C# 程式設計/關鍵字/where

關鍵字where有兩個不同的含義

1. 它用於指定對泛型型別引數的一個或多個約束。
2. 使用LINQ，它用於查詢資料來源並選擇或過濾要返回的元素。

C# 關鍵字
abstract as base bool break byte case catch char checked class const continue decimal default delegate do double else enum event explicit extern false finally fixed float for foreach goto if implicit in int interface internal is lock long namespace new null object operator out override params private protected public readonly ref return sbyte sealed short sizeof stackalloc static string struct switch this throw true try typeof uint ulong unchecked unsafe ushort using var virtual void volatile while
C# 特殊識別符號（上下文關鍵字）
add alias async await dynamic get global nameof partial remove set value when where yield
上下文關鍵字（在查詢中使用）
ascending by descending equals from group in into join let on orderby select where