dotnet-api-docs/xml/System.Reflection/ParameterInfo.xml at main · dotnet/dotnet-api-docs

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<AssemblyName>System.Reflection</AssemblyName>

</AssemblyInfo>

<AssemblyName>mscorlib</AssemblyName>

</AssemblyInfo>

<AssemblyName>netstandard</AssemblyName>

</AssemblyInfo>

<AssemblyName>System.Runtime</AssemblyName>

</AssemblyInfo>

</TypeForwardingChain>

<Base>

<BaseTypeName>System.Object</BaseTypeName>

</Base>

<InterfaceName>System.Reflection.ICustomAttributeProvider</InterfaceName>

</Interface>

<InterfaceName>System.Runtime.Serialization.IObjectReference</InterfaceName>

</Interface>

<InterfaceName>System.Runtime.InteropServices._ParameterInfo</InterfaceName>

</Interface>

</Interfaces>

<AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(0)]</AttributeName>

</Attribute>

<AttributeName Language="C#">[System.Runtime.InteropServices.ClassInterface(System.Runtime.InteropServices.ClassInterfaceType.None)]</AttributeName>

</Attribute>

<AttributeName Language="C#">[System.Serializable]</AttributeName>

</Attribute>

<AttributeName Language="C#">[System.Runtime.InteropServices.ComDefaultInterface(typeof(System.Runtime.InteropServices._ParameterInfo))]</AttributeName>

</Attribute>

<AttributeName Language="C#">[System.Runtime.InteropServices.ComVisible(true)]</AttributeName>

</Attribute>

</Attributes>

<Docs>

<summary>Discovers the attributes of a parameter and provides access to parameter metadata.</summary>

<format type="text/markdown"><![CDATA[

## Remarks

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

<xref:System.Reflection.MethodBase.GetParameters%2A> returns an array of `ParameterInfo` objects representing the parameters of a method, in order.

## Examples

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

:::code language="csharp" source="~/snippets/csharp/System.Reflection/Assembly/GetReferencedAssemblies/Reflection.cs" id="Snippet1":::

:::code language="vb" source="~/snippets/visualbasic/System.Reflection/Assembly/GetReferencedAssemblies/Reflection.vb" id="Snippet1":::

]]></format>

</remarks>

<threadsafe>This type is thread safe.</threadsafe>

</Docs>

<MemberType>Constructor</MemberType>

<AssemblyName>mscorlib</AssemblyName>

</AssemblyInfo>

<AssemblyName>netstandard</AssemblyName>

</AssemblyInfo>

<AssemblyName>System.Runtime</AssemblyName>

</AssemblyInfo>

<AssemblyName>System.Reflection</AssemblyName>

</AssemblyInfo>

<Docs>

<summary>Initializes a new instance of the <see langword="ParameterInfo" /> class.</summary>

<remarks>To be added.</remarks>

</Docs>

</Member>

<MemberType>Property</MemberType>

<AssemblyName>System.Reflection</AssemblyName>

</AssemblyInfo>

<AssemblyName>mscorlib</AssemblyName>

</AssemblyInfo>

<AssemblyName>netstandard</AssemblyName>

</AssemblyInfo>

<AssemblyName>System.Runtime</AssemblyName>

</AssemblyInfo>

<ReturnType>System.Reflection.ParameterAttributes</ReturnType>

</ReturnValue>

<Docs>

<summary>Gets the attributes for this parameter.</summary>

<value>A <see langword="ParameterAttributes" /> object representing the attributes for this parameter.</value>

<format type="text/markdown"><![CDATA[

## Remarks

This method utilizes the <xref:System.Reflection.ParameterInfo.AttrsImpl> method.

To get the <xref:System.Reflection.ParameterInfo> array, first get the method or the constructor and then call <xref:System.Reflection.MethodBase.GetParameters%2A?displayProperty=nameWithType>.

## Examples

The following example defines a method with three parameters. It uses the <xref:System.Reflection.ParameterInfo.Attributes> property to get the attributes of each parameter and display them in the console.

