删除时EF5代码第一级联
本文关键字:级联 代码 EF5 删除 | 更新日期: 2023-09-27 17:58:16
当我删除计算机时,有什么方法可以实现级联删除吗?基本上,当我删除一台计算机时,我希望它删除该实例及其除环境和产品之外的所有引用。
计算机实体:
public class Computer
{
[Key]
public int Id { get; set; }
public string IpAddress { get; set; }
public string Name { get; set; }
public string UserFriendlyName { get; set; }
public string Description { get; set; }
}
实例实体:
public class Instance
{
public Instance()
{
TestResults = new HashSet<TestResult>();
Environments = new HashSet<Environment>();
}
[Key]
public int Id { get; set; }
public string Name { get; set; }
public string Version { get; set; }
public string UserFriendlyName { get; set; }
public virtual Product Product { get; set; }
public virtual Profile LastKnownProfile { get; set; }
public virtual Computer Computer { get; set; }
public virtual ICollection<TestResult> TestResults { get; set; }
public virtual ICollection<Environment> Environments { get; set; }
}
您需要使用Fluent API定义关系。使用类似的东西:
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Computer>()
.HasRequired(x => x.Instance)
.WithRequiredPrincipal(x => x.Computer)
.WillCascadeOnDelete();
modelBuilder.Entity<Instance>()
.HasRequired(x => x.LastKnownProfile)
.WithRequiredPrincipal(x => x.Instance)
.WillCascadeOnDelete();
modelBuilder.Entity<Instance>()
.HasMany(x => x.TestResults)
.WithOptional(x => x.Instance)
.WillCascadeOnDelete();
}
这在MSDN上有很好的记录:使用Fluent API 配置关系
检查多对多关系。关闭状态的级联删除并手动删除相关记录。