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3069824
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0
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2010-06-18T13:07:56.657
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2010-06-18T13:13:05.850
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2010-06-18T13:13:05.850
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Score
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text
Body
It's not a case of which is more useful... A <code>String</code> is a <code>String</code> - one or more characters next to eachother. If you want to change a string in someway, it will simply create more strings because they are <a href="http://www.yoda.arachsys.com/csharp/strings.html" rel="nofollow noreferrer">immutable</a>. A <code>StringBuilder</code> is a class which creates strings. It provides a means of constructing them without creating lots of reduntant strings in memory. The end result will always be a <code>String</code>. Don't do this <pre><code>string s = "my string"; s += " is now a little longer"; </code></pre> or <pre><code>s = s + " is now longer again"; </code></pre> That would create 5 strings in memory (in reality, see below). Do this: <pre><code>StringBuilder sb = new StringBuilder(); sb.Append("my string"); sb.Append(" is now a little longer"); sb.Append(" is now longer again"); string s = sb.ToString(); </code></pre> That would create 1 string in memory (again, see below). You can do this: <pre><code>string s = "It is now " + DateTime.Now + "."; </code></pre> This only creates 1 string in memory. As a side-note, creating a <code>StringBuilder</code> does take a certain amount of memory anyway. As a rough rule of thumb: <ul> <li>Always use a <code>StringBuilder</code> if you're concatenating strings in a loop.</li> <li>Use a <code>StringBuilder</code> if you're concatenating a string more than 4 times.</li> </ul>
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1. POWhere are strings more useful than a StringBuilder?
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1. USDavid Neale
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1. USDavid Neale
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1. POWhere are strings more useful than a StringBuilder?
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1. COstring.Concat is also a viable solution to your example. `string s = string.Concat("my string", "is now a little longer", "is now longer again");`
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2. COGood point. I guess that's a matter of taste.
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 USDavid Neale

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