ExpressionType Enumeration
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Describes the node types for the nodes of an expression tree.
Assembly: System.Core (in System.Core.dll)
| Member name | Description | |
|---|---|---|
| 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 nullptr 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 the documentation on the CodePlex Web site.
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