Nullable<t> as attribute #1412

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joshfree commented on May 3, 2016

khdang commented on May 3, 2016

shmuelie commented on May 3, 2016

SGuyGe commented on May 5, 2016

shmuelie commented on May 6, 2016

karelz commented on Nov 4, 2016

huanwu commented on Aug 16, 2018

StephenBonikowsky commented on Feb 28, 2020

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`System.Xml.XmlSerializer` cannot serialize `System.Nullable<t>` as attribute #1412