NewExpression Class
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Represents a constructor call.
public ref class NewExpression : System::Linq::Expressions::Expression, System::Linq::Expressions::IArgumentProvider
public ref class NewExpression sealed : System::Linq::Expressions::Expression
public ref class NewExpression : System::Linq::Expressions::Expression
public class NewExpression : System.Linq.Expressions.Expression, System.Linq.Expressions.IArgumentProvider
public sealed class NewExpression : System.Linq.Expressions.Expression
public class NewExpression : System.Linq.Expressions.Expression
type NewExpression = class
inherit Expression
interface IArgumentProvider
type NewExpression = class
inherit Expression
Public Class NewExpression
Inherits Expression
Implements IArgumentProvider
Public NotInheritable Class NewExpression
Inherits Expression
Public Class NewExpression
Inherits Expression
- Inheritance
- Implements
The following example creates a NewExpression that represents the construction of a new instance of a dictionary object.
// Create a NewExpression that represents constructing
// a new instance of Dictionary<int, string>.
System.Linq.Expressions.NewExpression newDictionaryExpression =
System.Linq.Expressions.Expression.New(typeof(Dictionary<int, string>));
Console.WriteLine(newDictionaryExpression.ToString());
// This code produces the following output:
//
// new Dictionary`2()
' Create a NewExpression that represents constructing
' a new instance of Dictionary(Of Integer, String).
Dim newDictionaryExpression As System.Linq.Expressions.NewExpression = _
System.Linq.Expressions.Expression.[New]( _
Type.GetType("System.Collections.Generic.Dictionary`2[System.Int32, System.String]"))
Console.WriteLine(newDictionaryExpression.ToString())
' This code produces the following output:
'
' new Dictionary`2()
Use the New factory methods to create a NewExpression.
The value of the NodeType property of a NewExpression object is New.
Arguments |
Gets the arguments to the constructor. |
Can |
Indicates that the node can be reduced to a simpler node. If this returns true, Reduce() can be called to produce the reduced form. (Inherited from Expression) |
Constructor |
Gets the called constructor. |
Members |
Gets the members that can retrieve the values of the fields that were initialized with constructor arguments. |
Node |
Returns the node type of this Expression. |
Node |
Gets the node type of this Expression. (Inherited from Expression) |
Type |
Gets the static type of the expression that this Expression represents. |
Type |
Gets the static type of the expression that this Expression represents. (Inherited from Expression) |
Accept(Expression |
Dispatches to the specific visit method for this node type. For example, MethodCallExpression calls the VisitMethodCall(MethodCallExpression). |
Accept(Expression |
Dispatches to the specific visit method for this node type. For example, MethodCallExpression calls the VisitMethodCall(MethodCallExpression). (Inherited from Expression) |
Equals(Object) |
Determines whether the specified object is equal to the current object. (Inherited from Object) |
Get |
Serves as the default hash function. (Inherited from Object) |
Get |
Gets the Type of the current instance. (Inherited from Object) |
Memberwise |
Creates a shallow copy of the current Object. (Inherited from Object) |
Reduce() |
Reduces this node to a simpler expression. If CanReduce returns true, this should return a valid expression. This method can return another node which itself must be reduced. (Inherited from Expression) |
Reduce |
Reduces this node to a simpler expression. If CanReduce returns true, this should return a valid expression. This method can return another node which itself must be reduced. (Inherited from Expression) |
Reduce |
Reduces the expression to a known node type (that is not an Extension node) or just returns the expression if it is already a known type. (Inherited from Expression) |
To |
Returns a textual representation of the Expression. (Inherited from Expression) |
Update(IEnumerable<Expression>) |
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. |
Visit |
Reduces the node and then calls the visitor delegate on the reduced expression. The method throws an exception if the node is not reducible. (Inherited from Expression) |
IArgument |
Gets the number of arguments to the expression tree node. |
IArgument |
Returns the argument at index, throwing if index is out of bounds. |
מוצר | גירסאות |
---|---|
.NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 1.0, 1.1, 1.2, 1.3, 1.4, 1.6, 2.0, 2.1 |
UWP | 10.0 |
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