6.0 - System.Text.Json.JsonSerializer.Deserialize System.Net.DnsEndPoint System.NotSupportedException

[vindicatorr]

Description

System.Text.Json.JsonSerializer.Deserialize for System.Net.DnsEndPoint results in: "Deserialization of types without a parameterless constructor, a singular parameterized constructor, or a parameterized constructor annotated with 'JsonConstructorAttribute' is not supported. Type 'System.Net.DnsEndPoint'..."

Configuration

• Which version of .NET is the code running on? 6.0.100-preview.1.21107.2
• What OS and version, and what distro if applicable? Arch Linux
• What is the architecture (x64, x86, ARM, ARM64)? x64
• Do you know whether it is specific to that configuration? I don't believe so.
• If you're using Blazor, which web browser(s) do you see this issue in? N/A

Regression?

I don't believe so: #29895

Other information

I thought I read it was supposed to work in 5.0, but I was already using that.
When I saw it was marked as "Done" for 6.0 (#29895 (comment)), I installed that, but it's still an issue.
It at least serialized the object:

{"PDnsEndPoint":{"Host":"hostName","AddressFamily":0,"Port":0},"POther0":null,"POther1":null}

[ghost]

Tagging subscribers to this area: @eiriktsarpalis, @layomia
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Description

System.Text.Json.JsonSerializer.Deserialize for System.Net.DnsEndPoint results in: "Deserialization of types without a parameterless constructor, a singular parameterized constructor, or a parameterized constructor annotated with 'JsonConstructorAttribute' is not supported. Type 'System.Net.DnsEndPoint'..."

Configuration

• Which version of .NET is the code running on? 6.0.100-preview.1.21107.2
• What OS and version, and what distro if applicable? Arch Linux
• What is the architecture (x64, x86, ARM, ARM64)? x64
• Do you know whether it is specific to that configuration? I don't believe so.
• If you're using Blazor, which web browser(s) do you see this issue in? N/A

Regression?

I don't believe so: #29895

Other information

I thought I read it was supposed to work in 5.0, but I was already using that.
When I saw it was marked as "Done" for 6.0 (#29895 (comment)), I installed that, but it's still an issue.
It at least serialized the object:

{"PDnsEndPoint":{"Host":"hostName","AddressFamily":0,"Port":0},"POther0":null,"POther1":null}

Author:	vindicatorr
Assignees:	-
Labels:	area-System.Text.Json, untriaged
Milestone:	-

[eiriktsarpalis]

I believe the standard approach for serializing a class you don't own is to define a JsonConverter. cc @layomia to comment on whether it is possible to specify deserialization constructors for class we don't own.

[vindicatorr]

That's a great feature. I just made use of it and like it. https://docs.microsoft.com/en-us/dotnet/standard/serialization/system-text-json-converters-how-to?pivots=dotnet-5-0

[layomia]

Later in .NET 6.0 when we expose the internal serialization metadata classes as part of the JSON code gen work - #34456 - users will be able to specify the deserialization constructor to use for any type (including non-owned types), without JsonConstructorAttrbute.