DbExpressionKind 枚举
定义
包含每个表达式类用来表示它所代表的运算的值。 可以检索 ExpressionKind 的 DbExpression 属性来确定该表达式所代表的运算。The ExpressionKind property of an DbExpression can be retrieved to determine which operation that expression represents.
public enum class DbExpressionKindpublic enum DbExpressionKindtype DbExpressionKind = Public Enum DbExpressionKind- 继承
字段
| All | 0 |
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| And | 1 | 逻辑与表达式。Logical AND expressions. |
| Any | 2 |
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| Case | 3 | 条件 Case 语句表达式。Conditional case statement expressions. |
| Cast | 4 | 多态类型转换表达式。Polymorphic type cast expressions. |
| Constant | 5 | 常量值表达式。Constant value expressions. |
| CrossApply | 6 | 交叉应用表达式。Cross apply expressions. |
| CrossJoin | 7 | 交叉联接表达式。Cross join expressions. |
| Deref | 8 | 取消引用表达式。Dereference expressions. |
| Distinct | 9 | 重复删除表达式。Duplicate removal expressions. |
| Divide | 10 | 除法表达式。Division expressions. |
| Element | 11 | 集到单独转换表达式。Set-to-singleton conversion expressions. |
| EntityRef | 12 | 实体引用值检索表达式。Entity reference value retrieval expressions. |
| Equals | 13 | 相等表达式。Equality expressions. |
| Except | 14 | 集减法表达式。Set subtraction expressions. |
| Filter | 15 | 限制表达式。Restriction expressions. |
| FullOuterJoin | 16 | 完全外部联接表达式。Full outer join expressions. |
| Function | 17 | 独立函数表达式。Standalone function expressions. |
| GreaterThan | 18 | 大于表达式。Greater than expressions. |
| GreaterThanOrEquals | 19 | 大于或等于表达式。Greater than or equal expressions. |
| GroupBy | 20 | 分组表达式。Grouping expressions. |
| InnerJoin | 21 | 内部联接表达式。Inner join expressions. |
| Intersect | 22 | 交集表达式。Set intersection expressions. |
| IsEmpty | 23 | 空集确定表达式。Empty set determination expressions. |
| IsNull | 24 | Null 确定表达式。Null determination expressions. |
| IsOf | 25 | 类型比较（指定的类型或子类型）表达式。Type comparison (specified Type or Subtype) expressions. |
| IsOfOnly | 26 | 类型比较（仅限指定的类型）表达式。Type comparison (specified Type only) expressions. |
| Lambda | 57 | Lambda 函数表达式。Lambda function expressions. |
| LeftOuterJoin | 27 | 左外部联接表达式。Left outer join expressions. |
| LessThan | 28 | 小于表达式。Less than expressions. |
| LessThanOrEquals | 29 | 小于或等于表达式。Less than or equal expressions. |
| Like | 30 | 字符串比较表达式。String comparison expressions. |
| Limit | 31 | 结果计数限制 (TOP n)。Result count restriction (TOP n). |
| Minus | 32 | 减法表达式。Subtraction expressions. |
| Modulo | 33 | 取模表达式。Modulo expressions. |
| Multiply | 34 | 乘法表达式。Multiplication expressions. |
| NewInstance | 35 | 实例、行和集构造表达式。Instance, row, and set construction expressions. |
| Not | 36 | 逻辑非表达式。Logical NOT expressions. |
| NotEquals | 37 | 不等表达式。Inequality expressions. |
| Null | 38 | Null 表达式。Null expressions. |
| OfType | 39 | 按类型（或子类型）的集成员表达式。Set members by type (or subtype) expressions. |
| OfTypeOnly | 40 | 按确切类型的集成员表达式。Set members by exact type expressions. |
| Or | 41 | 逻辑或表达式。Logical OR expressions. |
| OuterApply | 42 | 外部应用表达式。Outer apply expressions. |
| ParameterReference | 43 | 引用参数表达式。Reference to a parameter expressions. |
| Plus | 44 | 加法表达式。Addition expressions. |
| Project | 45 | 投影表达式。Projection expressions. |
| Property | 46 | 静态或实例属性检索表达式。Static or instance property retrieval expressions. |
| Ref | 47 | 引用表达式。Reference expressions. |
| RefKey | 48 | 引用键值检索表达式。Ref key value retrieval expressions. |
| RelationshipNavigation | 49 | 关系（组合或关联）导航表达式。Relationship (composition or association) navigation expressions. |
| Scan | 50 | 实体集或关系集扫描表达式。Entity or relationship set scan expressions. |
| Skip | 51 | 跳过有序集合中的元素。Skip elements of an ordered collection. |
| Sort | 52 | 排序表达式。Sorting expressions. |
| Treat | 53 | 类型转换表达式。Type conversion expressions. |
| UnaryMinus | 54 | 求反表达式。Negation expressions. |
| UnionAll | 55 | 并集（包含重复项）表达式。Set union (with duplicates) expressions. |
| VariableReference | 56 | 引用变量表达式。Reference to a variable expressions. |
注解
使用 DbExpressionKind 枚举可指定不同类型的表达式。Use the DbExpressionKind enumeration to specify the various kinds of expressions. 成员表列出属于该类的成员的函数以及成员所指定的表达式类型。The Members table lists the functions that are members of this class and the type of expressions they specify.