Question

当我将鼠标悬停在应用程序窗口上时，我的DispatcherTimer落后了，我使用Windows窗体和相同的代码测试了同样的东西，只使用了来自Forms的Timer，它没有任何延迟。

这是我的代码：

{
    double dps1 = 2;
    double count;

    DispatcherTimer DPS = new DispatcherTimer();
    public MainWindow()
    {
        InitializeComponent();

        DPS.Tick += new EventHandler(DPS_tick);
        DPS.Interval = new TimeSpan(1);
    }

    private void DPS_tick(object sender, EventArgs e)
    {
        count += dps1 / 2500;
        lbl.Content = count;
    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        DPS.Start();
    }

以下是实际计划的GIF：https://i.imgur.com/d91bxJD.gifv

Answer 1

首先，您使用UI调度程序安排计时器滴答。要证明这一点，请将以下内容添加到构造函数中。

External Native Build Issues
Build command failed.
Error while executing process /home/m/Android/Sdk/ndk-bundle/ndk-build with arguments {NDK_PROJECT_PATH=null APP_BUILD_SCRIPT=/home/m/AndroidStudioProjects/NDKTest3/jni/Android.mk APP_ABI=armeabi-v7a NDK_ALL_ABIS=armeabi-v7a NDK_DEBUG=1 APP_PLATFORM=android-21 NDK_OUT=/home/m/AndroidStudioProjects/NDKTest3/app/build/intermediates/ndkBuild/debug/obj NDK_LIBS_OUT=/home/m/AndroidStudioProjects/NDKTest3/app/build/intermediates/ndkBuild/debug/lib APP_SHORT_COMMANDS=false LOCAL_SHORT_COMMANDS=false -B -n}
local c includes= /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/../../api /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/../../ccmain /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/../../ccstruct /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/../../ccutil /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/../../classify /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/../../cutil /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/../../dict /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/../../image /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/../../textord /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/../../third_party /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/../../wordrec /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/../../opencl /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/../../viewer /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/../../../leptonica/include
local path=/home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni
local src files  = ../../api/baseapi.cpp ../../api/capi.cpp ../../api/renderer.cpp ../../ccmain/adaptions.cpp ../../ccmain/applybox.cpp ../../ccmain/control.cpp ../../ccmain/docqual.cpp ../../ccmain/equationdetect.cpp ../../ccmain/fixspace.cpp ../../ccmain/fixxht.cpp ../../ccmain/linerec.cpp ../../ccmain/ltrresultiterator.cpp ../../ccmain/osdetect.cpp ../../ccmain/output.cpp ../../ccmain/pageiterator.cpp ../../ccmain/pagesegmain.cpp ../../ccmain/pagewalk.cpp ../../ccmain/paragraphs.cpp ../../ccmain/paramsd.cpp ../../ccmain/par_control.cpp ../../ccmain/pgedit.cpp ../../ccmain/recogtraining.cpp ../../ccmain/reject.cpp ../../ccmain/resultiterator.cpp ../../ccmain/superscript.cpp ../../ccmain/tessbox.cpp ../../ccmain/tessedit.cpp ../../ccmain/tesseractclass.cpp ../../ccmain/tessvars.cpp ../../ccmain/tfacepp.cpp ../../ccmain/thresholder.cpp ../../ccmain/werdit.cpp ../../ccstruct/blamer.cpp ../../ccstruct/blobbox.cpp ../../ccstruct/blobs.cpp ../../ccstruct/blread.cpp ../../ccstruct/boxread.cpp ../../ccstruct/boxword./home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/Android.mk:48: *cp** Android NDK:p  Aborting.   .. .  Stop.
