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POWhat does the error "Extension method must be static" mean?
 

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  1. POWhat does the error "Extension method must be static" mean?
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    <p>I'm having trouble with this class, in particular the method:</p> <pre><code>public IQueryable&lt;T&gt; ExecuteOrderBys&lt;T&gt;(this IQueryable&lt;T&gt; source) </code></pre> <p>It says the error:</p> <blockquote> <p>Extension method must be static</p> </blockquote> <p>However when I made the method static, it throws other areas, specifically to <code>this.xxx</code> can't be accessed in a static method.</p> <p>I'm a bit confused about the return types with <code>&lt;T&gt;</code> and the return types, if someone could explain it to me and how it works I would be grateful.</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Collections; /// &lt;summary&gt; /// A collection of order bys /// &lt;/summary&gt; public class OrderByCollection { private ArrayList Orderings = new ArrayList(); public int? Skip { get; set; } public int? Take { get; set; } public OrderByCollection() { // Default skip and takes to nulls so we know if they are set or not this.Skip = null; this.Take = null; } /// &lt;summary&gt; /// Add an order by to this collection /// &lt;/summary&gt; public void AddOrderBy(string Field, bool Descending) { OrderByObj NewObj = new OrderByObj(Descending, Field); this.Orderings.Add(NewObj); } /// &lt;summary&gt; /// Executes the order bys /// &lt;/summary&gt; public IQueryable&lt;T&gt; ExecuteOrderBys&lt;T&gt;(this IQueryable&lt;T&gt; source) { int ExecutionIndex = 0; foreach (OrderByObj O in this.Orderings) { if (ExecutionIndex == 0) { if (O.Descending) source = LinqHelper.OrderByDescending(source, O.Field); else source = LinqHelper.OrderBy(source, O.Field); } else { if (O.Descending) source = LinqHelper.ThenByDescending((IOrderedQueryable&lt;T&gt;)source, O.Field); else source = LinqHelper.ThenBy((IOrderedQueryable&lt;T&gt;)source, O.Field); } ExecutionIndex++; } // Skip and take if (this.Skip != null) source = source.Skip(this.Skip.Value); if (this.Take != null) source = source.Take(this.Take.Value); return (IOrderedQueryable&lt;T&gt;)source; } } </code></pre> <p><strong>Edit</strong></p> <p>I'm trying to make a class that can do the following:</p> <pre><code>var q = db.tblJobHeaders; OrderByCollection OBys = new OrderByCollection(); OBys.AddOrderBy("some field", true); OBys.AddOrderBy("anotherfield", false); OBys.ExecuteOrderBys(q); </code></pre>
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    1. USZach Smith
    1. USTom Gullen
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      1. POWhat does the error "Extension method must be static" mean?
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    1. COHi Tom, Can you please post the code for ExecuteOrderBys?
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      1. POWhat does the error "Extension method must be static" mean?
      1. USApoorv Khurasia
    2. COThis is the same issue you just asked about: http://stackoverflow.com/questions/6096299/extension-methods-must-be-defined-in-a-non-generic-static-class - yes, different classes, but essentially the same issue.
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      1. POWhat does the error "Extension method must be static" mean?
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    3. CO@Oded: There the issue was in non-static class, here - in non-static method. Both compiler error are quite informative, btw.
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      1. USabatishchev
 

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