read a binary to into a structure without packing in csharp

main.cs
byte[] binaryData = ...; // your binary data
MyStruct myStruct;

// get the size of the struct
int structSize = System.Runtime.InteropServices.Marshal.SizeOf(typeof(MyStruct));

// make sure that the binary data is large enough to contain the struct
if (binaryData.Length < structSize)
{
    throw new ArgumentException("Binary data is too small to contain a MyStruct.");
}

// allocate a pointer to the buffer
IntPtr buffer = System.Runtime.InteropServices.Marshal.AllocHGlobal(structSize);

try
{
    // copy the binary data into the buffer
    System.Runtime.InteropServices.Marshal.Copy(binaryData, 0, buffer, structSize);

    // read the struct from the buffer
    myStruct = (MyStruct)System.Runtime.InteropServices.Marshal.PtrToStructure(buffer, typeof(MyStruct));
}
finally
{
    // free the allocated memory
    System.Runtime.InteropServices.Marshal.FreeHGlobal(buffer);
}
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