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    <p>I have solved the immediate issue by contruction a set of class that allowed for the generation of the following query:</p> <pre><code>{ 'Relationships': { $all: [ {$elemMatch: {'RelationshipType':'Student', 'Attributes.Institution': 'Test1'}}, {$elemMatch: {'RelationshipType':'Staff', 'Attributes.Institution': 'Test2'}} ] } } </code></pre> <p>Here are the class definitions:</p> <pre><code>class MongoQueryAll { public string Name { get; set; } public List&lt;MongoQueryElement&gt; QueryElements { get; set; } public MongoQueryAll(string name) { Name = name; QueryElements = new List&lt;MongoQueryElement&gt;(); } public override string ToString() { string qelems = ""; foreach (var qe in QueryElements) qelems = qelems + qe + ","; string query = String.Format(@"{{ ""{0}"" : {{ $all : [ {1} ] }} }}", this.Name, qelems); return query; } } class MongoQueryElement { public List&lt;MongoQueryPredicate&gt; QueryPredicates { get; set; } public MongoQueryElement() { QueryPredicates = new List&lt;MongoQueryPredicate&gt;(); } public override string ToString() { string predicates = ""; foreach (var qp in QueryPredicates) { predicates = predicates + qp.ToString() + ","; } return String.Format(@"{{ ""$elemMatch"" : {{ {0} }} }}", predicates); } } class MongoQueryPredicate { public string Name { get; set; } public object Value { get; set; } public MongoQueryPredicate(string name, object value) { Name = name; Value = value; } public override string ToString() { if (this.Value is int) return String.Format(@" ""{0}"" : {1} ", this.Name, this.Value); return String.Format(@" ""{0}"" : ""{1}"" ", this.Name, this.Value); } } </code></pre> <p>Helper Search Class:</p> <pre><code>public class IdentityAttributeSearch { public string Name { get; set; } public object Datum { get; set; } public string RelationshipType { get; set; } } </code></pre> <p>Example Usage:</p> <pre><code> public List&lt;IIdentity&gt; FindIdentities(List&lt;IdentityAttributeSearch&gt; searchAttributes) { var server = MongoServer.Create("mongodb://localhost/"); var db = server.GetDatabase("IdentityManager"); var collection = db.GetCollection&lt;MongoIdentity&gt;("Identities"); MongoQueryAll qAll = new MongoQueryAll("Relationships"); foreach (var search in searchAttributes) { MongoQueryElement qE = new MongoQueryElement(); qE.QueryPredicates.Add(new MongoQueryPredicate("RelationshipType", search.RelationshipType)); qE.QueryPredicates.Add(new MongoQueryPredicate("Attributes." + search.Name, search.Datum)); qAll.QueryElements.Add(qE); } BsonDocument doc = MongoDB.Bson.Serialization .BsonSerializer.Deserialize&lt;BsonDocument&gt;(qAll.ToString()); var identities = collection.Find(new QueryComplete(doc)).ToList(); return identities; } </code></pre> <p>I am sure there is a much better way but this worked for now and appears to be flexible enough for my needs. All suggestions are welcome.</p> <p>This is probably a separate question but for some reason this search can take up to 24 seconds on a document set of 100,000. I have tried adding various indexes but to no avail; any pointers in this regards would be fabulous.</p>
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    1. POHow can I 'AND' multiple $elemMatch clauses with C# and MongoDB?
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    1. POHow can I 'AND' multiple $elemMatch clauses with C# and MongoDB?
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