如何将IEnumerable转换为一个对象

Question

在我的应用程序中，用户可以具有多个角色，我想将角色列表转换为一个通用角色对象以申请许可

我如何处理将List转换为Common角色？

public class Role
    {
        public boolData ListBools { get; set; }
        public ListId ListIds { get; set; }
    }
    public class boolData
    {
        public bool CanSale { get; set; }
        public bool CanBuy { get; set; }
    }

    public class ListId
    {
        public IEnumerable<Int64> Product { get; set; }
        public IEnumerable<Int64> Formula { get; set; }
    }

例如，此用户有两个我要行使的角色，这些角色是一个角色对象共有的

 IEnumerable<Role> UserRoles = new List<Role>()
            {
                new Role(){ListBools = new boolData()
                    {
                        CanBuy = false,
                        CanSale = true
                    },
                    ListIds = new ListId()
                    {
                        Product = new List<long>(){1,4,58},
                        Formula = new List<long>(){2,7,}
                    }
                },
                new Role(){ListBools = new boolData()
                    {
                        CanBuy = true,
                        CanSale = true
                    },
                    ListIds = new ListId()
                    {
                        Product = new List<long>(){1,6,70},
                        Formula = new List<long>(){2,9,}
                    }
                },
            };

必须转换为

Role Result = new Role()
            {
                ListBools = new boolData()
                {
                    CanBuy = true,
                    CanSale = true
                },
                ListIds = new ListId()
                {
                    Product = new List<long>() { 1, 4, 6, 58, 70 },
                    Formula = new List<long>() { 2, 7, 9, }

                }
            };

Answer 1

您可以使用Linq的Any和SelectMany()组合，

喜欢，

    var Result = new Role()
    {
        ListBools = new boolData()
        {
            CanBuy = UserRoles.Any(x => x.ListBools.CanBuy),
            CanSale = UserRoles.Any(x => x.ListBools.CanSale)
        },
        ListIds = new ListId()
        {
            Product = UserRoles.SelectMany(x => x.ListIds.Product).Distinct(),
            Formula = UserRoles.SelectMany(x => x.ListIds.Formula).Distinct()
        }
    };

Answer 2

有关公式和产品的列表，可以使用SelectMany + Distinct：

  Role sum = new Role
        {
            ListBools = new boolData()
            {
                CanBuy = true,
                CanSale = true
            },
            ListIds = new ListId
            {
                Formula = UserRoles.SelectMany(x => x.ListIds.Formula).Distinct().ToList(),
                Product = UserRoles.SelectMany(x => x.ListIds.Product).Distinct().ToList()
            }
        };

我不知道如何生产ListBools ....也许您应该将所有规则分组并按boolData加入Formula / Product

Answer 3

您可以使用以下代码：

• SelectMany将许多产品/配方列表合并为一个
• 区别删除重复项
• OrderBy确保升序
• 任何检查是否至少一个CanBuy / CanSale属性为true

顺便说一句-我同意以下说法，即“类别/属性”名称可以是

    var products = UserRoles.SelectMany(m => m.ListIds.Product).Distinct().OrderBy(m => m).ToList();
    var formulas = UserRoles.SelectMany(m => m.ListIds.Formula).Distinct().OrderBy(m => m).ToList();
    var anyCanBuy = UserRoles.Any(m => m.ListBools.CanBuy);
    var anyCanSale = UserRoles.Any(m => m.ListBools.CanSale);

    Role Result = new Role()
    {
        ListBools = new boolData()
        {
            CanBuy = anyCanBuy,
            CanSale = anyCanSale,
        },
        ListIds = new ListId()
        {
            Product = products,
            Formula = formulas,
        }
    };