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> 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> address = new list<address>()
           {
               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<address>).fullname)
               {
                   list<address> list = (list<address>)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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