DbAggregate 类
定义
实现 GroupBy 子句中的聚合所需的基本功能。Implements the basic functionality required by aggregates in a GroupBy clause.
public ref class DbAggregate abstract
public abstract class DbAggregate
type DbAggregate = class
Public MustInherit Class DbAggregate
- 继承
-
DbAggregate
- 派生
注解
聚合是伪表达式,其可以出现的位置有严格的限制。Aggregates are pseudo-expressions, and are severely restricted in where they can appear. 聚合只能出现在表达式的聚合子句中 GroupBy 。Aggregates can only appear in the aggregates clause of a GroupBy expression.
属性
| Arguments |
获取对此 DbAggregate 定义参数的表达式列表。Gets the list of expressions that define the arguments to this DbAggregate. |
| ResultType |
获取此 DbAggregate 的结果类型。Gets the result type of this DbAggregate. |
方法
| Equals(Object) |
确定指定对象是否等于当前对象。Determines whether the specified object is equal to the current object. (继承自 Object) |
| GetHashCode() |
作为默认哈希函数。Serves as the default hash function. (继承自 Object) |
| GetType() |
获取当前实例的 Type。Gets the Type of the current instance. (继承自 Object) |
| MemberwiseClone() |
创建当前 Object 的浅表副本。Creates a shallow copy of the current Object. (继承自 Object) |
| ToString() |
返回表示当前对象的字符串。Returns a string that represents the current object. (继承自 Object) |
扩展方法
| As(DbAggregate, String) |
返回作为键/值对象指的定参数。Returns the specified arguments as a key/value pair object. |