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 System.Linq.Expressions.Expression provides the root of a class hierarchy used to model expression trees.
The classes in this namespace that derive from System.Linq.Expressions.Expression, for example System.Linq.Expressions.MemberExpression and System.Linq.Expressions.ParameterExpression, are used to represent nodes in an expression tree. The System.Linq.Expressions.Expression class contains static (Shared in Visual Basic) factory methods to create expression tree nodes of the various types.
The enumeration type System.Linq.Expressions.ExpressionType specifies the unique node types.
Type | Reason |
---|---|
BinaryExpression |
Represents an expression that has a binary operator. |
BlockExpression |
Represents a block that contains a sequence of expressions where variables can be defined. |
CatchBlock |
Represents a catch statement in a try block. |
ConditionalExpression |
Represents an expression that has a conditional operator. |
ConstantExpression |
Represents an expression that has a constant value. |
DebugInfoExpression |
Emits or clears a sequence point for debug information. This allows the debugger to highlight the correct source code when debugging. |
DefaultExpression |
Represents the default value of a type or an empty expression. |
DynamicExpression |
Represents a dynamic operation. |
DynamicExpressionVisitor |
Represents a visitor or rewriter for dynamic expression trees. |
ElementInit |
Represents an initializer for a single element of an IEnumerable collection. |
Expression |
Provides 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. |
Expression<TDelegate> |
Represents a strongly typed lambda expression as a data structure in the form of an expression tree. This class cannot be inherited. |
ExpressionType |
Describes the node types for the nodes of an expression tree. |
ExpressionVisitor |
Represents a visitor or rewriter for expression trees. |
GotoExpression |
Represents an unconditional jump. This includes return statements, break and continue statements, and other jumps. |
GotoExpressionKind |
Specifies what kind of jump this System.Linq.Expressions.GotoExpression represents. |
IndexExpression |
Represents indexing a property or array. |
InvocationExpression |
Represents an expression that applies a delegate or lambda expression to a list of argument expressions. |
LabelExpression |
Represents a label, which can be put in any System.Linq.Expressions.Expression context. If it is jumped to, it will get the value provided by the corresponding System.Linq.Expressions.GotoExpression. Otherwise, it receives the value in System.Linq.Expressions.LabelExpression.DefaultValue. If the Type equals System.Void, no value should be provided. |
LabelTarget |
Used to represent the target of a System.Linq.Expressions.GotoExpression. |
LambdaExpression |
Describes a lambda expression. This captures a block of code that is similar to a .NET method body. |
ListInitExpression |
Represents a constructor call that has a collection initializer. |
LoopExpression |
Represents an infinite loop. It can be exited with "break". |
MemberAssignment |
Represents assignment operation for a field or property of an object. |
MemberBinding |
Provides the base class from which the classes that represent bindings that are used to initialize members of a newly created object derive. |
MemberBindingType |
Describes the binding types that are used in System.Linq.Expressions.MemberInitExpression objects. |
MemberExpression |
Represents accessing a field or property. |
MemberInitExpression |
Represents calling a constructor and initializing one or more members of the new object. |
MemberListBinding |
Represents initializing the elements of a collection member of a newly created object. |
MemberMemberBinding |
Represents initializing members of a member of a newly created object. |
MethodCallExpression |
Represents a call to either static or an instance method. |
NewArrayExpression |
Represents creating a new array and possibly initializing the elements of the new array. |
NewExpression |
Represents a constructor call. |
ParameterExpression |
Represents a named parameter expression. |
RuntimeVariablesExpression |
An expression that provides runtime read/write permission for variables. |
SwitchCase |
Represents one case of a System.Linq.Expressions.SwitchExpression. |
SwitchExpression |
Represents a control expression that handles multiple selections by passing control to System.Linq.Expressions.SwitchCase. |
SymbolDocumentInfo |
Stores information necessary to emit debugging symbol information for a source file, in particular the file name and unique language identifier. |
TryExpression |
Represents a try/catch/finally/fault block. |
TypeBinaryExpression |
Represents an operation between an expression and a type. |
UnaryExpression |
Represents an expression that has a unary operator. |