Labview error 1779 when reading .NET core class property

[soundslikesound]

Hello, I am using external .NET built in .NET 8 library for SAP communication. When I try to read property of output class I get error 1779 and explaination 'LabVIEW: (Hex 0x6F3) The specified property was not found in the .NET Core type.' Property should return array of .NET class. Does it mean that array of .NET (8) Core class is not allowed in Labview? 

Or am I missing something? 

I am using Labview 2025 Q3

[Souhe]

Hello,

LabVIEW 2025 Q3 supports .NET Core and .NET 5+ (including .NET 8), but with some limitations.

To actually use, if you drop a .NET constructor node on the block diagram, right-click and select "Select .NET Core Constructor"

Using “Select .NET Core Constructor” ensures LabVIEW loads your .NET 8 DLL correctly.

Souha

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[soundslikesound]

Hello Souhe, 

if you check my screenshot I am creating creating class SapACBBackflash+ResultTable from Invoke node and then Property Node throws error. Property node does not allow me switch between .NET Core/Framework. Here I am attaching screenshot of the whole code. 

[Souhe]

Hello,

Thank you for the informations. Please review your .NET code to ensure the property you want Labview to access is declared as public. If Labview still cannot read the property, try exposing a property that returns a primitive array, to confirm Labview’s array support.

Alternatively, create a public method that returns the array, which can be called from labview using an Invoke Node. Also, verify that your assembly and all its dependencies are loaded correctly in Labview. and make sure both Labview 2025 Q3 and the .NET 8 runtime are fully updated to the latest patches.

References : Using .NET Assemblies with LabVIEW - NI

Characteristics of LabVIEW-Built .NET Framework Assemblies - NI

Souha

[soundslikesound · Accepted solution]

Hello Soohe, I did some changes inside my .NET code. Now inside GetData method  I am doing needed convertion and method now returns ResultTableItem (from ResultTable.DetailReturn[0]). It works fine when Labview reads class instead of array of classes. 

So I presume this is a bug and should be reported (don't know how, yet).

[Cloedu72]

Report as a Bug? 
=> https://www.ni.com/my/s/technical-support

Add a link to this Forum thread as well! 🙂

Best

Claude

[pawhan11]

https://forums.ni.com/t5/LabVIEW/State-of-Net-Core-in-2025Q3-Bugs-and-Errors/td-p/4454466

https://forums.ni.com/t5/LabVIEW/LabVIEW-2025Q3-NET-core-memory-leak/td-p/4456862

[soundslikesound]

Bug reported. Thank you for link!

[soundslikesound]

It seems .NET (core) support is still quite broken 😞 I hope most of the bugs will be solved in patches.