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int[] a = { 1, 2, 3 };
string s = string.Join(",", a);
Console.WriteLine(s);
//测试数据
User[] u = new User[]{
new User(){id=1,name="1"},
new User(){id=1,name="2"},
new User(){id=1,name="3"},
};
//提取处理字段
var q = u.Select(x => x.name).ToArray();
var result = string.Join(",", q);
Console.WriteLine(result);