使用char进行C#互操作时，如何封送从函数返回长度的字符数组？

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct InteropData
{
    public int Length;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 100)]
    public char[] Data;
}

[DllImport("YourLibrary.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern InteropData YourFunction();

InteropData result = YourFunction();

char[] data = new char[result.Length];
Array.Copy(result.Data, data, result.Length);