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= null) { pageIndex = 1; } else { searchString = currentFilter; } CurrentFilter = searchString; IQueryable<Student> studentsIQ = from s in _context.Students select s; if (!String.IsNullOrEmpty(searchString)) { studentsIQ = studentsIQ.Where(s => s.LastName.Contains(searchString) || s...
using System; using System.Collections.Generic; namespace ContosoUniversity.Models { public class Student { public int ID { get; set; } public string LastName { get; set; } public string FirstMidName { get; set; } public DateTime EnrollmentDate { get; set; } public ICollection<Enrollment>...
StudentConfig: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 builder.ToTable("T_Students"); builder.HasMany<Teacher>(s => s.Teachers).WithMany(t=>t.Students).UsingEntity(j=>j.ToTable("T_Students_Teachers")); //执行迁移后,会自动生成T_Students_Teachers中间表 基于关系的复杂查询 查询...
Singleton:整个应用程序生命周期内只创建一个实例 *///services.AddScoped<IRepository<Student>, InMemoryRepository>();services.AddSingleton<IRepository<Student>, InMemoryRepository>(); services.AddMvc(); }// This method gets called by the runtime. Use this method to configure the HTTP request pipe...
DbSet实现了IEnumerable<T>接口,因此可以对DbSet实施Linq操作来进行数据查询。EF Core会把Linq操作转换为SQL语句。面向对象,而不是面向数据库(SQL)。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 IQueryable<Book>books=dbContext.Books.Where(b=>b.Price>20);foreach(Book bookinbooks){Console.WriteLine...
2)我们将使用此DbSet<Student>属性,Students来查询和保存类文件Student的实例。 3)当对DbSet采用Linq查询的时候,它会自动转换为SQL语句来对基础数据库做查询操作。 P52 48在Entity Framework Core中使用Sql server P53 49ASP.NET Core中的仓储模式 P54 50Entity Framwork Core迁移功能 ...
{var std =newStudent(){ StudentName ="Steve" }; context.Add(std); context.SaveChanges(); Console.ReadLine(); } The above example will display the following logs on the console: dbug: Microsoft.EntityFrameworkCore.Infrastructure[100401] ...
public class Student : Person { ... } context.Students.AddRange(entities); //adding to Context so Shadow property 'Discriminator' gets set context.BulkInsert(entities);TPT (Table-Per-Type) way it is supported.Structure of SourceCodeAction Flow _CLASSES: |DbContextBulk|SqlBulk |ISqlOperations...
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