c# winform combox 模糊查询两种加载方式的实现

从网上找到了一种非datasource数据源的查询如combox1的填充方式，因为现在用的都是datasource的数据源，所以又改进了下如combox2的填充方式，如果不增加改变事件都是可以从左查询的。

public partial class Form3 : Form

    {

        //初始化绑定默认关键词（此数据源可以从数据库取）

        List<string> listOnit = new List<string>();

        //输入key之后，返回的关键词

        List<string> listNew = new List<string>();

        DataTable dt = new DataTable();

        public Form3()

        {

            InitializeComponent();

        }

        private void Form3_Load(object sender, EventArgs e)

        {

            BindComboBox();

            BindComboBox1();

        }

        /// <summary>

        /// 绑定ComboBox

        /// </summary>

        private void BindComboBox()

        {

            listOnit.Add("张三");

            listOnit.Add("张思");

            listOnit.Add("张五");

            listOnit.Add("王五");

            listOnit.Add("刘宇");

             //自动完成数据源

            this.comboBox1.AutoCompleteSource = AutoCompleteSource.CustomSource;

            //提示类型  建议列表+自动补全

            this.comboBox1.AutoCompleteMode = AutoCompleteMode.SuggestAppend;

            //绑定数据源

            this.comboBox1.AutoCompleteCustomSource.AddRange(listOnit.ToArray());

        }

        private void BindComboBox1()

        {

           

            dt.Columns.Add("id", typeof(System.String));

            dt.Columns.Add("name", typeof(System.String));

            DataRow dr = dt.NewRow();

            dr[0] = "0";

            dr[1] = "张三";

            dt.Rows.Add(dr);

            DataRow dr1 = dt.NewRow();

            dr1[0] = "1";

            dr1[1] = "张五";

            dt.Rows.Add(dr1);

            DataRow dr2 = dt.NewRow();

            dr2[0] = "2";

            dr2[1] = "马六";

            dt.Rows.Add(dr2);

            this.comboBox2.DataSource = dt;

            this.comboBox2.DisplayMember = "name";

            this.comboBox2.ValueMember = "id";

            ////自动完成数据源

            this.comboBox2.AutoCompleteSource = AutoCompleteSource.CustomSource;

            ////提示类型  建议列表+自动补全

            this.comboBox2.AutoCompleteMode = AutoCompleteMode.SuggestAppend;

            ////绑定数据源

            string[] wb = new string[dt.Rows.Count];

            for (int i = 0; i < dt.Rows.Count; i++)

            {

                wb[i] = dt.Rows[i]["name"].ToString();

            }

            this.comboBox2.AutoCompleteCustomSource.AddRange(wb);

           

        }

             

         private void comboBox1_TextUpdate(object sender, EventArgs e)

         {

             //清空combobox

             this.comboBox1.Items.Clear();

             //清空listNew

             listNew.Clear();

             //遍历全部备查数据

             foreach (var item in listOnit)

             {

                 if (item.Contains(this.comboBox1.Text))

                 {

                     //符合，插入ListNew

                     listNew.Add(item);

                 }

             }

             //combobox添加已经查到的关键词

             this.comboBox1.Items.AddRange(listNew.ToArray());

             //设置光标位置，否则光标位置始终保持在第一列，造成输入关键词的倒序排列

             this.comboBox1.SelectionStart = this.comboBox1.Text.Length;

             //保持鼠标指针原来状态，有时候鼠标指针会被下拉框覆盖，所以要进行一次设置。

             Cursor = Cursors.Default;

             //自动弹出下拉框

             this.comboBox1.DroppedDown = true;

         }

         private void comboBox2_TextUpdate(object sender, EventArgs e)

         {

             string strsearch = this.comboBox2.Text.ToString();

             this.comboBox2.DataSource = null;

             this.comboBox2.Items.Clear();

             DataView dt1 = new DataView();

             dt1 = dt.DefaultView;

             dt1.RowFilter = "name like '%" + strsearch + "%'";

             this.comboBox2.DataSource = dt1;

             this.comboBox2.DisplayMember = "name";

             this.comboBox2.ValueMember = "id";

             Cursor = Cursors.Default;

             this.comboBox2.Text = strsearch;

             this.comboBox2.SelectionStart = strsearch.Length;

             //自动弹出下拉框

             this.comboBox2.DroppedDown = true;

         }

        

    }