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POXML Serialize generic list of serializable objects
 

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    <p>Can I serialize a generic list of serializable objects without having to specify their type.</p> <p>Something like the intention behind the broken code below:</p> <pre><code>List&lt;ISerializable&gt; serializableList = new List&lt;ISerializable&gt;(); XmlSerializer xmlSerializer = new XmlSerializer(serializableList.GetType()); serializableList.Add((ISerializable)PersonList); using (StreamWriter streamWriter = System.IO.File.CreateText(fileName)) { xmlSerializer.Serialize(streamWriter, serializableList); } </code></pre> <p>Edit:</p> <p>For those who wanted to know detail: when I try to run this code, it errors on the XMLSerializer[...] line with:</p> <p>Cannot serialize interface System.Runtime.Serialization.ISerializable.</p> <p>If I change to <code>List&lt;object&gt;</code> I get <code>"There was an error generating the XML document."</code>. The InnerException detail is <code>"{"The type System.Collections.Generic.List1[[Project1.Person, ConsoleFramework, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]] may not be used in this context."}"</code></p> <p>The person object is defined as follows:</p> <pre><code>[XmlRoot("Person")] public class Person { string _firstName = String.Empty; string _lastName = String.Empty; private Person() { } public Person(string lastName, string firstName) { _lastName = lastName; _firstName = firstName; } [XmlAttribute(DataType = "string", AttributeName = "LastName")] public string LastName { get { return _lastName; } set { _lastName = value; } } [XmlAttribute(DataType = "string", AttributeName = "FirstName")] public string FirstName { get { return _firstName; } set { _firstName = value; } } } </code></pre> <p>The PersonList is just a <code>List&lt;Person&gt;</code> .</p> <p>This is just for testing though, so didn't feel the details were too important. The key is I have one or more different objects, all of which are serializable. I want to serialize them all to one file. I thought the easiest way to do that would be to put them in a generic list and serialize the list in one go. But this doesn't work.</p> <p>I tried with <code>List&lt;IXmlSerializable&gt;</code> as well, but that fails with</p> <p><code>System.Xml.Serialization.IXmlSerializable cannot be serialized because it does not have a parameterless constructor.</code></p> <p>Sorry for the lack of detail, but I am a beginner at this and don't know what detail is required. It would be helpful if people asking for more detail tried to respond in a way that would leave me understanding what details are required, or a basic answer outlining possible directions.</p> <p>Also <strong>thanks</strong> to the two answers I've got so far - I could have spent a lot more time reading without getting these ideas. It's amazing how helpful people are on this site.</p>
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    1. USSimon D
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    1. COI have tried it, it didn't work, I can't work out how to make it work. I tried changing it to List<object>, that didn't work either.
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      1. USSimon D
    2. COIn what way did it "not work"? Give details if you want answers.
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      1. USJohn Saunders
    3. COwhat was the error you had? do all the objects implement `ISerializable` or just have the `[Serializable]` attribute?
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      1. USErich Mirabal
 

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