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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.

[Visual Basic]
Protected MustOverride Function GetConstructorImpl( _
   ByVal bindingAttr As BindingFlags, _
   ByVal binder As Binder, _
   ByVal callConvention As CallingConventions, _
   ByVal types() As Type, _
   ByVal modifiers() As ParameterModifier _
) As ConstructorInfo
[C#]
protected abstract ConstructorInfo GetConstructorImpl(
 BindingFlags bindingAttr,
 Binder binder,
 CallingConventions callConvention,
 Type[] types,
 ParameterModifier[] modifiers
);
[C++]
protected: virtual ConstructorInfo* GetConstructorImpl(
 BindingFlags bindingAttr,
 Binder* binder,
 CallingConventions callConvention,
 Type* types[],
 ParameterModifier modifiers[]
) = 0;
[JScript]
protected abstract function GetConstructorImpl(
   bindingAttr : BindingFlags,
 binder : Binder,
 callConvention : CallingConventions,
 types : Type[],
 modifiers : ParameterModifier[]
) : ConstructorInfo;

Parameters

bindingAttr
A bitmask comprised of one or more BindingFlags that specify how the search is conducted.

-or-

Zero, to return a null reference (Nothing in Visual Basic).

binder
A Binder 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
The CallingConventions 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
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
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

A ConstructorInfo object representing the constructor that matches the specified requirements, if found; otherwise, a null reference (Nothing in Visual Basic).

Exceptions

Exception Type Condition
ArgumentNullException types is a null reference (Nothing in Visual Basic).

-or-

One of the elements in types is a null reference (Nothing).

ArgumentException types is multidimensional.

-or-

modifiers is multidimensional.

-or-

types and modifiers do not have the same length.

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.

The types array and the modifiers array have the same length. A parameter specified in the types array can have the following attributes, which are specified in the modifiers array: pdIn, pdOut, pdLcid, pdRetval, pdOptional, and pdHasDefault, which represent [In], [Out], [lcid], [retval], [optional], and a value specifying whether the parameter has a default value. A parameter's associated attributes are stored in the metadata and are used for interoperability.

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 a 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 and protected constructors) in the search.

See System.Reflection.BindingFlags for more information.

This method implements GetConstructor.

If the requested type is non-public and the caller does not have ReflectionPermission to reflect non-public objects outside the current assembly, this method returns a null reference (Nothing).

GetConstructor and GetConstructorImpl cannot be used to obtain a class initializer. Class initializers are available only through GetMember, GetMembers, FindMembers, and GetConstructors.

Requirements

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, .NET Compact Framework

.NET Framework Security: 

See Also

Type Class | Type Members | System Namespace | ConstructorInfo | BindingFlags | Binder | DefaultBinder | CallingConventions | ParameterModifier | ReflectionPermission | GetConstructor | GetConstructors

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