C# 使用数据库拦截器的实体框架软删除实现不工作
我已经使用以下教程实现了数据库软删除(将条目标记为已删除的布尔标志): 在我看来,这是一个非常好的实现,因为一旦设置了软删除,只需添加C# 使用数据库拦截器的实体框架软删除实现不工作,c#,asp.net,database,entity-framework,soft-delete,C#,Asp.net,Database,Entity Framework,Soft Delete,我已经使用以下教程实现了数据库软删除(将条目标记为已删除的布尔标志): 在我看来,这是一个非常好的实现,因为一旦设置了软删除,只需添加[SoftDelete(“IsDeleted”)]注释即可将其应用于模型。问题是到目前为止它还不起作用 消息来源似乎可靠,他们甚至发布了一个解决方案示例: 你能看看我的代码,以防我在将软删除应用到我的项目时出错吗 这就是模型: [SoftDelete("IsDeleted")] public class BC_Instance { public int I
[SoftDelete(“IsDeleted”)]
注释即可将其应用于模型。问题是到目前为止它还不起作用
消息来源似乎可靠,他们甚至发布了一个解决方案示例:
你能看看我的代码,以防我在将软删除应用到我的项目时出错吗
这就是模型:
[SoftDelete("IsDeleted")]
public class BC_Instance
{
public int ID { get; set; }
public bool IsDeleted { get; set; }
}
ApplicationDbContext.cs:
namespace bcplatform2.Models
{
public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
public ApplicationDbContext()
: base("DefaultConnection", throwIfV1Schema: false)
{
}
// Add a DbSet for each one of your Entities
//public DbSet<VirtualGuest> VirtualGuests { get; set; }
public DbSet<BC_Instance> BiocloudInstances { get; set; }
static ApplicationDbContext()
{
Database.SetInitializer<ApplicationDbContext>(new ApplicationDbInitializer());
}
public static ApplicationDbContext Create()
{
return new ApplicationDbContext();
}
protected new void OnModelCreating(DbModelBuilder modelBuilder)
{
var conv = new AttributeToTableAnnotationConvention<SoftDeleteAttribute, string>(
"SoftDeleteColumnName",
(type, attributes) => attributes.Single().ColumnName);
modelBuilder.Conventions.Add(conv);
}
}
}
protected new void OnModelCreating(DbModelBuilder modelBuilder) {...}
SoftDeleteAttribute.cs:
namespace bcplatform2.Helpers
{
public class SoftDeleteAttribute : Attribute
{
public SoftDeleteAttribute(string column)
{
ColumnName = column;
}
public string ColumnName { get; set; }
public static string GetSoftDeleteColumnName(EdmType type)
{
MetadataProperty annotation = type.MetadataProperties
.Where(p => p.Name.EndsWith("customannotation:SoftDeleteColumnName"))
.SingleOrDefault();
return annotation == null ? null : (string)annotation.Value;
}
}
}
SoftDeleteInterceptor.cs
我注意到SoftDeleteAttribute.GetSoftDeleteColumnName(deleteCommand.Target.VariableType.EdmType)
找不到SoftDelete属性并返回null。但我不知道为什么。
namespace bcplatform2.Helpers
{
public class SoftDeleteInterceptor : IDbCommandTreeInterceptor
{
public void TreeCreated(DbCommandTreeInterceptionContext interceptionContext)
{
if (interceptionContext.OriginalResult.DataSpace == DataSpace.SSpace)
{
var queryCommand = interceptionContext.Result as DbQueryCommandTree;
if (queryCommand != null)
{
var newQuery = queryCommand.Query.Accept(new SoftDeleteQueryVisitor());
interceptionContext.Result = new DbQueryCommandTree(
queryCommand.MetadataWorkspace,
queryCommand.DataSpace,
newQuery);
}
var deleteCommand = interceptionContext.OriginalResult as DbDeleteCommandTree;
if (deleteCommand != null)
{
var column = SoftDeleteAttribute.GetSoftDeleteColumnName(deleteCommand.Target.VariableType.EdmType);
if (column != null)
{
var setClauses = new List<DbModificationClause>();
var table = (EntityType)deleteCommand.Target.VariableType.EdmType;
if (table.Properties.Any(p => p.Name == column))
{
setClauses.Add(DbExpressionBuilder.SetClause(
DbExpressionBuilder.Property(
DbExpressionBuilder.Variable(deleteCommand.Target.VariableType, deleteCommand.Target.VariableName),
column),
DbExpression.FromBoolean(true)));
}
var update = new DbUpdateCommandTree(
deleteCommand.MetadataWorkspace,
deleteCommand.DataSpace,
deleteCommand.Target,
deleteCommand.Predicate,
setClauses.AsReadOnly(),
null);
interceptionContext.Result = update;
}
}
}
}
}
}
namespace bcplatform2.Helpers
{
公共类SoftDeleteInterceptor:IDbCommandTreeInterceptor
{
已创建公共无效树(DbCommandTreeInterceptionContext interceptionContext)
{
if(interceptionContext.OriginalResult.DataSpace==DataSpace.SSpace)
{
var queryCommand=interceptionContext.Result为DbQueryCommandTree;
if(queryCommand!=null)
{
var newQuery=queryCommand.Query.Accept(新的SoftDeleteQueryVisitor());
Result=new DbQueryCommandTree(
queryCommand.MetadataWorkspace,
queryCommand.DataSpace,
新查询);
}
var deleteCommand=interceptionContext.OriginalResult作为DbDeleteCommandTree;
if(deleteCommand!=null)
{
var column=SoftDeleteAttribute.GetSoftDeleteColumnName(deleteCommand.Target.VariableType.EdmType);
if(列!=null)
{
var setClaires=新列表();
变量表=(EntityType)deleteCommand.Target.VariableType.EdmType;
if(table.Properties.Any(p=>p.Name==column))
{
添加(DbExpressionBuilder.SetClause(
DbExpressionBuilder.Property(
DbExpressionBuilder.Variable(deleteCommand.Target.VariableType,deleteCommand.Target.VariableName),
柱),
DbExpression.FromBoolean(true));
}
var update=new DbUpdateCommandTree(
deleteCommand.MetadataWorkspace,
deleteCommand.DataSpace,
deleteCommand.Target,
deleteCommand.Predicate,
setClaires.AsReadOnly(),
无效);
Result=update;
}
}
}
}
}
}
IdentityConfig.cs
public class ApplicationDbInitializer : DropCreateDatabaseIfModelChanges<ApplicationDbContext>
{
protected override void Seed(ApplicationDbContext context)
{
InitializeIdentityForEF(context);
base.Seed(context);
}
//Create User=Admin@Admin.com with password=Admin@123456 in the Admin role
public static void InitializeIdentityForEF(ApplicationDbContext db)
{
//Initialize users and roles...
}
}
公共类应用程序BinInitializer:DropCreateDatabaseIfModelChanges
{
受保护的重写无效种子(ApplicationDbContext上下文)
{
InitializeIdentityFore(上下文);
种子(上下文);
}
//创建用户=Admin@Admin.com带密码=Admin@123456在管理员角色中
公共静态void initializedEntityForef(ApplicationDbContext数据库)
{
//初始化用户和角色。。。
}
}
我觉得你的代码很好。也许有一个小小的错误正在破坏你的应用程序。你可以试试这个:
BC\u实例
OnModelCreating
方法
AttributeToTableAnnotationConvention<SoftDeleteAttribute, string> conv =
new AttributeToTableAnnotationConvention<SoftDeleteAttribute, string>(
"SoftDeleteColumnName",
(type, attributes) => attributes.Single().ColumnName);
modelBuilder.Conventions.Add(conv);
//this will dynamically add the attribute to all models
modelBuilder.Types().Configure(delegate(ConventionTypeConfiguration i)
{
i.HasTableAnnotation("SoftDeleteColumnName", Entity.G etSoftDeleteColumnName());
});
希望这有帮助 ApplicationDbContext.cs中有一个错误:
namespace bcplatform2.Models
{
public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
public ApplicationDbContext()
: base("DefaultConnection", throwIfV1Schema: false)
{
}
// Add a DbSet for each one of your Entities
//public DbSet<VirtualGuest> VirtualGuests { get; set; }
public DbSet<BC_Instance> BiocloudInstances { get; set; }
static ApplicationDbContext()
{
Database.SetInitializer<ApplicationDbContext>(new ApplicationDbInitializer());
}
public static ApplicationDbContext Create()
{
return new ApplicationDbContext();
}
protected new void OnModelCreating(DbModelBuilder modelBuilder)
{
var conv = new AttributeToTableAnnotationConvention<SoftDeleteAttribute, string>(
"SoftDeleteColumnName",
(type, attributes) => attributes.Single().ColumnName);
modelBuilder.Conventions.Add(conv);
}
}
}
protected new void OnModelCreating(DbModelBuilder modelBuilder) {...}
您使用的是“new”而不是“override”,因此永远不会执行OnModelCreating(尝试添加断点以检查它)。因此,AttributeToTableAnnotationConvention永远不会运行,也永远不会添加实体注释
改成
protected override void OnModelCreating(DbModelBuilder modelBuilder) {...}
会成功的谢谢你的帮助。一个问题:在'i.HasTableAnnotation(“SoftDeleteColumnName”,Entity.GetSoftDeleteColumnName())行中,`->
当前上下文中不存在名称实体
。此外,我应该如何检查它是否有效。如果我直接查询数据库,我应该会看到删除记录,对吗?拦截器只应用于代码?在我的例子中,Entity是ModelStack继承的基类。看看@tede24的答案,这可能是正确的!如果重写,则不会调用原始的OnModelCreating,情况不应该是这样<另一方面,code>new使这两种方法都被调用。这是不正确的。您应该重写并调用base.OnModelCreating以委托给默认方法(如果需要)。只要在当前方法中设置一个断点并测试它是否停止,您就会看到它不会停止。抱歉,您完全正确。我误解了有关new
vsoverride
关键字的文档。谢谢,lotDelete标志应该是时间戳,而不是bools。