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    <p>The Mongo Id is not a "string" and the Mongo.Bson library will not serialize it to a string automatically. If you are using the Mongo.Bson library, you need to set the id property on your class to be a ObjectId type which is available in that library.</p> <p>The problem here is that the .net serializer doesn't know how to serialize the custom type ObjectId that's the mongo built in Id (not sure why). It is not marked as [Serializable] so you have to get ASP.NET to bypass it or create another class that doesn't have one and convert it to a string.</p> <p>If you need a string to use in your app, you should disable the serialization of the MongoId to xml (if that's what you're trying to do), then you can add a property like this to your class:</p> <pre><code>[XmlIgnore] public ObjectId _id { get; set; } public string MongoId { get { return _id.ToString(); } set { _id = ObjectId.Parse(value); } } </code></pre> <p>The alternative it to create a seperate mapped class to manage the return data.</p> <p>EDIT In that case you should use the "opt-in" approach. This involves decorating your class to look like the following:</p> <pre><code>[DataContract] public class Document { public ObjectId _id { get; set; } [DataMember] public string MongoId { get { return _id.ToString(); } set { _id = ObjectId.Parse(value); } } </code></pre> <p>...</p> <p>DataMember will flag only those properties for serialization. Are you using POCO classes for your "Document" object? If so the above should work fine.</p> <p>I would however recommend creating a mapped view of the "Document" object for passing out publically. In these situations youalmost always end up wanting a slightly different "contract" to your actual database entity</p>
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    1. COI have edited the question and added my connection. I would like to return the result of the FindAll to Json.
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    2. COHow would you suggest I create a mapped view of the Document? with an interface? or is that a stupid question?
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    3. CONot at all, there's loads of ways to do it, and hard to advise without seeing the structure of your solution in VS. A contracts folder with classes you map to is always a good one. A contract is it's own class and you can map it with linq ...Select(x => new DocumentContract() { MongoId = ObjectId.ToString(), A = x.A, B = x.B ... etc or a tool like Automapper if you have a lot of different classes.
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