How to Avoid `System.Runtime.InteropServices.SafeArrayTypeMismatchException` When Deserializing Structs Over TCP?

C# Deserializing a struct after receiving it through TCP

When attempting to transmit a struct over TCP, users may encounter issues with deserialization. Specifically, the exception "System.Runtime.InteropServices.SafeArrayTypeMismatchException" can occur when running the client and server on separate machines. This issue arises due to improper handling of the packet's size and header.

Length-Prefixing

To resolve this issue, Proper length-prefixing should be implemented. This involves adding a fixed header to each packet that contains the length of the data being transmitted. The header format is as follows:

[Length (4 bytes)][Header (1 byte)][Data (x byte(s))]

Reading a Packet

To read a packet, the following steps are taken:

1. Read the first 4 bytes (Length), convert and assign them to an integer variable.
2. Read the next byte (the data header) and put that in a variable.
3. Read x bytes to a byte array (where x is the integer declared in step 1).
4. Use the data header from step 2 to determine the action to be taken with your data (the byte array from step 3).

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