Question

根据asp.net上的this tutorial，它会显示以下代码：

using System;
using ContosoUniversity.Models;

namespace ContosoUniversity.DAL
{
    public class UnitOfWork : IDisposable
    {
        private SchoolContext context = new SchoolContext();
        private GenericRepository<Department> departmentRepository;
        private GenericRepository<Course> courseRepository;

        public GenericRepository<Department> DepartmentRepository
        {
            get
            {

                if (this.departmentRepository == null)
                {
                    this.departmentRepository = new GenericRepository<Department>(context);
                }
                return departmentRepository;
            }
        }

        public GenericRepository<Course> CourseRepository
        {
            get
            {

                if (this.courseRepository == null)
                {
                    this.courseRepository = new GenericRepository<Course>(context);
                }
                return courseRepository;
            }
        }

        public void Save()
        {
            context.SaveChanges();
        }

        private bool disposed = false;

        protected virtual void Dispose(bool disposing)
        {
            if (!this.disposed)
            {
                if (disposing)
                {
                    context.Dispose();
                }
            }
            this.disposed = true;
        }

        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }
    }
}

每次要添加新数据库表时是否必须编写代码？例如，如果我想添加一个StudentsRepository，我就必须这样做（？）：

private GenericRepository<Student> studentRepository;

public GenericRepository<Student> StudentRepository
{
    get
    {

        if (this.studentRepository == null)
        {
            this.studentRepository = new GenericRepository<Student>(context);
        }
        return studentRepository;
    }
}

如果我的数据库有50个表怎么办？我是否必须为所有50个人编写此代码！？

Answer 1

您的问题的答案是“是”，工作单元应包含访问所有可能存储库的属性。

如果您无法编写代码，请创建一个T4模板并自动生成该类。

实现存储库模式

1 个答案: