ExpressionType Enumeration

ExpressionType Enumeration

 

Describes the node types for the nodes of an expression tree.

Namespace:   System.Linq.Expressions
Assembly:  System.Core (in System.Core.dll)

public enum ExpressionType

Member nameDescription
Add

An addition operation, such as a + b, without overflow checking, for numeric operands.

AddAssign

An addition compound assignment operation, such as (a += b), without overflow checking, for numeric operands.

AddAssignChecked

An addition compound assignment operation, such as (a += b), with overflow checking, for numeric operands.

AddChecked

An addition operation, such as (a + b), with overflow checking, for numeric operands.

And

A bitwise or logical AND operation, such as (a & b) in C# and (a And b) in Visual Basic.

AndAlso

A conditional AND operation that evaluates the second operand only if the first operand evaluates to true. It corresponds to (a && b) in C# and (a AndAlso b) in Visual Basic.

AndAssign

A bitwise or logical AND compound assignment operation, such as (a &= b) in C#.

ArrayIndex

An indexing operation in a one-dimensional array, such as array[index] in C# or array(index) in Visual Basic.

ArrayLength

An operation that obtains the length of a one-dimensional array, such as array.Length.

Assign

An assignment operation, such as (a = b).

Block

A block of expressions.

Call

A method call, such as in the obj.sampleMethod() expression.

Coalesce

A node that represents a null coalescing operation, such as (a ?? b) in C# or If(a, b) in Visual Basic.

Conditional

A conditional operation, such as a > b ? a : b in C# or If(a > b, a, b) in Visual Basic.

Constant

A constant value.

Convert

A cast or conversion operation, such as (SampleType)obj in C#or CType(obj, SampleType) in Visual Basic. For a numeric conversion, if the converted value is too large for the destination type, no exception is thrown.

ConvertChecked

A cast or conversion operation, such as (SampleType)obj in C#or CType(obj, SampleType) in Visual Basic. For a numeric conversion, if the converted value does not fit the destination type, an exception is thrown.

DebugInfo

Debugging information.

Decrement

A unary decrement operation, such as (a - 1) in C# and Visual Basic. The object a should not be modified in place.

Default

A default value.

Divide

A division operation, such as (a / b), for numeric operands.

DivideAssign

An division compound assignment operation, such as (a /= b), for numeric operands.

Dynamic

A dynamic operation.

Equal

A node that represents an equality comparison, such as (a == b) in C# or (a = b) in Visual Basic.

ExclusiveOr

A bitwise or logical XOR operation, such as (a ^ b) in C# or (a Xor b) in Visual Basic.

ExclusiveOrAssign

A bitwise or logical XOR compound assignment operation, such as (a ^= b) in C#.

Extension

An extension expression.

Goto

A "go to" expression, such as goto Label in C# or GoTo Label in Visual Basic.

GreaterThan

A "greater than" comparison, such as (a > b).

GreaterThanOrEqual

A "greater than or equal to" comparison, such as (a >= b).

Increment

A unary increment operation, such as (a + 1) in C# and Visual Basic. The object a should not be modified in place.

Index

An index operation or an operation that accesses a property that takes arguments.

Invoke

An operation that invokes a delegate or lambda expression, such as sampleDelegate.Invoke().

IsFalse

A false condition value.

IsTrue

A true condition value.

Label

A label.

Lambda

A lambda expression, such as a => a + a in C# or Function(a) a + a in Visual Basic.

LeftShift

A bitwise left-shift operation, such as (a << b).

LeftShiftAssign

A bitwise left-shift compound assignment, such as (a <<= b).

LessThan

A "less than" comparison, such as (a < b).

LessThanOrEqual

A "less than or equal to" comparison, such as (a <= b).

ListInit

An operation that creates a new IEnumerable object and initializes it from a list of elements, such as new List<SampleType>(){ a, b, c } in C# or Dim sampleList = { a, b, c } in Visual Basic.

Loop

A loop, such as for or while.

MemberAccess

An operation that reads from a field or property, such as obj.SampleProperty.

MemberInit

An operation that creates a new object and initializes one or more of its members, such as new Point { X = 1, Y = 2 } in C# or New Point With {.X = 1, .Y = 2} in Visual Basic.

Modulo

An arithmetic remainder operation, such as (a % b) in C# or (a Mod b) in Visual Basic.

