Deferred Execution of Query
When we write any LINQ query as mentioned, it doesn't get executed immediately. It actually stores query in the variable and every time we use/enumerate the variable it executes the query and use the result. It is called deferred execution.
So that whenever filter variable(a) changes prior to the use of object(lStr), output will automatically changes.
class Sample { public int i; public String str; } static void Main(string[] args) { Listlst = new List (); lst.Add(new Sample() { i = 1, str = "String1" }); lst.Add(new Sample() { i = 2, str = "String2" }); lst.Add(new Sample() { i = 3, str = "String3" }); lst.Add(new Sample() { i = 4, str = "String4" }); int a = 1; IEnumerable lStr = (from l in lst where l.i == a select l); //It will just store query in lStr variable. }
When we write any LINQ query as mentioned, it doesn't get executed immediately. It actually stores query in the variable and every time we use/enumerate the variable it executes the query and use the result. It is called deferred execution.
Sample s = lStr.First(); ///Query will be executed here Console.WriteLine(s.str);
So that whenever filter variable(a) changes prior to the use of object(lStr), output will automatically changes.
IEnumerablelStr = (from l in lst where l.i == a select l); Sample s = lStr.First (); //will execute query. Console.WriteLine(s.str); //Output: String1 a = 2; s = lStr.First (); //will execute the query again Console.WriteLine(s.str); //Output: String2.
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