Represents an expression that has a constant value.
Assembly: System.Core (in System.Core.dll)
Thetype exposes the following members.
|CanReduce||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.)|
|NodeType||Returns the node type of this Expression. Extension nodes should return Extension when overriding this method. (Overrides Expression.NodeType.)|
|Type||Gets the static type of the expression that this Expression represents. (Overrides Expression.Type.)|
|Value||Gets the value of the constant expression.|
|Accept||Dispatches to the specific visit method for this node type. For example, MethodCallExpression calls the VisitMethodCall. (Overrides Expression.Accept(ExpressionVisitor).)|
|Equals(Object)||Determines whether the specified object is equal to the current object. (Inherited from 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.)|
|GetHashCode||Serves as the default hash function. (Inherited from Object.)|
|GetType||Gets the Type of the current instance. (Inherited from Object.)|
|MemberwiseClone||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.)|
|ReduceAndCheck||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.)|
|ReduceExtensions||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.)|
|ToString||Returns a textual representation of the Expression. (Inherited from Expression.)|
|VisitChildren||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.)|
The following code example shows how to create an expression that represents a constant value by using the Constant method.
// Add the following directive to your file: // using System.Linq.Expressions; // This expression represents a Constant value. Expression constantExpr = Expression.Constant(5.5); // Print out the expression. Console.WriteLine(constantExpr.ToString()); // You can also use variables. double num = 3.5; constantExpr = Expression.Constant(num); Console.WriteLine(constantExpr.ToString()); // This code example produces the following output: // // 5.5 // 3.5
.NET FrameworkSupported in: 4.5.2, 4.5.1, 4.5, 4, 3.5
.NET Framework Client ProfileSupported in: 4, 3.5 SP1
Portable Class LibrarySupported in: Portable Class Library
.NET for Windows Store appsSupported in: Windows 8
.NET for Windows Phone appsSupported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1
Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.