c# Expression lambda to vb.net

Question

After using converters (Redgate, Telerik, ...) I can not turn this expression c # to vb.net

if (afterItemRemoved != null)
        {
            cacheItemPolicy.RemovedCallback = x => afterItemRemoved(
                x.CacheItem.Key,
                (T)x.CacheItem.Value);
        }

I have tried without success the following expressions (Reflector 8.5 de RedGate y converter.telerik.com)

If (afterItemRemoved IsNot Nothing) Then
    cacheItemPolicy.RemovedCallback = x => afterItemRemoved.Invoke(x.CacheItem.Key, DirectCast(x.CacheItem.Value, T))
End If


If afterItemRemoved IsNot Nothing Then
    cacheItemPolicy.RemovedCallback = Function(x) afterItemRemoved(x.CacheItem.Key, DirectCast(x.CacheItem.Value, T))
End If

what you have tried looks completely different from the original one. why the function names are different in your attempt? — Sateesh Pagolu
– Sateesh Pagolu, Commented Sep 10, 2015 at 8:33
are two similar methods, is a transcription error. Thanks for your comment. — Eduardo Ortega García
– Eduardo Ortega García, Commented Sep 10, 2015 at 8:38
A tool converting "!=" (C#) into ">" (VB.NET) is certainly not too useful. — user2480047
– user2480047, Commented Sep 10, 2015 at 8:46

Sehnsucht · Accepted Answer · 2015-09-10 09:37:04Z

3

Looking at the documentation for RemovedCallback we can see that the required delegate signature is a void method (A Sub in VB.Net) (see CacheEntryRemovedCallback).

So the lambda expression needed has to be a "Sub Lambda" not a "Function lambda"

If afterItemRemoved IsNot Nothing Then
    cacheItemPolicy.RemoveCallback =
        Sub(x) afterItemRemoved(x.CacheItem.Key, DirectCast(x.CacheItem.Value, T))
End If

answered Sep 10, 2015 at 9:37

Sehnsucht

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