ParameterInfo Class
Discovers the attributes of a parameter and provides access to parameter metadata.
Assembly: mscorlib (in mscorlib.dll)
The ParameterInfo type exposes the following members.
| Name | Description | |
|---|---|---|
![]() ![]() | Attributes | Gets the attributes for this parameter. |
![]() ![]() ![]() | DefaultValue | Gets a value indicating the default value if the parameter has a default value. |
![]() | IsIn | Gets a value indicating whether this is an input parameter. |
![]() | IsLcid | Gets a value indicating whether this parameter is a locale identifier (lcid). |
![]() | IsOptional | Gets a value indicating whether this parameter is optional. |
![]() | IsOut | Gets a value indicating whether this is an output parameter. |
![]() | IsRetval | Gets a value indicating whether this is a Retval parameter. |
![]() ![]() ![]() | Member | Gets a value indicating the member in which the parameter is implemented. |
![]() | MetadataToken | Gets a value that identifies this parameter in metadata. |
![]() ![]() ![]() | Name | Gets the name of the parameter. |
![]() ![]() ![]() | ParameterType | Gets the Type of this parameter. |
![]() ![]() ![]() | Position | Gets the zero-based position of the parameter in the formal parameter list. |
![]() | RawDefaultValue | Gets a value indicating the default value if the parameter has a default value. |
| Name | Description | |
|---|---|---|
![]() ![]() | Equals(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). |
![]() ![]() ![]() | Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
![]() ![]() ![]() | GetCustomAttributes(Boolean) | Gets all the custom attributes defined on this parameter. |
![]() ![]() ![]() | GetCustomAttributes(Type, Boolean) | Gets the custom attributes of the specified type or its derived types that are applied to this parameter. |
![]() | GetCustomAttributesData | Returns a list of CustomAttributeData objects for the current parameter, which can be used in the reflection-only context. |
![]() ![]() | GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) In XNA Framework, this member is overridden by GetHashCode. |
![]() | GetOptionalCustomModifiers | Gets the optional custom modifiers of the parameter. |
![]() | GetRealObject | Returns the real object that should be deserialized instead of the object that the serialized stream specifies. |
![]() | GetRequiredCustomModifiers | Gets the required custom modifiers of the parameter. |
![]() ![]() ![]() | GetType | Gets the Type of the current instance. (Inherited from Object.) |
![]() ![]() ![]() | IsDefined | Determines whether the custom attribute of the specified type or its derived types is applied to this parameter. |
![]() ![]() ![]() | MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
![]() ![]() ![]() | ToString | Gets 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. |
| Name | Description | |
|---|---|---|
![]() ![]() | AttrsImpl | The attributes of the parameter. |
![]() ![]() | ClassImpl | The Type of the parameter. |
![]() ![]() | DefaultValueImpl | The default value of the parameter. |
![]() ![]() | MemberImpl | The member in which the field is implemented. |
![]() ![]() | NameImpl | The name of the parameter. |
![]() ![]() | PositionImpl | The zero-based position of the parameter in the parameter list. |
| Name | Description | |
|---|---|---|
![]() ![]() | _ParameterInfo.GetIDsOfNames | Maps a set of names to a corresponding set of dispatch identifiers. |
![]() ![]() | _ParameterInfo.GetTypeInfo | Retrieves the type information for an object, which can then be used to get the type information for an interface. |
![]() ![]() | _ParameterInfo.GetTypeInfoCount | Retrieves the number of type information interfaces that an object provides (either 0 or 1). |
![]() ![]() | _ParameterInfo.Invoke | Provides access to properties and methods exposed by an object. |
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() '
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.







