ria域服务正在回调时设置客户端属性。

Question

我使用的是RIA域服务，实体框架4和silverlight 4。当我保存更改时，当服务调用返回时，一些域服务函数被调用为“不应该更改”的值。

我有两个实体

service.metadata.cs：

public partial class EntityA
{
    [Key]
    public Guid EntityA_Id { get; set; }

    public string Name { get; set; }

    public int EntityB_Id { get; set; }

    [Include]
    public EntityB entityB { get; set; }

}
public partial class EntityB
{
    [Required]
    public string Name { get; set; }

    public int EntityB_Id { get; set; }

    public EntityCollection<EntityA> entityA { get; set; }
}

在客户端，我在EntityA上有一个额外的属性来公开Name属性od EntityB。服务器端和域服务不需要知道这个属性，它只用于GUI。

public partial class EntityA
{
    //Tags I have tried:
    //[IgnoreDataMember]
    //[XmlIgnore]
    //[Ignore]
    //[Exclude]
    public string NameOf_EntityB
    {
        get
        {
            return this.entityB == null ? string.Empty : this.entityB.Name;
        }
        set
        {
            this.entityB.Name = value;
        }
    }
}

如果我编辑实体A的名称并调用serviceContext.SubmitChanges()，当调用返回某个域服务进程时正在设置EntityA.NameOf_EntityB = ""；因此，从用户的角度来看，它们保存一个值，而另一个值空白.。

我要阻止这一切的发生。我尝试过各种数据属性，但它们要么不能在客户端工作，要么没有效果。

知道如何阻止域服务更改此值吗？

以下是值更改前的调用堆栈：

System.ServiceModel.DomainServices.Client!System.ServiceModel.DomainServices.Client.ObjectStateUtility.**ApplyValue**(object o, object value, System.Reflection.PropertyInfo propertyInfo, System.Collections.Generic.IDictionary<string,object> originalState, System.ServiceModel.DomainServices.Client.LoadBehavior loadBehavior) + 0x74 bytes   
System.ServiceModel.DomainServices.Client!System.ServiceModel.DomainServices.Client.ObjectStateUtility.ApplyState(object o, System.Collections.Generic.IDictionary<string,object> stateToApply, System.Collections.Generic.IDictionary<string,object> originalState, System.ServiceModel.DomainServices.Client.LoadBehavior loadBehavior) + 0x330 bytes 
System.ServiceModel.DomainServices.Client!System.ServiceModel.DomainServices.Client.Entity.ApplyState(System.Collections.Generic.IDictionary<string,object> entityStateToApply, System.ServiceModel.DomainServices.Client.LoadBehavior loadBehavior) + 0x68 bytes   
System.ServiceModel.DomainServices.Client!System.ServiceModel.DomainServices.Client.Entity.Merge(System.ServiceModel.DomainServices.Client.Entity otherEntity, System.ServiceModel.DomainServices.Client.LoadBehavior loadBehavior) + 0x5a bytes    
System.ServiceModel.DomainServices.Client!System.ServiceModel.DomainServices.Client.DomainContext.ApplyMemberSynchronizations(System.Collections.Generic.IEnumerable<System.ServiceModel.DomainServices.Client.ChangeSetEntry> changeSetResults) + 0x10e bytes  
System.ServiceModel.DomainServices.Client!System.ServiceModel.DomainServices.Client.DomainContext.ProcessSubmitResults(System.ServiceModel.DomainServices.Client.EntityChangeSet changeSet, System.Collections.Generic.IEnumerable<System.ServiceModel.DomainServices.Client.ChangeSetEntry> changeSetResults) + 0x262 bytes    
System.ServiceModel.DomainServices.Client!System.ServiceModel.DomainServices.Client.DomainContext.CompleteSubmitChanges(System.IAsyncResult asyncResult) + 0x1cb bytes  
System.ServiceModel.DomainServices.Client!System.ServiceModel.DomainServices.Client.DomainContext.SubmitChanges.AnonymousMethod__5() + 0x2e bytes   

编辑：目前发现了一项工作。在ServiceContext.submitChanges()调用的回调中，我可以调用ServiceContext.RejectChanges()来撤消对EntityB的更改。不过，我不相信这个解决方案，因为在异步调用返回之前还可以进行其他更改，而且这些更改也会被拒绝。理想的解决方案是忽略该值，而根本不设置该值。

Answer 1

您可能需要更多地告诉WCF RIA关于您的实体的一些属性：

public partial class EntityA
{
    [Key]
    public Guid EntityA_Id { get; set; }

    public string Name { get; set; }

    public int EntityB_Id { get; set; }

    [Include]
    [Association("EntityA-EntityB", "EntityA_Id", "EntityB_Id", IsForeignKey=false)]
    public EntityB entityB { get; set; }

}

public partial class EntityB
{
    [Required]
    public string Name { get; set; }

    [Key]
    public int EntityB_Id { get; set; }

    public Guid EntityA_Id { get; set; }

    [Include]
    [Association("EntityA-EntityB", "EntityA_Id", "EntityB_Id", IsForeignKey=true)]
    public EntityCollection<EntityA> entityA { get; set; }
}

Answer 2

这是我的解决方案：

private bool isExpanded = false;

public bool IsExpanded
{
    get { return isExpanded; }
    set
    {
        string stack = (new System.Diagnostics.StackTrace()).ToString();
        if (!stack.Contains("ObjectStateUtility.ApplyState") && isExpanded != value)
        {
            isExpanded = value;
            RaisePropertyChanged("IsExpanded");
        }
    }
}