求字典遍历，有些忘了,该如何解决

求字典遍历，有些忘了
例如我写一个这样的字典

C# code

Dictionary<int, int> dic = new Dictionary<int, int> { { 1, -1 }, { 2, -1 }, { 3, -1 }, { 4, 2 }, { 5, 2 },             { 6, 5 }, { 7, 1 }, { 8, 2 }, { 9, 1 }, { 10, 7 }};

C# code

            var q = dic                .Where(x => x.Value == -1)                .OrderBy(x => x.Key)                .Select(x => x.Key)                .ToList();            Assert.AreEqual(1, q[0]);            Assert.AreEqual(2, q[1]);            Assert.AreEqual(3, q[2]);
[解决办法]
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C# code
            var q = dic
                .Where(x => x.Value == -1)
                .OrderBy(x => x.Key)
                .Select(x => x.Key)
                .ToList();
            Assert.AreE……