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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)

'Declaration
<SerializableAttribute> _
<ComVisibleAttribute(True)> _
<ClassInterfaceAttribute(ClassInterfaceType.None)> _
Public Class ParameterInfo _
	Implements _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 FrameworkAttributesGets the attributes for this parameter.
Public propertySupported by the XNA FrameworkSupported by Portable Class LibraryDefaultValueGets a value indicating the default value if the parameter has a default value.
Public propertyIsInGets a value indicating whether this is an input parameter.
Public propertyIsLcidGets a value indicating whether this parameter is a locale identifier (lcid).
Public propertyIsOptionalGets a value indicating whether this parameter is optional.
Public propertyIsOutGets a value indicating whether this is an output parameter.
Public propertyIsRetvalGets a value indicating whether this is a Retval parameter.
Public propertySupported by the XNA FrameworkSupported by Portable Class LibraryMemberGets 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 LibraryNameGets the name of the parameter.
Public propertySupported by the XNA FrameworkSupported by Portable Class LibraryParameterTypeGets the Type of this parameter.
Public propertySupported by the XNA FrameworkSupported by Portable Class LibraryPositionGets 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 LibraryFinalizeAllows 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 a hash function for a particular type. (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 LibraryGetTypeGets 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 LibraryMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryToStringGets 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 Portable Class Library Portable Class Library, this member is inherited from Object.ToString.
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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.


Imports System
Imports System.Reflection

Module Module1

    Sub Main()
        ' This variable holds the amount of indenting that 
        ' should be used when displaying each line of information.
        Dim indent As Int32 = 0
        ' Display information about the EXE assembly.
        Dim a As [Assembly] = System.Reflection.Assembly.GetExecutingAssembly()
        Display(indent, "Assembly identity={0}", a.FullName)
        Display(indent + 1, "Codebase={0}", a.CodeBase)

        ' Display the set of assemblies our assemblies reference.
        Dim an As AssemblyName
        Display(indent, "Referenced assemblies:")
        For Each 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))
        Next
        Display(indent, "")

        ' Display information about each assembly loading into this AppDomain.
        For Each a In AppDomain.CurrentDomain.GetAssemblies()
            Display(indent, "Assembly: {0}", a)

            ' Display information about each module of this assembly.
            Dim m As [Module]
            For Each m In a.GetModules(True)
                Display(indent + 1, "Module: {0}", m.Name)
            Next

            ' Display information about each type exported from this assembly.
            Dim t As Type
            indent += 1
            For Each t In a.GetExportedTypes()
                Display(0, "")
                Display(indent, "Type: {0}", t)

                ' For each type, show its members & their custom attributes.
                Dim mi As MemberInfo
                indent += 1
                For Each mi In t.GetMembers()
                    Display(indent, "Member: {0}", mi.Name)
                    DisplayAttributes(indent, mi)

                    ' If the member is a method, display information about its parameters.
                    Dim pi As ParameterInfo
                    If mi.MemberType = MemberTypes.Method Then
                        For Each pi In CType(mi, MethodInfo).GetParameters()
                            Display(indent + 1, "Parameter: Type={0}, Name={1}", pi.ParameterType, pi.Name)
                        Next
                    End If

                    ' If the member is a property, display information about the property's accessor methods.
                    If mi.MemberType = MemberTypes.Property Then
                        Dim am As MethodInfo
                        For Each am In CType(mi, PropertyInfo).GetAccessors()
                            Display(indent + 1, "Accessor method: {0}", am)
                        Next
                    End If
                Next
                indent -= 1
            Next
            indent -= 1
        Next
    End Sub

    ' Displays the custom attributes applied to the specified member.
    Sub DisplayAttributes(ByVal indent As Int32, ByVal mi As MemberInfo)
        ' Get the set of custom attributes; if none exist, just return.
        Dim attrs() As Object = mi.GetCustomAttributes(False)
        If attrs.Length = 0 Then Return

        ' Display the custom attributes applied to this member.
        Display(indent + 1, "Attributes:")
        Dim o As Object
        For Each o In attrs
            Display(indent + 2, "{0}", o.ToString())
        Next
    End Sub

    ' Display a formatted string indented by the specified amount.
    Sub Display(ByVal indent As Int32, ByVal format As String, ByVal ParamArray params() As Object)
        Console.Write(New String(" "c, indent * 2))
        Console.WriteLine(format, params)
    End Sub
End Module

'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()
'


.NET Framework

Supported in: 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

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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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