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ParameterInfo Class

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

System.Object
  System.Reflection.ParameterInfo

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

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

The ParameterInfo type exposes the following members.

  NameDescription
Protected methodSupported by the XNA FrameworkParameterInfoInitializes a new instance of the ParameterInfo class.
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  NameDescription
Public propertySupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsAttributesGets the attributes for this parameter.
Public propertySupported in .NET for Windows Store appsCustomAttributesGets a collection that contains this parameter's custom attributes.
Public propertySupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsDefaultValueGets a value indicating the default value if the parameter has a default value.
Public propertySupported in .NET for Windows Store appsHasDefaultValueGets a value that indicates whether this parameter has a default value.
Public propertySupported by Portable Class LibrarySupported in .NET for Windows Store appsIsInGets a value indicating whether this is an input parameter.
Public propertySupported by Portable Class LibraryIsLcidGets a value indicating whether this parameter is a locale identifier (lcid).
Public propertySupported by Portable Class LibrarySupported in .NET for Windows Store appsIsOptionalGets a value indicating whether this parameter is optional.
Public propertySupported by Portable Class LibrarySupported in .NET for Windows Store appsIsOutGets a value indicating whether this is an output parameter.
Public propertySupported by Portable Class LibrarySupported in .NET for Windows Store appsIsRetvalGets a value indicating whether this is a Retval parameter.
Public propertySupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsMemberGets a value indicating the member in which the parameter is implemented.
Public propertyMetadataTokenGets a value that identifies this parameter in metadata.
Public propertySupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsNameGets the name of the parameter.
Public propertySupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsParameterTypeGets the Type of this parameter.
Public propertySupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsPositionGets the zero-based position of the parameter in the formal parameter list.
Public propertyRawDefaultValueGets a value indicating the default value if the parameter has a default value.
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  NameDescription
Public methodSupported by the XNA FrameworkEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)

In XNA Framework, this member is overridden by Equals(Object).
Protected methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGetCustomAttributes(Boolean)Gets all the custom attributes defined on this parameter.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGetCustomAttributes(Type, Boolean)Gets the custom attributes of the specified type or its derived types that are applied to this parameter.
Public methodGetCustomAttributesDataReturns a list of CustomAttributeData objects for the current parameter, which can be used in the reflection-only context.
Public methodSupported by the XNA FrameworkGetHashCodeServes as the default hash function. (Inherited from Object.)

In XNA Framework, this member is overridden by GetHashCode().
Public methodGetOptionalCustomModifiersGets the optional custom modifiers of the parameter.
Public methodGetRealObjectReturns the real object that should be deserialized instead of the object that the serialized stream specifies.
Public methodGetRequiredCustomModifiersGets the required custom modifiers of the parameter.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryIsDefinedDetermines whether the custom attribute of the specified type or its derived types is applied to this parameter.
Protected methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodSupported by the XNA FrameworkSupported in .NET for Windows Store appsToStringGets the parameter type and name represented as a string. (Overrides Object.ToString().)

In XNA Framework 3.0, this member is inherited from Object.ToString().


