Navisworks API 选择空引用异常

Question

我正在尝试创建一个操作来检查 Autodesk Navisworks 中的当前选择是否是特定碰撞测试结果的一部分，最重要的是，选择包含任何选定元素的所有碰撞结果。

我获取碰撞结果和模型项目交集的代码：

internal List<ModelItem> GroupIntersectingClashResults(Guid clashTestId, NW.ModelItemCollection clashResultSelectionToCheck)
{
    DocumentClash clashData = doc.GetClash();
    DocumentClashTests clashTests = clashData.TestsData;
    var targetTest = clashTests.Tests.FirstOrDefault(t => t.Guid == clashTestId) as ClashTest;

    if (targetTest == null)
    {
        Log.Warning("Clash test not found for id: {Id}", clashTestId);
        return [];
    }

    List<IClashResult> intersectingResults = FindIntersectingClashResults(targetTest, clashResultSelectionToCheck);
    if (!intersectingResults.Any())
    {
        Log.Warning("No intersecting items found for clash test id: {Id}", clashTestId);
        return [];
    }

    var mic = new List<ModelItem>();
    
    foreach (IClashResult clashResult in intersectingResults)
    {
        mic.AddRange(clashResult.Selection1);
        mic.AddRange(clashResult.Selection2);
    }

    return mic;
}

private static List<IClashResult> FindIntersectingClashResults(ClashTest clashTest, NW.ModelItemCollection selectionToCheck)
{
    var intersectionResults = new List<IClashResult>();
    foreach (SavedItem item in clashTest.Children)
    {
        if (item is not IClashResult clashResult)
            continue;

        if (selectionToCheck.IsAnyContained(clashResult.CompositeItemSelection1) || selectionToCheck.IsAnyContained(clashResult.CompositeItemSelection2))
            intersectionResults.Add(clashResult);
    }

    return intersectionResults;
}

这段代码工作正常，我真的根据当前选择的项目获取模型项目。但是，当我尝试使用 Navisworks API 选择它们时，我收到以下代码的空引用异常：

public ClashResultsNavigatorControl()
{
    InitializeComponent();
    InitializeContextMenu();
    _doc = NW.Application.ActiveDocument;
    _clashTestNames = new Dictionary<Guid, string>();
    NW.Application.ActiveDocument.Models.CollectionChanged += OnDocumentChange;
    _doc.CurrentSelection.Changed += OnCurrentSelectionChange;
    Disposed += OnDispose;
    _doc.GetClash().TestsData.Changed += OnClashTestsDataChange;
}

private void OnCurrentSelectionChange(object sender, EventArgs e)
{
    try
    {
        var clashResultUtils = new ClashResultUtils(_doc);

        if (_doc.CurrentSelection.SelectedItems.Count == 0)
            return;

        List<ModelItem> selection = clashResultUtils
            .GroupIntersectingClashResults(_selectedClashTest.Guid, _doc.CurrentSelection.SelectedItems);

        foreach (ModelItem modelItem in selection)
        {
            
            var a = _doc.Models.FindIdForModelItem(modelItem);
        }
        if (selection.Count == 0)
            return;

        _doc.CurrentSelection.Changed -= OnCurrentSelectionChange;
        _doc.CurrentSelection.CopyFrom(selection);
    }
    catch (Exception ex)
    {
        ExceptionHandler.Handle(ex);
    }
    finally
    {
        _doc.CurrentSelection.Changed -= OnCurrentSelectionChange;
        _doc.CurrentSelection.Changed += OnCurrentSelectionChange;
    }
}

在线：

_doc.CurrentSelection.CopyFrom(selection);

但是该行中没有一个元素为空。 NativeHandle.cs 中的 RuntimeChecks 方法发生异常。

Answer 1

基本上，需要到达几何级别，然后返回到第一个对象。以这种方式创建的模型项集合可以用作当前选择。我尝试过的其他一切都不起作用。

private ModelItemCollection GetModelItemsFromClashResults(List<ClashResult> clashResults)
        {
            var modelItems = new List<ModelItem>();

            foreach (ClashResult clashResult in clashResults)
            {
                ModelItem firstObject1 = clashResult.CompositeItem1.FindFirstGeometry().Item.FindFirstObjectAncestor();
                ModelItem firstObject2 = clashResult.CompositeItem2.FindFirstGeometry().Item.FindFirstObjectAncestor();

                modelItems.Add(firstObject1);
                modelItems.Add(firstObject2);
            }

            var collectionToFocus = new ModelItemCollection();
            collectionToFocus.AddRange(modelItems);

            return collectionToFocus;
        }