❔ Is it possible to serialize this struct?
Hello,
I want to serialize this struct to json:
I'm have these methods:
Is it possible? At the moment it only returns 2 bytes (the curly braces). I'm assuming this has something to do with the marshalling because it works without it
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)]
public struct EndOfBarTelegram
{
public static readonly string Key = nameof(EndOfBarTelegram);
public uint MessageLength;
public uint MessageId;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 2)]
public string ProfileType;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 30)]
public string ProfileName;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 20)]
public string BloomId;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 14)]
public string TimeIn;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 14)]
public string TimeOut;
public float BarLength;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 50)]
public float[] Mean;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 50)]
public float[] Max;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 50)]
public float[] Min;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 50)]
public float[] DefectLength;
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)]
public struct EndOfBarTelegram
{
public static readonly string Key = nameof(EndOfBarTelegram);
public uint MessageLength;
public uint MessageId;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 2)]
public string ProfileType;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 30)]
public string ProfileName;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 20)]
public string BloomId;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 14)]
public string TimeIn;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 14)]
public string TimeOut;
public float BarLength;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 50)]
public float[] Mean;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 50)]
public float[] Max;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 50)]
public float[] Min;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 50)]
public float[] DefectLength;
}
public static ReadOnlyMemory<byte> SetTJson<T>(T obj)
{
string s = JsonSerializer.Serialize(obj);
return new ReadOnlyMemory<byte>(Encoding.UTF8.GetBytes(s));
}
public static ReadOnlyMemory<byte> SetTJson<T>(T obj, JsonSerializerOptions jsonOptions)
{
string s = JsonSerializer.Serialize(obj, jsonOptions);
return new ReadOnlyMemory<byte>(Encoding.UTF8.GetBytes(s));
}
public static ReadOnlyMemory<byte> SetTJson<T>(T obj)
{
string s = JsonSerializer.Serialize(obj);
return new ReadOnlyMemory<byte>(Encoding.UTF8.GetBytes(s));
}
public static ReadOnlyMemory<byte> SetTJson<T>(T obj, JsonSerializerOptions jsonOptions)
{
string s = JsonSerializer.Serialize(obj, jsonOptions);
return new ReadOnlyMemory<byte>(Encoding.UTF8.GetBytes(s));
}
9 Replies
STJ by default doesn't serialize fields
You'll have to set
IncludeFields in the JsonSerializerOptions to trueOr turn those fields into properties
I can't turn them into properties because of marshalas
Thinker
REPL Result: Success
using STJ = System.Text.Json;
class Person
{
public string name;
public int age;
}
var p = new Person() { name = "John Doe", age = 30 };
var options = new STJ.JsonSerializerOptions() { IncludeFields = true };
STJ.JsonSerializer.Serialize(p, options)
using STJ = System.Text.Json;
class Person
{
public string name;
public int age;
}
var p = new Person() { name = "John Doe", age = 30 };
var options = new STJ.JsonSerializerOptions() { IncludeFields = true };
STJ.JsonSerializer.Serialize(p, options)
Result: string
{"name":"John Doe","age":30}
{"name":"John Doe","age":30}
Compile: 595.319ms | Execution: 53.097ms | React with ❌ to remove this embed.
That works thanks
What if I wanted to make all of the fields
readonly? How can I deserialize this?
namespace MillTracking.Shared.Models.Telegrams;
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)]
public readonly record struct EndOfBarTelegram
{
public static readonly string Key = nameof(EndOfBarTelegram);
public readonly uint MessageLength;
public readonly uint MessageId;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 2)]
public readonly string ProfileType;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 30)]
public readonly string ProfileName;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 20)]
public readonly string BloomId;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 14)]
public readonly string TimeIn;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 14)]
public readonly string TimeOut;
public readonly float BarLength;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 50)]
public readonly float[] Mean;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 50)]
public readonly float[] Max;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 50)]
public readonly float[] Min;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 50)]
public readonly float[] DefectLength;
}
namespace MillTracking.Shared.Models.Telegrams;
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)]
public readonly record struct EndOfBarTelegram
{
public static readonly string Key = nameof(EndOfBarTelegram);
public readonly uint MessageLength;
public readonly uint MessageId;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 2)]
public readonly string ProfileType;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 30)]
public readonly string ProfileName;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 20)]
public readonly string BloomId;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 14)]
public readonly string TimeIn;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 14)]
public readonly string TimeOut;
public readonly float BarLength;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 50)]
public readonly float[] Mean;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 50)]
public readonly float[] Max;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 50)]
public readonly float[] Min;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 50)]
public readonly float[] DefectLength;
}
public static T? DecodeJson<T>(ReadOnlyMemory<byte> buffer, JsonSerializerOptions? jsonOptions = null)
{
try
{
JsonSerializerOptions options = jsonOptions ?? defaultJsonOptions;
T val = JsonSerializer.Deserialize<T>(Encoding.UTF8.GetString(buffer.Span), options);
return (val != null) ? val : default(T);
}
catch (Exception)
{
return default(T);
}
}
public static T? DecodeJson<T>(ReadOnlyMemory<byte> buffer, JsonSerializerOptions? jsonOptions = null)
{
try
{
JsonSerializerOptions options = jsonOptions ?? defaultJsonOptions;
T val = JsonSerializer.Deserialize<T>(Encoding.UTF8.GetString(buffer.Span), options);
return (val != null) ? val : default(T);
}
catch (Exception)
{
return default(T);
}
}
Thinker
REPL Result: Success
using STJ = System.Text.Json;
readonly struct Person
{
public readonly string name;
public readonly int age;
public Person(string name, int age) => (this.name, this.age) = (name, age);
}
var options = new STJ.JsonSerializerOptions() { IncludeFields = true };
STJ.JsonSerializer.Deserialize<Person>("""{"name":"John Doe","age":30}""", options)
using STJ = System.Text.Json;
readonly struct Person
{
public readonly string name;
public readonly int age;
public Person(string name, int age) => (this.name, this.age) = (name, age);
}
var options = new STJ.JsonSerializerOptions() { IncludeFields = true };
STJ.JsonSerializer.Deserialize<Person>("""{"name":"John Doe","age":30}""", options)
Result: Person
{
"name": null,
"age": 0
}
{
"name": null,
"age": 0
}
Compile: 681.216ms | Execution: 69.224ms | React with ❌ to remove this embed.
can't do it
got it
Was this issue resolved? If so, run
/close - otherwise I will mark this as stale and this post will be archived until there is new activity.