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POSpring.Caching.AspNetCache - Condition based on ReturnValue - Condition in Spring Expression Language
 

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    <p>I use Cache Aspect with ASP.NET Cache. I need create condition based on ReturnValue.</p> <p>I simplified my problem. I use CacheResult aspect on method wich return simple POCO object.</p> <p>Here is definition:</p> <pre class="lang-cs prettyprint-override"><code>public class MyData { public string MyProperty { get; set; } } public class MyResponse { public int MyId { get; set; } public MyData [] Result { get; set; } } </code></pre> <p>I need create condition for cache - Cache result only if MyResponse.MyData.Lenght is bigger then batch limit.</p> <pre class="lang-cs prettyprint-override"><code>[CacheResult("AspNetCache", "'MyResponse.MyId=' + #id", Condition = "MyResponse.Result.Length &gt; #batchLimit")] public MyResponse GetResponse(int id, int batchLimit) { Thread.Sleep(5000); return new MyResponse { MyId = 1, Result = new MyData[] { new MyData {MyProperty = "A"}, new MyData {MyProperty = "B"}, new MyData {MyProperty = "C"}, } }; } </code></pre> <p>I tried this definition of condition:</p> <pre><code>Condition = "MyResponse.Result.Length &gt; #batchLimit" </code></pre> <p>I got this error:</p> <blockquote> <p>'MyResponse' node cannot be resolved for the specified context [Sample.MyResponse].</p> </blockquote> <p>So I tried second version:</p> <pre><code>Condition = "'MyResponse.Result.Length' &gt; #batchLimit" </code></pre> <p>Finished with error:</p> <pre><code>Cannot compare instances of [System.String] and [System.Int32] because they cannot be coerced to the same type. </code></pre> <p>I google it I can use keyword <code>ReturnValue</code> something like this:</p> <pre><code>Condition = "#ReturnValue != null" </code></pre> <p>But I don't know how I can access to <code>MyResponse.MyData.Length</code>.</p>
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