Track progress when using TPL's Parallel.ForEach

Question

What is the best way way to track progress in the following

long total = Products.LongCount();
long current = 0;
double Progress = 0.0;

Parallel.ForEach(Produc         


        

Answer 1

A solution without using any blocking in the body:

long total = Products.LongCount();
BlockingCollection states = new BlockingCollection();

Parallel.ForEach(Products, () =>
{
    MyState myState = new MyState();
    states.Add(myState);
    return myState;
},
(i, state, arg3, myState) =>
{
    try
    {
        var price = GetPrice(SystemAccount, product);
        SavePrice(product,price);
    }
    finally
    {
        myState.value++;
        return myState;
    }
},
i => { }
);

Then, to access the current progress:

(float)states.Sum(state => state.value) / total