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PODeserialization Error ASP.NET MongoDB
 

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    <p>I am trying to retireve all the documents in my MongoDB collection via a REST api built in ASP.NET MVC 4 and I have encoutered an error when i enter localhost:50491/api/document:</p> <blockquote> <p>An error occurred while deserializing the Id property of class Acord_Rest_API.Models.Document: Cannot deserialize string from BsonType ObjectId.</p> </blockquote> <p>My controller looks like:</p> <pre><code>public class DocumentController : ApiController { public readonly MongoConnectionHelper&lt;Document&gt; docs; public DocumentController() { docs = new MongoConnectionHelper&lt;Document&gt;(); } public IList&lt;Document&gt; getAllDocs() { var alldocs = docs.collection.FindAll(); return alldocs.ToList(); } } </code></pre> <p>My MongoDB document looks like this? <img src="https://i.stack.imgur.com/x627q.png" alt="enter image description here"></p> <p>What am I missing here?</p> <p>My class that connects to the DB:</p> <pre><code>public class MongoConnectionHelper&lt;T&gt; where T: class { public MongoCollection&lt;T&gt; collection { get; private set; } public MongoConnectionHelper() { string connectionString = "mongodb://127.0.0.1"; var server = MongoServer.Create(connectionString); if (server.State == MongoServerState.Disconnected) { server.Connect(); } var conn = server.GetDatabase("Acord"); collection = conn.GetCollection&lt;T&gt;("Mappings"); } } </code></pre> <p>EDIT here is my solution: <img src="https://i.stack.imgur.com/pWmum.png" alt="enter image description here"></p> <p>MongoConnectionHelper does the connection to the DB, DocumentController has the methods to retrive all the documents and Document contains what you have suggested in your answer.</p> <p>EDIT here is the Document class:</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); } } public IList&lt;string&gt; alldocs { get; set; } } </code></pre>
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