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

[ComVisibleAttribute(true)] 
public ConstructorInfo GetConstructor (
	BindingFlags bindingAttr,
	Binder binder,
	Type[] types,
	ParameterModifier[] modifiers
)
/** @attribute ComVisibleAttribute(true) */ 
public final ConstructorInfo GetConstructor (
	BindingFlags bindingAttr, 
	Binder binder, 
	Type[] types, 
	ParameterModifier[] modifiers
)
ComVisibleAttribute(true) 
public final function GetConstructor (
	bindingAttr : BindingFlags, 
	binder : Binder, 
	types : Type[], 
	modifiers : ParameterModifier[]
) : ConstructorInfo
Not applicable.

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.

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.

-or-

EmptyTypes.

modifiers

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

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

Exception typeCondition

ArgumentNullException

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

-or-

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

ArgumentException

types is multidimensional.

-or-

modifiers is multidimensional.

-or-

types and modifiers do not have the same length.

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 enhance 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.

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

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.

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

NoteNote:

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 a null reference (Nothing in Visual Basic).

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 System;
using System.Reflection;
using System.Security;


public class MyClass1
{
    public MyClass1(int i){}
    public static void Main()
    {
        try
        {
            Type myType = typeof(MyClass1);
            Type[] types = new Type[1];
            types[0] = typeof(int);
            // Get the constructor that is public and takes an integer parameter.
            ConstructorInfo constructorInfoObj = myType.GetConstructor(
                BindingFlags.Instance | BindingFlags.Public, null, types, null);
            if (constructorInfoObj != null )
            {
                Console.WriteLine("The constructor of MyClass1 that is public " +
                    "and takes an integer as a parameter is:");
                Console.WriteLine(constructorInfoObj.ToString());
            }
            else
            {
                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: " + e.Message);
        }
        catch(ArgumentException e)
        {
            Console.WriteLine("ArgumentException: " + e.Message);
        }
        catch(SecurityException e)
        {
            Console.WriteLine("SecurityException: " + e.Message);
        }
        catch(Exception e)
        {
            Console.WriteLine("Exception: " + e.Message);
        }
    }
}

import System.*;
import System.Reflection.*;
import System.Security.*;

public class MyClass1
{
    public MyClass1(int i)
    {
    } //MyClass1

    public static void main(String[] args)
    {
        try {
            Type myType = MyClass1.class.ToType();
            Type types[] = new Type[1];
            types.set_Item(0, int.class.ToType());
            // Get the constructor that is public and takes an integer parameter.
            ConstructorInfo constructorInfoObj =
                myType.GetConstructor(BindingFlags.Instance
                | BindingFlags.Public,null, types, null);
            if (constructorInfoObj != null) {
                Console.WriteLine("The constructor of MyClass1 that is public "
                    + "and takes an integer as a parameter is:");
                Console.WriteLine(constructorInfoObj.ToString());
            }
            else {
                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: " + e.get_Message());
        }
        catch (ArgumentException e) {
            Console.WriteLine("ArgumentException: " + e.get_Message());
        }
        catch (SecurityException e) {
            Console.WriteLine("SecurityException: " + e.get_Message());
        }
        catch (System.Exception e) {
            Console.WriteLine("Exception: " + e.get_Message());
        }
    } //main
} //MyClass1

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0
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