Triton160/Common/DataAnalysisControl/Charting/Command/RemoveDataSourceCommand.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Input;

using Aitex.UI.Charting.ViewModel;
using System.Windows;
using Aitex.UI.Charting.View;
using DataAnalysisControl.Core;

namespace Aitex.UI.Charting.Command
{
    public class RemoveDataSourceCommand : ICommand
    {
        public RemoveDataSourceCommand(string sourceName)
        {
            _sourceName = sourceName;
        }

        string _sourceName;

        public bool CanExecute(object parameter)
        {
            return true;
        }

#pragma warning disable 0067
        public event EventHandler CanExecuteChanged;
#pragma warning restore 0067

        private void AsyncShowWarningMessageBox(string message, string title)
        {
            Application.Current.Dispatcher.BeginInvoke(new Action(() => MessageBox.Show(message, title, MessageBoxButton.OK, MessageBoxImage.Warning)));
        }

        public void Execute(object parameter)
        {
            string reason = string.Empty;
            try
            {
                var commonViewModel = (CommonViewModel)parameter;
                if (string.IsNullOrEmpty(_sourceName))
                {
                    foreach (var ds in commonViewModel.DataSources)
                    {
                        ds.Value.Dispose();//释放每个datasource对象资源
                    }
                    commonViewModel.DataSources.Clear();
                    commonViewModel.RenderableSeries.Clear();
                    //commonViewModel.ChartDataDic.Clear();
                    //commonViewModel.ChartDataSets.Clear();
                }
                else
                {
                    for (int i = 0; i < commonViewModel.RenderableSeries.Count; i++)
                    {
                        var line = commonViewModel.RenderableSeries[i] as MyLineSeries;
                        if (line.DataSource.Title == _sourceName)
                        {
                            (new RemoveDataSeriesCommand(line.UniqueId)).Execute(commonViewModel);
                            i = -1; //reset counter
                        }
                    }
                    if (commonViewModel.DataSources.Keys.Contains(_sourceName))
                    {
                        commonViewModel.DataSources[_sourceName].Dispose();//释放指定datasource对象的资源
                        commonViewModel.DataSources.Remove(_sourceName);
                    }                    
                }
                commonViewModel.InvokePropertyChanged();
                GC.Collect();
            }
            catch (Exception ex)
            {
                reason = string.Format("删除数据源{0}出错", _sourceName);
                CONTEXT.WriteLog(ex, reason);
                AsyncShowWarningMessageBox(reason, "警告");
            }
        }
    }
}