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 = (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 = (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 = p.GetValue(obj, null); str += p.Name + ":" + pValue + ";"; } else if (p.PropertyType.FullName == typeof(String).FullName) { Object pValue = 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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