ModuloAssign

An arithmetic remainder compound assignment operation, such as (a %= b) in C#.

Multiply

A multiplication operation, such as (a * b), without overflow checking, for numeric operands.

MultiplyAssign

A multiplication compound assignment operation, such as (a *= b), without overflow checking, for numeric operands.

MultiplyAssignChecked

A multiplication compound assignment operation, such as (a *= b), that has overflow checking, for numeric operands.

MultiplyChecked

An multiplication operation, such as (a * b), that has overflow checking, for numeric operands.

Negate

An arithmetic negation operation, such as (-a). The object a should not be modified in place.

NegateChecked

An arithmetic negation operation, such as (-a), that has overflow checking. The object a should not be modified in place.

New

An operation that calls a constructor to create a new object, such as new SampleType().

NewArrayBounds

An operation that creates a new array, in which the bounds for each dimension are specified, such as new SampleType[dim1, dim2] in C# or New SampleType(dim1, dim2) in Visual Basic.

NewArrayInit

An operation that creates a new one-dimensional array and initializes it from a list of elements, such as new SampleType[]{a, b, c} in C# or New SampleType(){a, b, c} in Visual Basic.

Not

A bitwise complement or logical negation operation. In C#, it is equivalent to (~a) for integral types and to (!a) for Boolean values. In Visual Basic, it is equivalent to (Not a). The object a should not be modified in place.

NotEqual

An inequality comparison, such as (a != b) in C# or (a <> b) in Visual Basic.

OnesComplement

A ones complement operation, such as (~a) in C#.

Or

A bitwise or logical OR operation, such as (a | b) in C# or (a Or b) in Visual Basic.

OrAssign

A bitwise or logical OR compound assignment, such as (a |= b) in C#.

OrElse

A short-circuiting conditional OR operation, such as (a || b) in C# or (a OrElse b) in Visual Basic.

Parameter

A reference to a parameter or variable that is defined in the context of the expression. For more information, see ParameterExpression.

PostDecrementAssign

A unary postfix decrement, such as (a--). The object a should be modified in place.

PostIncrementAssign

A unary postfix increment, such as (a++). The object a should be modified in place.

Power

A mathematical operation that raises a number to a power, such as (a ^ b) in Visual Basic.

PowerAssign

A compound assignment operation that raises a number to a power, such as (a ^= b) in Visual Basic.

PreDecrementAssign

A unary prefix decrement, such as (--a). The object a should be modified in place.

PreIncrementAssign

A unary prefix increment, such as (++a). The object a should be modified in place.

Quote

An expression that has a constant value of type Expression. A Quote node can contain references to parameters that are defined in the context of the expression it represents.

RightShift

A bitwise right-shift operation, such as (a >> b).

RightShiftAssign

A bitwise right-shift compound assignment operation, such as (a >>= b).

RuntimeVariables

A list of run-time variables. For more information, see RuntimeVariablesExpression.

Subtract

A subtraction operation, such as (a - b), without overflow checking, for numeric operands.

SubtractAssign

A subtraction compound assignment operation, such as (a -= b), without overflow checking, for numeric operands.

SubtractAssignChecked

A subtraction compound assignment operation, such as (a -= b), that has overflow checking, for numeric operands.

SubtractChecked

An arithmetic subtraction operation, such as (a - b), that has overflow checking, for numeric operands.

Switch

A switch operation, such as switch in C# or Select Case in Visual Basic.

Throw

An operation that throws an exception, such as throw new Exception().

Try

A try-catch expression.

TypeAs

An explicit reference or boxing conversion in which null is supplied if the conversion fails, such as (obj as SampleType) in C# or TryCast(obj, SampleType) in Visual Basic.

TypeEqual

An exact type test.

TypeIs

A type test, such as obj is SampleType in C# or TypeOf obj is SampleType in Visual Basic.

UnaryPlus

A unary plus operation, such as (+a). The result of a predefined unary plus operation is the value of the operand, but user-defined implementations might have unusual results.

Unbox

An unbox value type operation, such as unbox and unbox.any instructions in MSIL.

For more information about each enumeration value of this type, see section 4.4 of expr-tree-spec.doc or expr-tree-spec.pdf on the Microsoft Dynamic Language Runtime page of the Codeplex website.

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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