System.Data.Common.CommandTrees Namespace

Provides classes to build expressions that make up a command tree.

Classes

DbAggregate	Implements the basic functionality required by aggregates in a GroupBy clause.
DbAndExpression	Represents the logical AND of two Boolean arguments. This class cannot be inherited.
DbApplyExpression	Represents an apply operation, which is the invocation of the specified function for each element in the specified input set. This class cannot be inherited.
DbArithmeticExpression	Represents an arithmetic operation applied to numeric arguments. Addition, subtraction, multiplication, division, modulo, and negation are arithmetic operations. This class cannot be inherited.
DbBinaryExpression	Implements the basic functionality required by expressions that accept two expression operands.
DbCaseExpression	Represents the When, Then, and Else clauses of the DbCaseExpression. This class cannot be inherited.
DbCastExpression	Represents the type conversion of a single argument to the specified type. This class cannot be inherited.
DbCommandTree	An immutable class that implements the basic functionality for the Query, Insert, Update, Delete, and function invocation command tree types.
DbComparisonExpression	Represents a comparison operation applied to two arguments. Equality, greater than, greater than or equal, less than, less than or equal, and inequality are comparison operations. This class cannot be inherited.
DbConstantExpression	Represents different kinds of constants (literals). This class cannot be inherited.
DbCrossJoinExpression	Represents an unconditional join operation between the given collection arguments. This class cannot be inherited.
DbDeleteCommandTree	Represents a single row delete operation expressed as a command tree. This class cannot be inherited.
DbDerefExpression	Represents the an expression that retrieves an entity based on the specified reference. This class cannot be inherited.
DbDistinctExpression	Removes duplicate elements from the specified set argument. This class cannot be inherited.
DbElementExpression	Represents the conversion of the specified set argument to a singleton. This class cannot be inherited.
DbEntityRefExpression	Represents an expression that extracts a reference from the underlying entity instance. This class cannot be inherited.
DbExceptExpression	Represents the set subtraction operation between the left and right operands. This class cannot be inherited.
DbExpression	Represents the base type for all expressions.
DbExpressionBinding	Represents an input set to relational expressions such as DbFilterExpression, DbProjectExpression, and DbJoinExpression. This class cannot be inherited.
DbExpressionVisitor	Defines the basic functionality that should be implemented by visitors that do not return a result value.
DbExpressionVisitor<TResultType>	Defines the basic functionality that should be implemented by visitors that return a result value of a specific type.
DbFilterExpression	Represents a predicate applied to filter an input set. This produces the set of elements that satisfy the predicate. This class cannot be inherited.
DbFunctionAggregate	Supports standard aggregate functions, such as MIN, MAX, AVG, SUM, and so on. This class cannot be inherited.
DbFunctionCommandTree	Represents the invocation of a database function.
DbFunctionExpression	Represents an invocation of a function. This class cannot be inherited.
DbGroupAggregate	Represents a collection of elements that compose a group.
DbGroupByExpression	Represents a group by operation. A group by operation is a grouping of the elements in the input set based on the specified key expressions followed by the application of the specified aggregates. This class cannot be inherited.
DbGroupExpressionBinding	Defines the binding for the input set to a DbGroupByExpression. This class cannot be inherited.
DbInsertCommandTree	Represents a single row insert operation expressed as a command tree. This class cannot be inherited.
DbIntersectExpression	Represents the set intersection operation between the left and right operands. This class cannot be inherited.
DbIsEmptyExpression	Represents an empty set determination applied to a single set argument. This class cannot be inherited.
DbIsNullExpression	Represents null determination applied to a single argument. This class cannot be inherited.
DbIsOfExpression	Represents the type comparison of a single argument against the specified type. This class cannot be inherited.
DbJoinExpression	Represents an inner, left outer, or full outer join operation between the given collection arguments on the specified join condition.
DbLambda	Represents a Lambda function that can be invoked to produce a DbLambdaExpression.
DbLambdaExpression	Allows the application of a lambda function to arguments represented by DbExpression objects.
DbLikeExpression	Represents a string comparison against the specified pattern with an optional escape string. This class cannot be inherited.
DbLimitExpression	Represents the restriction of the number of elements in the argument collection to the specified limit value.
DbModificationClause	Specifies a single clause in an insert or update modification operation.
DbModificationCommandTree	Represents a data manipulation language (DML) operation expressed as a command tree.
DbNewInstanceExpression	Represents the construction of a new instance of a given type, including set and record types. This class cannot be inherited.
DbNotExpression	Represents the logical NOT of a single Boolean argument. This class cannot be inherited.
DbNullExpression	Represents a reference to a typed null literal. This class cannot be inherited.
DbOfTypeExpression	Represents the retrieval of elements of the specified type from the given set argument. This class cannot be inherited.
DbOrExpression	Represents the logical OR of two Boolean arguments. This class cannot be inherited.
DbParameterReferenceExpression	Represents a reference to a parameter declared on the command tree that contains this expression. This class cannot be inherited.
DbProjectExpression	Represents the projection of a given input set over the specified expression. This class cannot be inherited.
DbPropertyExpression	Provides methods and properties for retrieving an instance property. This class cannot be inherited.
DbQuantifierExpression	Represents a quantifier operation of the specified kind over the elements of the specified input set. This class cannot be inherited.
DbQueryCommandTree	Represents a query operation expressed as a command tree. This class cannot be inherited.
DbRefExpression	Represents a strongly typed reference to a specific instance within an entity set. This class cannot be inherited.
DbRefKeyExpression	Represents the retrieval of the key value (in its structural form) from the underlying reference value. This class cannot be inherited.
DbRelationshipNavigationExpression	Represents the navigation of a relationship. This class cannot be inherited.
DbScanExpression	Represents a scan over an entity set or relationship set, as indicated by the Target property. This class cannot be inherited.
DbSetClause	Specifies the clause in a modification operation that sets the value of a property. This class cannot be inherited.
DbSkipExpression	Skips a specified number of elements in the input set. DbSkipExpression can only be used after the input collection has been sorted as specified by the sort keys.
DbSortClause	Specifies a sort key that can be used as part of the sort order in a DbSortExpression. This class cannot be inherited.
DbSortExpression	Represents a sort operation applied to the elements of the specified input set based on the given sort keys. This class cannot be inherited.
DbTreatExpression	Represents a type conversion operation applied to a polymorphic argument. This class cannot be inherited.
DbUnaryExpression	Implements the basic functionality required by expressions that accept a single expression argument.
DbUnionAllExpression	Represents the set union (without duplicate removal) operation between the left and right operands. This class cannot be inherited.
DbUpdateCommandTree	Represents a single-row update operation expressed as a command tree. This class cannot be inherited.
DbVariableReferenceExpression	Represents a reference to a variable that is currently in scope. This class cannot be inherited.
DefaultExpressionVisitor	Visits each element of an expression tree from a given root expression. If any element changes, the tree is rebuilt back to the root and the new root expression is returned; otherwise the original root expression is returned.

Enums

DbExpressionKind

Contains values that each expression class uses to denote the operation it represents. The ExpressionKind property of an DbExpression can be retrieved to determine which operation that expression represents.

Remarks

A command trees is an object model representation of a query that can be used to represent query, update, insert, and delete commands in the ADO.NET Entity Data Model (EDM) and storage metadata.