ExpressionType Enumeration
Describes the node types for the nodes of an expression tree.
Assembly: System.Core (in System.Core.dll)
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Add | An addition operation, such as a + b, without overflow checking, for numeric operands. |
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AddChecked | An addition operation, such as (a + b), with overflow checking, for numeric operands. |
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And | A bitwise or logical AND operation, such as (a & b) in C# and (a And b) in Visual Basic. |
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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. |
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ArrayLength | An operation that obtains the length of a one-dimensional array, such as array.Length. |
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ArrayIndex | An indexing operation in a one-dimensional array, such as array[index] in C# or array(index) in Visual Basic. |
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Call | A method call, such as in the obj.sampleMethod() expression. |
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Coalesce | A node that represents a null coalescing operation, such as (a ?? b) in C# or If(a, b) in Visual Basic. |
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Conditional | A conditional operation, such as a > b ? a : b in C# or If(a > b, a, b) in Visual Basic. |
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Constant | A constant value. |
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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. |
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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. |
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Divide | A division operation, such as (a / b), for numeric operands. |
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Equal | A node that represents an equality comparison, such as (a == b) in C# or (a = b) in Visual Basic. |
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ExclusiveOr | A bitwise or logical XOR operation, such as (a ^ b) in C# or (a Xor b) in Visual Basic. |
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GreaterThan | A "greater than" comparison, such as (a > b). |
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GreaterThanOrEqual | A "greater than or equal to" comparison, such as (a >= b). |
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Invoke | An operation that invokes a delegate or lambda expression, such as sampleDelegate.Invoke(). |
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Lambda | A lambda expression, such as a => a + a in C# or Function(a) a + a in Visual Basic. |
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LeftShift | A bitwise left-shift operation, such as (a << b). |
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LessThan | A "less than" comparison, such as (a < b). |
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LessThanOrEqual | A "less than or equal to" comparison, such as (a <= b). |
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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. |
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MemberAccess | An operation that reads from a field or property, such as obj.SampleProperty. |
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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. |
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Modulo | An arithmetic remainder operation, such as (a % b) in C# or (a Mod b) in Visual Basic. |
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Multiply | A multiplication operation, such as (a * b), without overflow checking, for numeric operands. |
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MultiplyChecked | An multiplication operation, such as (a * b), that has overflow checking, for numeric operands. |
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Negate | An arithmetic negation operation, such as (-a). The object a should not be modified in place. |
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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. |
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NegateChecked | An arithmetic negation operation, such as (-a), that has overflow checking. The object a should not be modified in place. |
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New | An operation that calls a constructor to create a new object, such as new SampleType(). |
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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. |
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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. |
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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. |
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NotEqual | An inequality comparison, such as (a != b) in C# or (a <> b) in Visual Basic. |
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Or | A bitwise or logical OR operation, such as (a | b) in C# or (a Or b) in Visual Basic. |
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OrElse | A short-circuiting conditional OR operation, such as (a || b) in C# or (a OrElse b) in Visual Basic. |
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Parameter | A reference to a parameter or variable that is defined in the context of the expression. For more information, see ParameterExpression. |
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Power | A mathematical operation that raises a number to a power, such as (a ^ b) in Visual Basic. |
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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. |
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RightShift | A bitwise right-shift operation, such as (a >> b). |
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Subtract | A subtraction operation, such as (a - b), without overflow checking, for numeric operands. |
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SubtractChecked | An arithmetic subtraction operation, such as (a - b), that has overflow checking, for numeric operands. |
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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. |
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TypeIs | A type test, such as obj is SampleType in C# or TypeOf obj is SampleType in Visual Basic. |
| Assign | An assignment operation, such as (a = b). | |
| Block | A block of expressions. | |
| 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. | |
| Dynamic | A dynamic operation. | |
| Default | A default value. | |
| Extension | An extension expression. | |
| Goto | A "go to" expression, such as goto Label in C# or GoTo Label in Visual Basic. | |
| 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. | |
| Label | A label. | |
| RuntimeVariables | A list of run-time variables. For more information, see RuntimeVariablesExpression. | |
| Loop | A loop, such as for or while. | |
| 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. | |
| Unbox | An unbox value type operation, such as unbox and unbox.any instructions in MSIL. | |
| AddAssign | An addition compound assignment operation, such as (a += b), without overflow checking, for numeric operands. | |
| AndAssign | A bitwise or logical AND compound assignment operation, such as (a &= b) in C#. | |
| DivideAssign | An division compound assignment operation, such as (a /= b), for numeric operands. | |
| ExclusiveOrAssign | A bitwise or logical XOR compound assignment operation, such as (a ^= b) in C#. | |
| LeftShiftAssign | A bitwise left-shift compound assignment, such as (a <<= b). | |
| ModuloAssign | An arithmetic remainder compound assignment operation, such as (a %= b) in C#. | |
| MultiplyAssign | A multiplication compound assignment operation, such as (a *= b), without overflow checking, for numeric operands. | |
| OrAssign | A bitwise or logical OR compound assignment, such as (a |= b) in C#. | |
| PowerAssign | A compound assignment operation that raises a number to a power, such as (a ^= b) in Visual Basic. | |
| RightShiftAssign | A bitwise right-shift compound assignment operation, such as (a >>= b). | |
| SubtractAssign | A subtraction 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. | |
| MultiplyAssignChecked | A multiplication compound assignment operation, such as (a *= b), that has overflow checking, for numeric operands. | |
| SubtractAssignChecked | A subtraction compound assignment operation, such as (a -= b), that has overflow checking, for numeric operands. | |
| PreIncrementAssign | A unary prefix increment, such as (++a). The object a should be modified in place. | |
| PreDecrementAssign | A unary prefix 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. | |
| PostDecrementAssign | A unary postfix decrement, such as (a--). The object a should be modified in place. | |
| TypeEqual | An exact type test. | |
| OnesComplement | A ones complement operation, such as (~a) in C#. | |
| IsTrue | A true condition value. | |
| IsFalse | A false condition value. |
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.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
