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    <p>If you control the places where you want to use this "extension operator" (which you normally do with extension methods anyway), you can do something like this:</p> <pre><code>class Program { static void Main(string[] args) { StringBuilder sb = new StringBuilder(); ReceiveImportantMessage(sb); Console.WriteLine(sb.ToString()); } // the important thing is to use StringBuilderWrapper! private static void ReceiveImportantMessage(StringBuilderWrapper sb) { sb += "Hello World!"; } } public class StringBuilderWrapper { public StringBuilderWrapper(StringBuilder sb) { StringBuilder = sb; } public StringBuilder StringBuilder { get; private set; } public static implicit operator StringBuilderWrapper(StringBuilder sb) { return new StringBuilderWrapper(sb); } public static StringBuilderWrapper operator +(StringBuilderWrapper sbw, string s) { sbw.StringBuilder.Append(s); return sbw; } } </code></pre> <p>The <code>StringBuilderWrapper</code> class declares an <a href="http://msdn.microsoft.com/en-us/library/85w54y0a.aspx" rel="noreferrer">implicit conversion operator</a> from a <code>StringBuilder</code> <em>and</em> declares the desired <code>+</code> operator. This way, a <code>StringBuilder</code> can be passed to <code>ReceiveImportantMessage</code>, which will be silently converted to a <code>StringBuilderWrapper</code>, where the <code>+</code> operator can be used.</p> <p>To make this fact more transparent to callers, you can declare <code>ReceiveImportantMessage</code> as taking a <code>StringBuilder</code> and just use code like this:</p> <pre><code> private static void ReceiveImportantMessage(StringBuilder sb) { StringBuilderWrapper sbw = sb; sbw += "Hello World!"; } </code></pre> <p>Or, to use it inline where you're already using a <code>StringBuilder</code>, you can simply do this:</p> <pre><code> StringBuilder sb = new StringBuilder(); StringBuilderWrapper sbw = sb; sbw += "Hello World!"; Console.WriteLine(sb.ToString()); </code></pre> <p>I created <a href="http://codecrafter.blogspot.com/2010/04/more-understandable-icomparable.html" rel="noreferrer">a post</a> about using a similar approach to make <code>IComparable</code> more understandable.</p>
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    1. COI think you meant that StringBuilderWrapper should inherit StringBuilder ?
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    2. CO@Leon: I really meant to compose it, not inherit from it. Anyway, I couldn't inherit from it since it's sealed.
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    3. COfair enough, but you're passing a StringBuilder to ReceiveImportantMessage, which expects a StringBuilderWrapper
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