:::code language="csharp" source="~/snippets/csharp/System.Reflection/ParameterInfo/Attributes/parameterinfo_attributes1.cs" id="Snippet1":::

:::code language="vb" source="~/snippets/visualbasic/System.Reflection/ParameterInfo/Attributes/parameterinfo_attributes1.vb" id="Snippet1":::

]]></format>

</remarks>

</Docs>

</Member>

<MemberType>Field</MemberType>

<AssemblyName>mscorlib</AssemblyName>

</AssemblyInfo>

<AssemblyName>netstandard</AssemblyName>

</AssemblyInfo>

<AssemblyName>System.Runtime</AssemblyName>

</AssemblyInfo>

<AssemblyName>System.Reflection</AssemblyName>

</AssemblyInfo>

<ReturnType>System.Reflection.ParameterAttributes</ReturnType>

</ReturnValue>

<Docs>

<summary>The attributes of the parameter.</summary>

<format type="text/markdown"><![CDATA[

## Remarks

This field is intended only for users who are deriving classes from `ParameterInfo`.

Typical access to parameter attributes is through <xref:System.Reflection.ParameterInfo.Attributes%2A>.

]]></format>

</remarks>

</Docs>

</Member>

<MemberType>Field</MemberType>

<AssemblyName>mscorlib</AssemblyName>

</AssemblyInfo>

<AssemblyName>netstandard</AssemblyName>

</AssemblyInfo>

<AssemblyName>System.Runtime</AssemblyName>

</AssemblyInfo>

<AssemblyName>System.Reflection</AssemblyName>

</AssemblyInfo>

<AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>

</Attribute>

</Attributes>

<ReturnType>System.Type</ReturnType>

</ReturnValue>

<Docs>

<summary>The <see langword="Type" /> of the parameter.</summary>

<format type="text/markdown"><![CDATA[

## Remarks

This field is intended only for users who are deriving classes from `ParameterInfo`.

Typical access to parameter types is through <xref:System.Reflection.ParameterInfo.ParameterType%2A>.

]]></format>

</remarks>

</Docs>

</Member>

<MemberSignature Language="C#" Value="public virtual System.Collections.Generic.IEnumerable<System.Reflection.CustomAttributeData> CustomAttributes { get; }" />

<MemberSignature Language="ILAsm" Value=".property instance class System.Collections.Generic.IEnumerable`1<class System.Reflection.CustomAttributeData> CustomAttributes" />

<MemberSignature Language="F#" Value="member this.CustomAttributes : seq<System.Reflection.CustomAttributeData>" Usage="System.Reflection.ParameterInfo.CustomAttributes" />

<MemberSignature Language="C++ CLI" Value="public:
 virtual property System::Collections::Generic::IEnumerable<System::Reflection::CustomAttributeData ^> ^ CustomAttributes { System::Collections::Generic::IEnumerable<System::Reflection::CustomAttributeData ^> ^ get(); };" />

<MemberType>Property</MemberType>

<AssemblyName>System.Reflection</AssemblyName>

</AssemblyInfo>

<AssemblyName>mscorlib</AssemblyName>

</AssemblyInfo>

<AssemblyName>netstandard</AssemblyName>

</AssemblyInfo>

<AssemblyName>System.Runtime</AssemblyName>

</AssemblyInfo>

<ReturnType>System.Collections.Generic.IEnumerable<System.Reflection.CustomAttributeData></ReturnType>

</ReturnValue>

<Docs>

<summary>Gets a collection that contains this parameter's custom attributes.</summary>

<value>A collection that contains this parameter's custom attributes.</value>

<remarks>To be added.</remarks>

</Docs>

</Member>

<MemberType>Property</MemberType>

<AssemblyName>System.Reflection</AssemblyName>

</AssemblyInfo>

<AssemblyName>mscorlib</AssemblyName>

</AssemblyInfo>

<AssemblyName>netstandard</AssemblyName>

</AssemblyInfo>

<AssemblyName>System.Runtime</AssemblyName>

</AssemblyInfo>

<AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>

</Attribute>

</Attributes>

<ReturnType>System.Object</ReturnType>

</ReturnValue>

<Docs>

<summary>Gets a value indicating the default value if the parameter has a default value.</summary>

<value>The default value of the parameter, or <see cref="F:System.DBNull.Value" /> if the parameter has no default value.</value>

<format type="text/markdown"><![CDATA[

## Remarks

This property is used only in the execution context. In the reflection-only context, use the <xref:System.Reflection.ParameterInfo.RawDefaultValue> property instead.

