我的代码中有一个相当奇怪的行为。我设计了一个Textblock，用一个数字来表示两个for循环的进度百分比。
50%的进展由IProgress报告基因从一个循环中报告，然后剩余的50%由第二个循环使用相同的IProgress报告基因报告。
循环的代码是这样的：

public List<List<string[]>> PopulateSourceList(Sources refSources, CancellationToken cancellationToken=default, ObservableCollectionEx<ISourceModel> NormalReferenceSourceItems = null, ObservableCollectionEx<ISourceModel> CourtCaseSourceItems = null, IProgress <Interfaces.Model.ProgressReport> sourceUpdateProgressReporting = null)
{
    Sources sources = refSources;
    int sourcesCount = sources.Count;
    List<NormalReferenceSourceModel> normalRefSources = new List<NormalReferenceSourceModel>();
    List<CourtCaseSourceModel> courtRefSources = new List<CourtCaseSourceModel>();

    for (int s = 1; s <= sourcesCount; s++)
    {
        if (cancellationToken.IsCancellationRequested)
        {
            cancellationToken.ThrowIfCancellationRequested();
        }
        Source source = sources[s];
        string cited = source?.Cited == true ? "YES" : "NO";
        string title;
        string year;
        try
        {
            title = source.Field["Title"];
        }
        catch (Exception)
        {
            title = string.Empty;
        }
        try
        {
            year = source.Field["Year"];
        }
        catch (Exception)
        {
            year = string.Empty;
        }
        string[] results = new string[] { authorBuilder.ToString(), title, cited, tag, year };
        if (caseType.Equals("case"))
        {
            courtRefSources?.Add(new CourtCaseSourceModel(authorBuilder.ToString(), title, cited, tag, year));
            cases.Add(results);
        }
        else
        {
            normalRefSources?.Add(new NormalReferenceSourceModel(authorBuilder.ToString(), title, cited, tag, year));
            items.Add(results);
        }
        int percentageP = (int)(Math.Round(s/(double)sourcesCount, 2) * 50);
        sourceUpdateProgressReporting.Report(new ProgressReport("SourcesExtraction", percentageP, 100));
    }

    if(NormalReferenceSourceItems != null)
    {
        normalRefSources.Sort();
        int articlesSourceCount = normalRefSources.Count;
        for (int a = 0; a < articlesSourceCount; a++)
        {
            NormalReferenceSourceItems.Add(normalRefSources[a]);
            int cuurentPercentage = 50 + (int)(Math.Round(a / (double)articlesSourceCount, 2) * 50);
            sourceUpdateProgressReporting.Report(new ProgressReport("SourcesExtraction", cuurentPercentage, 100));
        }
        sourceUpdateProgressReporting.Report(new Interfaces.Model.ProgressReport("Done", 100, 100));
    }
}

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对于IProgress报告器发送的每个报告，都会调用EventHandler。WPF ViewModel订阅该事件，并且绑定到TextBlock的Text的属性在事件侦听器中更新。报告的前半部分（50%）会在View中成功捕获和更新，但随后它会停止在那里，并且永远不会更新剩余的50%。
ViewModel中监听事件的方法如下：

private void OpenDocumentModel_SourceUpdateProgressChangedEvent(object sender, Interfaces.Helpers.SourceUpdateProgressEventArgs e)
{
    if (!ReportProgress) return;
    if (!e.ProgressState.Equals("Done"))
    {
        UpdateProgress = $"{(int)e.Value}%";
    }
    else
    {
        UpdateProgress = $"{(int)e.Value}%";
        UpdateProgress = string.Empty;
        ReportProgress = false;
        CenitxVisibility = "Visible";
        ProgressBarVisibility = "Collapsed";
    }
}

型
UpdatePrgress是绑定到TextBlock的属性。
属性从setter成功更新，但只有前50%在TextBlock本身上反映，当最终进度报告发送时。但奇怪的是，将UpdateProgress属性设置为string.empty的最后调用由TextBlock反映，View最终成功更新。
最后一个调用是携带“完成”作为进度状态的调用，由以下各项触发：

sourceUpdateProgressReporting.Report(new Interfaces.Model.ProgressReport("Done", 100, 100));

型
有没有人知道为什么会发生这种情况？