Getting all types in a namespace via reflection

Question

How do you get all the classes in a namespace through reflection in C

User · Answer

Following code prints names of classes in specified namespace defined in current assembly.
As other guys pointed out, a namespace can be scattered between different modules, so you need to get a list of assemblies first.

string nspace = "...";

var q = from t in Assembly.GetExecutingAssembly().GetTypes()
        where t.IsClass && t.Namespace == nspace
        select t;
q.ToList().ForEach(t => Console.WriteLine(t.Name));

User · Answer

Namespaces are actually rather passive in the design of the runtime and serve primarily as organizational tools  The Full Name of a type in  NET consists of the Namespace and Class Enum Etc  combined  If you only wish to go through a specific assembly  you would simply loop through the types returned by assembly GetExportedTypes   checking the value of type Namespace  If you were trying to go through all assemblies loaded in the current AppDomain it would involve using AppDomain CurrentDomain GetAssemblies

User · Answer

You won t be able to get all types in a namespace  because a namespace can bridge multiple assemblies  but you can get all classes in an assembly and check to see if they belong to that namespace   Assembly GetTypes   works on the local assembly  or you can load an assembly first then call GetTypes   on it

User · Answer

Get all classes by part of Namespace name in just one row   var allClasses   Assembly GetExecutingAssembly   GetTypes   Where a   gt  a IsClass  amp  amp  a Namespace    null  amp  amp  a Namespace Contains     your namespace       ToList

User · Answer

For a specific Assembly  NameSpace and ClassName   var assemblyName    Some Assembly Name  var nameSpace    Some Namespace Name   var className    ClassNameFilter    var asm   Assembly Load assemblyName   var classes   asm GetTypes   Where p   gt       p Namespace    nameSpace  amp  amp       p Name Contains className     ToList      Note  The project must reference the assembly

User · Answer

Just like  aku answer  but using extension methods   string  namespace           var types   Assembly GetExecutingAssembly   GetTypes        Where t   gt  t IsClass  amp  amp  t Namespace     namespace       ToList     types ForEach t   gt  Console WriteLine t Name

User · Answer

a simple combined code snippet   using System  using System Collections Generic  using System Linq  using System Text  using System Reflection   namespace MustHaveAttributes     class Program         static void Main   string   args               Console WriteLine     START                what is in the assembly       Assembly a   Assembly Load    MustHaveAttributes           Type   types   a GetTypes           foreach  Type t in types                   Console WriteLine    Type is  0    t                  Console WriteLine              0  types found   types Length            region Linq          region Action           string  namespace    MustHaveAttributes            var q   from t in Assembly GetExecutingAssembly    GetTypes                    where t IsClass  amp  amp  t Namespace     namespace                 select t          q ToList    ForEach   t   gt  Console WriteLine   t Name                 endregion Action          endregion        Console ReadLine           Console WriteLine     HIT A KEY TO EXIT            Console WriteLine     END                  eof Program     class ClassOne            eof class     class ClassTwo            eof class      System AttributeUsage   System AttributeTargets Class       System AttributeTargets Struct  AllowMultiple   true      public class AttributeClass   System Attribute          public string MustHaveDescription   get  set        public string MusHaveVersion   get  set          public AttributeClass   string mustHaveDescription  string mustHaveVersion               MustHaveDescription   mustHaveDescription        MusHaveVersion   mustHaveVersion               eof class       eof namespace

User · Answer

Here s a fix for LoaderException errors you re likely to find if one of the types sublasses a type in another assembly      Setup event handler to resolve assemblies AppDomain CurrentDomain ReflectionOnlyAssemblyResolve    new ResolveEventHandler CurrentDomain ReflectionOnlyAssemblyResolve    Assembly a   System Reflection Assembly ReflectionOnlyLoadFrom filename   a GetTypes       process types here     method later in the class  static Assembly CurrentDomain ReflectionOnlyAssemblyResolve object sender  ResolveEventArgs args        return System Reflection Assembly ReflectionOnlyLoad args Name       That should help with loading types defined in other assemblies   Hope that helps

