string[] result = "1, a, 2, a, 3, a".Split(',')
.Select(s => s.Trim())
.Where(s => s != "a")
.ToArray();
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如果要比较不区分大小写:
string[] result = "1, a, 2, a, 3, a".Split(',')
.Select(s => s.Trim())
.Where(s => !"a".Equals(s, StringComparison.OrdinalIgnoreCase))
.ToArray();
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