LINQ的意外输出何时按Contains(变量)过滤

您被捕获的变量咬了一口:

var query = color.Where(c => c.Contains(s));

升降机s成闭合,并且读取的值s 在执行时.在这种情况下,这会在您重新分配s给其他内容后发生.

你最终得到的是你的查询:

var query = color.Where(c => c.Contains(s)).Where(c => c.Contains(s));

而不是你可能期望的:

var query = color.Where(c => c.Contains("g")).Where(c => c.Contains("a"));

这将产生您期望的结果:

string s = "g";
string[] color = { "greena", "browna", "bluea" };
var query = color.Where(c => c.Contains(s));
Console.WriteLine(query.Count());
var b = "a";
query = query.Where(c => c.Contains(b));
Console.WriteLine(query.Count()); // <-- This is where the entire expression is evaluated