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Posted by Nick Thissen

on 05/23/2020 18:51:59

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There is only one such cast in the very beginning. My guess is you are accidentally using this script on another binding as well? Otherwise I cannot explain why it would suddenly give you a string instead of an IEntitySessionResult object. Unless there's a bug somewhere.

There is also a "mistake" that you cast value before you check if it is null. If value is null (which I can see happening in some cases) then this cast will already throw an exception (but a different one).

You can probably fix it just by checking the type of the value first. Or casting it in a different way. You have several options, as a bonus I think they all do the null check automatically:

1. Use "is" to check the type, then cast only if it is the correct type. Probably no need for null check anymore.

if (value is IEntitySessionResult)
{
    var result = (IEntitySessionResult)value;

    // continue
}
else
{
    return "";
}

2. Use "as" to do a "safe" cast: if the type is not right, this will not error but just make result null. This is basically shorthand for option 1.

var result = value as IEntitySessionResult;
if (result == null)
{
    return "";
}

// continue

3. Or maybe even this one (not sure if we support this more recent C# feature) where the type check and cast is done at the same time:

if (value is IEntitySessionResult result)
{
    // continue
}
else 
{
    return "";
}