Question

I have the following classes:

public class Person {     public String FirstName { set; get; }     public String LastName { set; get; }     public Role Role { set; get; } }  public class Role {     public String Description { set; get; }     public Double Salary { set; get; }     public Boolean HasBonus { set; get; } } 

I want to be able to automatically extract the property value diferences between Person1 and Person2, example as below:

public static List<String> DiffObjectsProperties(T a, T b) {     List<String> differences = new List<String>();     foreach (var p in a.GetType().GetProperties())     {         var v1 = p.GetValue(a, null);         var v2 = b.GetType().GetProperty(p.Name).GetValue(b, null);          /* What happens if property type is a class e.g. Role???          * How do we extract property values of Role?          * Need to come up a better way than using .Namespace != 'System'          */         if (!v1.GetType()             .Namespace             .Equals('System', StringComparison.OrdinalIgnoreCase))             continue;          //add values to differences List     }      return differences; } 

How can I extract property values of Role in Person???

Answer 1

public static List<String> DiffObjectsProperties(object a, object b) {     Type type = a.GetType();     List<String> differences = new List<String>();     foreach (PropertyInfo p in type.GetProperties())     {         object aValue = p.GetValue(a, null);         object bValue = p.GetValue(b, null);          if (p.PropertyType.IsPrimitive || p.PropertyType == typeof(string))         {             if (!aValue.Equals(bValue))                 differences.Add(                     String.Format('{0}:{1}!={2}',p.Name, aValue, bValue)                 );         }         else             differences.AddRange(DiffObjectsProperties(aValue, bValue));     }      return differences; }