GetConstructor Method (BindingFlags, Binder, Type[], ParameterModifier[])

Type::GetConstructor Method (BindingFlags, Binder, array<Type>, array<ParameterModifier>)

Searches for a constructor whose parameters match the specified argument types and modifiers, using the specified binding constraints.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

virtual ConstructorInfo^ GetConstructor(
	BindingFlags bindingAttr, 
	Binder^ binder, 
	array<Type^>^ types, 
	array<ParameterModifier>^ modifiers
) sealed


Type: System.Reflection::BindingFlags
A bitmask comprised of one or more BindingFlags that specify how the search is conducted.
Zero, to return nullptr.
Type: System.Reflection::Binder
An object that defines a set of properties and enables binding, which can involve selection of an overloaded method, coercion of argument types, and invocation of a member through reflection.
A null reference (Nothing in Visual Basic), to use the DefaultBinder.
Type: array<System::Type>
An array of Type objects representing the number, order, and type of the parameters for the constructor to get.
An empty array of the type Type (that is, Type[] types = new Type[0]) to get a constructor that takes no parameters.
Type: array<System.Reflection::ParameterModifier>
An array of ParameterModifier objects representing the attributes associated with the corresponding element in the parameter type array. The default binder does not process this parameter.

Return Value

Type: System.Reflection::ConstructorInfo
A ConstructorInfo object representing the constructor that matches the specified requirements, if found; otherwise, nullptr.


_Type::GetConstructor(BindingFlags, Binder, array<Type>, array<ParameterModifier>)


types is nullptr.


One of the elements in types is nullptr.


types is multidimensional.


modifiers is multidimensional.


types and modifiers do not have the same length.

If an exact match does not exist, the binder will attempt to coerce the parameter types specified in the types array in order to select a match. If the binder is unable to select a match, then nullptr is returned.

The following BindingFlags filter flags can be used to define which constructors to include in the search:

  • You must specify either BindingFlags.Instance or BindingFlags.Static in order to get a return.

  • Specify BindingFlags.Public to include public constructors in the search.

  • Specify BindingFlags.NonPublic to include non-public constructors (that is, private, internal, and protected constructors) in the search.

See System.Reflection::BindingFlags for more information.

To get the class initializer (.cctor) using this method overload, you must specify BindingFlags::Static | BindingFlags::NonPublic (BindingFlags::Static Or BindingFlags::NonPublic in Visual Basic). You can also get the class initializer using the TypeInitializer property.


You cannot omit parameters when looking up constructors and methods. You can only omit parameters when invoking.

If the current Type represents a constructed generic type, this method returns the ConstructorInfo with the type parameters replaced by the appropriate type arguments. If the current Type represents a type parameter in the definition of a generic type or generic method, this method always returns nullptr.

The following program obtains the type of MyClass1 class, gets the ConstructorInfo object matching the specified binding flags, and displays the signature of the constructor.

using namespace System;
using namespace System::Reflection;
using namespace System::Security;
public ref class MyClass1
   MyClass1( int i ){}


int main()
      Type^ myType = MyClass1::typeid;
      array<Type^>^types = gcnew array<Type^>(1);
      types[ 0 ] = int::typeid;

      // Get the constructor that is public and takes an integer parameter.
      ConstructorInfo^ constructorInfoObj = myType->GetConstructor( static_cast<BindingFlags>(BindingFlags::Instance | BindingFlags::Public), nullptr, types, nullptr );
      if ( constructorInfoObj != nullptr )
         Console::WriteLine( "The constructor of MyClass1 that is public and takes an integer as a parameter is:" );
         Console::WriteLine( constructorInfoObj );
         Console::WriteLine( "The constructor of the MyClass1 that is public and takes an integer as a parameter is not available." );
   catch ( ArgumentNullException^ e ) 
      Console::WriteLine( "ArgumentNullException: {0}", e->Message );
   catch ( ArgumentException^ e ) 
      Console::WriteLine( "ArgumentException: {0}", e->Message );
   catch ( SecurityException^ e ) 
      Console::WriteLine( "SecurityException: {0}", e->Message );
   catch ( Exception^ e ) 
      Console::WriteLine( "Exception: {0}", e->Message );

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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