EF Unit Of Work

地位

分支	建造	部署
掌握
發展		N/A。

這是什麼？

實體框架核心3的存儲庫和工作模式實施單位。

如何使用？

安裝

安裝Nuget軟件包。將抽像用於邏輯層，另一個用於基礎結構層或整體項目。

dotnet add package QD.EntityFrameworkCore.UnitOfWork
dotnet add package QD.EntityFrameworkCore.UnitOfWork.Abstractions

登記服務

 public class AppDbContext : DbContext , IDbContext
{
    public DbSet < Product > Products { get ; set ; }

    public AppDbContext ( DbContextOptions < AppDbContext > options ) : base ( options )
    {
    }

    .. .
    .. .
} 

 public void ConfigureServices ( IServiceCollection services )
{
    services . AddDbContext < AppDbContext > ( builder =>
    {
        .. .
    } ) ;

#region Register UnitOfWorks
    // Register a IUnitOfWork<AppDbContext>
    _services . AddUnitOfWork < AppDbContext > ( ) ;
    // Register a IUnitOfWork<AppDbContext> and IUnitOfWork
    _services . AddUnitOfWork < AppDbContext > ( onlyGeneric : false ) ;
#endregion

    // Optional, register custom repositories
    _services . AddRepository < Product , ProductRepository > ( ) ;
    _services . AddReadOnlyRepository < Product , ProductReadOnlyRepository > ( ) ;
} 

使用服務

 public class FancyService : IFancyService
{
    private readonly IUnitOfWork < AppDbContext > _unitOfWork ;

    public FancyService ( IUnitOfWork < AppDbContext > unitOfWork )
    {
        _unitOfWork = unitOfWork ;
    }

    public void DoFancyThing ( )
    {
        var productsRepository = _unitOfWork . GetRepository < Product > ( ) ;

        var products = productsRepository . GetAll ( ) ;

        .. .
        // Use inserts, updates, deletes.
        .. .

        _unitOfWork . SaveChanges ( ) ;
    }
} 

分頁收藏（v2.0）

 public void FancyFunction ( )
{
    // These are some examples

    // Array
    IPagedCollection < Product > page1 = _productsRepository . GetPagedArray ( 20 , 0 , product => product . Price > 500 ) ;
    IPagedCollection < Product > page2 = await _productsRepository . GetPagedArrayAsync (
        pageSize : 10 ,
        orderBy : query => query . OrderBy ( product => product . Price ) . ThenBy ( product => product . Name )
    ) ;
    // Indexers
    var a = page1 [ 1 ] . Price ;
    var b = ( ( PagedArray < Product > ) page1 ) [ 2 ] . Price ;

    .. .

    // List
    IPagedCollection < Product > page1 = _productsRepository . GetPagedList ( 20 , 0 , product => product . Price > 500 ) ;
    IPagedCollection < Product > page2 = await _productsRepository . GetPagedListAsync (
        pageSize : 10 ,
        orderBy : query => query . OrderBy ( product => product . Price ) . ThenBy ( product => product . Name )
    ) ;
    // Indexers
    var a = page1 [ 1 ] . Price ;
    var b = ( ( PagedList < Product > ) page1 ) [ 2 ] . Price ;

    .. .

    // Dictionary
    IPagedCollection < KeyValuePair < Guid , Product > > page1 = _productsRepository . GetPagedDictionary ( product => product . Id , 20 , 0 , product => product . Price > 500 ) ;
    IPagedCollection < KeyValuePair < Guid , Product > > page2 = await _productsRepository . GetPagedDictionaryAsync (
        keySelector : product => product . Id ,
        pageSize : 10 ,
        orderBy : query => query . OrderBy ( product => product . Price ) . ThenBy ( product => product . Name )
    ) ;
    // Indexers
    var a = page1 [ 1 ] . Value . Price ;
    var b = ( ( PagedDictionary < Guid , Product > ) page1 ) [ Guid . Parse ( "5926d548-c0b3-4c40-b37f-e89be7741024" ) ] . Price ;
}

以前的方法相同

    GetAll ( predicate , orderBy ) . ToPagedArray ( pageSize , pageNumber ) ;
    GetAll ( predicate , orderBy ) . ToPagedListAsync ( pageSize , pageNumber ) ;
    GetAll ( predicate , orderBy ) . ToPagedDictionary ( keySelector , pageSize , pageNumber ) ;