1.Enumerable.Concat<(Of <(TSource>)>) 泛型方法应用
此方法是延迟执行的。此方法只返回输入序列中的所有原始元素
应用场景:只有通过直接调用对象的 GetEnumerator 方法来枚举该对象时,才执行此方法表示的查询。
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2.QueryableConcat<(Of <(TSource>)>) 泛型方法应用
此方法生成 MethodCallExpression,其实方法本身即作为了构造的泛型方法。
然后,将 MethodCallExpression 传递给 IQueryProvider 的 CreateQuery方法,由 source1 参数的 Provider 属性表示。其实说白了,就是将 source2 中的元素连接到 source1 中的元素以组合成一个新的序列。
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以下是一个完整的DEMO
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LINQ Coding 目录