LoadOperation.TotalEntityCount什么时候等于-1?

[xhtmldivcss]

private void OnLoadSampleEntitiesCompleted(LoadOperation<SampleEntity> op)    
{      
    this.IsGridEnabled = true;        
    if (op.HasError)      
    {        
        // TODO: handle errors        
        op.MarkErrorAsHandled();      
    }      
    else if (!op.IsCanceled)      
    {        
        this._source.Source = op.Entities;          
        //搞不明白什么时候它会==-1
        if (op.TotalEntityCount != -1)        
        {          
            this._view.SetTotalItemCount(op.TotalEntityCount);        
        }      
    }    
}

if (op.TotalEntityCount != -1) //什么情况下它会等于负1呢？

[xhtmldivcss]

如果EntityQuery.IncludeTotalCount为false（默认），那么LoadOperatioin.TotalEntityCount为-1.

似乎在用DomainCollecitonView时，EntityQuery.IncludeTotalCount不用显式设置为true.

[lflljt]

来晚了

[wchy33]

不懂c#

[ypwDu]

不懂~~！
帮顶~！