Udostępnij za pośrednictwem

  • Artykuł

ElementInit Class

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Represents an initializer for a single element of an IEnumerable collection.

Inheritance Hierarchy

System.Object
  System.Linq.Expressions.ElementInit

Namespace:  System.Linq.Expressions
Assembly:  System.Core (in System.Core.dll)

Syntax

'Declaration
Public NotInheritable Class ElementInit

public sealed class ElementInit

The ElementInit type exposes the following members.

Properties

  Name Description
Public propertySupported by Silverlight for Windows Phone AddMethod Gets the instance method that is used to add an element to an IEnumerable collection.
Public propertySupported by Silverlight for Windows Phone Arguments Gets the collection of arguments that are passed to a method that adds an element to an IEnumerable collection.

Top

Methods

  Name Description
Public methodSupported by Silverlight for Windows Phone Equals(Object) Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodSupported by Silverlight for Windows Phone Finalize Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
Public methodSupported by Silverlight for Windows Phone GetHashCode Serves as a hash function for a particular type. (Inherited from Object.)
Public methodSupported by Silverlight for Windows Phone GetType Gets the Type of the current instance. (Inherited from Object.)
Protected methodSupported by Silverlight for Windows Phone MemberwiseClone Creates a shallow copy of the current Object. (Inherited from Object.)
Public methodSupported by Silverlight for Windows Phone ToString Returns a textual representation of an ElementInit object. (Overrides Object.ToString().)
Public method Update Creates a new expression that is like this one, but using the supplied children. If all of the children are the same, it will return this expression.

Top

Examples

The following example creates an ElementInit that represents the initialization of an element of a dictionary collection.

Dim tree As String = "maple"

Dim addMethod As System.Reflection.MethodInfo = _
    Type.GetType("System.Collections.Generic.Dictionary`2[System.Int32, System.String]").GetMethod("Add")

' Create an ElementInit that represents calling
' Dictionary(Of Integer, String).Add(tree.Length, tree).
Dim elementInit As System.Linq.Expressions.ElementInit = _
    System.Linq.Expressions.Expression.ElementInit( _
        addMethod, _
        System.Linq.Expressions.Expression.Constant(tree.Length), _
        System.Linq.Expressions.Expression.Constant(tree))

outputBlock.Text &= elementInit.ToString() & vbCrLf

' This code produces the following output:
'
' Void Add(Int32, System.String)(5,"maple")

string tree = "maple";

System.Reflection.MethodInfo addMethod = typeof(Dictionary<int, string>).GetMethod("Add");

// Create an ElementInit that represents calling
// Dictionary<int, string>.Add(tree.Length, tree).
System.Linq.Expressions.ElementInit elementInit =
    System.Linq.Expressions.Expression.ElementInit(
        addMethod,
        System.Linq.Expressions.Expression.Constant(tree.Length),
        System.Linq.Expressions.Expression.Constant(tree));

outputBlock.Text += elementInit.ToString() + "\n";

// This code produces the following output:
//
// Void Add(Int32, System.String)(5,"maple")

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.