简体繁体 English

包含数组的Struct的大小

[英]Size of a Struct containing an array

原文 2011-07-29 20:49:28 6 2 c#/ .net/ arrays/ struct/ union

I am using ac# struct as a pseudo-union (by using the LayoutKind.Explicit attribute), to pass network messages around my program. 我将ac＃struct用作伪联盟（通过使用LayoutKind.Explicit属性），以在程序周围传递网络消息。 I understand how to use the layout with the primitive types, as they are of a know size. 我知道如何将布局与基本类型一起使用，因为它们的大小已知。

However, how would I do this with one of the fields being a char array? 但是，我如何将其中一个字段作为char数组来执行此操作？ I know a char is 2 bytes of data (when in unicode format), but how big is char[]? 我知道一个char是2个字节的数据（采用Unicode格式时），但是char []有多大？ Am I correct in believing that this is a reference type, so its size is not just number of items * 2? 我是否认为这是引用类型是正确的，所以它的大小不仅仅是项目数* 2？

How would I layout the struct for this? 我将如何为此布局结构？ Is it even possible? 可能吗？

2 个解决方案

The size is the width of a reference; 大小是参考的宽度； so 4 bytes on x86 or 8 bytes on x64. 因此，x86上为4个字节，x64上为8个字节。 The size of the array is irrelevant, as the array is stored separately on the heap. 数组的大小无关紧要，因为该数组分别存储在堆中。 If you want to serialize that data to a byte stream, then it probably depends on which encoding you use for the char data. 如果要将该数据序列化为字节流，则可能取决于用于char数据的编码。 UTF16 would indeed be 2 * number of characters, but UTF8 or UTF32 will be different. UTF16的确是2 *个字符，但是UTF8或UTF32会有所不同。