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POOptimizing the Generic List WHERE
 

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    <p>The statement below takes around 6 seconds to produce the output when the SecurityInfoMasterList has around 11,000 items and listClassiNode has around 750 items. </p> <p>Is there any other way of doing this to achieve the same result but with better performance?</p> <pre><code>List&lt;SecurityInfo&gt; listSecurityInfo = SecurityInfoMasterList.Where(c =&gt; listClassiNode.Any(d =&gt; c.SX == d.Exch &amp;&amp; c.Instrument == d.Instrument)).ToList(); </code></pre> <p>I have been trying to use for loop but didnt see much improvement.</p> <p>Updated:</p> <p>listClassiNode is a List</p> <pre><code>[Serializable] public class SecurityInfo { public string SecurityID { get; set; } public int SecurityTypeID { get; set; } public string Code { get; set; } public string SecurityName { get; set; } public int DB { get; set; } public string ExchangeName { get; set; } public DateTime FirstDate { get; set; } public int StatusCode { get; set; } public long GICS { get; set; } public string ICB { get; set; } public string Sector { get; set; } public string IndustryGroup { get; set; } public string Industry { get; set; } public string Instrument { get; set; } public string TypeDescription { get; set; } public string SX { get; set; } public string GUID { get; set; } } [Serializable()] public class ClassificationNode { public string Exch { get; set; } public string Instrument { get; set; } public string Prefix { get; set; } public string Name { get; set; } public string Level { get; set; } } </code></pre> <p>Alan</p>
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    1. COcan you give more info about the object, what is SX, Exch, Intrument property?
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    2. COSX, Exch and Instrument are type of string. SecurityInfo object consists of other properties as well.
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    3. COthanks, i updated the code in my answer with your class and test scenario to play :-)
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