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

Add	0	An addition operation, such as a + b, without overflow checking, for numeric operands.
AddAssign	63	An addition 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.
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.
AndAssign	64	A bitwise or logical AND compound assignment operation, such as (a &= b) in C#.
ArrayIndex	5	An indexing operation in a one-dimensional array, such as array[index] in C# or array(index) in Visual Basic.
ArrayLength	4	An operation that obtains the length of a one-dimensional array, such as array.Length.
Assign	46	An assignment operation, such as (a = b).
Block	47	A block of expressions.
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.
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.
Default	51	A default value.
Divide	12	A division operation, such as (a / b), for numeric operands.
DivideAssign	65	An division compound assignment operation, such as (a /= b), for numeric operands.
Dynamic	50	A dynamic operation.
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.
ExclusiveOrAssign	66	A bitwise or logical XOR compound assignment operation, such as (a ^= b) in C#.
Extension	52	An extension expression.
Goto	53	A "go to" expression, such as goto Label in C# or GoTo Label 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).
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.
Invoke	17	An operation that invokes a delegate or lambda expression, such as sampleDelegate.Invoke().
IsFalse	84	A false condition value.
IsTrue	83	A true condition value.
Label	56	A label.
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).
LeftShiftAssign	67	A bitwise left-shift compound assignment, 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.
Loop	58	A loop, such as for or while.
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.
ModuloAssign	68	An arithmetic remainder compound assignment operation, such as (a %= b) in C#.
Multiply	26	A multiplication operation, such as (a * b), without overflow checking, for numeric operands.
MultiplyAssign	69	A multiplication compound assignment operation, such as (a *= b), without overflow checking, for numeric operands.
MultiplyAssignChecked	75	A multiplication compound assignment operation, such as (a *= b), that has 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.
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().
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.
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.
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.
OnesComplement	82	A ones complement operation, such as (~a) in C#.
Or	36	A bitwise or logical OR operation, such as (a | b) in C# or (a Or b) in Visual Basic.
OrAssign	70	A bitwise or logical OR compound assignment, such as (a |= b) in C#.
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.
PostDecrementAssign	80	A unary postfix 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.
Power	39	A mathematical operation that raises a number to a power, such as (a ^ b) in Visual Basic.
PowerAssign	71	A compound assignment operation that raises a number to a power, such as (a ^= b) in Visual Basic.
PreDecrementAssign	78	A unary prefix decrement, such as (--a). The object a should be modified in place.
PreIncrementAssign	77	A unary prefix increment, such as (++a). The object a should be modified in place.
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).
RightShiftAssign	72	A bitwise right-shift compound assignment operation, such as (a >>= b).
RuntimeVariables	57	A list of run-time variables. For more information, see RuntimeVariablesExpression.
Subtract	42	A subtraction operation, such as (a - b), without overflow checking, for numeric operands.
SubtractAssign	73	A subtraction compound assignment operation, such as (a -= b), without overflow checking, for numeric operands.
SubtractAssignChecked	76	A subtraction compound assignment operation, such as (a -= b), that has overflow checking, for numeric operands.
SubtractChecked	43	An arithmetic subtraction operation, such as (a - b), that has overflow checking, for numeric operands.
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.
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.
TypeEqual	81	An exact type test.
TypeIs	45	A type test, such as obj is SampleType in C# or TypeOf obj is SampleType in Visual Basic.
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.
Unbox	62	An unbox value type operation, such as unbox and unbox.any instructions in MSIL.

Remarks

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