基于SqlSugar的开发框架循序渐进介绍（28）-- 快速构建系统参数管理界面 - 伍华聪

    /// <summary>
    /// 系统参数配置 应用层服务接口实现
    /// </summary>
    public class SystemParamsService : MyCrudService<SystemParamsInfo,string, SystemParamsPagedDto>, ISystemParamsService
  {
       //相关代码
  }

        /// <summary>
        /// 编写初始化窗体的实现，可以用于刷新
        /// </summary>
        public override void FormOnLoad()
        {
            InitSearchControl();
            InitTree();
            BindTree();

            InitDictItem();
            BindData();
        }

      /// <summary>
        /// 初始化树控件
        /// </summary>
        private void InitTree()
        {
            this.tree.Columns.Clear();

            //控件扩展函数封装处理
            this.tree.CreateColumn("CategoryName", "系统参数目录", 160, true);
            this.tree.InitTree(Id_FieldName, "PID", null, false, false);
            this.tree.OptionsDragAndDrop.DragNodesMode = DragNodesMode.Single;

            //设置树的图标集合及逐级图标
            this.tree.SelectImageList = this.imageList1;
            this.tree.CustomDrawNodeImages += (object sender, CustomDrawNodeImagesEventArgs e) =>
            {
                int maxCount = this.imageList1.Images.Count;
                var index = e.Node.Level < maxCount ? e.Node.Level : 0;
                e.SelectImageIndex = index;
            };

            //初始化树节点选择事件
            this.tree.FocusedNodeChanged += delegate (object sender, FocusedNodeChangedEventArgs e)
            {
                this.FocusedNodeChanged();
            };
            this.tree.MouseDoubleClick += (s, e) => { menu_EditType_Click(null, null); };
        }

        /// <summary>
        /// 实现树节点的过滤查询
        /// </summary>
        private void InitSearchControl()
        {
            this.searchControl1.Client = this.tree;
            this.tree.FilterNode += (object sender, FilterNodeEventArgs e) =>
            {
                if (tree.DataSource == null)
                    return;

                string nodeText = e.Node.GetDisplayText("CategoryName");//参数填写FieldName  
                if (string.IsNullOrWhiteSpace(nodeText))
                    return;

                bool isExist = nodeText.IndexOf(searchControl1.Text, StringComparison.OrdinalIgnoreCase) >= 0;
                if (isExist)
                {
                    var node = e.Node.ParentNode;
                    while (node != null)
                    {
                        if (!node.Visible)
                        {
                            node.Visible = true;
                            node = node.ParentNode;
                        }
                        else
                            break;
                    }
                }
                e.Node.Visible = isExist;
                e.Handled = true;
            };
        }

        /// <summary>
        /// 选中树节点触发的查询处理
        /// </summary>
        private void FocusedNodeChanged()
        {
            if (this.tree.FocusedNode != null)
            {
                BindData();
            }
        }
        /// <summary>
        /// 绑定树的数据源
        /// </summary>
        private async void BindTree()
        {
            var result = await BLLFactory<ISystemParamsDirService>.Instance.GetAllAsync();
            if (result != null)
            {
                this.tree.DataSource = result.Items;
                this.tree.ExpandAll();
            }
        }

BLLFactory<ISystemParamsDirService>.Instance.GetAllAsync();