In .NET for Windows Store apps Windows 8, this member is inherited from Object.ToString().
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  NameDescription
Public Extension MethodSupported in .NET for Windows Store appsGetCustomAttribute(Type)Overloaded. Retrieves a custom attribute of a specified type that is applied to a specified parameter. (Defined by CustomAttributeExtensions.)
Public Extension MethodSupported in .NET for Windows Store appsGetCustomAttribute(Type, Boolean)Overloaded. Retrieves a custom attribute of a specified type that is applied to a specified parameter, and optionally inspects the ancestors of that parameter. (Defined by CustomAttributeExtensions.)
Public Extension MethodSupported in .NET for Windows Store appsGetCustomAttribute<T>()Overloaded. Retrieves a custom attribute of a specified type that is applied to a specified parameter. (Defined by CustomAttributeExtensions.)
Public Extension MethodSupported in .NET for Windows Store appsGetCustomAttribute<T>(Boolean)Overloaded. Retrieves a custom attribute of a specified type that is applied to a specified parameter, and optionally inspects the ancestors of that parameter. (Defined by CustomAttributeExtensions.)
Public Extension MethodSupported in .NET for Windows Store appsGetCustomAttributes()Overloaded. Retrieves a collection of custom attributes that are applied to a specified parameter. (Defined by CustomAttributeExtensions.)
Public Extension MethodSupported in .NET for Windows Store appsGetCustomAttributes(Boolean)Overloaded. Retrieves a collection of custom attributes that are applied to a specified parameter, and optionally inspects the ancestors of that parameter. (Defined by CustomAttributeExtensions.)
Public Extension MethodSupported in .NET for Windows Store appsGetCustomAttributes(Type)Overloaded. Retrieves a collection of custom attributes of a specified type that are applied to a specified parameter. (Defined by CustomAttributeExtensions.)
Public Extension MethodSupported in .NET for Windows Store appsGetCustomAttributes(Type, Boolean)Overloaded. Retrieves a collection of custom attributes of a specified type that are applied to a specified parameter, and optionally inspects the ancestors of that parameter. (Defined by CustomAttributeExtensions.)
Public Extension MethodSupported in .NET for Windows Store appsGetCustomAttributes<T>()Overloaded. Retrieves a collection of custom attributes of a specified type that are applied to a specified parameter. (Defined by CustomAttributeExtensions.)
Public Extension MethodSupported in .NET for Windows Store appsGetCustomAttributes<T>(Boolean)Overloaded. Retrieves a collection of custom attributes of a specified type that are applied to a specified parameter, and optionally inspects the ancestors of that parameter. (Defined by CustomAttributeExtensions.)
Public Extension MethodSupported in .NET for Windows Store appsIsDefined(Type)Overloaded. Indicates whether custom attributes of a specified type are applied to a specified parameter. (Defined by CustomAttributeExtensions.)
Public Extension MethodSupported in .NET for Windows Store appsIsDefined(Type, Boolean)Overloaded. Indicates whether custom attributes of a specified type are applied to a specified parameter, and, optionally, applied to its ancestors. (Defined by CustomAttributeExtensions.)
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  NameDescription
Protected fieldSupported by the XNA FrameworkAttrsImplThe attributes of the parameter.
Protected fieldSupported by the XNA FrameworkClassImplThe Type of the parameter.
Protected fieldSupported by the XNA FrameworkDefaultValueImplThe default value of the parameter.
Protected fieldSupported by the XNA FrameworkMemberImplThe member in which the field is implemented.
Protected fieldSupported by the XNA FrameworkNameImplThe name of the parameter.
Protected fieldSupported by the XNA FrameworkPositionImplThe zero-based position of the parameter in the parameter list.
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  NameDescription
Explicit interface implemetationPrivate method_ParameterInfo.GetIDsOfNamesMaps a set of names to a corresponding set of dispatch identifiers.
Explicit interface implemetationPrivate method_ParameterInfo.GetTypeInfoRetrieves the type information for an object, which can then be used to get the type information for an interface.
Explicit interface implemetationPrivate method_ParameterInfo.GetTypeInfoCountRetrieves the number of type information interfaces that an object provides (either 0 or 1).
Explicit interface implemetationPrivate method_ParameterInfo.InvokeProvides access to properties and methods exposed by an object.
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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 System;
using System.Reflection;

class Module1
{
    public static void Main()
    {
        // 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 = typeof(Module1).Assembly;
        Display(indent, "Assembly identity={0}", a.FullName);
        Display(indent+1, "Codebase={0}", a.CodeBase);

        // Display the set of assemblies our assemblies reference.

        Display(indent, "Referenced assemblies:");
        foreach (AssemblyName an in a.GetReferencedAssemblies() )
        {
             Display(indent + 1, "Name={0}, Version={1}, Culture={2}, PublicKey token={3}", an.Name, an.Version, an.CultureInfo.Name, (BitConverter.ToString (an.GetPublicKeyToken())));
        }
        Display(indent, "");

        // Display information about each assembly loading into this AppDomain. 
        foreach (Assembly b in AppDomain.CurrentDomain.GetAssemblies())
        {
            Display(indent, "Assembly: {0}", b);

            // Display information about each module of this assembly. 
            foreach ( Module m in b.GetModules(true) )
            {
                Display(indent+1, "Module: {0}", m.Name);
            }

            // Display information about each type exported from this assembly.

            indent += 1;
            foreach ( Type t in b.GetExportedTypes() )
            {
                Display(0, "");
                Display(indent, "Type: {0}", t);

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

                indent += 1;
                foreach (MemberInfo mi in t.GetMembers() )
                {
                    Display(indent, "Member: {0}", mi.Name);
                    DisplayAttributes(indent, mi);

                    // If the member is a method, display information about its parameters. 

                    if (mi.MemberType==MemberTypes.Method)
                    {
                        foreach ( ParameterInfo pi in ((MethodInfo) mi).GetParameters() )
                        {
                            Display(indent+1, "Parameter: Type={0}, Name={1}", pi.ParameterType, pi.Name);
                        }
                    }

                    // If the member is a property, display information about the property's accessor methods. 
                    if (mi.MemberType==MemberTypes.Property)
                    {
                        foreach ( MethodInfo am in ((PropertyInfo) mi).GetAccessors() )
                        {
                            Display(indent+1, "Accessor method: {0}", am);
                        }
                    }
                }
                indent -= 1;
            }
            indent -= 1;
        }
    }

    // Displays the custom attributes applied to the specified member. 
    public static void DisplayAttributes(Int32 indent, MemberInfo mi)
    {
        // Get the set of custom attributes; if none exist, just return. 
        object[] attrs = mi.GetCustomAttributes(false);
        if (attrs.Length==0) {return;}

        // Display the custom attributes applied to this member.
        Display(indent+1, "Attributes:");
        foreach ( object o in attrs )
        {
            Display(indent+2, "{0}", o.ToString());
        }
    }

