Represents an expression that has a unary operator.
Assemblies: System.Linq.Expressions (in System.Linq.Expressions.dll)
System.Core (in System.Core.dll)
Thetype exposes the following members.
|CanReduce||Gets a value that indicates whether the expression tree node can be reduced. (Overrides Expression.CanReduce.)|
|IsLifted||Gets a value that indicates whether the expression tree node represents a lifted call to an operator.|
|IsLiftedToNull||Gets a value that indicates whether the expression tree node represents a lifted call to an operator whose return type is lifted to a nullable type.|
|Method||Gets the implementing method for the unary operation.|
|NodeType||Returns the node type of this Expression. (Overrides Expression.NodeType.)|
|Operand||Gets the operand of the unary operation.|
|Type||Gets the static type of the expression that this Expression represents. (Overrides Expression.Type.)|
|Accept||Dispatches to the specific visit method for this node type. For example, MethodCallExpression calls the VisitMethodCall. (Inherited from Expression.)|
|Equals(Object)||Determines whether the specified object is equal to the current object. (Inherited from Object.)|
|GetHashCode||Serves as the default hash function. (Inherited from Object.)|
|GetType||Gets the Type of the current instance. (Inherited from Object.)|
|Reduce||Reduces the expression node to a simpler expression. (Overrides Expression.Reduce().)|
|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.)|
|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.|
|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 table summarizes the factory methods that can be used to create a that has a specific node type.
In addition, the MakeUnary methods can also be used to create a . These factory methods can be used to create a of any node type that represents a unary operation. The parameter of these methods that is of type NodeType specifies the desired node type.
The following example creates a object that represents the reference conversion of a non-nullable integer expression to the nullable integer type.
// Create a UnaryExpression that represents a // conversion of an int to an int?. System.Linq.Expressions.UnaryExpression typeAsExpression = System.Linq.Expressions.Expression.TypeAs( System.Linq.Expressions.Expression.Constant(34, typeof(int)), typeof(int?)); Console.WriteLine(typeAsExpression.ToString()); // This code produces the following output: // // (34 As Nullable`1)