c#自定义LookUpCotent，下拉搜索框

先看效果：自定义下拉控件，可以放任意自己的空间。

设计思路：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace UCLibs
{
    public partial class UCLookUpEdit : UserControl
    {
        public UCLookUpEdit()
        {
            InitializeComponent();
        }

        public bool LabelClickAble { get; set; } = true;

        public UCLookUpPanel ContentPanel { get; set; }

        public string FilterDes { get; set; }

        public Dictionary<string, string> FilterDic { get; set; } = new Dictionary<string, string>();

        //查询完成，点击【确定】按钮事件
        public Action SearchEnter { get; set; }

        private void UCLookUpEdit_Load(object sender, EventArgs e)
        {

        }

        /// <summary>
        /// 绑定查询的PANEL
        /// </summary>
        /// <param name="pn"></param>
        public void BindContentPanel(UCLookUpPanel pn)
        {
            this.ContentPanel = pn;

            this.ContentPanel.Enter = () =>
            {
                this.FilterDes = this.ContentPanel.iContent.GetFilterDes();
                this.lbDis.Text = this.FilterDes;
                this.FilterDic=this.ContentPanel.iContent.GetFilterDic();

                this.ContentPanel.Hide();

                if(this.SearchEnter != null)
                {
                    this.SearchEnter();
                }
            };

            this.ContentPanel.Clear = () =>
            {
                this.FilterDes = "";
                this.lbDis.Text = "--请选择条件--";
                this.FilterDic = new Dictionary<string, string>();
            };

            this.ContentPanel.FindForm().Click += (s, e) =>
            {
                //点击了，其他位置，隐藏查询
                this.ContentPanel.Hide();
            };

            this.ContentPanel.Parent.Click += (s, e) =>
            {
                //查询PANEL失去焦点，隐藏查询
                this.ContentPanel.Hide();
            };

            
        }
        
        /// <summary>
        /// 显示查询界面
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void lbLookUp_Click(object sender, EventArgs e)
        {
            var ctl = this.ContentPanel as Control;
            if(this.Top+this.Height + ctl.Height >this.FindForm().Height)
            {
                ctl.Top = this.Top - 25 - ctl.Height;
            }
            else
            {
                ctl.Top = this.Top + 25;
            }
            
            ctl.Visible = !ctl.Visible;
          
        }

        private void lbDis_Click(object sender, EventArgs e)
        {
            if(this.LabelClickAble)
            {
                lbLookUp_Click(null, null);
            }
        }
    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace UCLibs
{
    public partial class UCLookUpPanel : UserControl
    {
        public UCLookUpPanel()
        {
            InitializeComponent();
        }

        public ILookUpCotent iContent;

        public Action Enter { get; set; }
        public Action Clear { get; set; }


        private void UCLookUpPanel_Load(object sender, EventArgs e)
        {

        }

        public void AddContent(ILookUpCotent content)
        {
            this.iContent = content;
            var ctl = content as Control;
            ctl.Dock = DockStyle.Fill;
            this.pnMain.Controls.Add(ctl);


        }

        private void btnEnter_Click(object sender, EventArgs e)
        {
            this.Enter();
        }

        private void btnClear_Click(object sender, EventArgs e)
        {
            this.iContent.Clear();
            this.Clear();

        }

        private void lbClose_Click(object sender, EventArgs e)
        {
            this.Hide();
        }

        private void lbClose_MouseEnter(object sender, EventArgs e)
        {
            
        }

        private void lbClose_MouseLeave(object sender, EventArgs e)
        {
            
        }

        private void btnClose_Click(object sender, EventArgs e)
        {
            this.Hide();
        }

        private void lbClear_Click(object sender, EventArgs e)
        {
            this.iContent.Clear();
            this.Clear();
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace UCLibs
{
    public interface ILookUpCotent
    {
        /// <summary>
        /// 查询编辑控件
        /// </summary>
        UCLookUpEdit ContainerLookUp { get; set; }

        /// <summary>
        /// 描述
        /// </summary>
        string Des { get;  }

        /// <summary>
        /// 获取查询条件的文字描述
        /// </summary>
        string GetFilterDes();


        /// <summary>
        /// 查询条件集合
        /// </summary>
        /// <returns></returns>
        Dictionary<string, string> GetFilterDic();

        /// <summary>
        /// 清空条件
        /// </summary>
        void Clear();

        /// <summary>
        /// 初始化数据
        /// </summary>
        void InitData(object data);


    }
}

调用方法：界面上拉EDIT，PANEL，和接口控件

//初始化查询控件容器
            this.ucLookUpEdit1.BindContentPanel( this.ucLookUpPanel1);
            LKProductSearch sr = new LKProductSearch();
            //自己写的 ILookUpCotent 控件加进来
            this.ucLookUpPanel1.AddContent(sr);

            var tb = this.SearchDB();
            //初始化查询UC里面的数据，实际按项目里的自己来查
            sr.InitData(tb);

            //查询点击确定按钮 
            this.ucLookUpEdit1.SearchEnter = () =>
            {
                this.Search1();
            };

 private void Search1()
        {
            if (this.ucLookUpEdit1.FilterDic.Count == 0)
            {
                MessageBox.Show("ucLookUpEdit1 未选择任何查询条件！请重新选择！");
                return;
            }

            //自己用FilterDic写查询条件 
            //列如 
            string codes = this.ucLookUpEdit1.FilterDic["CODES"];
            string sql = "select * from xx where p_code in (" + codes + ")";

            //查询参数字典 this.ucLookUpEdit1.FilterDic
            //查询描述     this.ucLookUpEdit1.FilterDes
            MessageBox.Show("ucLookUpEdit1 查询条件是：" + this.ucLookUpEdit1.FilterDes + "\r\n" +
                "查询SQL：" + sql);
        }