ExpressionType Enum

Definition

Namespace:

System.Linq.Expressions

Assembly:

System.Linq.Expressions.dll

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

public enum class ExpressionType

public enum ExpressionType

type ExpressionType = 

Public Enum ExpressionType

Inheritance

Object

ValueType

Enum

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.