The default value is used when an actual value is not specified in the method call. A parameter can have a default value that is `null`. This is distinct from the case where a default value is not defined.

This method utilizes the <xref:System.Reflection.ParameterInfo.DefaultValueImpl> method.

To get the <xref:System.Reflection.ParameterInfo> array, first get the method or the constructor and then call <xref:System.Reflection.MethodBase.GetParameters%2A?displayProperty=nameWithType>.

]]></format>

</remarks>

</Docs>

</Member>

<MemberType>Field</MemberType>

<AssemblyName>mscorlib</AssemblyName>

</AssemblyInfo>

<AssemblyName>netstandard</AssemblyName>

</AssemblyInfo>

<AssemblyName>System.Runtime</AssemblyName>

</AssemblyInfo>

<AssemblyName>System.Reflection</AssemblyName>

</AssemblyInfo>

<AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>

</Attribute>

</Attributes>

<ReturnType>System.Object</ReturnType>

</ReturnValue>

<Docs>

<summary>The default value of the parameter.</summary>

<format type="text/markdown"><![CDATA[

## Remarks

This field is intended only for users who are deriving classes from `ParameterInfo`.

Typical access to the default value of the parameter is through <xref:System.Reflection.ParameterInfo.DefaultValue%2A>.

]]></format>

</remarks>

</Docs>

</Member>

<AssemblyName>mscorlib</AssemblyName>

</AssemblyInfo>

<Docs>

<summary>Gets the custom attributes applied to this parameter.</summary>

</Docs>

</MemberGroup>

<MemberSignature Language="F#" Value="abstract member GetCustomAttributes : bool -> obj[]
override this.GetCustomAttributes : bool -> obj[]" Usage="parameterInfo.GetCustomAttributes inherit" />

<MemberSignature Language="C++ CLI" Value="public:
 virtual cli::array <System::Object ^> ^ GetCustomAttributes(bool inherit);" />

<MemberType>Method</MemberType>

<InterfaceMember>M:System.Reflection.ICustomAttributeProvider.GetCustomAttributes(System.Boolean)</InterfaceMember>

</Implements>

<AssemblyName>mscorlib</AssemblyName>

</AssemblyInfo>

<AssemblyName>netstandard</AssemblyName>

</AssemblyInfo>

<AssemblyName>System.Runtime</AssemblyName>

</AssemblyInfo>

<AssemblyName>System.Reflection</AssemblyName>

</AssemblyInfo>

<ReturnType>System.Object[]</ReturnType>

</ReturnValue>

</Parameters>

<Docs>

<param name="inherit">This argument is ignored for objects of this type.</param>

<summary>Gets all the custom attributes defined on this parameter.</summary>

<returns>An array that contains all the custom attributes applied to this parameter.</returns>

<format type="text/markdown"><![CDATA[

## Remarks

This method ignores the `inherit` parameter. To search the inheritance chain for attributes on parameters, use the appropriate overloads of the <xref:System.Attribute.GetCustomAttributes%2A?displayProperty=nameWithType> method.

## Examples

The following example shows how custom attributes that have been applied to the parameters of methods can be retrieved at run time. The example defines a custom attribute named `MyAttribute` that can be applied to parameters. The example then defines a class named `MyClass` with a method named `MyMethod`, and applies `MyAttribute` to a parameter of the method.

When the example is run, it uses the <xref:System.Reflection.ParameterInfo.GetCustomAttributes%28System.Boolean%29> method to retrieve the custom attributes that have been applied to all parameters of all methods in `MyClass`, and displays them at the console.

