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    <p><strong>Performance Benchmarks</strong></p> <pre><code>Catch exception: 10,000 good: 63,668 ticks 10,000 bad: 6,435,609 ticks Regex Pre-Screen: 10,000 good: 637,633 ticks 10,000 bad: 717,894 ticks COM Interop CLSIDFromString 10,000 good: 126,120 ticks 10,000 bad: 23,134 ticks </code></pre> <p><strong>COM Intertop (Fastest) Answer:</strong></p> <pre><code>/// &lt;summary&gt; /// Attempts to convert a string to a guid. /// &lt;/summary&gt; /// &lt;param name="s"&gt;The string to try to convert&lt;/param&gt; /// &lt;param name="value"&gt;Upon return will contain the Guid&lt;/param&gt; /// &lt;returns&gt;Returns true if successful, otherwise false&lt;/returns&gt; public static Boolean TryStrToGuid(String s, out Guid value) { //ClsidFromString returns the empty guid for null strings if ((s == null) || (s == "")) { value = Guid.Empty; return false; } int hresult = PInvoke.ObjBase.CLSIDFromString(s, out value); if (hresult &gt;= 0) { return true; } else { value = Guid.Empty; return false; } } namespace PInvoke { class ObjBase { /// &lt;summary&gt; /// This function converts a string generated by the StringFromCLSID function back into the original class identifier. /// &lt;/summary&gt; /// &lt;param name="sz"&gt;String that represents the class identifier&lt;/param&gt; /// &lt;param name="clsid"&gt;On return will contain the class identifier&lt;/param&gt; /// &lt;returns&gt; /// Positive or zero if class identifier was obtained successfully /// Negative if the call failed /// &lt;/returns&gt; [DllImport("ole32.dll", CharSet = CharSet.Unicode, ExactSpelling = true, PreserveSig = true)] public static extern int CLSIDFromString(string sz, out Guid clsid); } } </code></pre> <hr> <p>Bottom line: If you need to check if a string is a guid, and you care about performance, use COM Interop. </p> <p>If you need to convert a guid in String representation to a Guid, use</p> <pre><code>new Guid(someString); </code></pre>
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    1. USIan Boyd
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    1. COUpvoting to cancel the stupidest downvote I've ever seen.
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    2. CONow that's some good info.
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      1. USMike Cole
    3. CODid you run these with debugger on or off? The performance of exception throwing is improved by several-fold without attaching the debugger.
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