System.Linq.Expressions Namespace

July 28, 2014

The System.Linq.Expressions namespace contains classes, interfaces and enumerations that enable language-level code expressions to be represented as objects in the form of expression trees.

The abstract class Expression provides the root of a class hierarchy used to model expression trees.

The classes in this namespace that derive from Expression, for example MemberExpression and ParameterExpression, are used to represent nodes in an expression tree. The Expression class contains static (Shared in Visual Basic) factory methods to create expression tree nodes of the various types.

The enumeration type ExpressionType specifies the unique node types.

  ClassDescription
Public classBinaryExpressionRepresents an expression that has a binary operator.
Public classBlockExpressionRepresents a block that contains a sequence of expressions where variables can be defined.
Public classCatchBlockRepresents a catch statement in a try block.
Public classConditionalExpressionRepresents an expression that has a conditional operator.
Public classConstantExpressionRepresents an expression that has a constant value.
Public classDebugInfoExpressionEmits or clears a sequence point for debug information. This allows the debugger to highlight the correct source code when debugging.
Public classDefaultExpressionRepresents the default value of a type or an empty expression.
Public classDynamicExpressionRepresents a dynamic operation.
Public classDynamicExpressionVisitorRepresents a visitor or rewriter for dynamic expression trees.
Public classElementInitRepresents an initializer for a single element of an IEnumerable collection.
Public classExpressionProvides the base class from which the classes that represent expression tree nodes are derived. It also contains static (Shared in Visual Basic) factory methods to create the various node types. This is an abstract class.
Public classExpression<TDelegate>Represents a strongly typed lambda expression as a data structure in the form of an expression tree. This class cannot be inherited.
Public classExpressionVisitorRepresents a visitor or rewriter for expression trees.
Public classGotoExpressionRepresents an unconditional jump. This includes return statements, break and continue statements, and other jumps.
Public classIndexExpressionRepresents indexing a property or array.
Public classInvocationExpressionRepresents an expression that applies a delegate or lambda expression to a list of argument expressions.
Public classLabelExpressionRepresents a label, which can be put in any Expression context. If it is jumped to, it will get the value provided by the corresponding GotoExpression. Otherwise, it receives the value in DefaultValue. If the Type equals System.Void, no value should be provided.
Public classLabelTargetUsed to represent the target of a GotoExpression.
Public classLambdaExpressionDescribes a lambda expression. This captures a block of code that is similar to a .NET method body.
Public classListInitExpressionRepresents a constructor call that has a collection initializer.
Public classLoopExpressionRepresents an infinite loop. It can be exited with "break".
Public classMemberAssignmentRepresents assignment operation for a field or property of an object.
Public classMemberBindingProvides the base class from which the classes that represent bindings that are used to initialize members of a newly created object derive.
Public classMemberExpressionRepresents accessing a field or property.
Public classMemberInitExpressionRepresents calling a constructor and initializing one or more members of the new object.
Public classMemberListBindingRepresents initializing the elements of a collection member of a newly created object.
Public classMemberMemberBindingRepresents initializing members of a member of a newly created object.
Public classMethodCallExpressionRepresents a call to either static or an instance method.
Public classNewArrayExpressionRepresents creating a new array and possibly initializing the elements of the new array.
Public classNewExpressionRepresents a constructor call.
Public classParameterExpressionRepresents a named parameter expression.
Public classRuntimeVariablesExpressionAn expression that provides runtime read/write permission for variables.
Public classSwitchCaseRepresents one case of a SwitchExpression.
Public classSwitchExpressionRepresents a control expression that handles multiple selections by passing control to SwitchCase.
Public classSymbolDocumentInfoStores information necessary to emit debugging symbol information for a source file, in particular the file name and unique language identifier.
Public classTryExpressionRepresents a try/catch/finally/fault block.
Public classTypeBinaryExpressionRepresents an operation between an expression and a type.
Public classUnaryExpressionRepresents an expression that has a unary operator.

  EnumerationDescription
Public enumerationExpressionTypeDescribes the node types for the nodes of an expression tree.
Public enumerationGotoExpressionKindSpecifies what kind of jump this GotoExpression represents.
Public enumerationMemberBindingTypeDescribes the binding types that are used in MemberInitExpression objects.

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