将带有doubles的C结构编组为C# -正值错误

using System;
using System.Runtime.InteropServices;

// 定义C结构体
[StructLayout(LayoutKind.Sequential)]
struct CStruct
{
    public double value;
}

class Program
{
    static void Main(string[] args)
    {
        // 创建C结构体实例
        CStruct cStruct = new CStruct();
        cStruct.value = 3.14;

        // 将C结构体转换为字节数组
        byte[] bytes = new byte[Marshal.SizeOf(cStruct)];
        IntPtr ptr = Marshal.AllocHGlobal(Marshal.SizeOf(cStruct));
        Marshal.StructureToPtr(cStruct, ptr, false);
        Marshal.Copy(ptr, bytes, 0, Marshal.SizeOf(cStruct));
        Marshal.FreeHGlobal(ptr);

        // 将字节数组转换为C#结构体
        GCHandle handle = GCHandle.Alloc(bytes, GCHandleType.Pinned);
        CStruct csStruct = (CStruct)Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(CStruct));
        handle.Free();

        // 输出双精度浮点数值
        Console.WriteLine(csStruct.value);
    }
}