:::code language="csharp" source="~/snippets/csharp/System.Reflection/ParameterInfo/GetCustomAttributes/source.cs" id="Snippet1":::

:::code language="vb" source="~/snippets/visualbasic/System.Reflection/ParameterInfo/GetCustomAttributes/source.vb" id="Snippet1":::

]]></format>

</remarks>

<exception cref="T:System.TypeLoadException">A custom attribute type could not be loaded.</exception>

</Docs>

</Member>

<MemberSignature Language="F#" Value="abstract member GetCustomAttributes : Type * bool -> obj[]
override this.GetCustomAttributes : Type * bool -> obj[]" Usage="parameterInfo.GetCustomAttributes (attributeType, inherit)" />

<MemberSignature Language="C++ CLI" Value="public:
 virtual cli::array <System::Object ^> ^ GetCustomAttributes(Type ^ attributeType, bool inherit);" />

<MemberType>Method</MemberType>

<InterfaceMember>M:System.Reflection.ICustomAttributeProvider.GetCustomAttributes(System.Type,System.Boolean)</InterfaceMember>

</Implements>

<AssemblyName>mscorlib</AssemblyName>

</AssemblyInfo>

<AssemblyName>netstandard</AssemblyName>

</AssemblyInfo>

<AssemblyName>System.Runtime</AssemblyName>

</AssemblyInfo>

<AssemblyName>System.Reflection</AssemblyName>

</AssemblyInfo>

<ReturnType>System.Object[]</ReturnType>

</ReturnValue>

</Parameters>

<Docs>

<param name="attributeType">The custom attributes identified by type.</param>

<param name="inherit">This argument is ignored for objects of this type.</param>

<summary>Gets the custom attributes of the specified type or its derived types that are applied to this parameter.</summary>

<returns>An array that contains the custom attributes of the specified type or its derived types.</returns>

<format type="text/markdown"><![CDATA[

## Remarks

]]></format>

</remarks>

<exception cref="T:System.ArgumentException">The type must be a type provided by the underlying runtime system.</exception>

<exception cref="T:System.TypeLoadException">A custom attribute type could not be loaded.</exception>

</Docs>

</Member>

<MemberSignature Language="C#" Value="public virtual System.Collections.Generic.IList<System.Reflection.CustomAttributeData> GetCustomAttributesData ();" />

<MemberSignature Language="ILAsm" Value=".method public hidebysig newslot virtual instance class System.Collections.Generic.IList`1<class System.Reflection.CustomAttributeData> GetCustomAttributesData() cil managed" />

<MemberSignature Language="F#" Value="abstract member GetCustomAttributesData : unit -> System.Collections.Generic.IList<System.Reflection.CustomAttributeData>
override this.GetCustomAttributesData : unit -> System.Collections.Generic.IList<System.Reflection.CustomAttributeData>" Usage="parameterInfo.GetCustomAttributesData " />

<MemberSignature Language="C++ CLI" Value="public:
 virtual System::Collections::Generic::IList<System::Reflection::CustomAttributeData ^> ^ GetCustomAttributesData();" />

<MemberType>Method</MemberType>

<AssemblyName>mscorlib</AssemblyName>

</AssemblyInfo>

<AssemblyName>netstandard</AssemblyName>

</AssemblyInfo>

<AssemblyName>System.Runtime</AssemblyName>

</AssemblyInfo>

<AssemblyName>System.Reflection</AssemblyName>

</AssemblyInfo>

<ReturnType>System.Collections.Generic.IList<System.Reflection.CustomAttributeData></ReturnType>

</ReturnValue>

<Docs>

<summary>Returns a list of <see cref="T:System.Reflection.CustomAttributeData" /> objects for the current parameter, which can be used in the reflection-only context.</summary>

<returns>A generic list of <see cref="T:System.Reflection.CustomAttributeData" /> objects representing data about the attributes that have been applied to the current parameter.</returns>

<format type="text/markdown"><![CDATA[

## Remarks

Use this method to examine the custom attributes of code in the reflection-only context, in cases where the custom attributes themselves are defined in code that is loaded into the reflection-only context. Methods such as <xref:System.Attribute.GetCustomAttributes%2A?displayProperty=nameWithType> and <xref:System.Reflection.ParameterInfo.GetCustomAttributes%2A?displayProperty=nameWithType> cannot be used in such cases, because they create instances of the attributes. Code in the reflection-only context cannot be executed. For more information and example code, see the <xref:System.Reflection.CustomAttributeData> class.