    // Display a formatted string indented by the specified amount. 
    public static void Display(Int32 indent, string format, params object[] param) 

    {
        Console.Write(new string(' ', indent*2));
        Console.WriteLine(format, param);
    }
}

//The output shown below is abbreviated. 
// 
//Assembly identity=ReflectionCS, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null 
//  Codebase=file:///C:/Documents and Settings/test/My Documents/Visual Studio 2005/Projects/Reflection/Reflection/obj/Debug/Reflection.exe 
//Referenced assemblies: 
//  Name=mscorlib, Version=2.0.0.0, Culture=, PublicKey token=B7-7A-5C-56-19-34-E0-89 
// 
//Assembly: mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 
//  Module: mscorlib.dll 
//  Module: mscorlib.dll 
//  Module: mscorlib.dll 
//  Module: mscorlib.dll 
//  Module: mscorlib.dll 
//  Module: mscorlib.dll 
//  Module: mscorlib.dll 
//  Module: mscorlib.dll 
//  Module: mscorlib.dll 
//  Module: mscorlib.dll 
//  Module: mscorlib.dll 
//  Module: mscorlib.dll 
//  Module: mscorlib.dll 
//  Module: mscorlib.dll 
// 
//  Type: System.Object 
//    Member: GetType 
//    Member: ToString 
//    Member: Equals 
//      Parameter: Type=System.Object, Name=obj 
//    Member: Equals 
//      Parameter: Type=System.Object, Name=objA 
//      Parameter: Type=System.Object, Name=objB 
//    Member: ReferenceEquals 
//      Attributes: 
//        System.Runtime.ConstrainedExecution.ReliabilityContractAttribute 
//      Parameter: Type=System.Object, Name=objA 
//      Parameter: Type=System.Object, Name=objB 
//    Member: GetHashCode 
//    Member: .ctor 
//      Attributes: 
//        System.Runtime.ConstrainedExecution.ReliabilityContractAttribute 
// 
//  Type: System.ICloneable 
//    Member: Clone 
// 
//  Type: System.Collections.IEnumerable 
//    Member: GetEnumerator 
//      Attributes: 
//        System.Runtime.InteropServices.DispIdAttribute 
// 
//  Type: System.Collections.ICollection 
//    Member: CopyTo 
//      Parameter: Type=System.Array, Name=array 
//      Parameter: Type=System.Int32, Name=index 
//    Member: get_Count 
//    Member: get_SyncRoot 
//    Member: get_IsSynchronized 
//    Member: Count 
//      Accessor method: Int32 get_Count() 
//    Member: SyncRoot 
//      Accessor method: System.Object get_SyncRoot() 
//    Member: IsSynchronized 
//      Accessor method: Boolean get_IsSynchronized() 
// 
//  Type: System.Collections.IList 
//    Member: get_Item 
//      Parameter: Type=System.Int32, Name=index 
//    Member: set_Item 
//      Parameter: Type=System.Int32, Name=index 
//      Parameter: Type=System.Object, Name=value 
//    Member: Add 
//      Parameter: Type=System.Object, Name=value 
//    Member: Contains 
//      Parameter: Type=System.Object, Name=value 
//    Member: Clear 
//    Member: get_IsReadOnly 
//    Member: get_IsFixedSize 
//    Member: IndexOf 
//      Parameter: Type=System.Object, Name=value 
//    Member: Insert 
//      Parameter: Type=System.Int32, Name=index 
//      Parameter: Type=System.Object, Name=value 
//    Member: Remove 
//      Parameter: Type=System.Object, Name=value 
//    Member: RemoveAt 
//      Parameter: Type=System.Int32, Name=index 
//    Member: Item 
//      Accessor method: System.Object get_Item(Int32) 
//      Accessor method: Void set_Item(Int32, System.Object) 
//    Member: IsReadOnly 
//      Accessor method: Boolean get_IsReadOnly() 
//    Member: IsFixedSize 
//      Accessor method: Boolean get_IsFixedSize() 
// 
//  Type: System.Array 
//    Member: IndexOf 
//      Parameter: Type=T[], Name=array 
//      Parameter: Type=T, Name=value 
//    Member: AsReadOnly 
//      Parameter: Type=T[], Name=array 
//    Member: Resize 
//      Attributes: 
//        System.Runtime.ConstrainedExecution.ReliabilityContractAttribute 
//      Parameter: Type=T[]&, Name=array 
//      Parameter: Type=System.Int32, Name=newSize 
//    Member: BinarySearch 
//      Attributes: 
//        System.Runtime.ConstrainedExecution.ReliabilityContractAttribute 
//      Parameter: Type=T[], Name=array 
//      Parameter: Type=T, Name=value 
//    Member: BinarySearch 
//      Attributes: 
//        System.Runtime.ConstrainedExecution.ReliabilityContractAttribute 
//      Parameter: Type=T[], Name=array 
//      Parameter: Type=T, Name=value 
//      Parameter: Type=System.Collections.Generic.IComparer`1[T], Name=comparer

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

This type is thread safe.

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