Get properties and values from unknown object

Question

From the world of PHP I have decided to give C  a go  I ve had a search but can t seem to find the answer of how to do the equivalent to this    object   new Object      vars   get class vars get class  object     foreach  vars as  var        doSomething  object- gt  var       I basically have a List of an object  The object could be one of three different types and will have a set of public properties  I want to be able to get a list of the properties for the object  loop over them and then write them out to a file  I m thinking this has something to do with c  reflection but it s all new to me   Any help would be greatly appreciated

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public Dictionary lt string  string gt  ToDictionary object obj        Dictionary lt string  string gt  dictionary   new Dictionary lt string  string gt          Type objectType   obj GetType        IList lt PropertyInfo gt  props   new List lt PropertyInfo gt  objectType GetProperties          foreach  PropertyInfo prop in props                object propValue   prop GetValue obj  null           dictionary Add prop Name  propValue ToString                return dictionary

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get set value field in object to object new  two object  field like         public static void SetValueObjectToObject  object sourceObj   object resultObj                IList lt PropertyInfo gt  props   new List lt PropertyInfo gt  sourceObj GetType   GetProperties             foreach  PropertyInfo prop in props                        try                                 get value in sourceObj                 object propValue   prop GetValue sourceObj  null                     set value in resultObj                 PropertyInfo propResult   resultObj GetType   GetProperty prop Name  BindingFlags Public   BindingFlags Instance                   if  propResult    null  amp  amp  propResult CanWrite                                        propResult SetValue resultObj  propValue  null                                               catch  Exception ex                                     do something with Ex

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Here s something I use to transform an IEnumerable lt T gt  into a DataTable that contains columns representing T s properties  with one row for each item in the IEnumerable   public static DataTable ToDataTable lt T gt  IEnumerable lt T gt  items        var table   CreateDataTableForPropertiesOfType lt T gt         PropertyInfo   piT   typeof T  GetProperties        foreach  var item in items                var dr   table NewRow            for  int property   0  property  lt  table Columns Count  property                          if  piT property  CanRead                                var value   piT property  GetValue item  null                   if  piT property  PropertyType IsGenericType                                        if  value    null                                                dr property    DBNull Value                                            else                                               dr property    piT property  GetValue item  null                                                           else                                       dr property    piT property  GetValue item  null                                                     table Rows Add dr             return table     public static DataTable CreateDataTableForPropertiesOfType lt T gt          DataTable dt   new DataTable        PropertyInfo   piT   typeof T  GetProperties        foreach  PropertyInfo pi in piT                Type propertyType   null          if  pi PropertyType IsGenericType                        propertyType   pi PropertyType GetGenericArguments   0                     else                       propertyType   pi PropertyType                    DataColumn dc   new DataColumn pi Name  propertyType            if  pi CanRead                        dt Columns Add dc                       return dt      This is  somewhat  overcomplicated  but it s actually quite good for seeing what the outcome is  as you can give it a List lt T gt  of  for example   public class Car       string Make   get  set        int YearOfManufacture  get  set        And you ll be returned a DataTable with the structure      Make  string     YearOfManufacture  int    With one row per item in your List lt Car gt

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Yes  Reflection would be the way to go   First  you would get the Type that represents the type  at runtime  of the instance in the list   You can do this by calling the GetType method on Object   Because it is on the Object class  it s callable by every object in  NET  as all types derive from Object  well  technically  not everything  but that s not important here    Once you have the Type instance  you can call the GetProperties method to get the PropertyInfo instances which represent the run-time informationa about the properties on the Type   Note  you can use the overloads of GetProperties to help classify which properties you retrieve   From there  you would just write the information out to a file   Your code above  translated  would be      The instance  it can be of any type  object o    lt some object gt       Get the type  Type type   o GetType        Get all public instance properties     Use the override if you want to classify    which properties to return  foreach  PropertyInfo info in type GetProperties             Do something with the property info      DoSomething info       Note that if you want method information or field information  you would have to call the one of the overloads of the GetMethods or GetFields methods respectively   Also note  it s one thing to list out the members to a file  but you shouldn t use this information to drive logic based on property sets   Assuming you have control over the implementations of the types  you should derive from a common base class or implement a common interface and make the calls on those  you can use the as or is operator to help determine which base class interface you are working with at runtime    However  if you don t control these type definitions and have to drive logic based on pattern matching  then that s fine

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This example trims all the string properties of an object    public static void TrimModelProperties Type type  object obj        var propertyInfoArray   type GetProperties                                      BindingFlags Public                                        BindingFlags Instance       foreach  var propertyInfo in propertyInfoArray                var propValue   propertyInfo GetValue obj  null           if  propValue    null               continue          if  propValue GetType   Name     String               propertyInfo SetValue                               obj                                  string propValue  Trim                                  null

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void Test        var obj   new a  aaa   b  bbb         var val a   obj GetValObjDy  a        aaa      var val b   obj GetValObjDy  b        bbb      create in a static class static public object GetValObjDy this object obj  string propertyName                     return obj GetType   GetProperty propertyName  GetValue obj  null

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You can try this   string   arr     IEnumerable obj  Cast lt object gt                                      Select x   gt  x ToString                                      ToArray      Once every array implements IEnumerable interface

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well  in C  it s similar  Here s one of the simplest examples  only for public properties   var someObject   new        properties         var propertyInfos   someObject GetType   GetProperties    foreach  PropertyInfo pInfo in propertyInfos        string propertyName   pInfo Name    gets the name of the property     doSomething pInfo GetValue someObject null

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You can use GetType - GetProperties - Linq Foreach   obj GetType   GetProperties   ToList   ForEach p   gt                                                             p is each PropertyInfo                                                         DoSomething p

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This should do it   Type myType   myObject GetType    IList lt PropertyInfo gt  props   new List lt PropertyInfo gt  myType GetProperties      foreach  PropertyInfo prop in props        object propValue   prop GetValue myObject  null           Do something with propValue

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One line solution using Linq     var obj   new  Property1  1  Property2  2   var property1   obj GetType   GetProperties   First o   gt  o Name     Property1   GetValue obj   null

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I haven t found this to work on  say Application objects  I have however had success with  var serializer   new System Web Script Serialization JavaScriptSerializer     string rval   serializer Serialize myAppObj

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To get specific property value from property name  public class Bike  public string Name  get set      Bike b   new Bike  Name    MyBike      to access property value of Name from string name of property   public object GetPropertyValue string propertyName      returns value of property Name return this GetType   GetProperty propertyName  GetValue this  null

[c#] Get properties and values from unknown object

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