Question

我正在使用带有MVVM Concept和Enity框架的银光应用程序，并且在更新值时遇到一些麻烦。让我详细说明我的问题。我有三个表说A，B和C，其中B与A具有外键关系，C与B具有外键关系。我能够保存这些表没有任何问题。我正在使用视图绑定网格，并能够检索值以进行编辑，但无法更新对数据库的任何更改。虽然Update收到此错误**

消息：Silverlight应用程序代码中的未处理错误：4004
类别：ManagedRuntimeError消息： System.ServiceModel.DomainServices.Client.DomainOperationException：提交操作验证失败。请检查 EntitiesInError中每个实体的Entity.ValidationErrors以获取更多信息信息。恩 System.ServiceModel.DomainServices.Client.OperationBase.Complete（例外错误）en System.ServiceModel.DomainServices.Client.SubmitOperation.Complete（OperationErrorStatus errorStatus）en System.ServiceModel.DomainServices.Client.DomainContext＆LT;＆GT; C_ DisplayClassb.b _3（对象）

**

这里是视图模型类..

public void Save(object obj)
    {   
            _currentCustomer.ModifiedBy = App.CurrentUser;
            _currentCustomer.ModifiedDateTime = System.DateTime.Now;

            foreach (BizFramework.Web.Model.Address address in AddressCollection.ToList())
            {
                string address1 = Convert.ToString(address.Address1);
                if (address1 != null && address1.Trim()!="")
                {                        
                    CVEReference = (from addref in _currentCustomer.CustomerVendorEmployeeReferences 
                                  where addref.CustomerID == _currentCustomer.CustomerID 
                                  select addref).SingleOrDefault();

                    BizFramework.Web.Model.Address addressExists = (from rec in CVEReference.Addresses
                                                                    where rec.AddressTypeID == address.AddressTypeID
                                                                    select rec).SingleOrDefault();
                    if (addressExists != null)
                    {
                        address.ModifiedBy = App.CurrentUser;
                        address.ModifiedDateTime = System.DateTime.Now;
                    }
                    else
                    {
                        address.AddressGuid = System.Guid.NewGuid();
                        address.ApplicationOwner = App.CurrentUser;
                        address.CreatedBy = App.CurrentUser;
                        address.ModifiedBy = App.CurrentUser;
                        address.CreatedDateTime = System.DateTime.Now;
                        address.ModifiedDateTime = System.DateTime.Now;

                        CVEReference.Addresses.Add(address);
                    }

                }
                else
                {
                    //_currentCustomer.Addresses.Remove(address);
                    AddressCollection.Remove(address);
                    //dcBusinessAccountingContext.Addresses.Remove(address);
                }
            }                         

        dcBusinessAccountingContext.SubmitChanges();
    }

//Setting Table A from the view like this

_currentCustomer = (from CustomerAddress in dcBusinessAccountingContext.Customers
                                    where CustomerAddress.CustomerID == AddrView.CustomerID
                                    select CustomerAddress).SingleOrDefault();

其中_currentcustomer是A的实体Object，CVEReference是B的实体对象，AddrView是Table View的实体集，addresscollection是C的集合。我不知道哪里出错或可能是这个的原因错误。请指导我完成这个问题。谢谢。

Answer 1

错误说这是验证问题。将dcBusinessAccountingContext.SubmitChanges();更改为

dcBusinessAccountingContext.SubmitChanges(SubmitCallback, null);

然后你可以做一些错误检查：

private void SubmitCallback(SubmitOperation operation)
{
        if (operation.HasError)
        {
           //check "operation.EntitiesInError" for more details.
        }
}

希望这会对你有所帮助。

提交操作验证失败

1 个答案: