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    <p>You cannot alias a class name in C#.</p> <p>There are things you can do that are not aliasing a class name in C#.</p> <p>But to answer the original question: you cannot alias a class name in C#.</p> <hr> <p><strong>Update:</strong> People are confused why <code>using</code> doesn't work. Example:</p> <p><strong>Form1.cs</strong></p> <pre><code>private void button1_Click(object sender, EventArgs e) { this.BackColor = ColorScheme.ApplyColorScheme(this.BackColor); } </code></pre> <p><strong>ColorScheme.cs</strong></p> <pre><code>class ColorScheme { public static Color ApplyColorScheme(Color c) { ... } } </code></pre> <p>And everything works. Now i want to create a <em>new</em> class, and <em>alias</em> <code>ColorScheme</code> to it (so that <strong>no code needs to be modified</strong>):</p> <p><strong>ColorScheme.cs</strong></p> <pre><code>using ColorScheme = Outlook2007ColorScheme; class Outlook2007ColorScheme { public static Color ApplyColorScheme(Color c) { ... } } </code></pre> <p>Ohh, i'm sorry. This code doesn't compile:</p> <p><img src="https://i.stack.imgur.com/GybrT.png" alt="enter image description here"></p> <p>My question was how to <em>alias</em> a class in C#. It cannot be done. There are things i can do that are <em>not</em> aliasing a class name in C#:</p> <ul> <li>change everyone who depends on <code>ColorScheme</code> to <code>using</code> <code>ColorScheme</code> instead (code change workaround because i cannot alias)</li> <li>change everyone who depends on <code>ColorScheme</code> to use a factory pattern them a polymorphic class or interface (code change workaround because i cannot alias)</li> </ul> <p>But these workarounds involve breaking existing code: not an option. </p> <p>If people depend on the presence of a <code>ColorScheme</code> class, i have to actually copy/paste a <code>ColorScheme</code> class.</p> <p>In other words: i cannot alias a class name in C#.</p> <p>This contrasts with other object oriented languages, where i could define the alias:</p> <pre><code>ColorScheme = Outlook2007ColorScheme </code></pre> <p>and i'd be done.</p>
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    1. POHow do I alias a class name in C#?
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    1. USIan Boyd
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    1. COYou absolutely can alias a class name in C#. "using <alias_name> = <fully_qualified_name>;"
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      1. USclemahieu
    2. COLIke @clemahieu said, you absolutely can alias a class name, you just have to use the fully qualified name. Additionally, if your aliasing a generic class, you can have to add the generic class qualifier. For example: using ShortName = MyNamespace.SubNamespace.GenericClass<MyType>;
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      1. USDan Morphis
    3. CO@Dan Morphis, @clemahieu: Problem with that is it doesn't compile, breaking existing code. The reason it doesn't compile is that you can only use the `using` in the scope that you can use the using.
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