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binaryformatter removal in .net 9 and migration strategies

the .net team has removed `binaryformatter` from .net 9 (and .net 8 as well), as announced in various github issues and discussions (e.g., issue 293 you mentioned might be referencing one of those). this decision stems from significant security vulnerabilities associated with `binaryformatter`. it's a crucial update that enhances the security posture of .net applications. this tutorial details why `binaryformatter` is deprecated, the risks associated with it, and how to migrate your code to safer alternatives.

*why binaryformatter is removed:*

`binaryformatter` is a serialization mechanism that allows you to convert an object graph into a byte stream and back again. while convenient, it suffers from several critical flaws:

*security vulnerabilities:* `binaryformatter` is susceptible to various attacks, including deserialization attacks. malicious actors can craft specially crafted serialized data that, when deserialized by `binaryformatter`, can execute arbitrary code on the target system. this is a significant risk, especially in applications handling untrusted data.

*lack of versioning support:* `binaryformatter` doesn't inherently support versioning. changes in the structure of your serialized objects can lead to deserialization failures or unexpected behavior.

*performance issues:* `binaryformatter` is often slower and less efficient than modern serialization alternatives.


*code example (illustrating the problem and its removal):*

this example demonstrates how `binaryformatter` was used and why it's now unavailable:



if you try to compile and run this code with a .net 9 or later sdk, you'll receive a compiler error indicating that `binaryformatter` is no longer available.

*migration strategies:*

you must replace `binaryformatter` with a safer and more modern serialization technique. here are some recommended alternatives:

1. *system.text.json:* this is the recomme ...

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BinaryFormatter
.NET 9
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serialization
data format
security
backward compatibility
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code refactoring
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alternative serializers
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