WinForm中 Combobox之数据绑定三种方式

下面介绍三种对comboBox绑定的方式，分别是泛型中IList和Dictionary，还有数据集DataTable

 

一、IList
      现在我们直接创建一个List集合，然后绑定
 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;

执行后，我们会发现绑定成功，但是 我们知道一般对于下拉框的绑定都会有一个值，一个显示的内容，这个时候我们可以创建一个类，把value和text都封装到这个类，作为list的类型

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="张三"};
            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";
        }

这个时候我们就可以直接获得值和显示的内容了

 

二、Dictionary

     这个有点特殊，不能直接绑定，需要借助类BindingSource才可以完成绑定

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、数据集

     这个比较常见，很简单

//数据集绑定
        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";
        }


      //数据集绑定
        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：

当我们触发combox的SelectedIndexChanged的事件后，我们在加载窗体的时候就会执行，这点我刚开始也和魅惑，导致容易出错，这点我们可以采取一些方法避免执行，比如可以定义一个变量fig=false

private  void  comboBox1_SelectedIndexChanged( object  sender, EventArgs e)

    {

        if ( this .fig)

        {

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

 

            rtbaddMember.SelectedText = selectValue;

        }

    }

 

　那么肯定想在加载窗体后，执行了，所以在加载窗体后我们还要把fig的值设为true

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