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MessagePack-CSharp

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MessagePack-CSharp
Extremely Fast MessagePack Serializer for C#(.NET, .NET Core, Unity, Xamarin). / msgpack.org[C#]

C# · 6780 stars

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[GLD Serializer Benchmark] C# MessagePack-CSharp 2.5.302 — spec compliance misses Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

MessagePack-CSharp/MessagePack-CSharp#2299 · 1 comment · Opened Sep 14, 2026
Add ExcludeFromCodeCoverage attribute to generated code. Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

MessagePack-CSharp/MessagePack-CSharp#2297 · Opened Sep 11, 2026
Missing `.meta` files cause Unity to reject the MessagePack package Open

Difficulty 1/5 Under an hour Newbie friendliness 76/100

MessagePack-CSharp/MessagePack-CSharp#2292 · Opened Aug 14, 2026
IntelliSense error due to MessagePack source generator Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

MessagePack-CSharp/MessagePack-CSharp#2289 · Opened Aug 5, 2026
Generator and analyzer crash with IndexOutOfRangeException on a closed generic struct from a referenced assembly Open

Difficulty 3/5 1-2 days Newbie friendliness 75/100

MessagePack-CSharp/MessagePack-CSharp#2283 · Opened Jul 27, 2026
Digitally sign release assemblies Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

MessagePack-CSharp/MessagePack-CSharp#2277 · 4 comments · Opened Jul 1, 2026
TryReadMapHeader throws OverflowException Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

MessagePack-CSharp/MessagePack-CSharp#2276 · 2 comments · Opened Jun 16, 2026
MessagePackWriter Write(in ReadOnlySpan<byte> src) input should be scoped Open

Difficulty 2/5 1-3 hours Newbie friendliness 66/100

MessagePack-CSharp/MessagePack-CSharp#2252 · 3 comments · Opened Mar 20, 2026
CS0433 type conflict when using MessagePack v3.1.4 in Unity buildtime. Open

unity

Difficulty 4/5 3-5 days Newbie friendliness 35/100

MessagePack-CSharp/MessagePack-CSharp#2248 · 5 comments · Opened Jan 8, 2026
MessagePack source generators causes compiler error inside WPF XAML user control library projects Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

MessagePack-CSharp/MessagePack-CSharp#2243 · Opened Nov 24, 2025
Consider providing a big-endian Guid formatter Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

MessagePack-CSharp/MessagePack-CSharp#2240 · 1 reaction · Opened Nov 8, 2025
In Unity, the first call to MessagePackSerializer.SerializeToJson is very slow. Open

unity

Difficulty 4/5 3-5 days Newbie friendliness 30/100

MessagePack-CSharp/MessagePack-CSharp#2239 · 1 comment · Opened Nov 7, 2025
asp core - output formatter warning Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

MessagePack-CSharp/MessagePack-CSharp#2238 · Opened Nov 5, 2025
Failed to serialize as List<[MessagePackObject]> With Union Open

unity

Difficulty 4/5 3-5 days Newbie friendliness 28/100

MessagePack-CSharp/MessagePack-CSharp#2237 · 1 comment · Opened Nov 2, 2025
The analyzer does not work if SuppressSourceGeneration = true Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

MessagePack-CSharp/MessagePack-CSharp#2234 · Opened Oct 17, 2025
Missing MsgPack003 error when using class from other project Open

analyzer

Difficulty 4/5 3-5 days Newbie friendliness 45/100

MessagePack-CSharp/MessagePack-CSharp#2233 · 2 comments · Opened Oct 10, 2025
Cannot deserialize byte[] in class Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

MessagePack-CSharp/MessagePack-CSharp#2230 · 2 comments · Opened Sep 12, 2025
MessagePackSerializer.DeserializeAsync blocks for a complete read Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

MessagePack-CSharp/MessagePack-CSharp#2229 · 3 comments · Opened Sep 9, 2025
MessagePack 3.1 doesn't create formatters for abstract base classes unless they include MessagePackObjectAttribute Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

MessagePack-CSharp/MessagePack-CSharp#2219 · Opened Aug 7, 2025
MessagePack 3.1 doesn't serialize or deserialize keys in custom collections Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

MessagePack-CSharp/MessagePack-CSharp#2218 · Opened Aug 5, 2025
Using MessagePack with DataContract Annotation Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

MessagePack-CSharp/MessagePack-CSharp#2217 · 1 comment · Opened Aug 4, 2025
Support for readonly collections from Collection expressions Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

MessagePack-CSharp/MessagePack-CSharp#2216 · 3 comments · Opened Aug 4, 2025
Attribute [NonSerialized] not omitted Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

MessagePack-CSharp/MessagePack-CSharp#2214 · 3 comments · Opened Jul 31, 2025
FormatterNotRegisteredException when running Unity android build on Meta Quest 3 headset Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

MessagePack-CSharp/MessagePack-CSharp#2213 · Opened Jul 24, 2025
Compile Error When Using Default Interface Implementation of IMessagePackFormatter<T> with Source Generator Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

MessagePack-CSharp/MessagePack-CSharp#2211 · Opened Jul 15, 2025
Timezone-aware datetime support in MessagePack serialization Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

