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Dealing with Progressive Operations

, 10 May 2010 CPOL
Through a clean OOP solution to deal with progressive operations, I will implicitly show you how OOP principles can work together to make a full, clean solution.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Erik.Utilities.Interfaces;
using Erik.Utilities.Bases;

namespace MultipleThreadsSample
    class CompositeFindInFilesPO :
        BackgroundCompositePO, IFindInFilesPO
        string _searchText;
        string _searchPath;

        List<string> _errors;

        public CompositeFindInFilesPO(
            List<IFindInFilesPO> operations,
            string searchText, string searchPath)
            : base() 
            _searchText = searchText;
            _searchPath = searchPath;

            _errors = new List<string>();

            _operations = new List<IProgressiveOperation>();
            foreach (IFindInFilesPO op in operations)
                op.FileFound += (sender, e) => OnFileFound(e);

                op.OperationEnd += (sender, e) =>
                        if (op.ErrorsInFiles.Count != 0)
                            lock (_errors)

            _totalSteps = _operations.Sum<IProgressiveOperation>(po => po.TotalSteps);

        protected virtual void OnFileFound(FileFoundEventArgs e)
            if (FileFound != null)
                FileFound(this, e);

        public string SearchText
            get { return _searchText; }

        public string SearchPath
            get { return _searchPath; }

        #region IFindInFilesPO Members

        public event FileFoundEventHandler FileFound;

        public List<string> ErrorsInFiles
                List<string> lst;

                lock (_errors)
                    lst = new List<string>(_errors);

                return lst;


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