WPF中实现登陆窗口的“记住帐号”功能

1、在Login.xaml中添加资源：

<XmlDataProvider x:Key="XmlDataProvider" Source="pack://application:,,,/5yue.PMS;Component/Config/SysConfig.xml" XPath="SysConfig"/>

2、使用ComboBox实现帐号输入：

<ComboBox x:Name="UserName" Width="160" Height="26" FontSize="14" IsEditable="True" Grid.Row="1" Grid.Column="1" 
ItemsSource="{Binding Source={StaticResource XmlDataProvider}, XPath=SavedLoginNames/LoginName}" BorderThickness ="1" SelectedIndex="0"/>
<CheckBox x:Name="ckSaveName" FontSize="12px" Grid.Row="1" Grid.Column="2" HorizontalAlignment="Right" Margin="0,0,22,0" Padding="2 0 " Foreground="#88052742">记住我</CheckBox>

3、后台逻辑，在提交验证成功后添加保存帐号的步骤即可：

        /// <summary>
        /// 保存账号(异步执行)
        /// </summary>
        /// <param name="loginName"></param>
        private async void SaveLoginName(string loginName)
        {
            await Task.Delay(1);
            if(this.ckSaveName.IsChecked != true) return;
            try
            {                
                string filePath = Utils.GetMapPath("")+@"ConfigSysConfig.xml";                
                XmlDocument doc = XmlHelper.GetXMLDoc(filePath);
                if (doc != null)
                {
                    XmlNode rootNode = doc.SelectSingleNode("SysConfig");
                    List<string> nameList = XmlHelper.GetNodesToList(rootNode, "SavedLoginNames");
                    if (nameList != null && !nameList.Contains(loginName))// 如果账号仍未保存
                    {
                        XmlNode namesNode = rootNode.SelectSingleNode("SavedLoginNames");// 获取SavedLoginNames节点信息
                        XmlNode childNode = doc.CreateElement("LoginName");// 创建新的SavedLoginName节点
                        childNode.InnerText = loginName;// 节点内容值为loginName参数
                        namesNode.PrependChild(childNode);// 插入到最前

                        int maxCount = Utils.StrToInt(CacheProvider.GetSysConfig("SavedLoginNameCount"), 5);
                        namesNode = XmlHelper.HandleNodeUnderMaxCount(namesNode, maxCount);// 处理保存账号的最大数量大于config表中配置的数量
                        doc.Save(filePath);// 保存
                    }
                    else if (nameList != null && nameList.Contains(loginName))// 如果账号已保存, 将其提到最前。
                    {
                        if (nameList.Count == 1) return;
                        XmlNode namesNode = rootNode.SelectSingleNode("SavedLoginNames");
                        XmlNodeList childNodes = namesNode.ChildNodes;
                        foreach (XmlNode item in childNodes)
                        {
                            if (loginName.Equals(item.InnerText))
                            {
                                XmlNode newNode = item;
                                namesNode.RemoveChild(item);
                                namesNode.PrependChild(newNode);
                                break;
                            }
                        }
                        doc.Save(filePath);// 保存
                    }
                    //else if(nameList == null) return "failed,读取配置失败！";
                }
                //return (int)Message.SUCCESS;
            }
            catch (Exception ex)
            {
                //return ex.ToString();
            }
        }

4、项目根目录/Config下添加SysConfig.xml保存用户名

<?xml version="1.0" encoding="UTF-8"?>
<SysConfig>
  <SavedLoginNames><!-- 保存的登录账号 -->
    <LoginName>admin</LoginName>
    <LoginName>111</LoginName>
    <LoginName>555</LoginName>
    <LoginName>22</LoginName>
    <LoginName>444</LoginName>
  </SavedLoginNames>
</SysConfig>

效果如图：