VS11 style async wrapper for the OData async model

Using the previous post we can now write wrap all asynchronous functions written using the APM pattern into tasks. This is the preferred way to write the asynchronous code in C#5.

Here is the list of async extension wrappers for all asynchronous methods used with the OData for TFS series.

namespace DataServiceAsyncExtensions
{
    using System;
    using System.Collections.Generic;
    using System.Data.Services.Client;
    using System.Threading.Tasks;

    public static class DataServiceQueryExtensions
    {
        public static Task<IEnumerable<T>> ExecuteAsync<T>(this DataServiceQuery<T> query, object state)
        {
            return Task.Factory.FromAsync<IEnumerable<T>>(query.BeginExecute, query.EndExecute, state);
        }
    }

    public static class DataServiceContextExtensions
    {
        public static Task<IEnumerable<T>> ExecuteAsync<T>(this DataServiceContext context, DataServiceQueryContinuation<T> continuation, object state)
        {
            return Task.Factory.FromAsync<DataServiceQueryContinuation<T>, IEnumerable<T>>(context.BeginExecute<T>, context.EndExecute<T>, continuation, state);
        }

        public static Task<IEnumerable<T>> ExecuteAsync<T>(this DataServiceContext context, Uri requestUri, object state)
        {
            return Task.Factory.FromAsync<Uri, IEnumerable<T>>(context.BeginExecute<T>, context.EndExecute<T>, requestUri, state);
        }

        public static Task<DataServiceResponse> ExecuteBatchAsync(this DataServiceContext context, object state, params DataServiceRequest[] queries)
        {
            if (context == null)
                throw new ArgumentNullException("context");
            return Task.Factory.FromAsync<DataServiceResponse>(context.BeginExecuteBatch(null, state, queries), context.EndExecuteBatch);
        }

        public static Task<DataServiceStreamResponse> GetReadStreamAsync(this DataServiceContext context, object entity, DataServiceRequestArgs args, object state)
        {
            return Task.Factory.FromAsync<object, DataServiceRequestArgs, DataServiceStreamResponse>(context.BeginGetReadStream, context.EndGetReadStream, entity, args, state);
        }

        public static Task<QueryOperationResponse> LoadPropertyAsync(this DataServiceContext context, object entity, string propertyName, object state)
        {
            return Task.Factory.FromAsync<object, string, QueryOperationResponse>(context.BeginLoadProperty, context.EndLoadProperty, entity, propertyName, state);
        }

        public static Task<QueryOperationResponse> LoadPropertyAsync(this DataServiceContext context, object entity, string propertyName, DataServiceQueryContinuation continuation, object state)
        {
            return Task.Factory.FromAsync<object, string, DataServiceQueryContinuation, QueryOperationResponse>(context.BeginLoadProperty, context.EndLoadProperty, entity, propertyName, continuation, state);
        }

        public static Task<QueryOperationResponse> LoadPropertyAsync(this DataServiceContext context, object entity, string propertyName, Uri nextLinkUri, object state)
        {
            return Task.Factory.FromAsync<object, string, Uri, QueryOperationResponse>(context.BeginLoadProperty, context.EndLoadProperty, entity, propertyName, nextLinkUri, state);
        }

        public static Task<DataServiceResponse> SaveChangesAsync(this DataServiceContext context, object state)
        {
            return Task.Factory.FromAsync<DataServiceResponse>(context.BeginSaveChanges, context.EndSaveChanges, state);
        }

        public static Task<DataServiceResponse> SaveChangesAsync(this DataServiceContext context, SaveChangesOptions options, object state)
        {
            return Task.Factory.FromAsync<SaveChangesOptions, DataServiceResponse>(context.BeginSaveChanges, context.EndSaveChanges, options, state);
        }
    }
}

The code is also available on github or you can download it from the link.

Last updated by at .

  • http://twitter.com/JeffFattic Jeff Fattic

    why are you not using the async and await keywords?