]]></format>

</remarks>

</Docs>

</Member>

<MemberSignature Language="F#" Value="abstract member GetModifiedParameterType : unit -> Type
override this.GetModifiedParameterType : unit -> Type" Usage="parameterInfo.GetModifiedParameterType " />

<MemberType>Method</MemberType>

<AssemblyName>System.Runtime</AssemblyName>

</AssemblyInfo>

<AssemblyName>System.Reflection</AssemblyName>

</AssemblyInfo>

<AssemblyName>mscorlib</AssemblyName>

</AssemblyInfo>

<AssemblyName>netstandard</AssemblyName>

</AssemblyInfo>

<ReturnType>System.Type</ReturnType>

</ReturnValue>

<Docs>

<summary>Gets the modified type of this parameter object.</summary>

<returns>A modified type.</returns>

<format type="text/markdown"><![CDATA[

## Remarks

A modified type supports <xref:System.Type.GetOptionalCustomModifiers%2A>, <xref:System.Type.GetRequiredCustomModifiers%2A>, and <xref:System.Type.GetFunctionPointerCallingConventions%2A>, which are used to obtain custom modifiers from a function pointer.

To obtain the normal, unmodified type from a modified type, use <xref:System.Type.UnderlyingSystemType%2A>.

This method is provided for designers of managed compilers. For more information on custom modifiers, see classes in the <xref:System.Runtime.CompilerServices> namespace. Also see the metadata specification in Partition II of the [Common Language Infrastructure (CLI) documentation](https://www.ecma-international.org/publications-and-standards/standards/ecma-335/).

]]></format>

</remarks>

</Docs>

</Member>

<MemberSignature Language="F#" Value="abstract member GetOptionalCustomModifiers : unit -> Type[]
override this.GetOptionalCustomModifiers : unit -> Type[]" Usage="parameterInfo.GetOptionalCustomModifiers " />

<MemberSignature Language="C++ CLI" Value="public:
 virtual cli::array <Type ^> ^ GetOptionalCustomModifiers();" />

<MemberType>Method</MemberType>

<AssemblyName>System.Reflection</AssemblyName>

</AssemblyInfo>

<AssemblyName>mscorlib</AssemblyName>

</AssemblyInfo>

<AssemblyName>netstandard</AssemblyName>

</AssemblyInfo>

<AssemblyName>System.Runtime</AssemblyName>

</AssemblyInfo>

<ReturnType>System.Type[]</ReturnType>

</ReturnValue>

<Docs>

<summary>Gets the optional custom modifiers of the parameter.</summary>

<returns>An array of <see cref="T:System.Type" /> objects that identify the optional custom modifiers of the current parameter, such as <see cref="T:System.Runtime.CompilerServices.IsConst" /> or <see cref="T:System.Runtime.CompilerServices.IsImplicitlyDereferenced" />.</returns>

<format type="text/markdown"><![CDATA[

## Remarks

The <xref:System.Reflection.ParameterInfo.GetOptionalCustomModifiers%2A> and <xref:System.Reflection.ParameterInfo.GetRequiredCustomModifiers%2A> methods are provided for designers of managed compilers. For more information on custom modifiers, see <xref:System.Runtime.CompilerServices.IsBoxed> and related classes in the <xref:System.Runtime.CompilerServices> namespace, and the metadata specification in the ECMA Partition II documentation. For more information, see [ECMA 335 Common Language Infrastructure (CLI)](https://www.ecma-international.org/publications-and-standards/standards/ecma-335/).