User · Answer

Namespaces are actually rather passive in the design of the runtime and serve primarily as organizational tools  The Full Name of a type in  NET consists of the Namespace and Class Enum Etc  combined  If you only wish to go through a specific assembly  you would simply loop through the types returned by assembly GetExportedTypes   checking the value of type Namespace  If you were trying to go through all assemblies loaded in the current AppDomain it would involve using AppDomain CurrentDomain GetAssemblies

User · Answer

Namespaces are actually rather passive in the design of the runtime and serve primarily as organizational tools  The Full Name of a type in  NET consists of the Namespace and Class Enum Etc  combined  If you only wish to go through a specific assembly  you would simply loop through the types returned by assembly GetExportedTypes   checking the value of type Namespace  If you were trying to go through all assemblies loaded in the current AppDomain it would involve using AppDomain CurrentDomain GetAssemblies

User · Answer

using System Reflection  using System Collections Generic         static List lt string gt  GetClasses string nameSpace        Assembly asm   Assembly GetExecutingAssembly         List lt string gt  namespacelist   new List lt string gt         List lt string gt  classlist   new List lt string gt          foreach  Type type in asm GetTypes                  if  type Namespace    nameSpace              namespacelist Add type Name              foreach  string classname in namespacelist          classlist Add classname        return classlist      NB  The above code illustrates what s going on   Were you to implement it  a simplified version can be used   using System Linq  using System Reflection  using System Collections Generic         static IEnumerable lt string gt  GetClasses string nameSpace        Assembly asm   Assembly GetExecutingAssembly        return asm GetTypes            Where type   gt  type Namespace    nameSpace           Select type   gt  type Name

User · Answer

For a specific Assembly  NameSpace and ClassName   var assemblyName    Some Assembly Name  var nameSpace    Some Namespace Name   var className    ClassNameFilter    var asm   Assembly Load assemblyName   var classes   asm GetTypes   Where p   gt       p Namespace    nameSpace  amp  amp       p Name Contains className     ToList      Note  The project must reference the assembly

User · Answer

As FlySwat says  you can have the same namespace spanning in multiple assemblies  for eg System Collections Generic   You will have to load all those assemblies if they are not already loaded  So for a complete answer   AppDomain CurrentDomain GetAssemblies                           SelectMany t   gt  t GetTypes                            Where t   gt  t IsClass  amp  amp  t Namespace     namespace    This should work unless you want classes of other domains  To get a list of all domains  follow this link

User · Answer

You won t be able to get all types in a namespace  because a namespace can bridge multiple assemblies  but you can get all classes in an assembly and check to see if they belong to that namespace   Assembly GetTypes   works on the local assembly  or you can load an assembly first then call GetTypes   on it

User · Answer

Here s a fix for LoaderException errors you re likely to find if one of the types sublasses a type in another assembly      Setup event handler to resolve assemblies AppDomain CurrentDomain ReflectionOnlyAssemblyResolve    new ResolveEventHandler CurrentDomain ReflectionOnlyAssemblyResolve    Assembly a   System Reflection Assembly ReflectionOnlyLoadFrom filename   a GetTypes       process types here     method later in the class  static Assembly CurrentDomain ReflectionOnlyAssemblyResolve object sender  ResolveEventArgs args        return System Reflection Assembly ReflectionOnlyLoad args Name       That should help with loading types defined in other assemblies   Hope that helps

User · Answer

Here s a fix for LoaderException errors you re likely to find if one of the types sublasses a type in another assembly      Setup event handler to resolve assemblies AppDomain CurrentDomain ReflectionOnlyAssemblyResolve    new ResolveEventHandler CurrentDomain ReflectionOnlyAssemblyResolve    Assembly a   System Reflection Assembly ReflectionOnlyLoadFrom filename   a GetTypes       process types here     method later in the class  static Assembly CurrentDomain ReflectionOnlyAssemblyResolve object sender  ResolveEventArgs args        return System Reflection Assembly ReflectionOnlyLoad args Name       That should help with loading types defined in other assemblies   Hope that helps

