CosmosLinqSerializer Class

Reference

Definition

Namespace:: Microsoft.Azure.Cosmos

Assembly:: Microsoft.Azure.Cosmos.Client.dll

Package:: Microsoft.Azure.Cosmos v3.45.0

Source:: CosmosLinqSerializer.cs

Important

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This abstract class can be implemented to allow a custom serializer (Non Json.NET serializer's) to be used by the CosmosClient for LINQ queries.

public abstract class CosmosLinqSerializer : Microsoft.Azure.Cosmos.CosmosSerializer

type CosmosLinqSerializer = class
    inherit CosmosSerializer

Public MustInherit Class CosmosLinqSerializer
Inherits CosmosSerializer

Inheritance: Object

CosmosSerializer
CosmosLinqSerializer

Examples

This example implements the CosmosLinqSerializer contract. This example custom serializer will honor System.Text.Json attributes.

class SystemTextJsonSerializer : CosmosLinqSerializer
{
   private readonly JsonObjectSerializer systemTextJsonSerializer;

   public SystemTextJsonSerializer(JsonSerializerOptions jsonSerializerOptions)
   {
       this.systemTextJsonSerializer = new JsonObjectSerializer(jsonSerializerOptions);
   }

   public override T FromStream<T>(Stream stream)
   {
       if (stream == null)
           throw new ArgumentNullException(nameof(stream));

       using (stream)
       {
           if (stream.CanSeek && stream.Length == 0)
           {
               return default;
           }

           if (typeof(Stream).IsAssignableFrom(typeof(T)))
           {
               return (T)(object)stream;
           }

           return (T)this.systemTextJsonSerializer.Deserialize(stream, typeof(T), default);
       }
   }

   public override Stream ToStream<T>(T input)
   {
       MemoryStream streamPayload = new MemoryStream();
       this.systemTextJsonSerializer.Serialize(streamPayload, input, input.GetType(), default);
       streamPayload.Position = 0;
       return streamPayload;
   }

   public override string SerializeMemberName(MemberInfo memberInfo)
   {
       System.Text.Json.Serialization.JsonExtensionDataAttribute jsonExtensionDataAttribute =
            memberInfo.GetCustomAttribute<System.Text.Json.Serialization.JsonExtensionDataAttribute>(true);
       if (jsonExtensionDataAttribute != null)
       {
            return null;
       }

       JsonPropertyNameAttribute jsonPropertyNameAttribute = memberInfo.GetCustomAttribute<JsonPropertyNameAttribute>(true);

       string memberName = !string.IsNullOrEmpty(jsonPropertyNameAttribute?.Name)
           ? jsonPropertyNameAttribute.Name
           : memberInfo.Name;

       // Users must add handling for any additional attributes here

       return memberName;
   }
}

Remarks

Refer to the sample project for a full implementation.

Constructors

CosmosLinqSerializer()

Methods

FromStream<T>(Stream)	Convert a Stream of JSON to an object. The implementation is responsible for Disposing of the stream, including when an exception is thrown, to avoid memory leaks. (Inherited from CosmosSerializer)
SerializeMemberName(MemberInfo)	Convert a MemberInfo to a string for use in LINQ query translation. This must be implemented when using a custom serializer for LINQ queries.
ToStream<T>(T)	Convert the object to a Stream. The caller will take ownership of the stream and ensure it is correctly disposed of. Stream.CanRead must be true. (Inherited from CosmosSerializer)

Applies to

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