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The () seems silly. is there a better way?
For example:
ExternalId.IfNotNullDo(() => ExternalId = ExternalId.Trim());
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No, there isn't. Lambda expressions are optimised (in terms of syntax) for the single parameter case. I know that the C# team feels your pain, and have tried to find an alternative. Whether there ever will be one or not is a different matter.
Yes, you can use multiple lines.
In 2010, the Dynamic Type was introduced and that gave us the ability to create dynamic lambda expressions.
#1,191 – Lambda Can't Capture ref or out Parameters Lambda expressions can make use of variables declared in a containing scope, i.e. outside of the expression itself. They cannot, however, use variables that are defined as ref or out parameters in an outer scope.
Sort of! There is a new idiom in town, that is nice and may help you in some cases. It is not fully what you want, but sometimes I think you will like it.
Since underscore ("_") is a valid C# identifier, it is becoming a common idiom to use it as a parameter name to a lambda in cases where you plan to ignore the parameter anyway. If other coders are aware of the idiom, they will know immediately that the parameter is irrelevant.
For example:
ExternalId.IfNotNullDo( _ => ExternalId=ExternalId.Trim()); Easy to type, conveys your intent, and easier on the eyes as well.
Of course, if you're passing your lambda to something that expects an expression tree, this may not work, because now you're passing a one-parameter lambda instead of a no-parameter lambda.
But for many cases, it is a nice solution.
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