ComboBox的奇怪属性

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ComboBox的DropDownStyle为DropDown时,在窗口加载时对其Text属性赋值没用

必须将SelectedIndex设为-1才可以,而在窗口显示后再对Text属性赋值则不需设置SelectedIndex了

奇怪的属性

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            DataTable dt = new DataTable();
            dt.Columns.Add("id");
            dt.Columns.Add("name");

            DataRow dr = dt.NewRow();
            dr["id"] = "";
            dr["name"] = "";
            dt.Rows.Add(dr);

            dr = dt.NewRow();
            dr["id"] = "1";
            dr["name"] = "张三";
            dt.Rows.Add(dr);

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

            comboBox1.SelectedIndex = -1;
            comboBox1.Text = "不在列表中的姓名";
        }
    }