MessagePack-CSharp/MessagePack-CSharp#2210 · 3 comments · 1 reaction · Opened Jul 14, 2025
MessagePack 3.1 regression with chained polymorphic types. Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

MessagePack-CSharp/MessagePack-CSharp#2209 · Opened Jul 3, 2025
MessagePack 3.1 causing issues with ServiceHub.RoslynCodeAnalysisService.exe and build times. Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

MessagePack-CSharp/MessagePack-CSharp#2208 · Opened Jul 2, 2025
Build error for non MessagePack item containing a messagepack Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

MessagePack-CSharp/MessagePack-CSharp#2207 · 3 comments · Opened Jul 1, 2025
Redundant extra semicolon in the generated file (causing warning in some development tools) Open

Difficulty 1/5 Under an hour Newbie friendliness 52/100

MessagePack-CSharp/MessagePack-CSharp#2204 · 1 reaction · Opened Jun 23, 2025
Analyzer try report diagnostics MsgPack003 on codes that are not from current assembly, and then crash with code AD0001 Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

MessagePack-CSharp/MessagePack-CSharp#2200 · 1 comment · Opened Jun 2, 2025
NotImplementedException: byref delegate Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

MessagePack-CSharp/MessagePack-CSharp#2197 · 1 comment · Opened May 27, 2025
InvalidOperationException: Sequence contains no matching element at MessagePack.MessagePackSecurity+CompiledMethods.GetMethod() Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

MessagePack-CSharp/MessagePack-CSharp#2196 · 1 comment · Opened May 26, 2025
MessagePackSerializer.Deserialize throws MessagePackSerializationException instead of OperationCanceledException when cancellation is requested Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

MessagePack-CSharp/MessagePack-CSharp#2194 · 1 comment · 1 reaction · Opened May 21, 2025
MsgPack006 error when using custom formatter for generic types and MessagePack.Union Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

MessagePack-CSharp/MessagePack-CSharp#2193 · 1 reaction · Opened May 15, 2025
How to obtain the Arguments of the FormatterType under the MessagePackFormatterAttribute? Open

question

Difficulty 4/5 3-5 days Newbie friendliness 25/100

MessagePack-CSharp/MessagePack-CSharp#2190 · 1 comment · Opened Apr 30, 2025
Polymorphism issue - TypeLoadException when using string class names in UnionAttribute across projects Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

MessagePack-CSharp/MessagePack-CSharp#2187 · Opened Apr 18, 2025
MessagePack.Generator not working in .NET 9 Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

MessagePack-CSharp/MessagePack-CSharp#2186 · 1 comment · Opened Apr 13, 2025
No possibility to disable source generation for UnionAttribute Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

MessagePack-CSharp/MessagePack-CSharp#2184 · 3 comments · Opened Apr 10, 2025
Compile error when trying to serialize a private field in a generic class Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

MessagePack-CSharp/MessagePack-CSharp#2182 · Opened Apr 5, 2025
Priority conflict: [Key(string)] ignored by [MessagePackObject(keyAsPropertyName: true)] Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

MessagePack-CSharp/MessagePack-CSharp#2179 · Opened Mar 30, 2025
Holding onto memory via Static variable Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

MessagePack-CSharp/MessagePack-CSharp#2178 · 5 comments · Opened Mar 30, 2025
Failed to serialize MsgBase value Open

unity

Difficulty 5/5 Over a week Newbie friendliness 10/100

MessagePack-CSharp/MessagePack-CSharp#2175 · 2 comments · Opened Mar 24, 2025
DynamicUnionResolver throw an TypeLoadException when Unity 6 Profiler "Call Stacks" turned on Open

unity

Difficulty 4/5 3-5 days Newbie friendliness 35/100

MessagePack-CSharp/MessagePack-CSharp#2174 · Opened Mar 10, 2025
Data serialized in CSharp is not getting de-serialized in Python Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

MessagePack-CSharp/MessagePack-CSharp#2161 · 4 comments · Opened Feb 27, 2025
CS0246 error when using custom formatter for generic types Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

MessagePack-CSharp/MessagePack-CSharp#2160 · 3 comments · 2 reactions · Opened Feb 26, 2025
MessagePack.Formatters.System_Globalization_DateTimeFormatFlagsFormatter6 is attempting to implement an inaccessible interface Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

MessagePack-CSharp/MessagePack-CSharp#2159 · 2 comments · Opened Feb 20, 2025
Abstract property override and IgnoreMember attribute produces MsgPack007 error Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

MessagePack-CSharp/MessagePack-CSharp#2157 · Opened Feb 12, 2025
Unable to resolve references on Unity 6 builds with game-ci (Web & Windows) & NuGetForUnity Open

Difficulty 4/5 3-5 days Newbie friendliness 32/100

MessagePack-CSharp/MessagePack-CSharp#2155 · 1 comment · 2 reactions · Opened Feb 12, 2025
"No parameterless constructor defined for type..." when serializing record with List<T>, on AOT compiled binary Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

MessagePack-CSharp/MessagePack-CSharp#2147 · 3 comments · 6 reactions · Opened Feb 1, 2025

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