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Could not load type 'System.Runtime.InteropServices.FILETIME'

Linnea Larsson

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12/02/2022

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02/09/2023 - 06:52

Hi,

I am trying to implement OPC services in our test framework and I am running in to this issue:

System.TypeLoadException
HResult=0x80131522
Message=Could not load type ‘System.Runtime.InteropServices.FILETIME’ from assembly ‘mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089’.
Source=OpcNetApi.Com
StackTrace:
at OpcCom.Da.Interop.GetItemValues(IntPtr& pInput, Int32 count, Boolean deallocate)
at OpcCom.Da20.Subscription.Read(ItemValueResult[] items, Boolean cache)
at OpcCom.Da20.Subscription.Read(ItemIdentifier[] itemIDs, Item[] items)
at OpcCom.Da.Subscription.Read(Item[] items)
at Opc.Da.Subscription.Read(Item[] items)

I have installed the latest redistributables and opc .net rcw, but it still gives me this error.

Randy Armstrong

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02/09/2023 - 13:56

Sounds like you are mixing .NET 4.0 and .NET 2.0 assemblies.

Do the sample clients build and run on your system?

Linnea Larsson

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02/10/2023 - 00:31

Hi,

Our project runs with .NET 6 and I have managed to do a Connect & Subscribe. I had some issues then, but when installing the redistributable for x64 it worked. But when trying to do a Read I ran in to this issue.

The sample clients build and run without issues.

What assemblies should I be looking at?

Randy Armstrong

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02/10/2023 - 01:08

I would upgrade the sample clients to .NET 6.0 and see if they still work.