User · Answer

Quite simple  Type   types   Assembly Load new AssemblyName  mynamespace folder    GetTypes    foreach  var item in types

User · Answer

using System Reflection  using System Collections Generic         static List lt string gt  GetClasses string nameSpace        Assembly asm   Assembly GetExecutingAssembly         List lt string gt  namespacelist   new List lt string gt         List lt string gt  classlist   new List lt string gt          foreach  Type type in asm GetTypes                  if  type Namespace    nameSpace              namespacelist Add type Name              foreach  string classname in namespacelist          classlist Add classname        return classlist      NB  The above code illustrates what s going on   Were you to implement it  a simplified version can be used   using System Linq  using System Reflection  using System Collections Generic         static IEnumerable lt string gt  GetClasses string nameSpace        Assembly asm   Assembly GetExecutingAssembly        return asm GetTypes            Where type   gt  type Namespace    nameSpace           Select type   gt  type Name

User · Answer

Here s a fix for LoaderException errors you re likely to find if one of the types sublasses a type in another assembly      Setup event handler to resolve assemblies AppDomain CurrentDomain ReflectionOnlyAssemblyResolve    new ResolveEventHandler CurrentDomain ReflectionOnlyAssemblyResolve    Assembly a   System Reflection Assembly ReflectionOnlyLoadFrom filename   a GetTypes       process types here     method later in the class  static Assembly CurrentDomain ReflectionOnlyAssemblyResolve object sender  ResolveEventArgs args        return System Reflection Assembly ReflectionOnlyLoad args Name       That should help with loading types defined in other assemblies   Hope that helps

User · Answer

Following code prints names of classes in specified namespace defined in current assembly.
As other guys pointed out, a namespace can be scattered between different modules, so you need to get a list of assemblies first.

string nspace = "...";

var q = from t in Assembly.GetExecutingAssembly().GetTypes()
        where t.IsClass && t.Namespace == nspace
        select t;
q.ToList().ForEach(t => Console.WriteLine(t.Name));

User · Answer

Just like  aku answer  but using extension methods   string  namespace           var types   Assembly GetExecutingAssembly   GetTypes        Where t   gt  t IsClass  amp  amp  t Namespace     namespace       ToList     types ForEach t   gt  Console WriteLine t Name

User · Answer

Get all classes by part of Namespace name in just one row   var allClasses   Assembly GetExecutingAssembly   GetTypes   Where a   gt  a IsClass  amp  amp  a Namespace    null  amp  amp  a Namespace Contains     your namespace       ToList

User · Answer

You won t be able to get all types in a namespace  because a namespace can bridge multiple assemblies  but you can get all classes in an assembly and check to see if they belong to that namespace   Assembly GetTypes   works on the local assembly  or you can load an assembly first then call GetTypes   on it

User · Answer

Quite simple  Type   types   Assembly Load new AssemblyName  mynamespace folder    GetTypes    foreach  var item in types

User · Answer

As FlySwat says  you can have the same namespace spanning in multiple assemblies  for eg System Collections Generic   You will have to load all those assemblies if they are not already loaded  So for a complete answer   AppDomain CurrentDomain GetAssemblies                           SelectMany t   gt  t GetTypes                            Where t   gt  t IsClass  amp  amp  t Namespace     namespace    This should work unless you want classes of other domains  To get a list of all domains  follow this link

User · Answer

You won t be able to get all types in a namespace  because a namespace can bridge multiple assemblies  but you can get all classes in an assembly and check to see if they belong to that namespace   Assembly GetTypes   works on the local assembly  or you can load an assembly first then call GetTypes   on it

