private void RefreshButton_Click(object sender, EventArgs e)
        {
            RefreshButton.Text    = "正在刷新 ...";
            RefreshButton.Enabled = false;

            AccessibleListBox.Items.Clear();
            foreach (var TIMwindow in TIMHelper.GetTIMHandles())
            {
                TIMHelper TIMhelper = new TIMHelper(TIMwindow.Handle);
                AccessibleListBox.Items.Add(TIMhelper);
            }

            RefreshButton.Text    = "刷新";
            RefreshButton.Enabled = true;
        }
        private void AccessibleListBox_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (AccessibleListBox.SelectedItems.Count < 1)
            {
                return;
            }
            TIMHelper helper = AccessibleListBox.SelectedItem as TIMHelper;

            if (helper == null)
            {
                return;
            }

            ContactTreeView.Nodes.Clear();
            foreach (string key in helper.Contacts.Keys)
            {
                TreeNode GroupNode = new TreeNode($"{key}  ({helper.Contacts[key].Count} 个联系人)")
                {
                    Name = key, BackColor = Color.WhiteSmoke
                };
                foreach (IAccessible Contact in helper.Contacts[key])
                {
                    if (Contact == null)
                    {
                        GroupNode.Nodes.Add("<未知联系人>");
                    }
                    else
                    {
                        GroupNode.Nodes.Add(Contact.accName[0], $"<{Contact.accName[0]}> - 签名: {Contact.accValue[0]}");
                    }
                }
                ContactTreeView.Nodes.Add(GroupNode);
            }

            SessionListBox.Items.Clear();
            foreach (IAccessible session in helper.Sessions)
            {
                SessionListBox.Items.Add($"<{session.accName[0]}> - Message: {session.accValue[0]}");
            }
        }