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ExpressionType Enum

Definition

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

public enum class ExpressionType
public enum ExpressionType
type ExpressionType = 
Public Enum ExpressionType
Inheritance
ExpressionType

Fields

Name Value Description
Add 0

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

AddChecked 1

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

And 2

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

AndAlso 3

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.

ArrayLength 4

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

ArrayIndex 5

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

Call 6

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

Coalesce 7

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

Conditional 8

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

Constant 9

A constant value.

Convert 10

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 11

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.

Divide 12

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

Equal 13

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

ExclusiveOr 14

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

GreaterThan 15

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

GreaterThanOrEqual 16

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

Invoke 17

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

Lambda 18

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

LeftShift 19

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

LessThan 20

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

LessThanOrEqual 21

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

ListInit 22

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.

MemberAccess 23

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

MemberInit 24

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 25

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

Multiply 26

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

MultiplyChecked 27

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

Negate 28

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

UnaryPlus 29

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.

NegateChecked 30

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

New 31

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

NewArrayInit 32

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.

NewArrayBounds 33

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.

Not 34

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 35

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

Or 36

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

OrElse 37

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

Parameter 38

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

Power 39

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

Quote 40

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 41

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

Subtract 42

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

SubtractChecked 43

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

TypeAs 44

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.

TypeIs 45

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

Assign 46

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

Block 47

A block of expressions.

DebugInfo 48

Debugging information.

Decrement 49

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

Dynamic 50

A dynamic operation.

Default 51

A default value.

Extension 52

An extension expression.

Goto 53

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

Increment 54

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

Index 55

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

Label 56

A label.

RuntimeVariables 57

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

Loop 58

A loop, such as for or while.

Switch 59

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

Throw 60

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

Try 61

A try-catch expression.

Unbox 62

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

AddAssign 63

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

AndAssign 64

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

DivideAssign 65

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

ExclusiveOrAssign 66

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

LeftShiftAssign 67

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

ModuloAssign 68

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

MultiplyAssign 69

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

OrAssign 70

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

PowerAssign 71

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

RightShiftAssign 72

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

SubtractAssign 73

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

AddAssignChecked 74

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

MultiplyAssignChecked 75

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

SubtractAssignChecked 76

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

PreIncrementAssign 77

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

PreDecrementAssign 78

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

PostIncrementAssign 79

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

PostDecrementAssign 80

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

TypeEqual 81

An exact type test.

OnesComplement 82

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

IsTrue 83

A true condition value.

IsFalse 84

A false condition value.

Remarks

For more information about each enumeration value of this type, see Dynamic Language Runtime Overview.

Applies to