Read a BigInteger serialized from Java into C#

Question

I have a BigInteger serialized to a file by a Java program using the writeObject method from ObjectOutputStream .

Can I deserialize it in C#? I tried using the java.math and java.io classes of vjslib , but I get an exception:

InvalidClassException the class does not match the class of the persisted object for cl = java.lang.Number : __SUID = -8742448824652078965, getSUID(cl) = 3166984097235214156

Any ideas?

Answer 1

Do you have control over the serialization step from Java?

If so, I would suggest serializing a byte array, either as binary, or base64, and reading the byte array from the serialized structure.

Then you can pass the byte array to the System.Numerics.BigInteger constructor.

Answer 2

如果你不介意丑陋的黑客：我会说最简单的（尽管不是最有效的）方法是在Java端将其写成ASCII字符串，并在C＃端解析该字符串，而不是使用二进制/序列化。

Answer 3

I suggest you don't use serialization for this, since the two versions of BigInteger are not compatible - they have different version ids.

You should write the object out in some other way, probably using the byte array from BigInteger.toByteArray

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