Question

我的ItemsControl中有一个Expander，而Expander中包含ProgressBars个视图。我的问题是当我加载数据时（这不是我的性能问题）然后我更新我的ItemSource我的gui冻结的PropertyChanged很长一段时间因为它需要很长时间来渲染。

有没有办法可以重新编辑gui元素异步，这样我的gui就不会冻结??? 我已经搜索了一下，虽然我不确定我的搜索结果是否解决了我的问题。所以我在这里问，希望有一个很好的解决方案。

他们gui确实看起来像这样......虽然通常有更多的元素 enter image description here 你们都可以将xaml代码隐藏在背后......

private void RefreshOverview(){
        ...
        foreach (Characteristic c in characteristics)
        {
            Area a = c.Area;

            Characteristic c1 = c;
            foreach (Line l in lines.Where(l => l.Product.Id == c1.Product.Id))
            {
                List<IMeasurementSchedule> measurementSchedules;
                // take DefaultMeasurementSchedules if exists
                if (c.DefaultMeasurementSchedules == null || c.DefaultMeasurementSchedules.Count == 0)
                    measurementSchedules = new List<IMeasurementSchedule>(l.LineMeasurementSchedules.ToArray());
                else
                    measurementSchedules = new List<IMeasurementSchedule>(c.DefaultMeasurementSchedules.ToArray());

                foreach (IMeasurementSchedule ms in measurementSchedules)
                {
                    MeasureCharacteristic mc;
                    if (a.PeripheryEnabled)
                    {
                        Line l1 = l;
                        foreach (AreaItem ai in areaitems.Where(x => x.AreaId == a.Id && x.LineId == l1.Id))
                        {
                            mc = (from cm in _context.CharacteristicMeasures.Local
                                  where cm.Charge == null &&
                                        cm.Characteristic.Id == c.Id &&
                                        cm.Line.Id == l.Id &&
                                        cm.ShiftIndex.Id == actualShiftIndex.Id &&
                                        cm.AreaItem != null &&
                                        cm.AreaItem.Id == ai.Id &&
                                        cm.MeasureScheduleId == ms.Id
                                  select cm).FirstOrDefault() ??
                                 new MeasureCharacteristic
                                     {
                                         Characteristic = c,
                                         Line = l,
                                         ShiftIndex = actualShiftIndex,
                                         AreaItem = ai
                                     };
                            mc.MeasureSchedule = ms;
                            characteristicsMeasures.Add(AddMeasures(mc));
                        }
                    }
                    else
                    {
                        mc = (from cm in _context.CharacteristicMeasures.Local
                              where cm.Charge == null &&
                                    cm.Characteristic.Id == c.Id &&
                                    cm.Line.Id == l.Id &&
                                    cm.ShiftIndex.Id == actualShiftIndex.Id &&
                                    cm.MeasureScheduleId == ms.Id
                              select cm).FirstOrDefault() ??
                             new MeasureCharacteristic {Characteristic = c, Line = l, ShiftIndex = actualShiftIndex};
                        mc.MeasureSchedule = ms;
                        characteristicsMeasures.Add(AddMeasures(mc));
                    }
                }
            }
        }
        MeasureCharacteristics = characteristicsMeasures;
        MeasureCharacteristicsByType =
            CharacteristicMeasureGroupedByType.GetExpanderViewProductItems(characteristicsMeasures);
    }

那是我的代码;）MeasureCharacteristicsByType是IEnumerable<CharacteristicMeasureGroupedByType>我将我的itemsource绑定到。如果您需要更多信息，请询问!!!

更新

这是我的xaml代码的链接.. http://pastebin.com/UA777LjW

Answer 1

您正在混合逻辑来构建数据和渲染操作。将这一个与另一个隔离以确定哪个花费时间。

例如，不要在与linq查询相同的for循环中影响MeasureCharacteristicsByType。然后使用StopWatch实例测量时间。

如果渲染花费的时间最多，请逐个（不是同时）在MeasureCharacteristicsByType中插入项目，并使用这种指令一个接一个地渲染它们：

foreach(var charMeasureByType in CharacteristicMeasureGroupedByType.GetExpanderViewProductItems(characteristicsMeasures))
{
    Dispatcher.BeginInvoke(new Action<OneTypeHere>((OneTypeHere item) =>
    {
       MeasureCharacteristicsByType.Add(item)
    }), DispatcherPriority.Background, charMeasureByType);
}

修改：OneTypeHere是charMeasureByType的类型。

wpf渲染gui异步

1 个答案: