Type.GetConstructorImpl Method (System)

.NET Framework Class Library

Type..::.GetConstructorImpl Method

When overridden in a derived class, searches for a constructor whose parameters match the specified argument types and modifiers, using the specified binding constraints and the specified calling convention.

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

Syntax

Protected MustOverride Function GetConstructorImpl ( _
	bindingAttr As BindingFlags, _
	binder As Binder, _
	callConvention As CallingConventions, _
	types As Type(), _
	modifiers As ParameterModifier() _
) As ConstructorInfo

protected abstract ConstructorInfo GetConstructorImpl(
	BindingFlags bindingAttr,
	Binder binder,
	CallingConventions callConvention,
	Type[] types,
	ParameterModifier[] modifiers
)

protected:
virtual ConstructorInfo^ GetConstructorImpl(
	BindingFlags bindingAttr, 
	Binder^ binder, 
	CallingConventions callConvention, 
	array<Type^>^ types, 
	array<ParameterModifier>^ modifiers
) abstract

abstract GetConstructorImpl : 
        bindingAttr:BindingFlags * 
        binder:Binder * 
        callConvention:CallingConventions * 
        types:Type[] * 
        modifiers:ParameterModifier[] -> ConstructorInfo

Parameters

bindingAttr: Type: System.Reflection..::.BindingFlags
A bitmask comprised of one or more BindingFlags that specify how the search is conducted.
-or-
Zero, to return nullNothingnullptra null reference (Nothing in Visual Basic).

binder: 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.
-or-
A null reference (Nothing in Visual Basic), to use the DefaultBinder.

callConvention: Type: System.Reflection..::.CallingConventions
The object that specifies the set of rules to use regarding the order and layout of arguments, how the return value is passed, what registers are used for arguments, and the stack is cleaned up.

types: Type: array<System..::.Type>[]()[]
An array of Type objects representing the number, order, and type of the parameters for the constructor to get.
-or-
An empty array of the type Type (that is, Type[] types = new Type[0]) to get a constructor that takes no parameters.

modifiers: Type: array<System.Reflection..::.ParameterModifier>[]()[]
An array of ParameterModifier objects representing the attributes associated with the corresponding element in the types 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, nullNothingnullptra null reference (Nothing in Visual Basic).

Exceptions

Exception	Condition
ArgumentNullException	types is nullNothingnullptra null reference (Nothing in Visual Basic). -or- One of the elements in types is nullNothingnullptra null reference (Nothing in Visual Basic).
ArgumentException	types is multidimensional. -or- modifiers is multidimensional. -or- types and modifiers do not have the same length.
NotSupportedException	The current type is a TypeBuilder or GenericTypeParameterBuilder.

Exception

Condition

ArgumentNullException

types is nullNothingnullptra null reference (Nothing in Visual Basic).

-or-

One of the elements in types is nullNothingnullptra null reference (Nothing in Visual Basic).

ArgumentException

types is multidimensional.

-or-

modifiers is multidimensional.

-or-

types and modifiers do not have the same length.

NotSupportedException

The current type is a TypeBuilder or GenericTypeParameterBuilder.

Remarks

Although the default binder does not process ParameterModifier (the modifiers parameter), you can use the abstract System.Reflection..::.Binder class to write a custom binder that does process modifiers. ParameterModifier is only used when calling through COM interop, and only parameters that are passed by reference are handled.

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 nullNothingnullptra null reference (Nothing in Visual Basic) 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.

This method implements GetConstructor.

Version Information

.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

Platforms

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.

Reference