]]></format>

</remarks>

</Docs>

</Member>

<MemberSignature Language="F#" Value="abstract member GetRealObject : System.Runtime.Serialization.StreamingContext -> obj
override this.GetRealObject : System.Runtime.Serialization.StreamingContext -> obj" Usage="parameterInfo.GetRealObject context" />

<MemberType>Method</MemberType>

<InterfaceMember>M:System.Runtime.Serialization.IObjectReference.GetRealObject(System.Runtime.Serialization.StreamingContext)</InterfaceMember>

</Implements>

<AssemblyName>mscorlib</AssemblyName>

</AssemblyInfo>

<AssemblyName>netstandard</AssemblyName>

</AssemblyInfo>

<AssemblyName>System.Runtime</AssemblyName>

</AssemblyInfo>

<AssemblyName>System.Reflection</AssemblyName>

</AssemblyInfo>

<AttributeName Language="C#">[System.ComponentModel.EditorBrowsable(System.ComponentModel.EditorBrowsableState.Never)]</AttributeName>

</Attribute>

<AttributeName Language="C#">[System.Obsolete("This API supports obsolete formatter-based serialization. It should not be called or extended by application code.", DiagnosticId="SYSLIB0051", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]</AttributeName>

</Attribute>

<AttributeName Language="C#">[System.Security.SecurityCritical]</AttributeName>

</Attribute>

</Attributes>

<ReturnType>System.Object</ReturnType>

</ReturnValue>

</Parameters>

<Docs>

<param name="context">The serialized stream from which the current object is deserialized.</param>

<summary>Returns the real object that should be deserialized instead of the object that the serialized stream specifies.</summary>

<returns>The actual object that is put into the graph.</returns>

<format type="text/markdown"><![CDATA[

## Remarks

This method implements the <xref:System.Runtime.Serialization.IObjectReference.GetRealObject%2A?displayProperty=nameWithType> method.

]]></format>

</remarks>

<exception cref="T:System.Runtime.Serialization.SerializationException">The parameter's position in the parameter list of its associated member is not valid for that member's type.</exception>

</Docs>

</Member>

<MemberSignature Language="F#" Value="abstract member GetRequiredCustomModifiers : unit -> Type[]
override this.GetRequiredCustomModifiers : unit -> Type[]" Usage="parameterInfo.GetRequiredCustomModifiers " />

<MemberSignature Language="C++ CLI" Value="public:
 virtual cli::array <Type ^> ^ GetRequiredCustomModifiers();" />

<MemberType>Method</MemberType>

<AssemblyName>System.Reflection</AssemblyName>

</AssemblyInfo>

<AssemblyName>mscorlib</AssemblyName>

</AssemblyInfo>

<AssemblyName>netstandard</AssemblyName>

</AssemblyInfo>

<AssemblyName>System.Runtime</AssemblyName>

</AssemblyInfo>

<ReturnType>System.Type[]</ReturnType>

</ReturnValue>

<Docs>

<summary>Gets the required custom modifiers of the parameter.</summary>

<returns>An array of <see cref="T:System.Type" /> objects that identify the required custom modifiers of the current parameter, such as <see cref="T:System.Runtime.CompilerServices.IsConst" /> or <see cref="T:System.Runtime.CompilerServices.IsImplicitlyDereferenced" />.</returns>

<format type="text/markdown"><![CDATA[

## Remarks

The <xref:System.Reflection.ParameterInfo.GetOptionalCustomModifiers%2A> and <xref:System.Reflection.ParameterInfo.GetRequiredCustomModifiers%2A> methods are provided for designers of managed compilers. For more information on custom modifiers, see <xref:System.Runtime.CompilerServices.IsBoxed> and related classes in the <xref:System.Runtime.CompilerServices> namespace, and the metadata specification in Partition II of [ECMA 335 Common Language Infrastructure (CLI)](https://www.ecma-international.org/publications-and-standards/standards/ecma-335/).

]]></format>

</remarks>

</Docs>

</Member>

<MemberType>Property</MemberType>

<AssemblyName>System.Reflection</AssemblyName>

</AssemblyInfo>

<AssemblyName>mscorlib</AssemblyName>

</AssemblyInfo>

<AssemblyName>netstandard</AssemblyName>

</AssemblyInfo>

<AssemblyName>System.Runtime</AssemblyName>

</AssemblyInfo>

<ReturnType>System.Boolean</ReturnType>

</ReturnValue>

<Docs>

<summary>Gets a value that indicates whether this parameter has a default value.</summary>

<value>

<see langword="true" /> if this parameter has a default value; otherwise, <see langword="false" />.</value>

<remarks>To be added.</remarks>

</Docs>

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ParameterInfo.xml

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