User · Answer

using System Reflection  using System Collections Generic         static List lt string gt  GetClasses string nameSpace        Assembly asm   Assembly GetExecutingAssembly         List lt string gt  namespacelist   new List lt string gt         List lt string gt  classlist   new List lt string gt          foreach  Type type in asm GetTypes                  if  type Namespace    nameSpace              namespacelist Add type Name              foreach  string classname in namespacelist          classlist Add classname        return classlist      NB  The above code illustrates what s going on   Were you to implement it  a simplified version can be used   using System Linq  using System Reflection  using System Collections Generic         static IEnumerable lt string gt  GetClasses string nameSpace        Assembly asm   Assembly GetExecutingAssembly        return asm GetTypes            Where type   gt  type Namespace    nameSpace           Select type   gt  type Name

User · Answer

Namespaces are actually rather passive in the design of the runtime and serve primarily as organizational tools  The Full Name of a type in  NET consists of the Namespace and Class Enum Etc  combined  If you only wish to go through a specific assembly  you would simply loop through the types returned by assembly GetExportedTypes   checking the value of type Namespace  If you were trying to go through all assemblies loaded in the current AppDomain it would involve using AppDomain CurrentDomain GetAssemblies

User · Answer

Following code prints names of classes in specified namespace defined in current assembly.
As other guys pointed out, a namespace can be scattered between different modules, so you need to get a list of assemblies first.

string nspace = "...";

var q = from t in Assembly.GetExecutingAssembly().GetTypes()
        where t.IsClass && t.Namespace == nspace
        select t;
q.ToList().ForEach(t => Console.WriteLine(t.Name));

User · Answer

a simple combined code snippet   using System  using System Collections Generic  using System Linq  using System Text  using System Reflection   namespace MustHaveAttributes     class Program         static void Main   string   args               Console WriteLine     START                what is in the assembly       Assembly a   Assembly Load    MustHaveAttributes           Type   types   a GetTypes           foreach  Type t in types                   Console WriteLine    Type is  0    t                  Console WriteLine              0  types found   types Length            region Linq          region Action           string  namespace    MustHaveAttributes            var q   from t in Assembly GetExecutingAssembly    GetTypes                    where t IsClass  amp  amp  t Namespace     namespace                 select t          q ToList    ForEach   t   gt  Console WriteLine   t Name                 endregion Action          endregion        Console ReadLine           Console WriteLine     HIT A KEY TO EXIT            Console WriteLine     END                  eof Program     class ClassOne            eof class     class ClassTwo            eof class      System AttributeUsage   System AttributeTargets Class       System AttributeTargets Struct  AllowMultiple   true      public class AttributeClass   System Attribute          public string MustHaveDescription   get  set        public string MusHaveVersion   get  set          public AttributeClass   string mustHaveDescription  string mustHaveVersion               MustHaveDescription   mustHaveDescription        MusHaveVersion   mustHaveVersion               eof class       eof namespace

User · Answer

using System Reflection  using System Collections Generic         static List lt string gt  GetClasses string nameSpace        Assembly asm   Assembly GetExecutingAssembly         List lt string gt  namespacelist   new List lt string gt         List lt string gt  classlist   new List lt string gt          foreach  Type type in asm GetTypes                  if  type Namespace    nameSpace              namespacelist Add type Name              foreach  string classname in namespacelist          classlist Add classname        return classlist      NB  The above code illustrates what s going on   Were you to implement it  a simplified version can be used   using System Linq  using System Reflection  using System Collections Generic         static IEnumerable lt string gt  GetClasses string nameSpace        Assembly asm   Assembly GetExecutingAssembly        return asm GetTypes            Where type   gt  type Namespace    nameSpace           Select type   gt  type Name

User · Answer

Following code prints names of classes in specified namespace defined in current assembly.
As other guys pointed out, a namespace can be scattered between different modules, so you need to get a list of assemblies first.

string nspace = "...";

var q = from t in Assembly.GetExecutingAssembly().GetTypes()
        where t.IsClass && t.Namespace == nspace
        select t;
q.ToList().ForEach(t => Console.WriteLine(t.Name));

[c#] Getting all types in a namespace via reflection

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