/../ccstruct/ccstruct.cpp ../../ccstruct/coutln.cpp ../../ccstruct/detlinefit.cpp ../../ccstruct/dppoint.cpp ../../ccstruct/fontinfo.cpp ../../ccstruct/genblob.cpp ../../ccstruct/imagedata.cpp ../../ccstruct/linlsq.cpp ../../ccstruct/matrix.cpp ../../ccstruct/mod128.cpp ../../ccstruct/normalis.cpp ../../ccstruct/ocrblock.cpp ../../ccstruct/ocrpara.cpp ../../ccstruct/ocrrow.cpp ../../ccstruct/otsuthr.cpp ../../ccstruct/pageres.cpp ../../ccstruct/params_training_featdef.cpp ../../ccstruct/pdblock.cpp ../../ccstruct/points.cpp ../../ccstruct/polyaprx.cpp ../../ccstruct/polyblk.cpp ../../ccstruct/publictypes.cpp ../../ccstruct/quadlsq.cpp ../../ccstruct/quspline.cpp ../../ccstruct/ratngs.cpp ../../ccstruct/rect.cpp ../../ccstruct/rejctmap.cpp ../../ccstruct/seam.cpp ../../ccstruct/split.cpp ../../ccstruct/statistc.cpp ../../ccstruct/stepblob.cpp ../../ccstruct/vecfuncs.cpp ../../ccstruct/werd.cpp ../../ccutil/ambigs.cpp ../../ccutil/basedir.cpp ../../ccutil/bits16.cpp ../../ccutil/bitvector.cpp ../../ccutil/ccutil.cpp ../../ccutil/clst.cpp ../../ccutil/elst2.cpp ../../ccutil/elst.cpp ../../ccutil/errcode.cpp ../../ccutil/globaloc.cpp ../../ccutil/indexmapbidi.cpp ../../ccutil/mainblk.cpp ../../ccutil/memry.cpp ../../ccutil/params.cpp ../../ccutil/scanutils.cpp ../../ccutil/serialis.cpp ../../ccutil/strngs.cpp ../../ccutil/tessdatamanager.cpp ../../ccutil/tprintf.cpp ../../ccutil/unicharcompress.cpp ../../ccutil/unichar.cpp ../../ccutil/unicharmap.cpp ../../ccutil/unicharset.cpp ../../ccutil/unicodes.cpp ../../ccutil/universalambigs.cpp ../../classify/adaptive.cpp ../../classify/adaptmatch.cpp ../../classify/blobclass.cpp ../../classify/classify.cpp ../../classify/cluster.cpp ../../classify/clusttool.cpp ../../classify/cutoffs.cpp ../../classify/errorcounter.cpp ../../classify/featdefs.cpp ../../classify/float2int.cpp ../../classify/fpoint.cpp ../../classify/intfeaturedist.cpp ../../classify/intfeaturemap.cpp ../../classify/intfeaturespace.cpp ../../classify/intfx.cpp ../../classify/intmatcher.cpp ../../classify/intproto.cpp ../../classify/kdtree.cpp ../../classify/mastertrainer.cpp ../../classify/mf.cpp ../../classify/mfdefs.cpp ../../classify/mfoutline.cpp ../../classify/mfx.cpp ../../classify/normfeat.cpp ../../classify/normmatch.cpp ../../classify/ocrfeatures.cpp ../../classify/outfeat.cpp ../../classify/picofeat.cpp ../../classify/protos.cpp ../../classify/sampleiterator.cpp ../../classify/shapeclassifier.cpp ../../classify/shapetable.cpp ../../classify/tessclassifier.cpp ../../classify/trainingsample.cpp ../../classify/trainingsampleset.cpp ../../cutil/bitvec.cpp ../../cutil/callcpp.cpp ../../cutil/cutil_class.cpp ../../cutil/cutil.cpp ../../cutil/danerror.cpp ../../cutil/efio.cpp ../../cutil/emalloc.cpp ../../cutil/oldlist.cpp ../../cutil/structures.cpp ../../dict/context.cpp ../../dict/dawg_cache.cpp ../../dict/dawg.cpp ../../dict/dict.cpp ../../dict/hyphen.cpp ../../dict/permdawg.cpp ../../dict/stopper.cpp ../../dict/trie.cpp ../../textord/alignedblob.cpp ../../textord/baselinedetect.cpp ../../textord/bbgrid.cpp ../../textord/blkocc.cpp ../../textord/blobgrid.cpp ../../textord/ccnontextdetect.cpp ../../textord/cjkpitch.cpp ../../textord/colfind.cpp ../../textord/colpartition.cpp ../../textord/colpartitiongrid.cpp ../../textord/colpartitionset.cpp ../../textord/devanagari_processing.cpp ../../textord/drawedg.cpp ../../textord/drawtord.cpp ../../textord/edgblob.cpp ../../textord/edgloop.cpp ../../textord/equationdetectbase.cpp ../../textord/fpchop.cpp ../../textord/gap_map.cpp ../../textord/imagefind.cpp ../../textord/linefind.cpp ../../textord/makerow.cpp ../../textord/oldbasel.cpp ../../textord/pithsync.cpp ../../textord/pitsync1.cpp ../../textord/scanedg.cpp ../../textord/sortflts.cpp ../../textord/strokewidth.cpp ../../textord/tabfind.cpp ../../textord/tablefind.cpp ../../textord/tablerecog.cpp ../../textord/tabvector.cpp ../../textord/textlineprojection.cpp ../../textord/textord.cpp ../../textord/topitch.cpp ../../textord/tordmain.cpp ../../textord/tospace.cpp ../../textord/tovars.cpp ../../textord/underlin.cpp ../../textord/wordseg.cpp ../../textord/workingpartset.cpp ../../viewer/scrollview.cpp ../../viewer/svmnode.cpp ../../viewer/svpaint.cpp ../../viewer/svutil.cpp ../../wordrec/associate.cpp ../../wordrec/chop.cpp ../../wordrec/chopper.cpp ../../wordrec/drawfx.cpp ../../wordrec/findseam.cpp ../../wordrec/gradechop.cpp ../../wordrec/language_model.cpp ../../wordrec/lm_consistency.cpp ../../wordrec/lm_pain_points.cpp ../../wordrec/lm_state.cpp ../../wordrec/outlines.cpp ../../wordrec/params_model.cpp ../../wordrec/pieces.cpp ../../wordrec/plotedges.cpp ../../wordrec/render.cpp ../../wordrec/segsearch.cpp ../../wordrec/tface.cpp ../../wordrec/wordclass.cpp ../../wordrec/wordrec.cpp
Android NDK: /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/Android.mk: Cannot find module with tag 'base/port' in import path    
Android NDK: Are you sure your NDK_MODULE_PATH variable is properly defined ?    
Android NDK: The following directories were searched:    
Android NDK:         
Build command failed.
Error while executing process /home/m/Android/Sdk/ndk-bundle/ndk-build with arguments {NDK_PROJECT_PATH=null APP_BUILD_SCRIPT=/home/m/AndroidStudioProjects/NDKTest3/jni/Android.mk APP_ABI=armeabi-v7a NDK_ALL_ABIS=armeabi-v7a NDK_DEBUG=0 APP_PLATFORM=android-21 NDK_OUT=/home/m/AndroidStudioProjects/NDKTest3/app/build/intermediates/ndkBuild/release/obj NDK_LIBS_OUT=/home/m/AndroidStudioProjects/NDKTest3/app/build/intermediates/ndkBuild/release/lib APP_SHORT_COMMANDS=false LOCAL_SHORT_COMMANDS=false -B -n}
local c includes= /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/../../api /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/../../ccmain /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/../../ccstruct /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/../../ccutil /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/../../classify /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/../../cutil /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/../../dict /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/../../image /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/../../textord /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/../../third_party /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/../../wordrec /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/../../opencl /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/../../viewer /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/../../../leptonica/include
local path=/home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni
