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POReturning an ArrayList from an ASMX Service
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copied!<p>I have a couple of questions regarding Web Services, and I would really appreciate if someone could point me in the right direction.</p> <p>In my class library, I have a two classes: Hotel & RoomType. Hotel class contains an ArrayList of RoomType objects.</p> <p>In my Web Service, I have a GetHotels method as follows:</p> <pre><code>[WebMethod] [XmlInclude(typeof(Hotel))] [XmlInclude(typeof(RoomType))] public ArrayList GetHotels() { return Sistema.GetInstance().GetHotels(); } </code></pre> <p>GetHotels() in class Sistema, retrieves the information from the database and returns an ArrayList. </p> <p>I had to use XMLInclude because I was getting:</p> <blockquote> <p>The type Hotel (or RoomType) was not expected. Use the XmlInclude or SoapInclude attribute to specify types that are not known statically</p> </blockquote> <p>Then in my Web app I have this code:</p> <pre><code>WebService sample = new Service(); ArrayList hotels = service.GetHotels(); </code></pre> <p>This doesn't compile, so I had to change to the following code:</p> <pre><code>WebService sample = new Service(); object[] hotels = service.GetHotels(); </code></pre> <p>Here's my first question: <strong>Is it possible to return an ArrayList, or every time I will have to cast the result to an ArrayList?</strong></p> <p>Knowing that the ArrayList contains Hotel objects, I added the following code:</p> <pre><code>foreach (Hotel hotel in hotels) { ... } </code></pre> <p>This compiles, but when I execute, I get the following error:</p> <blockquote> <p>Unable to cast object of type 'System.Xml.XmlNode[]' to type 'Hotel'.</p> </blockquote> <p>So, my next question is: <strong>How can I cast the result to a Hotel object and work with it?</strong></p>

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