Adding to a list in a Parallel.ForEach loop in a threadsafe manner

Question

I have a bit of code that works like this on a list of obj objects called ListofObjects:

List NewListofObjects();

Parall         


        

Answer 1

The .NET Framework 4 introduces the System.Collections.Concurrent namespace, which includes several collection classes that are both thread-safe and scalable. https://docs.microsoft.com/en-us/dotnet/standard/collections/thread-safe/

BlockingCollection[] sourceArrays = new BlockingCollection[5];
for (int i = 0; i < sourceArrays.Length; i++)
    sourceArrays[i] = new BlockingCollection(500);
Parallel.For(0, sourceArrays.Length * 500, (j) =>
{
    int k = BlockingCollection.TryAddToAny(sourceArrays, j);
    if (k >= 0)
        Console.WriteLine("added {0} to source data", j);
});