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ParameterInfo Class

Discovers the attributes of a parameter and provides access to parameter metadata.

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

[SerializableAttribute]
[ClassInterfaceAttribute(ClassInterfaceType::None)]
[ComVisibleAttribute(true)]
public ref class ParameterInfo : _ParameterInfo, 
	ICustomAttributeProvider

Use an instance of ParameterInfo to obtain information about the parameter's data type, default value, and so on.

GetParameters returns an array of ParameterInfo objects representing the parameters of a method, in order.

This example shows how to use various reflection classes to analyze the metadata contained in an assembly.

using namespace System;
using namespace System::Reflection;

static void Display(Int32 indent, String^ format, ... array<Object^>^param) 
{
    Console::Write("{0}", gcnew String (' ', indent));
    Console::WriteLine(format, param);
}
	
// Displays the custom attributes applied to the specified member. 
static void DisplayAttributes(Int32 indent, MemberInfo^ mi)
{
    // Get the set of custom attributes; if none exist, just return. 
    array<Object^>^attrs = mi->GetCustomAttributes(false);
		
    if (attrs->Length==0)
    {
        return;          
    }
		
    // Display the custom attributes applied to this member.
    Display(indent+1, "Attributes:");
    for each ( Object^ o in attrs )
    {
        Display(indent*2, "{0}", o);
    }				
}

void main()
{
    try
    {
        // This variable holds the amount of indenting that  
        // should be used when displaying each line of information.
        Int32 indent = 0; 
        // Display information about the EXE assembly.
        Assembly^ a = System::Reflection::Assembly::GetExecutingAssembly();
		
        Display(indent, "Assembly identity={0}", gcnew array<Object^> {a->FullName});
        Display(indent+1, "Codebase={0}", gcnew array<Object^> {a->CodeBase});

        // Display the set of assemblies our assemblies reference.

        Display(indent, "Referenced assemblies:"); 

        for each ( AssemblyName^ an in a->GetReferencedAssemblies() )
        {
            Display(indent + 1, "Name={0}, Version={1}, Culture={2}, PublicKey token={3}", gcnew array<Object^> {an->Name, an->Version, an->CultureInfo, (BitConverter::ToString(an->GetPublicKeyToken()))});
        }
        Display(indent, "");  
        // Display information about each assembly loading into this AppDomain.  
        for each ( Assembly^ b in AppDomain::CurrentDomain->GetAssemblies()) 
        {
            Display(indent, "Assembly: {0}", gcnew array<Object^> {b});
            // Display information about each module of this assembly. 

            for each ( Module^ m in b->GetModules(true) ) 
            {
                Display(indent+1, "Module: {0}", gcnew array<Object^> {m->Name});
            }
            // Display information about each type exported from this assembly.

            indent += 1; 
            for each ( Type^ t in b->GetExportedTypes() ) 
            {
                Display(0, "");  
                Display(indent, "Type: {0}", gcnew array<Object^> {t}); 

                // For each type, show its members & their custom attributes.

                indent += 1; 
                for each (MemberInfo^ mi in t->GetMembers() )
                {
                    Display(indent, "Member: {0}", gcnew array<Object^> {mi->Name}); 
                    DisplayAttributes(indent, mi);

                    // If the member is a method, display information about its parameters.          
                    if (mi->MemberType==MemberTypes::Method) 
                    {
					
                        for each ( ParameterInfo^ pi in (((MethodInfo^) mi)->GetParameters()))
                        {
                            Display(indent+1, "Parameter: Type={0}, Name={1}", gcnew array<Object^> {pi->ParameterType, pi->Name}); 
                        }
                    }

                    // If the member is a property, display information about the property's accessor methods. 
                    if (mi->MemberType==MemberTypes::Property) 
                    {
                        for each ( MethodInfo^ am in (((PropertyInfo^) mi)->GetAccessors()) )
                        {
                            Display(indent+1, "Accessor method: {0}", gcnew array<Object^> {am});
                        }
                    }
                }
                // Display a formatted string indented by the specified amount.               
                indent -= 1;
            }
            indent -= 1;
        }
    }
    catch (Exception^ e)
    {
        Console::WriteLine(e->Message);
    }
}

// The output shown below is abbreviated. 
// 
//Assembly identity=Reflection, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null 
//  Codebase=file:///C:/Reflection.exe 
//Referenced assemblies: 
//  Name=mscorlib, Version=1.0.5000.0, Culture=, PublicKey token=B7-7A-5C-56-19-34-E0-89 
//  Name=Microsoft.VisualBasic, Version=7.0.5000.0, Culture=, PublicKey token=B0-3F-5F-7F-11-D5-0A-3A 
// 
//Assembly: mscorlib, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 
//  Module: mscorlib.dll 
//  Module: prc.nlp 
//  Module: prcp.nlp 
//  Module: ksc.nlp 
//  Module: ctype.nlp 
//  Module: xjis.nlp 
//  Module: bopomofo.nlp 
//  Module: culture.nlp 
//  Module: region.nlp 
//  Module: sortkey.nlp 
//  Module: charinfo.nlp 
//  Module: big5.nlp 
//  Module: sorttbls.nlp 
//  Module: l_intl.nlp 
//  Module: l_except.nlp 
// 
//  Type: System.Object 
//    Member: GetHashCode 
//    Member: Equals 
//      Parameter: Type=System.Object, Name=obj 
//    Member: ToString 
//    Member: Equals 
//      Parameter: Type=System.Object, Name=objA 
//      Parameter: Type=System.Object, Name=objB 
//    Member: ReferenceEquals 
//      Parameter: Type=System.Object, Name=objA 
//      Parameter: Type=System.Object, Name=objB 
//    Member: GetType 
//    Member: .ctor 
// 
//  Type: System.ICloneable 
//    Member: Clone 
// 
//  Type: System.Collections.IEnumerable 
//    Member: GetEnumerator 
//      Attributes: 
//        System.Runtime.InteropServices.DispIdAttribute 
// 
//  Type: System.Collections.ICollection 
//    Member: get_IsSynchronized 
//    Member: get_SyncRoot 
//    Member: get_Count 
//    Member: CopyTo 
//      Parameter: Type=System.Array, Name=array 
//      Parameter: Type=System.Int32, Name=index 
//    Member: Count 
//      Accessor method: Int32 get_Count() 
//    Member: SyncRoot 
//      Accessor method: System.Object get_SyncRoot() 
//    Member: IsSynchronized 
//      Accessor method: Boolean get_IsSynchronized() 
//

System::Object
  System.Reflection::ParameterInfo

This type is thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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

.NET Framework

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

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

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