c foreach property in object Is there a simple way of doing this

Question

I have a class containing several properties  all are strings if it makes any difference   I also have a list  which contains many different instances of the class   While creating some unit tests for my classes I decided I wanted to loop through each object in the list and then loop through each property of that object     I thought doing this would be as simple as     foreach  Object obj in theList         foreach  Property theProperties in obj                  do some stufff               But this didnt work     I get this error      foreach statement cannot operate on variables of type  Application Object  because  Application Object  does not contain a public definition for  GetEnumerator    Does anyone know of a way of doing this without tons of ifs and loops or without getting into anything too complex

User · Answer

I couldn t get any of the above ways to work  but this worked  The username and password for DirectoryEntry are optional      private List lt string gt  getAnyDirectoryEntryPropertyValue string userPrincipalName  string propertyToSearchFor                List lt string gt  returnValue   new List lt string gt             try                       int index   userPrincipalName IndexOf                   string originatingServer   userPrincipalName Remove 0  index   1               string path    LDAP       originatingServer             distinguishedName              DirectoryEntry objRootDSE   new DirectoryEntry path  PSUsername  PSPassword               var objSearcher   new System DirectoryServices DirectorySearcher objRootDSE               objSearcher Filter   string Format    amp  UserPrincipalName  0      userPrincipalName               SearchResultCollection properties   objSearcher FindAll                 ResultPropertyValueCollection resPropertyCollection   properties 0  Properties propertyToSearchFor               foreach  string resProperty in resPropertyCollection                                returnValue Add resProperty                                   catch  Exception ex                        returnValue Add ex Message               throw                     return returnValue

User · Answer

Sure  no problem   foreach object item in sequence        if  item    null  continue      foreach PropertyInfo property in item GetType   GetProperties                     do something with the property

User · Answer

Give this a try   foreach  PropertyInfo propertyInfo in obj GetType   GetProperties            do stuff here     Also please note that Type GetProperties   has an overload which accepts a set of binding flags so you can filter out properties on a different criteria like accessibility level  see MSDN for more details  Type GetProperties Method  BindingFlags  Last but not least don t forget to add the  system Reflection  assembly reference   For instance to resolve all public properties   foreach  var propertyInfo in obj GetType                                    GetProperties                                          BindingFlags Public                                            BindingFlags Instance           do stuff here     Please let me know whether this works as expected

