The $
part tells the compiler that you want an interpolated string.
Interpolated strings are one of the new features of C# 6.0. They allow you to substitute placeholders in a string literal with their corresponding values.
You can put almost any expression between a pair of braces ({}
) inside an interpolated string and that expression will be substituted with the ToString
representation of that expression's result.
When the compiler encounters an interpolated string, it immediately converts it into a call to the String.Format
function. It is because of this that your first listing is essentially the same as writing:
throw new Exception(string.Format(
"One or more errors occured during removal of the company:{0}{1}{2}",
Envrionment.NewLine,
Environment.NewLine,
exc.Message));
As you can see, interpolated strings allow you to express the same thing in a much more succinct manner and in a way that is easier to get correct.
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