How to loop through all the properties of a class

Question

I have a class   Public Class Foo     Private  Name As String     Public Property Name   As String         Get             Return  Name         End Get         Set ByVal value As String               Name   value         End Set     End Property      Private  Age As String     Public Property Age   As String         Get             Return  Age         End Get         Set ByVal value As String               Age   value         End Set     End Property      Private  ContactNumber As String     Public Property ContactNumber   As String         Get             Return  ContactNumber         End Get         Set ByVal value As String               ContactNumber   value         End Set     End Property   End Class   I want to loop through the properties of the above class  eg   Public Sub DisplayAll ByVal Someobject As Foo      For Each  Property As something In Someobject Properties         Console WriteLine  Property Name  amp       amp   Property value      Next End Sub

User · Answer

Here s another way to do it  using a LINQ lambda   C    SomeObject GetType   GetProperties   ToList   ForEach x   gt  Console WriteLine    x Name     x GetValue SomeObject  null         VB NET   SomeObject GetType GetProperties ToList ForEach Sub x  Console WriteLine    x Name     x GetValue SomeObject  Nothing

User · Answer

Reflection is pretty  quot heavy quot  Perhaps try this solution  C  if  item is IEnumerable        foreach  object o in item as IEnumerable                  do function         else       foreach  System Reflection PropertyInfo p in obj GetType   GetProperties                   if  p CanRead                Console WriteLine  quot  0    1  quot   p Name  p GetValue obj   null      possible function                    VB Net   If TypeOf item Is IEnumerable Then      For Each o As Object In TryCast item  IEnumerable                  Do Function      Next   Else     For Each p As System Reflection PropertyInfo In obj GetType   GetProperties            If p CanRead Then                Console WriteLine  quot  0    1  quot   p Name  p GetValue obj  Nothing     possible function           End If       Next   End If  Reflection slows down   - 1000 x the speed of a method call  shown in The Performance of Everyday Things

User · Answer

VB version of C  given by Brannon   Public Sub DisplayAll ByVal Someobject As Foo      Dim  type As Type   Someobject GetType       Dim properties   As PropertyInfo    type GetProperties     line 3     For Each  property As PropertyInfo In properties         Console WriteLine  Name       property Name      Value       property GetValue Someobject  Nothing       Next End Sub   Using Binding flags in instead of line no 3      Dim flags As BindingFlags   BindingFlags Public Or BindingFlags Instance     Dim properties   As PropertyInfo    type GetProperties flags

User · Answer

Use Reflection   Type type   obj GetType    PropertyInfo   properties   type GetProperties     foreach  PropertyInfo property in properties        Console WriteLine  Name      property Name      Value      property GetValue obj  null        for Excel - what tools reference item must be added to gain access to BindingFlags  as there is no  System Reflection  entry in the list  Edit  You can also specify a BindingFlags value to type GetProperties     BindingFlags flags   BindingFlags Public   BindingFlags Instance  PropertyInfo   properties   type GetProperties flags     That will restrict the returned properties to public instance properties  excluding static properties  protected properties  etc    You don t need to specify BindingFlags GetProperty  you use that when calling type InvokeMember   to get the value of a property

User · Answer

This is how I do it   foreach  var fi in typeof CustomRoles  GetFields          var propertyName   fi Name

User · Answer

private void ResetAllProperties                 Type type   this GetType            PropertyInfo   properties    from c in type GetProperties                                        where c Name StartsWith  Doc                                        select c  ToArray            foreach  PropertyInfo item in properties                        if  item PropertyType FullName     System String                   item SetValue this      null                     I used the code block above to reset all string properties in my web user control object which names are started with  Doc

User · Answer

Note that if the object you are talking about has a custom property model  such as DataRowView etc for DataTable   then you need to use TypeDescriptor  the good news is that this still works fine for regular classes  and can even be much quicker than reflection    foreach PropertyDescriptor prop in TypeDescriptor GetProperties obj         Console WriteLine   0     1    prop Name  prop GetValue obj        This also provides easy access to things like TypeConverter for formatting       string fmt   prop Converter ConvertToString prop GetValue obj

[.net] How to loop through all the properties of a class?

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