int c_count = 0; //储存文本长度
private void comb_goods_name_KeyUp(object sender, KeyEventArgs e)
{
if (comb_goods_name.Text.Length != c_count && comb_goods_name.Text.Length != 0) //如果事件触发时文本长度和原长度不一致同时不为空时触发
{
listgm.Clear();
string text = comb_goods_name.Text; //把文本框值赋给text
listgm = gb.FindLike(comb_goods_name.Text); //根据用户输入的值查询
DataTable ta = new DataTable(); //绑定数据到 comb_goods_name
ta.Columns.Add("ID");
ta.Columns.Add("名称");
foreach (GoodsMOD item in listgm)
{
DataRow row = ta.NewRow();
row["ID"] = item.Id;
row["名称"] = item.Goods_name;
ta.Rows.Add(row);
}
comb_goods_name.DataSource = ta;
comb_goods_name.DisplayMember = "名称";
comb_goods_name.ValueMember = "ID";
Cursor = Cursors.Default; // 重新获取鼠标
this.comb_goods_name.DroppedDown = true; //弹出下拉列表
comb_goods_name.Text = text; //把text的值赋给文本框
comb_goods_name.SelectionStart = comb_goods_name.Text.Length; //把光标移到最后面
}
c_count = comb_goods_name.Text.Length; //把当前文本长度赋给c_count
}