ASP.NET MVC 是一种基于模型-视图-控制器(Model-View-Controller,MVC)架构的Web应用程序开发框架。它通过将应用程序分为模型(Model)、视图(View)和控制器(Controller)三个组件,实现了应用程序的分层和解耦,提高了代码的可维护性和可测试性。
在ASP.NET MVC中,如果需要实现级联删除,可以通过以下步骤进行手动添加:
以下是一个示例代码,演示如何手动将“级联删除”添加到ASP.NET MVC中的代码优先关系:
public class Category
{
public int CategoryId { get; set; }
public string Name { get; set; }
public virtual ICollection<Product> Products { get; set; }
}
public class Product
{
public int ProductId { get; set; }
public string Name { get; set; }
public int CategoryId { get; set; }
public virtual Category Category { get; set; }
}
public class ApplicationDbContext : DbContext
{
public DbSet<Category> Categories { get; set; }
public DbSet<Product> Products { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Product>()
.HasRequired(p => p.Category)
.WithMany(c => c.Products)
.HasForeignKey(p => p.CategoryId)
.WillCascadeOnDelete(true); // 启用级联删除
}
}
public class CategoryController : Controller
{
private ApplicationDbContext db = new ApplicationDbContext();
// GET: Category/Delete/5
public ActionResult Delete(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
Category category = db.Categories.Find(id);
if (category == null)
{
return HttpNotFound();
}
return View(category);
}
// POST: Category/Delete/5
[HttpPost, ActionName("Delete")]
[ValidateAntiForgeryToken]
public ActionResult DeleteConfirmed(int id)
{
Category category = db.Categories.Find(id);
db.Categories.Remove(category);
db.SaveChanges();
return RedirectToAction("Index");
}
}
@model Category
@using (Html.BeginForm("Delete", "Category", new { id = Model.CategoryId }, FormMethod.Post, new { @class = "form-horizontal", role = "form" }))
{
@Html.AntiForgeryToken()
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<h4>确定要删除该分类吗?</h4>
<input type="submit" value="删除" class="btn btn-danger" />
@Html.ActionLink("返回列表", "Index", null, new { @class = "btn btn-default" })
</div>
</div>
}
通过以上步骤,我们可以手动将“级联删除”添加到ASP.NET MVC中的代码优先关系中。在删除主表数据时,相关的从表数据也会被自动删除,实现了级联删除的效果。
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