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POExtension methods must be defined in a non-generic static class
 

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  1. POExtension methods must be defined in a non-generic static class
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    <p>I'm getting the error:</p> <blockquote> <p>Extension methods must be defined in a non-generic static class</p> </blockquote> <p>On the line:</p> <pre><code>public class LinqHelper </code></pre> <p>Here is the helper class, based on Mark Gavells code. I'm really confused as to what this error means as I am sure it was working fine when I left it on Friday!</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Linq.Expressions; using System.Reflection; /// &lt;summary&gt; /// Helper methods for link /// &lt;/summary&gt; public class LinqHelper { public static IOrderedQueryable&lt;T&gt; OrderBy&lt;T&gt;(this IQueryable&lt;T&gt; source, string property) { return ApplyOrder&lt;T&gt;(source, property, "OrderBy"); } public static IOrderedQueryable&lt;T&gt; OrderByDescending&lt;T&gt;(this IQueryable&lt;T&gt; source, string property) { return ApplyOrder&lt;T&gt;(source, property, "OrderByDescending"); } public static IOrderedQueryable&lt;T&gt; ThenBy&lt;T&gt;(this IOrderedQueryable&lt;T&gt; source, string property) { return ApplyOrder&lt;T&gt;(source, property, "ThenBy"); } public static IOrderedQueryable&lt;T&gt; ThenByDescending&lt;T&gt;(this IOrderedQueryable&lt;T&gt; source, string property) { return ApplyOrder&lt;T&gt;(source, property, "ThenByDescending"); } static IOrderedQueryable&lt;T&gt; ApplyOrder&lt;T&gt;(IQueryable&lt;T&gt; source, string property, string methodName) { string[] props = property.Split('.'); Type type = typeof(T); ParameterExpression arg = Expression.Parameter(type, "x"); Expression expr = arg; foreach (string prop in props) { // use reflection (not ComponentModel) to mirror LINQ PropertyInfo pi = type.GetProperty(prop); expr = Expression.Property(expr, pi); type = pi.PropertyType; } Type delegateType = typeof(Func&lt;,&gt;).MakeGenericType(typeof(T), type); LambdaExpression lambda = Expression.Lambda(delegateType, expr, arg); object result = typeof(Queryable).GetMethods().Single( method =&gt; method.Name == methodName &amp;&amp; method.IsGenericMethodDefinition &amp;&amp; method.GetGenericArguments().Length == 2 &amp;&amp; method.GetParameters().Length == 2) .MakeGenericMethod(typeof(T), type) .Invoke(null, new object[] { source, lambda }); return (IOrderedQueryable&lt;T&gt;)result; } } </code></pre>
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