C# MarshalAsAttribute Sizeconst.NET

使用C，有人知道如何在运行时获取MarshalAsAttribute的Sizeconst值吗

我想取10的值

[StructLayout[LayoutKind.Sequential, Pack=1]
Class StructureToMarshalFrom
{
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 10)]
    public byte[] _value1;
}

是的，带着反思：

FieldInfo field = typeof(StructureToMarshalFrom).GetField("_value1");
object[] attributes = field.GetCustomAttributes(typeof(MarshalAsAttribute), false);
MarshalAsAttribute marshal = (MarshalAsAttribute) attributes[0];
int sizeConst = marshal.SizeConst;

未经测试，显然缺少大量的错误检查，但应该可以工作。

是的，有反射：

FieldInfo field = typeof(StructureToMarshalFrom).GetField("_value1");
object[] attributes = field.GetCustomAttributes(typeof(MarshalAsAttribute), false);
MarshalAsAttribute marshal = (MarshalAsAttribute) attributes[0];
int sizeConst = marshal.SizeConst;

var x = new StructureToMarshalFrom();
var fields = x.GetType().GetFields();

var att = (MarshalAsAttribute[])fields[0].GetCustomAttributes(typeof(MarshalAsAttribute), false);
if (att.Length > 0) {
    Console.WriteLine(att[0].SizeConst);
}

未经测试，显然缺乏大量的错误检查，但应该可以工作

var x = new StructureToMarshalFrom();
var fields = x.GetType().GetFields();

var att = (MarshalAsAttribute[])fields[0].GetCustomAttributes(typeof(MarshalAsAttribute), false);
if (att.Length > 0) {
    Console.WriteLine(att[0].SizeConst);
}