如何获得对象具有的属性计数? [英] How do I get the count of attributes that an object has?

问题描述

我有一个带有许多属性的类，我需要找到一种方法来对它具有的属性数量进行计数.我要这样做是因为该类读取CSV文件，并且如果属性(csvcolumns)的数量小于文件中的列数，则需要进行特殊处理.这是我的班级示例:

I've got a class with a number of attributes, and I need to find a way to get a count of the number of attributes it has. I want to do this because the class reads a CSV file, and if the number of attributes (csvcolumns) is less than the number of columns in the file, special things will need to happen. Here is a sample of what my class looks like:

    public class StaffRosterEntry : RosterEntry
    {
        [CsvColumn(FieldIndex = 0, Name = "Role")]
        public string Role { get; set; }

        [CsvColumn(FieldIndex = 1, Name = "SchoolID")]
        public string SchoolID { get; set; }

        [CsvColumn(FieldIndex = 2, Name = "StaffID")]
        public string StaffID { get; set; }
    }

我尝试这样做:

var a = Attribute.GetCustomAttributes(typeof(StaffRosterEntry));
var attributeCount = a.Count();

但这失败了.非常感谢您提供的任何帮助(指向某些文档的链接，其他答案或简单的建议)！

But this failed miserably. Any help you could give (links to some docs, or other answers, or simply suggestions) is greatly appreciated!

推荐答案

由于属性位于属性上，因此您必须获取每个属性的属性:

Since the attributes are on the properties, you would have to get the attributes on each property:

Type type = typeof(StaffRosterEntry);
int attributeCount = 0;
foreach(PropertyInfo property in type.GetProperties())
{
 attributeCount += property.GetCustomAttributes(false).Length;
}

这篇关于如何获得对象具有的属性计数?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！