private void LoadSessionHistoryToolStripMenuItem

private void LoadSessionHistoryToolStripMenuItem_Click()

in Tools/MultiplayerSessionHistoryViewer/Form1.cs [848:930]
71 lines of code
8 McCabe index (conditional complexity)

        private void LoadSessionHistoryToolStripMenuItem_Click(object sender, EventArgs e)
        {
            HistoricalDocument document = null;

            var openFileDialog = new OpenFileDialog()
            {
                Filter = SessionHistoryFileFilter
            };

            if (openFileDialog.ShowDialog() == DialogResult.OK)
            {
                using (StreamReader sr = new StreamReader(openFileDialog.FileName))
                {
                    string fileContents = sr.ReadToEnd();
                    try
                    {
                        document = JsonConvert.DeserializeObject<HistoricalDocument>(fileContents);
                    }
                    catch (JsonSerializationException)
                    {
                        MessageBox.Show("Could not deserialize the file to a\nHistorical Document.", "Load Document Error");
                    }
                }
            }

            if (document != null)
            {
                this.listView1.Items.Clear();
                this.InitViews();

                string[] arr = new string[QueryResultColumnCount] 
                { 
                    document.SessionName,
                    document.Branch,
                    document.NumSnapshots.ToString(),
                    document.LastModified,
                    document.IsExpired.ToString(),
                    document.ActivityId
                };

                ListViewItem lvi = new ListViewItem(arr);
                this.listView1.Items.Add(lvi);

                foreach (DocumentStateSnapshot snapshot in document.DocumentSnapshots)
                {
                    string hashKey = this.snapshotCache.GetHashString(
                        document.SessionName,
                        document.Branch,
                        snapshot.Change);

                    string snapshotBody;

                    if (snapshot.Change != SessionHistory.MaxChangeValue)
                    {
                        if (!this.snapshotCache.TryGetSnapshot(hashKey, out snapshotBody))
                        {
                            snapshotBody = snapshot.Body;
                            this.snapshotCache.AddSnapshotToCache(hashKey, snapshot.Body);
                        }
                    }

                    string[] lv2arr = new string[DocumentMetadataColumnCount] 
                        { 
                            snapshot.Change == SessionHistory.MaxChangeValue ? "expired" : snapshot.Change.ToString(),
                            snapshot.ModifiedByXuids,
                            snapshot.Timestamp.ToString(),
                            snapshot.TitleId,
                            snapshot.ServiceId,
                            snapshot.CorrelationId,
                            snapshot.ChangeDetails
                        };

                    ListViewItem lvi2 = new ListViewItem(lv2arr);
                    this.listView2.Items.Add(lvi2);
                }

                this.lblDocCount.Text = "1 document [offline]";
                this.DisplayChangesInfo();

                this.showingOfflineSession = true;
                this.saveSessionHistoryToolStripMenuItem.Visible = false;
            }
        }