无法封送类型，因为嵌入式数组实例的长度与布局中声明的长度不匹配

Question

这些是我的结构

[StructLayout(LayoutKind.Sequential)]
public struct DeptDetails
{
    [MarshalAs(UnmanagedType.I4)]
    public int depid;
    [MarshalAs(UnmanagedType.I2)]
    public short noemp;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
    public empDetails[] emp;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 8)]
    public string deptname;
}

[StructLayout(LayoutKind.Sequential)]
public struct empDetails
{
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 4)]
    public string empname;
    [MarshalAs(UnmanagedType.I4)]
    public int empid;
}

我通过套接字发送它

structures.DeptDetails Details = new structures.DeptDetails();
Details.depid = 123;
Details.noemp= 3;
Details.emp= new structures.empDetails[Details.noemp];

Details.emp[0].empname= "xyz"; 
Details.emp[0].empid= 1;

Details.scrips[1].empname="abc"
Details.scrips[1].empid = 2;

Details.scrips[2].empname= "pqr"
Details.scrips[2].empid= 6;

Details.deptname= "PYTHON";
int bytesSend = senderSock.Send(MainModule.struc.StructureToByteArray(Details));

StructureToByteArray 方法包含：

public byte[] StructureToByteArray(object obj)
{
    int len = Marshal.SizeOf(obj);
    byte[] arr = new byte[len];
    IntPtr ptr = Marshal.AllocHGlobal(len);
    Marshal.StructureToPtr(obj, ptr, true);
    Marshal.Copy(ptr, arr, 0, len);
    Marshal.FreeHGlobal(ptr);
    return arr;
}

但是我无法发送数据... 我的例外是：

Type could not be marshaled because the length of an embedded array instance does not match the declared length in the layout.

Answer 1

异常很明显：

...the length of an embedded array instance does not match the declared length in the layout

因此，您实例化了一个与声明的大小不同的数组（声明为 8，实例化为 3），因此无法对其进行编组。

无法封送类型，因为嵌入式数组实例的长度与布局中声明的长度不匹配

Type could not be marshaled because the length of an embedded array instance does not match the declared length in the layout

c#

dynamic-arrays

data-structures