C# linq 和多语言数据库

Question

在我的应用程序中有一个多语言数据库。有必要从数据库中加载用户程序中设置的语言的列表。我使用 Dbling 库，现在 3 天都在摸不着头脑，如何动态地从数据库中获取数据，构建 linq 请求。以下 table 标识以下列：

编号 | name_en | name_ru

假设默认语言是俄语。然后在初始化应用的时候，需要把所有的信息都用俄语取

DbMetal utility created my class:

    // 
    //  ____  _     __  __      _        _ 
    // |  _ \| |__ |  \/  | ___| |_ __ _| |
    // | | | | '_ \| |\/| |/ _ \ __/ _` | |
    // | |_| | |_) | |  | |  __/ || (_| | |
    // |____/|_.__/|_|  |_|\___|\__\__,_|_|
    //
    // Auto-generated from main on 2016-09-30 22:24:51Z.
    // Please visit http://code.google.com/p/dblinq2007/ for more information.
    //
    using System;
    using System.ComponentModel;
    using System.Data;
    #if MONO_STRICT
        using System.Data.Linq;
    #else   // MONO_STRICT
        using DbLinq.Data.Linq;
        using DbLinq.Vendor;
    #endif  // MONO_STRICT
        using System.Data.Linq.Mapping;
    using System.Diagnostics;

    namespace MMS.Model.Test
    {
        public partial class Main : DataContext
        {

            #region Extensibility Method Declarations
            partial void OnCreated();
            #endregion

            partial void OnCreated()
            {

            }
            public Main(string connectionString) :
                base(connectionString)
            {
                this.OnCreated();
            }

            public Main(string connection, MappingSource mappingSource) :
                base(connection, mappingSource)
            {
                this.OnCreated();
            }

            public Main(IDbConnection connection, MappingSource mappingSource) :
                base(connection, mappingSource)
            {
                this.OnCreated();
            }
    public Table<ListLips> ListLips
            {
                get
                {
                    return this.GetTable<ListLips>();
                }
            }
[Table(Name = "main.list_lips")]
    public partial class ListLips : System.ComponentModel.INotifyPropertyChanging, System.ComponentModel.INotifyPropertyChanged
    {

        private static System.ComponentModel.PropertyChangingEventArgs emptyChangingEventArgs = new System.ComponentModel.PropertyChangingEventArgs("");

        private int _id;

        private string _nameRu;

        private string _nameEn;

        #region Extensibility Method Declarations
        partial void OnCreated();

        partial void OnIDChanged();

        partial void OnIDChanging(int value);

        partial void OnNameRuChanged();

        partial void OnNameRuChanging(string value);

        partial void OnNameENChanged();

        partial void OnNameENChanging(string value);
        #endregion


        public ListLips()
        {
            this.OnCreated();
        }

        [Column(Storage = "_id", Name = "id", DbType = "INTEGER", IsPrimaryKey = true, IsDbGenerated = true, AutoSync = AutoSync.Never, CanBeNull = false)]
        [DebuggerNonUserCode()]
        public int ID
        {
            get
            {
                return this._id;
            }
            set
            {
                if ((_id != value))
                {
                    this.OnIDChanging(value);
                    this.SendPropertyChanging();
                    this._id = value;
                    this.SendPropertyChanged("ID");
                    this.OnIDChanged();
                }
            }
        }

        [Column(Storage = "_nameRu", Name = "name_ru", DbType = "VARCHAR (30)", AutoSync = AutoSync.Never)]
        [DebuggerNonUserCode()]
        public string NameRu
        {
            get
            {
                return this._nameRu;
            }
            set
            {
                if (((_nameRu == value)
                            == false))
                {
                    this.OnNameRuChanging(value);
                    this.SendPropertyChanging();
                    this._nameRu = value;
                    this.SendPropertyChanged("NameRu");
                    this.OnNameRuChanged();
                }
            }
        }

        [Column(Storage = "_nameEn", Name = "name_en", DbType = "VARCHAR (30)", AutoSync = AutoSync.Never)]
        [DebuggerNonUserCode()]
        public string NameEN
        {
            get
            {
                return this._nameEn;
            }
            set
            {
                if (((_nameEn == value)
                            == false))
                {
                    this.OnNameENChanging(value);
                    this.SendPropertyChanging();
                    this._nameEn = value;
                    this.SendPropertyChanged("NameEN");
                    this.OnNameENChanged();
                }
            }
        }

        public event System.ComponentModel.PropertyChangingEventHandler PropertyChanging;

        public event System.ComponentModel.PropertyChangedEventHandler PropertyChanged;

        protected virtual void SendPropertyChanging()
        {
            System.ComponentModel.PropertyChangingEventHandler h = this.PropertyChanging;
            if ((h != null))
            {
                h(this, emptyChangingEventArgs);
            }
        }

        protected virtual void SendPropertyChanged(string propertyName)
        {
            System.ComponentModel.PropertyChangedEventHandler h = this.PropertyChanged;
            if ((h != null))
            {
                h(this, new System.ComponentModel.PropertyChangedEventArgs(propertyName));
            }
        }
    }
       }
}

此外，我创建了一个 POCO class，它将存储数据：

public class ListRegistered
    {
        private int _id;
        private string _name;

        public ListRegistered()
        {

        }

        public int ID
        {
            get { return this._id; }
            set { this._id = value; }
        }

        public string Name
        {
            get { return this._name; }
            set { this._name = value; }
        }
    }

现在我提出要求：

public class PersonInformationModel 
    {

        private static string language = "ru" // We assume that this is the current language;


        public List<MMS.Model.POCO.ListRegistered> GetRegisteredList()
        {
            Main dbContext = new Main(DatabaseConnect.GetConnectionContext(), new SqliteVendor());

var q = (from o in dbContext.ListRegistered select new MMS.Model.POCO.ListRegistered() {
     Name = // <------- How do I get here to dynamically o.NameRu or o.NameEn???
});
}
}

Answer 1

只有当你有一个 table 用于翻译而不是每种语言 1 列（这是非常不可扩展的，稍后会回来伤害你）时，在 LINQ 中才容易做到。

在你的情况下，你能做的最好的事情是在你的 Poco 中为名称添加一个属性，并使用一个 getter 来执行该逻辑（即 returns 中的正确列根据您想要的语言进行切换）。无法神奇地 select a "column"

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