Type.GetConstructor Method

Gets a specific constructor of the current Type.

Overload List

Searches for a public instance constructor whose parameters match the types in the specified array.

Supported by the .NET Compact Framework.

[Visual Basic] Overloads Public Function GetConstructor(Type()) As ConstructorInfo

[C#] public ConstructorInfo GetConstructor(Type[]);

[C++] public: ConstructorInfo* GetConstructor(Type*[]);

[JScript] public function GetConstructor(Type[]) : ConstructorInfo;

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

Supported by the .NET Compact Framework.

[Visual Basic] Overloads Public Function GetConstructor(BindingFlags, Binder, Type(), ParameterModifier()) As ConstructorInfo

[C#] public ConstructorInfo GetConstructor(BindingFlags, Binder, Type[], ParameterModifier[]);

[C++] public: ConstructorInfo* GetConstructor(BindingFlags, Binder*, Type[], ParameterModifier[]);

[JScript] public function GetConstructor(BindingFlags, Binder, Type[], ParameterModifier[]) : ConstructorInfo;

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] Overloads Public Function GetConstructor(BindingFlags, Binder, CallingConventions, Type(), ParameterModifier()) As ConstructorInfo

[C#] public ConstructorInfo GetConstructor(BindingFlags, Binder, CallingConventions, Type[], ParameterModifier[]);

[C++] public: ConstructorInfo* GetConstructor(BindingFlags, Binder*, CallingConventions, Type[], ParameterModifier[]);

[JScript] public function GetConstructor(BindingFlags, Binder, CallingConventions, Type[], ParameterModifier[]) : ConstructorInfo;

Example

[Visual Basic, C#, C++] The following example obtains the type of MyClass1, gets the ConstructorInfo object that matches the specified binding flags, and displays the constructor signature.

[Visual Basic, C#, C++] Note   This example shows how to use one of the overloaded versions of GetConstructor. For other examples that might be available, see the individual overload topics.

[Visual Basic] 
Public Class MyClass1
    Public Sub New(ByVal i As Integer)
    End Sub
    Public Shared Sub Main()
        Try
            Dim myType As Type = GetType(MyClass1)
            Dim types(0) As Type
            types(0) = GetType(Integer)
            ' Get the public instance constructor that takes an integer parameter.
            Dim constructorInfoObj As ConstructorInfo = _
                        myType.GetConstructor(BindingFlags.Instance Or _
                        BindingFlags.Public, Nothing, _
                        CallingConventions.HasThis, types, Nothing)
            If Not (constructorInfoObj Is Nothing) Then
                Console.WriteLine("The constructor of MyClass1 that " + _
                                  "is a public instance method and takes an " + _
                                  "integer as a parameter is: ")
                Console.WriteLine(constructorInfoObj.ToString())
            Else
                Console.WriteLine("The constructor MyClass1 that " + _
                                  "is a public instance method and takes an " + _
                                  "integer as a parameter is not available.")
            End If
        Catch e As ArgumentNullException
            Console.WriteLine("ArgumentNullException: " + e.Message)
        Catch e As ArgumentException
            Console.WriteLine("ArgumentException: " + e.Message)
        Catch e As SecurityException
            Console.WriteLine("SecurityException: " + e.Message)
        Catch e As Exception
            Console.WriteLine("Exception: " + e.Message)
        End Try
    End Sub
End Class

[C#] 
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 public instance constructor that takes an integer parameter.
            ConstructorInfo constructorInfoObj = myType.GetConstructor(
                BindingFlags.Instance | BindingFlags.Public, null,
                CallingConventions.HasThis, types, null);
            if(constructorInfoObj != null)
            {
                Console.WriteLine("The constructor of MyClass1 that is a public " +
                    "instance method and takes an integer as a parameter is: ");
                Console.WriteLine(constructorInfoObj.ToString());
            }
            else
            {
                Console.WriteLine("The constructor of MyClass1 that is a public instance " +
                    "method 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);
        }
    }
}

[C++] 
#using <mscorlib.dll>

using namespace System;
using namespace System::Reflection;
using namespace System::Security;

public __gc class MyClass1 {
public:
   MyClass1(int i) {}
}
;
int main() {
   try {
      Type*  myType = __typeof(MyClass1);
      Type* types[] = new Type*[1];
      types->Item[0] = __typeof(int);
      // Get the public instance constructor that takes an integer parameter.
      ConstructorInfo*  constructorInfoObj = myType->GetConstructor(static_cast<BindingFlags>(BindingFlags::Instance | BindingFlags::Public), 0,
         CallingConventions::HasThis, types, 0);
      if (constructorInfoObj != 0) {
         Console::WriteLine(S"The constructor of MyClass1 that is a public instance method and takes an integer as a parameter is: ");
         Console::WriteLine(constructorInfoObj);
      } else {
         Console::WriteLine(S"The constructor of MyClass1 that is a public instance method and takes an integer as a parameter is not available.");
      }
   } catch (ArgumentNullException* e) {
      Console::WriteLine(S"ArgumentNullException: {0}", e->Message);
   } catch (ArgumentException* e) {
      Console::WriteLine(S"ArgumentException: {0}", e->Message);
   } catch (SecurityException* e) {
      Console::WriteLine(S"SecurityException: {0}", e->Message);
   } catch (Exception* e) {
      Console::WriteLine(S"Exception: {0}", e->Message);
   }
}

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button in the upper-left corner of the page.

See Also

Type Class | Type Members | System Namespace