Unable to cast COM object of type 'System.__ComObject' to interface type

When I implement the RtGet function by CSharp (by using Interop.EikonDesktopDataAPI and Interop.RTX), I meet an exception "Unable to cast COM object of type 'System.__ComObject' to interface type 'ThomsonReuters.Interop.RTX.IAdxRtList'". What's happened?

public List<RicItem> Get(List<RicItem> ricData)

{

this.ricData = ricData;
this.ricData.ForEach(ric =>
{this.adxRtList.RegisterItems(ric.Ric, ric.Field);
});

this.adxRtList.StartUpdates(RT_RunMode.RT_MODE_ONUPDATE);
syncMgr.WaitOne();

return this.ricData;

}

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Accepted answers

Zhenya Kovalyov

It is difficult to say without the full code, and it can be more than one issue. However, a good start will be to check if you are accessing and controlling adxRtList from the same thread it was created in. The COM objects should be created in a thread that runs in the single-threaded apartment mode (STA).

On a separate note, is there a reason why you are not using the native .NET Data API? Check out the tutorial.

All comments

Zhenya Kovalyov

On a separate note, is there a reason why you are not using the native .NET Data API? Check out the tutorial.

Dirk Ho

thanks very much!!! we want to make the API synchronized, so we use ManualResetEvent. maybe it's the problem for being multi-thread. for the second question, we want implement not only RtGet but RData & RHistory. the native .NET Data API can only meet the RtGet requirement, so...

Zhenya Kovalyov

.NET Data API supports real-time and time series, but not the reference data. Also, if you want to use the intraday time series intervals (tick, 1 minute, etc), your only option is .NET.

Zhenya Kovalyov

On a second thought, are you trying to use it in the console application?

Zhenya Kovalyov

comapiusageexampledexmultithreading.zip

Attached is the sample for the ManualResetEvent in a Console application with EikonDesktopData API. Let me know if this helps!

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