local src files  = ../../api/baseapi.cpp ../../api/capi.cpp ../../api/renderer.cpp ../../ccmain/adaptions.cpp ../../ccmain/applybox.cpp ../../ccmain/control.cpp ../../ccmain/docqual.cpp ../../ccmain/equationdetect.cpp ../../ccmain/fixspace.cpp ../../ccmain/fixxht.cpp ../../ccmain/linerec.cpp ../../ccmain/ltrresultiterator.cpp ../../ccmain/osdetect.cpp ../../ccmain/output.cpp ../../ccmain/pageiterator.cpp ../../ccmain/pagesegmain.cpp ../../ccmain/pagewalk.cpp ../../ccmain/paragraphs.cpp ../../ccmain/paramsd.cpp ../../ccmain/par_control.cpp ../../ccmain/pgedit.cpp ../../ccmain/recogtraining.cpp ../../ccmain/reject.cpp ../../ccmain/resultiterator.cpp ../../ccmain/superscript.cpp ../../ccmain/tessbox.cpp ../../ccmain/tessedit.cpp ../../ccmain/tesseractclass.cpp ../../ccmain/tessvars.cpp ../../ccmain/tfacepp.cpp ../../ccmain/thresholder.cpp ../../ccmain/werdit.cpp ../../ccstruct/blamer.cpp ../../ccstruc/home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/Android.mk:48: *** Android NDK: Aborting.    .  Stop.
t/blobbox.cpp ../../ccstruct/blobs.cpp ../../ccstruct/blread.cpp ../../ccstruct/boxread.cpp ../../ccstruct/boxword.cpp ../../ccstruct/ccstruct.cpp ../../ccstruct/coutln.cpp ../../ccstruct/detlinefit.cpp ../../ccstruct/dppoint.cpp ../../ccstruct/fontinfo.cpp ../../ccstruct/genblob.cpp ../../ccstruct/imagedata.cpp ../../ccstruct/linlsq.cpp ../../ccstruct/matrix.cpp ../../ccstruct/mod128.cpp ../../ccstruct/normalis.cpp ../../ccstruct/ocrblock.cpp ../../ccstruct/ocrpara.cpp ../../ccstruct/ocrrow.cpp ../../ccstruct/otsuthr.cpp ../../ccstruct/pageres.cpp ../../ccstruct/params_training_featdef.cpp ../../ccstruct/pdblock.cpp ../../ccstruct/points.cpp ../../ccstruct/polyaprx.cpp ../../ccstruct/polyblk.cpp ../../ccstruct/publictypes.cpp ../../ccstruct/quadlsq.cpp ../../ccstruct/quspline.cpp ../../ccstruct/ratngs.cpp ../../ccstruct/rect.cpp ../../ccstruct/rejctmap.cpp ../../ccstruct/seam.cpp ../../ccstruct/split.cpp ../../ccstruct/statistc.cpp ../../ccstruct/stepblob.cpp ../../ccstruct/vecfuncs.cpp ../../ccstruct/werd.cpp ../../ccutil/ambigs.cpp ../../ccutil/basedir.cpp ../../ccutil/bits16.cpp ../../ccutil/bitvector.cpp ../../ccutil/ccutil.cpp ../../ccutil/clst.cpp ../../ccutil/elst2.cpp ../../ccutil/elst.cpp ../../ccutil/errcode.cpp ../../ccutil/globaloc.cpp ../../ccutil/indexmapbidi.cpp ../../ccutil/mainblk.cpp ../../ccutil/memry.cpp ../../ccutil/params.cpp ../../ccutil/scanutils.cpp ../../ccutil/serialis.cpp ../../ccutil/strngs.cpp ../../ccutil/tessdatamanager.cpp ../../ccutil/tprintf.cpp ../../ccutil/unicharcompress.cpp ../../ccutil/unichar.cpp ../../ccutil/unicharmap.cpp ../../ccutil/unicharset.cpp ../../ccutil/unicodes.cpp ../../ccutil/universalambigs.cpp ../../classify/adaptive.cpp ../../classify/adaptmatch.cpp ../../classify/blobclass.cpp ../../classify/classify.cpp ../../classify/cluster.cpp ../../classify/clusttool.cpp ../../classify/cutoffs.cpp ../../classify/errorcounter.cpp ../../classify/featdefs.cpp ../../classify/float2int.cpp ../../classify/fpoint.cpp ../../classify/intfeaturedist.cpp ../../classify/intfeaturemap.cpp ../../classify/intfeaturespace.cpp ../../classify/intfx.cpp ../../classify/intmatcher.cpp ../../classify/intproto.cpp ../../classify/kdtree.cpp ../../classify/mastertrainer.cpp ../../classify/mf.cpp ../../classify/mfdefs.cpp ../../classify/mfoutline.cpp ../../classify/mfx.cpp ../../classify/normfeat.cpp ../../classify/normmatch.cpp ../../classify/ocrfeatures.cpp ../../classify/outfeat.cpp ../../classify/picofeat.cpp ../../classify/protos.cpp ../../classify/sampleiterator.cpp ../../classify/shapeclassifier.cpp ../../classify/shapetable.cpp ../../classify/tessclassifier.cpp ../../classify/trainingsample.cpp ../../classify/trainingsampleset.cpp ../../cutil/bitvec.cpp ../../cutil/callcpp.cpp ../../cutil/cutil_class.cpp ../../cutil/cutil.cpp ../../cutil/danerror.cpp ../../cutil/efio.cpp ../../cutil/emalloc.cpp ../../cutil/oldlist.cpp ../../cutil/structures.cpp ../../dict/context.cpp ../../dict/dawg_cache.cpp ../../dict/dawg.cpp ../../dict/dict.cpp ../../dict/hyphen.cpp ../../dict/permdawg.cpp ../../dict/stopper.cpp ../../dict/trie.cpp ../../textord/alignedblob.cpp ../../textord/baselinedetect.cpp ../../textord/bbgrid.cpp ../../textord/blkocc.cpp ../../textord/blobgrid.cpp ../../textord/ccnontextdetect.cpp ../../textord/cjkpitch.cpp ../../textord/colfind.cpp ../../textord/colpartition.cpp ../../textord/colpartitiongrid.cpp ../../textord/colpartitionset.cpp ../../textord/devanagari_processing.cpp ../../textord/drawedg.cpp ../../textord/drawtord.cpp ../../textord/edgblob.cpp ../../textord/edgloop.cpp ../../textord/equationdetectbase.cpp ../../textord/fpchop.cpp ../../textord/gap_map.cpp ../../textord/imagefind.cpp ../../textord/linefind.cpp ../../textord/makerow.cpp ../../textord/oldbasel.cpp ../../textord/pithsync.cpp ../../textord/pitsync1.cpp ../../textord/scanedg.cpp ../../textord/sortflts.cpp ../../textord/strokewidth.cpp ../../textord/tabfind.cpp ../../textord/tablefind.cpp ../../textord/tablerecog.cpp ../../textord/tabvector.cpp ../../textord/textlineprojection.cpp ../../textord/textord.cpp ../../textord/topitch.cpp ../../textord/tordmain.cpp ../../textord/tospace.cpp ../../textord/tovars.cpp ../../textord/underlin.cpp ../../textord/wordseg.cpp ../../textord/workingpartset.cpp ../../viewer/scrollview.cpp ../../viewer/svmnode.cpp ../../viewer/svpaint.cpp ../../viewer/svutil.cpp ../../wordrec/associate.cpp ../../wordrec/chop.cpp ../../wordrec/chopper.cpp ../../wordrec/drawfx.cpp ../../wordrec/findseam.cpp ../../wordrec/gradechop.cpp ../../wordrec/language_model.cpp ../../wordrec/lm_consistency.cpp ../../wordrec/lm_pain_points.cpp ../../wordrec/lm_state.cpp ../../wordrec/outlines.cpp ../../wordrec/params_model.cpp ../../wordrec/pieces.cpp ../../wordrec/plotedges.cpp ../../wordrec/render.cpp ../../wordrec/segsearch.cpp ../../wordrec/tface.cpp ../../wordrec/wordclass.cpp ../../wordrec/wordrec.cpp
Android NDK: /home/m/AndroidStudioProjects/NDKTest3/jni/../tesseract/android/jni/Android.mk: Cannot find module with tag 'base/port' in import path    
Android NDK: Are you sure your NDK_MODULE_PATH variable is properly defined ?    
Android NDK: The following directories were searched:    
Android NDK:

你会注意到我是对的。因此，当您摆动鼠标时，UI线程正忙于鼠标事件，正如Hans所说的那样，优先级高于计时器滴答。不管它。

你可以通过使用在后台线程上运行的不同计时器实现来解决这个问题，然后将其传递到UI线程以在tick上更新UI。

我是MVVM的粉丝，绑定会自动处理UI线程上的调用更新，所以我的repro与你的不同。

首先，在UI中为标签添加绑定。

if(DPS.Dispatcher != Dispatcher.CurrentDispatcher || // UI thread, UI dispatcher
   DPS.Dispatcher != Application.Current.Dispatcher || // Also the UI dispatcher
   DPS.Dispatcher != Dispatcher) // the window's dispatcher
    throw new InvalidOperationException("Will is wrong");

我们将在按钮上重复使用Click事件，为此创建一个ICommand有点过分。接下来，更新您的Window代码，使其如下所示

<Label Content="{Binding Count}" />

我使用System.Windows.Threading.Timer来处理我的刻度，其间隔为ms（.0001ms是刻度，粗略排序）。如果您运行此示例，您的UI将不再滞后。

当我将鼠标悬停在应用程序窗口上时，为什么WPF中的Dispatcher Timer会滞后？

1 个答案: