WinForm中 Combobox之數據綁定三種方式

下面介紹三種對comboBox綁定的方式，分別是泛型中IList和Dictionary，還有數據集DataTable

 

一、IList
      現在我們直接創建一個List集合，然后綁定
 IList<string> list = new List<string>();
            list.Add("111111");
            list.Add("222222");
            list.Add("333333");
            list.Add("444444");
            comboBox1.DataSource = list;

       IList<string> list = new List<string>();
            list.Add("111111");
            list.Add("222222");
            list.Add("333333");
            list.Add("444444");
            comboBox1.DataSource = list;

執行后，我們會發現綁定成功，但是 我們知道一般對於下拉框的綁定都會有一個值，一個顯示的內容，這個時候我們可以創建一個類，把value和text都封裝到這個類，作為list的類型

public class Info
    {
        public string Id { get; set; }
        public string Name { get; set; }

    }
      private void bindCbox()
        {
            IList<Info> infoList = new List<Info>();
            Info info1 = new Info() { Id="1",Name="張三"};
            Info info2 = new Info() { Id="2",Name="李四"};
            Info info3 = new Info() { Id = "3",Name = "王五" };
            infoList.Add(info1);
            infoList.Add(info2);
            infoList.Add(info3);
            comboBox1.DataSource = infoList;
            comboBox1.ValueMember = "Id";
            comboBox1.DisplayMember = "Name";
        }

這個時候我們就可以直接獲得值和顯示的內容了

 

二、Dictionary

     這個有點特殊，不能直接綁定，需要借助類BindingSource才可以完成綁定

Dictionary<int, string> kvDictonary = new Dictionary<int, string>();
            kvDictonary.Add(1, "11111");
            kvDictonary.Add(2, "22222");
            kvDictonary.Add(3, "333333");

            BindingSource bs = new BindingSource();
            bs.DataSource = kvDictonary;
            comboBox1.DataSource = bs;
            comboBox1.ValueMember = "Key";
            comboBox1.DisplayMember = "Value";


   Dictionary<int, string> kvDictonary = new Dictionary<int, string>();
            kvDictonary.Add(1, "11111");
            kvDictonary.Add(2, "22222");
            kvDictonary.Add(3, "333333");

            BindingSource bs = new BindingSource();
            bs.DataSource = kvDictonary;
            comboBox1.DataSource = bs;
            comboBox1.ValueMember = "Key";
            comboBox1.DisplayMember = "Value";

三、數據集

     這個比較常見，很簡單

//數據集綁定
        private void BindCombox()
        {
            DataTable dt = new DataTable();
            DataColumn dc1 = new DataColumn("id");
            DataColumn dc2 = new DataColumn("name");
            dt.Columns.Add(dc1);
            dt.Columns.Add(dc2);

            DataRow dr1 = dt.NewRow();
            dr1["id"] = "1";
            dr1["name"] = "aaaaaa";

            DataRow dr2 = dt.NewRow();
            dr2["id"] = "2";
            dr2["name"] = "bbbbbb";

            dt.Rows.Add(dr1);
            dt.Rows.Add(dr2);

            comboBox1.DataSource = dt;
            comboBox1.ValueMember = "id";
            comboBox1.DisplayMember = "name";
        }


      //數據集綁定
        private void BindCombox()
        {
            DataTable dt = new DataTable();
            DataColumn dc1 = new DataColumn("id");
            DataColumn dc2 = new DataColumn("name");
            dt.Columns.Add(dc1);
            dt.Columns.Add(dc2);

            DataRow dr1 = dt.NewRow();
            dr1["id"] = "1";
            dr1["name"] = "aaaaaa";

            DataRow dr2 = dt.NewRow();
            dr2["id"] = "2";
            dr2["name"] = "bbbbbb";

            dt.Rows.Add(dr1);
            dt.Rows.Add(dr2);

            comboBox1.DataSource = dt;
            comboBox1.ValueMember = "id";
            comboBox1.DisplayMember = "name";
        }

注意：

當我們觸發combox的SelectedIndexChanged的事件后，我們在加載窗體的時候就會執行，這點我剛開始也和魅惑，導致容易出錯，這點我們可以采取一些方法避免執行，比如可以定義一個變量fig=false

private  void  comboBox1_SelectedIndexChanged( object  sender, EventArgs e)

    {

        if ( this .fig)

        {

            string  selectValue = this .cmbAddMember.SelectedValue.ToString();

 

            rtbaddMember.SelectedText = selectValue;

        }

    }

 

　那么肯定想在加載窗體后，執行了，所以在加載窗體后我們還要把fig的值設為true

 private void SetAutoMessage_Load(object sender, EventArgs e)
        {
            loadCombox();
            loadMessageTemplet();
            fig= true;
        }