C#|C# PropertyInfo类案例详解 C#PropertyInfo类案例详解

对一个对象进行属性分析，并得到相应的属性值，并判断属性的默认值以及空值

public class People{public string name { get; set; }public int age { get; set; }public DateTime birthday { get; set; }public bool isActive { get; set; }public List address{get; set; }}public class Address{public string country { get; set; }public string province { get; set; }public string city { get; set; }}class Program{static void Main(string[] args){List address = new List(){new Address(){country="china",province="anHui",city="bengBu",},new Address(){country="china",city="shangHai",},}; People people = new People(){name="wangqilong",age=23,birthday=Convert.ToDateTime("2018-09-15"),isActive=true,address=address}; string str = method(people); }public static string method(Object obj){string str = ""; Type postType = obj.GetType(); PropertyInfo[] postTypeInfos = postType.GetProperties(); //返回为当前 Type 的所有公共属性,PropertyInfo[] PropertyInfo 的所有公共属性的 Type 对象数组foreach (PropertyInfo p in postTypeInfos){if (p.PropertyType.FullName == typeof(DateTime).FullName){DateTime pValue = https://www.it610.com/article/(DateTime)p.GetValue(obj, null); if (pValue != null && pValue != DateTime.MinValue)//dateTime类型申明时默认值为最小值{str += p.Name +":" + pValue + "; "; }}else if (p.PropertyType.FullName == typeof(Int32).FullName){int pValue = https://www.it610.com/article/(int)p.GetValue(obj, null); if (pValue != 0)//int类型申明时默认值为最小值0{str += p.Name +":" + pValue + "; "; }}else if (p.PropertyType.FullName == typeof(Boolean).FullName){Object pValue = https://www.it610.com/article/p.GetValue(obj, null); str += p.Name +":" + pValue + "; "; }else if (p.PropertyType.FullName == typeof(String).FullName){Object pValue = https://www.it610.com/article/p.GetValue(obj, null); str += p.Name +":" + pValue + "; "; }//如果传入的对象包含集合，集合中是另个对象else if (p.PropertyType.FullName == typeof(List).FullName){List list = (List)p.GetValue(obj, null); if (list != null){foreach (Address address in list){str += p.Name + ":" + address.country+","+address.province+","+address.city + "; "; }}}}return str; }}

结果：”name:wangqilong; age:23; birthday:2018/9/15 0:00:00; isActive:True; address:china,anHui,bengBu; address:china,,shangHai; ”
关于PropertyInfo类信息: https://docs.microsoft.com/zh-cn/dotnet/api/system.reflection.propertyinfo?view=netframework-1.1
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