数据库唯一键 [Column(Unique = “uk_xxxx")]

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class AddUniquesInfo {

    public Guid id { get; set; }
    [Column(Unique = "uk_phone")]
    public string phone { get; set; }

    [Column(Unique = "uk_group_index")]
    public string group { get; set; }
    [Column(Unique = "uk_group_index")]
    public int index { get; set; }

    [Column(Unique = "uk_group_index222")]
    public string index22 { get; set; }
}

Unique 指定相同的标识，代表联合唯一键；

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更多资料：https://github.com/2881099/FreeSql/wiki/CodeFirst

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方式已改，详细见文档