C# ComboBox DroppedDown属性存在的问题

功能描述:初始化将数据赋值給ComboBox,通过输入值再查询数据库,功能类似于google搜索功能

直接绑定的话,数据动态变化会报"内存破坏"的信息,所以这里就没有绑定了

存在的问题:1.当输入关键字时,输入的顺序是反序的

                2.鼠标指针被窗体掩盖

                3.输入关键字后,下拉框自动弹出时点内容需点击两次

                4.下拉列表出来后,不能使用键盘上下键进行选择

代码:

            private void comboBox1_TextChanged(object sender, EventArgs e) { try { this.comboBox1.TextChanged -= new System.EventHandler(this.comboBox1_TextChanged); comboBox1.Items.Clear(); string text = this.comboBox1.Text; DataSet dataSet = GetUriResultInfo(text); //if (this.comboBox1.Text != "" && this.comboBox1.Text != " ") //{ // comboBox1.DataSource = null; //} //comboBox1.DataSource = dataSet.Tables[0]; //comboBox1.DisplayMember = "Content"; //comboBox1.ValueMember = "SeqNo"; //comboBox1.SelectedIndex = -1; for (int i = 0; i < dataSet.Tables[0].Rows.Count; i++) { this.comboBox1.Items.Add(dataSet.Tables[0].Rows[i]["Content"]); } comboBox1.DroppedDown = true; comboBox1.Text = text; comboBox1.SelectionStart = comboBox1.Text.Length; //显示鼠标指针 System.Windows.Forms.Cursor.Current = System.Windows.Forms.Cursors.IBeam; //保持鼠标指针形状 Cursor = System.Windows.Forms.Cursors.Default; //Cursor.Show(); //Cursor.Position = new Point(200, 200); //Cursor.Position = new Point(Cursor.Position.X, Cursor.Position.Y); this.comboBox1.TextChanged += new System.EventHandler(this.comboBox1_TextChanged); } catch (Exception ex) { Console.WriteLine(ex.Message); //AppLogger.LogErrException("frmPrint.cs//frmPrint::LoadUriRpt", ex); } finally { } }

 

            解决了问题一和二,第三个和第四问题待解决