Entity framework 4 更新子实体时的OptimisticConcurrencyException

注意：这是基于我的问题，但有细微的不同。我已经解决了另一个问题，特别是关于子实体的问题。

我的数据结构如下：

安全政策1

create PROCEDURE dbo.sp_M2_Core_UpdateSecurityPolicy
    @ID int,
    @Name nvarchar(256),
    @Comment nvarchar(max)=null,
    @timestamp timestamp
AS

declare @nameExists nvarchar(256)

    select @nameExists= [Name] from M2_Core_SecurityPolicy where [Name]=@Name and [ID]<>@id
    if (not @nameExists is null)
    begin
        raiserror (N'Name is already in use: %s',
        11,
        1,
        @Name)
    end
    else
    begin
        update M2_Core_SecurityPolicy
            set [Name]=@Name,
                [Comment]=@Comment
                where id=@id and [timestamp]=@timestamp
        IF @@ROWCOUNT>0
            SELECT [Timestamp] AS newTimeStamp FROM M2_Core_SecurityPolicy WHERE id=@id
    end

go

create PROCEDURE dbo.sp_M2_Core_UpdateSecurityPolicyRule    
    (
    @id int,
    @RoleName nvarchar(256),
    @Rank int,
    @CanReadExecute bit=null,
    @CanWrite bit=null,
    @CanDelete bit=null,
    @CanExport bit=null,
    @Timestamp timestamp
    )

AS

    declare @roleExists nvarchar(256)
    declare @securityPolicyID int

    select @roleExists= [RoleName] from vw_aspnet_Roles where [RoleName]=@RoleName
    if (@roleExists is null)
    begin
        raiserror (N'Role is not defined: %s',
        11,
        1,
        @roleName)
    end
    else
    begin
        select @securityPolicyID=[SecurityPolicyID] from M2_Core_SecurityPolicyRule where [id]=@id

        -- move all other rules up in priority
        IF (SELECT COUNT(*) FROM M2_Core_SecurityPolicyRule WHERE [ID]<>@ID AND [SecurityPolicyID]=@SecurityPolicyID AND [Rank]=@Rank) > 0 
        BEGIN
            UPDATE M2_Core_SecurityPolicyRule
                SET [Rank]=[Rank]+1
                WHERE [Rank] >= @rank
                    AND [SecurityPolicyID]=@SecurityPolicyID
                    AND [ID]<>@ID
        END

        update M2_Core_SecurityPolicyRule
            set [RoleName]=@RoleName,
                [Rank]=@Rank,
                [CanReadExecute]=@CanReadExecute,
                [CanWrite]=@CanWrite,
                [CanDelete]=@CanDelete,
                [CanExport]=@CanExport              
                where id=@id and [timestamp]=@timestamp
        IF @@ROWCOUNT>0
            SELECT [Timestamp] AS newTimeStamp FROM M2_Core_SecurityPolicyRule WHERE id=@id

    end

    RETURN

go

[TestMethod()]
        public void AddWithSecurityPolicyRuleChangeRankTest()
        {
            ICoreContext coreContext = new CoreEntities(_coreDbConnectionString);
            CoreUnitOfWork coreUnitOfWork = new CoreUnitOfWork(coreContext);
            SecurityPolicyRepository target = new SecurityPolicyRepository(coreUnitOfWork);
            int originalCount = coreContext.SecurityPolicies.Count();
            string securityPolicyName = "addwithsecuritypolicyrulechangeruletest";
            int originalRank = 1;
            SecurityPolicy entity = new SecurityPolicy()
            {
                Comment = null,
                Name = securityPolicyName,
                SecurityPolicyRules = new FixUpCollection<SecurityPolicyRule>()
            };
            entity.SecurityPolicyRules.Add(
                new SecurityPolicyRule()
                {
                    CanDelete = null,
                    CanExport = null,
                    CanReadExecute = null,
                    CanWrite = null,
                    Rank = originalRank,
                    RoleName = "User"
                });
            target.Add(entity);
            coreUnitOfWork.Save();

            entity.SecurityPolicyRules[0].Rank=originalRank+1;
            coreUnitOfWork.Save(); // <-- exception thrown here
            SecurityPolicy savedSecurityPolicy = target.GetAll().Single(q => q.Name.Equals(securityPolicyName, StringComparison.CurrentCultureIgnoreCase));
            Assert.AreEqual(originalRank+1,savedSecurityPolicy.SecurityPolicyRules[0].Rank);
        }

entity.SecurityPolicyRules[0].Rank=originalRank+1;;
entity.SecurityPolicyRules[0].State = IWW.Elements.State.Modified;