C#: Async ParallelForEach

Here's an example of using ParalleForEach Async in C#

Reference: C#: ParallelForEachAsync by Alexandru Puiu

        /// <summary>

        /// Extension method for ParallelForEachAsync
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="source"></param>
        /// <param name="dop"></param>
        /// <param name="body"></param>
        /// <returns></returns>
        public static Task ParallelForEachAsync<T>(this IEnumerable<T> source, int dop, Func<T, Task> body)
        {
            async Task AwaitPartition(IEnumerator<T> partition)
            {
                using (partition)
                {
                    while (partition.MoveNext())
                    { await body(partition.Current); }
                }
            }

            return Task.WhenAll(
                Partitioner
                    .Create(source)
                    .GetPartitions(dop)
                    .AsParallel()
                    .Select(p => AwaitPartition(p)));

        }

Usage:

#region Extension method for ParallelForEachAsync: usage
       
        //await GetDocumentsFromDatabase(session).ForEachAsync(dop: 20, body: async entry =>
        //{
        //    _logger.Info($"Processing entry '{entry.Id}'");
        //});

#endregion

Fastest way to read files

http://cc.davelozinski.com/c-sharp/the-fastest-way-to-read-and-process-text-files

A good post on how to write DAL

http://rlacovara.blogspot.in/2009/02/high-performance-data-access-layer.html

7 ways to start a Task in .NET C#

http://dotnetcodr.com/2014/01/01/5-ways-to-start-a-task-in-net-c/

Generate a comma separated string from an IEnumerable object

string.join(",", Contacts.Select(x=>x.Name); //Name is a property of an object(Contact) in the list of Contacts

Simple yet effective way to find if IEnumerable has elements or not

bool IsEmpty(IEnumerable en)
{
    foreach(var c in en) { return false; }
    return true;
}

C# code to get numbers after decimal point

int decimalPoints=BitConverter.GetBytes(Decimal.GetBits(value)[3])[2];

Great example of async and await

http://blog.roboblob.com/2014/10/23/awaiting-for-that-button-click/

Enums as bitarray

http://blog.falafel.com/entity-framework-enum-flags/

Threading concepts explained in detail

http://www.codeproject.com/Articles/821074/Net-Threading-You-Need-To-Know

Asynchronous Tasks Simplified

Superb article and nice explanation
http://visualstudiomagazine.com/articles/2014/08/01/manage-asynchronous-tasks.aspx

Implement IEquatable in a Generic Type

http://csharp.2000things.com/2014/07/22/1143-implement-iequatable-in-a-generic-type/

How to Concatenate Collections into Strings

http://visualstudiomagazine.com/blogs/tool-tracker/2014/06/join-collections-into-strings.aspx