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POWhat's the use of System.String.Copy in .NET?
 

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  1. POWhat's the use of System.String.Copy in .NET?
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    <p>I'm afraid that this is a very silly question, but I must be missing something.</p> <p>Why might one want to use <a href="https://docs.microsoft.com/en-us/dotnet/api/system.string.copy" rel="nofollow noreferrer">String.Copy(string)</a>?</p> <p>The documentation says the method</p> <blockquote> <p>Creates a new instance of String with the same value as a specified String.</p> </blockquote> <p>Since strings are immutable in .NET, I'm not sure what's the benefit of using this method, as I'd think that </p> <pre><code> string copy = String.Copy(otherString); </code></pre> <p>would for all practical purposes seem to yield the same result as</p> <pre><code> string copy = otherString; </code></pre> <p>That is, except for whatever internal bookkeeping that's going on, and the fact that copy is not <code>ReferenceEquals</code> to otherString, there are no observable differences - String being an immutable class whose equality is based on value, not identity. (Thanks to @Andrew Hare for pointing out that my original phrasing was not precise enough to indicate that I realized there was a difference between <code>Copy</code>ing and not, but was concerned about the perceived lack of <em>useful</em> difference.)</p> <p>Of course when passed a <code>null</code> argument, Copy throws an <code>ArgumentNullException</code>, and the "new instance" might consume more memory. The latter hardly seems like a benefit, and I'm not sure that the null check is a big enough bonus to warrant a whole Copy method.</p> <p>Thanks.</p>
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