topic Re: System.IO.FileNotFoundException(API dll Name) in Navisworks API Forum

System.IO.FileNotFoundException(API dll Name)

yale.choi — Wed, 19 Feb 2025 05:12:33 GMT

I am currently developing with the Navisworks API using VB.NET. The version of Navisworks I am using is Navisworks 2024 Manage, and my development environment is Visual Studio 2019. I am working with .NET Framework version 4.8.2.

The plugin folder I am using is located at C:\Program Files\Autodesk\Navisworks Manage 2024\Plugins.

While I have successfully built the project, I am encountering a System.IO.FileNotFoundException error.

The DLL in question is present in the folder, so I am curious about what might be causing this error despite the DLL being available.

Re: System.IO.FileNotFoundException(API dll Name)

naveen.kumar.t — Wed, 19 Feb 2025 05:28:45 GMT

Hi @yale.choi ,

Could you provide a simple, non-confidential Visual Studio project with a step-by-step guide to reproduce the issue on my end? Please refrain from sharing any information that you consider confidential to yourself or your company. Additionally, kindly include the expected and observed results.

Re: System.IO.FileNotFoundException(API dll Name)

yale.choi — Wed, 19 Feb 2025 06:46:14 GMT

The code I’m sharing is for testing purposes only, so there’s no concern regarding confidentiality. I’ve set the project to run in Debug mode to aid in debugging, and I’ve confirmed that Navisworks opens and the Command button works as expected. The issue arises when the process halts during the execution of the Test_SelectionSet procedure, as shown in the capture.

This Test_SelectionSet procedure is located in the Module_TestCommand, not in the Plugin Class, which may be a key point to note. For your reference, I’ve included the code for the Test_SelectionSet procedure in case it helps clarify the issue.

Sub Test_SelectionSet() Dim CurrDocument As Api.Document = Api.Application.ActiveDocument Dim ModelSearch As New Api.Search ModelSearch.Selection.SelectAll() ModelSearch.SearchConditions.Add(Api.SearchCondition.HasPropertyByDisplayName("Standard", "Object ID").EqualValue(Api.VariantData.FromDisplayString("00013885-0000-0000-CB32-FDD45E65CE05"))) ModelSearch.Locations = Api.SearchLocations.DescendantsAndSelf Dim MyCollection As Api.ModelItemCollection = ModelSearch.FindAll(CurrDocument, False) CurrDocument.SelectionSets.InsertCopy(0, New Api.SelectionSet(MyCollection) With {.DisplayName = "Test1"}) ComFunc.CustomControls.CustomMessageBox("Done.", "Inform", WindowForms.MessageBoxIcon.Information) End Sub

Re: System.IO.FileNotFoundException(API dll Name)

naveen.kumar.t — Wed, 19 Feb 2025 09:40:41 GMT

Hi @yale.choi ,

I am still unclear about the issue you reported.

From what I understand, you are adding the CS_Navis_API.dll to your CS_API project. The CS_Navis_API.dll contains the Test_SelectionSet method.

To investigate, I created a simple project named CS_Navis_API, added the CS_Navis_API.dll, and was able to access the Test_SelectionSet method within the CS_Navis_API project without any issues.

In general, if the main plugin is deployed to <Navisworks Installation Folder>\Plugins, its dependent DLLs should be placed in the <Navisworks Installation Folder>\Dependencies folder.

If this approach does not resolve the issue, please provide an isolated test project with detailed, step-by-step instructions to reproduce the problem on my end.