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I looked for the answer to a similar question on this page  I wrote the answers to several similar questions that may help people who enter this page  Class List List  lt  T  gt  class represents the list of objects which can be accessed by index  It comes under the System Collection Generic namespace  List class can be used to create a collection of different types like integers  strings etc  List class also provides the methods to search  sort  and manipulate lists  Class with property  class TestClss       public string id   set  get        public string cell1   set  get        public string cell2   set  get      var MyArray   new List lt TestClss gt        new TestClss     id    quot 1 quot   cell1    quot cell 1 row 1 Data quot   cell2    quot cell 2 row 1 Data quot         new TestClss     id    quot 2 quot   cell1    quot cell 1 row 2 Data quot   cell2    quot cell 2 row 2 Data quot         new TestClss     id    quot 3 quot   cell1    quot cell 1 row 2 Data quot   cell2    quot cell 2 row 3 Data quot       foreach  object Item in MyArray        Console WriteLine  quot Row Start quot        foreach  PropertyInfo property in Item GetType   GetProperties                  var Key   property Name          var Value   property GetValue Item  null           Console WriteLine  quot  0   1  quot   Key  Value            OR  Class with field  class TestClss       public string id    quot  quot       public string cell1    quot  quot       public string cell2    quot  quot     var MyArray   new List lt TestClss gt        new TestClss     id    quot 1 quot   cell1    quot cell 1 row 1 Data quot   cell2    quot cell 2 row 1 Data quot         new TestClss     id    quot 2 quot   cell1    quot cell 1 row 2 Data quot   cell2    quot cell 2 row 2 Data quot         new TestClss     id    quot 3 quot   cell1    quot cell 1 row 2 Data quot   cell2    quot cell 2 row 3 Data quot       foreach  object Item in MyArray        Console WriteLine  quot Row Start quot        foreach  var fieldInfo in Item GetType   GetFields                  var Key   fieldInfo Name          var Value   fieldInfo GetValue Item             OR  List of objects  without same cells   var MyArray   new List lt object gt        new   id    quot 1 quot   cell1    quot cell 1 row 1 Data quot   cell2    quot cell 2 row 1 Data quot         new   id    quot 2 quot   cell1    quot cell 1 row 2 Data quot   cell2    quot cell 2 row 2 Data quot         new   id    quot 3 quot   cell1    quot cell 1 row 2 Data quot   cell2    quot cell 2 row 3 Data quot   anotherCell    quot  quot       foreach  object Item in MyArray        Console WriteLine  quot Row Start quot        foreach  var props in Item GetType   GetProperties                  var Key   props Name          var Value   props GetMethod Invoke Item  null  ToString            Console WriteLine  quot  0   1  quot   Key  Value            OR  List of objects  It must have the same cells   var MyArray   new         new   id    quot 1 quot   cell1    quot cell 1 row 1 Data quot   cell2    quot cell 2 row 1 Data quot         new   id    quot 2 quot   cell1    quot cell 1 row 2 Data quot   cell2    quot cell 2 row 2 Data quot         new   id    quot 3 quot   cell1    quot cell 1 row 2 Data quot   cell2    quot cell 2 row 3 Data quot       foreach  object Item in MyArray        Console WriteLine  quot Row Start quot        foreach  var props in Item GetType   GetProperties                  var Key   props Name          var Value   props GetMethod Invoke Item  null  ToString            Console WriteLine  quot  0   1  quot   Key  Value            OR  List of objects  with key   var MyArray   new       row1   new   id    quot 1 quot   cell1    quot cell 1 row 1 Data quot   cell2    quot cell 2 row 1 Data quot         row2   new   id    quot 2 quot   cell1    quot cell 1 row 2 Data quot   cell2    quot cell 2 row 2 Data quot         row3   new   id    quot 3 quot   cell1    quot cell 1 row 2 Data quot   cell2    quot cell 2 row 3 Data quot          using System ComponentModel   for TypeDescriptor foreach  PropertyDescriptor Item in TypeDescriptor GetProperties MyArray         string Rowkey   Item Name      object RowValue   Item GetValue MyArray       Console WriteLine  quot Row key is   0  quot   Rowkey       foreach  var props in RowValue GetType   GetProperties                  var Key   props Name          var Value   props GetMethod Invoke RowValue  null  ToString            Console WriteLine  quot  0   1  quot   Key  Value            OR  List of Dictionary var MyArray   new List lt Dictionary lt string  string gt  gt          new Dictionary lt string  string gt         quot id quot    quot 1 quot        quot cell1 quot    quot cell 1 row 1 Data quot        quot cell2 quot    quot cell 2 row 1 Data quot           new Dictionary lt string  string gt         quot id quot    quot 2 quot        quot cell1 quot    quot cell 1 row 2 Data quot        quot cell2 quot    quot cell 2 row 2 Data quot           new Dictionary lt string  string gt         quot id quot    quot 3 quot        quot cell1 quot    quot cell 1 row 3 Data quot        quot cell2 quot    quot cell 2 row 3 Data quot         foreach  Dictionary lt string  string gt  Item in MyArray        Console WriteLine  quot Row Start quot        foreach  KeyValuePair lt string  string gt  props in Item                var Key   props Key          var Value   props Value          Console WriteLine  quot  0   1  quot   Key  Value            Good luck

User · Answer

Your e almost there  you just need to get the properties from the type  rather than expect the properties to be accessible in the form of a collection or property bag   var property in obj GetType   GetProperties     From there you can access like so   property Name property GetValue obj  null    With GetValue the second parameter will allow you to specify index values  which will work with properties returning collections - since a string is a collection of chars  you can also specify an index to return a character if needs be

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A copy-paste solution  extension methods  mostly based on earlier responses to this question    Also properly handles IDicitonary  ExpandoObject dynamic  which is often needed when dealing with this reflected stuff   Not recommended for use in tight loops and other hot paths  In those cases you re gonna need some caching IL emit expression tree compilation       public static IEnumerable lt  string Name  object Value  gt  GetProperties this object src                if  src is IDictionary lt string  object gt  dictionary                        return dictionary Select x   gt   x Key  x Value                      return src GetObjectProperties   Select x   gt   x Name  x GetValue src                public static IEnumerable lt PropertyInfo gt  GetObjectProperties this object src                return src GetType                GetProperties BindingFlags Public   BindingFlags Instance               Where p   gt   p GetGetMethod   GetParameters   Any

User · Answer

You can loop through all non-indexed properties of an object like this   var s   new MyObject    foreach  var p in s GetType   GetProperties   Where p   gt   p GetGetMethod   GetParameters   Any           Console WriteLine p GetValue s  null        Since GetProperties   returns indexers as well as simple properties  you need an additional filter before calling GetValue to know that it is safe to pass null as the second parameter   You may need to modify the filter further in order to weed out write-only and otherwise inaccessible properties

User · Answer

Use Reflection to do this  SomeClass A   SomeClass      PropertyInfo   properties   A GetType   GetProperties

User · Answer

A small word of caution  if  do some stuff  means updating the value of the actual property that you visit AND if there is a struct type property along the path from root object to the visited property  the change you made on the property will not be reflected on the root object

[c#] c# foreach (property in object)... Is there a simple way of doing this?

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