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    <p>Just to clarify: not everyone agrees with the authors of StyleCop. Win32 and .NET guru Jeffrey Richter writes in his excellent book <a href="http://oreilly.com/catalog/9780735627048" rel="noreferrer"><em>CLR via C#</em></a>: </p> <blockquote> <p>The C# language specification states, “As a matter of style, use of the keyword is favored over use of the complete system type name.” I disagree with the language specification; I prefer to use the FCL type names and completely avoid the primitive type names. In fact, I wish that compilers didn’t even offer the primitive type names and forced developers to use the FCL type names instead. Here are my reasons:</p> <ul> <li><p>I’ve seen a number of developers confused, not knowing whether to use <strong>string</strong> or <strong>String</strong> in their code. Because in C# <strong>string</strong> (a keyword) maps exactly to <strong>System.String</strong> (an FCL type), there is no difference and either can be used. Similarly, I’ve heard some developers say that <strong>int</strong> represents a 32-bit integer when the application is running on a 32-bit OS and that it represents a 64-bit integer when the application is running on a 64-bit OS. This statement is absolutely false: in C#, an <strong>int</strong> always maps to <strong>System.Int32</strong>, and therefore it represents a 32-bit integer regardless of the OS the code is running on. If programmers would use <strong>Int32</strong> in their code, then this potential confusion is also eliminated.</p></li> <li><p>In C#, <strong>long</strong> maps to <strong>System.Int64</strong>, but in a different programming language, <strong>long</strong> could map to an <strong>Int16</strong> or <strong>Int32</strong>. In fact, C++/CLI does treat <strong>long</strong> as an <strong>Int32</strong>. Someone reading source code in one language could easily misinterpret the code’s intention if he or she were used to programming in a different programming language. In fact, most languages won’t even treat <strong>long</strong> as a keyword and won’t compile code that uses it.</p></li> <li><p>The FCL has many methods that have type names as part of their method names. For example, the <strong>BinaryReader</strong> type offers methods such as <strong>ReadBoolean</strong>, <strong>ReadInt32</strong>, <strong>ReadSingle</strong>, and so on, and the <strong>System.Convert</strong> type offers methods such as <strong>ToBoolean</strong>, <strong>ToInt32</strong>, <strong>ToSingle</strong>, and so on. Although it’s legal to write the following code, the line with <strong>float</strong> feels very unnatural to me, and it’s not obvious that the line is correct:</p> <pre><code>BinaryReader br = new BinaryReader(...); float val = br.ReadSingle(); // OK, but feels unnatural Single val = br.ReadSingle(); // OK and feels good </code></pre></li> <li><p>Many programmers that use C# exclusively tend to forget that other programming languages can be used against the CLR, and because of this, C#-isms creep into the class library code. For example, Microsoft’s FCL is almost exclusively written in C# and developers on the FCL team have now introduced methods into the library such as <strong>Array</strong>’s <strong>GetLongLength</strong>, which returns an <strong>Int64</strong> value that is a <strong>long</strong> in C# but not in other languages (like C++/CLI). Another example is <strong>System.Linq.Enumerable</strong>’s <strong>LongCount</strong> method.</p></li> </ul> </blockquote>
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    1. POC# - StyleCop - SA1121: UseBuiltInTypeAlias - Readability Rules
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    1. USAndrew Savinykh
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    1. COConsider using blockquotes to indicate what *exactly* is a quote from the book, and what is your original content.
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    2. CO@Cody Gray: feel free to edit. I spent around an hour and a half typing this and formatting the text. The result that you see is the best I could come up with. I clearly indicated in the text that the quote goes until the end of the answer. If you feel that you can improve this, please edit the answer.
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    3. CO@Cody Gray: I basically don't know how to use block quote so that all the rest of the formatting (bullet list, code highlighting, etc) are retained. If you can show me, I can use it in the future.
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