引用dll：
http://pan.baidu.com/s/1qXa97UO
自定义类：
namespace TMI_S { ////// 功能描述:自定义多选下拉框 /// 作 者:huangzh /// 创建日期:2016-01-04 11:57:13 /// 任务编号: /// public class MultiComboBox : ComboBox { public TreeView lst = new TreeView(); Form_Main form_Call; public MultiComboBox(Form_Main form_Call) { this.form_Call = form_Call; this.DrawMode = DrawMode.OwnerDrawFixed;//只有设置这个属性为OwnerDrawFixed才可能让重画起作用 lst.KeyUp += new KeyEventHandler(lst_KeyUp); lst.MouseUp += new MouseEventHandler(lst_MouseUp); // lst.KeyDown += new KeyEventHandler(lst_KeyDown); lst.Leave += new EventHandler(lst_Leave); lst.CheckBoxes = true; lst.ShowLines = false; lst.ShowPlusMinus = false; lst.ShowRootLines = false; this.DropDownHeight = 29; } void lst_Leave(object sender, EventArgs e) { lst.Hide(); } #region Property [Description("选定项的值"), Category("Data")] public List SelectedItems { get { List lsttn = new List (); foreach (TreeNode tn in lst.Nodes) { if (tn.Checked) { lsttn.Add(tn); } } return lsttn; } } /// /// 数据源 /// [Description("数据源"), Category("Data")] public object DataSource { get; set; } /// /// 显示字段 /// [Description("显示字段"), Category("Data")] public string DisplayFiled { get; set; } /// /// 值字段 /// [Description("值字段"), Category("Data")] public string ValueFiled { get; set; } #endregion public void DataBind() { this.BeginUpdate(); if (DataSource != null) { if (DataSource is IDataReader) { DataTable dataTable = new DataTable(); dataTable.Load(DataSource as IDataReader); DataBindToDataTable(dataTable); } else if (DataSource is DataView || DataSource is DataSet || DataSource is DataTable) { DataTable dataTable = null; if (DataSource is DataView) { dataTable = ((DataView)DataSource).ToTable(); } else if (DataSource is DataSet) { dataTable = ((DataSet)DataSource).Tables[0]; } else { dataTable = ((DataTable)DataSource); } DataBindToDataTable(dataTable); } else if (DataSource is IEnumerable) { DataBindToEnumerable((IEnumerable)DataSource); } else { throw new Exception("DataSource doesn't support data type: " + DataSource.GetType().ToString()); } } else { lst.Nodes.Clear(); } lst.ItemHeight = this.ItemHeight; lst.BorderStyle = BorderStyle.FixedSingle; lst.Size = new Size(this.DropDownWidth, this.ItemHeight * (this.MaxDropDownItems - 1) - (int)this.ItemHeight / 2); lst.Location = new Point(this.Left, this.Top + this.ItemHeight + 6); this.Controls.Add(lst); lst.Hide(); this.EndUpdate(); } private void DataBindToDataTable(DataTable dt) { foreach (DataRow dr in dt.Rows) { TreeNode tn = new TreeNode(); if (!string.IsNullOrEmpty(DisplayFiled) && !string.IsNullOrEmpty(ValueFiled)) { tn.Text = dr[DisplayFiled].ToString(); tn.Tag = dr[ValueFiled].ToString(); } else if (string.IsNullOrEmpty(ValueFiled)) { tn.Text = dr[DisplayFiled].ToString(); tn.Tag = dr[DisplayFiled].ToString(); } else if (string.IsNullOrEmpty(DisplayFiled)) { tn.Text = dr[ValueFiled].ToString(); tn.Tag = dr[ValueFiled].ToString(); } else { throw new Exception("ValueFiled和DisplayFiled至少保证有一项有值"); } tn.Checked = false; lst.Nodes.Add(tn); } } /// /// 绑定到可枚举类型 /// /// 可枚举类型 private void DataBindToEnumerable(IEnumerable enumerable) { IEnumerator enumerator = enumerable.GetEnumerator(); while (enumerator.MoveNext()) { object currentObject = enumerator.Current; lst.Nodes.Add(CreateListItem(currentObject)); } } private TreeNode CreateListItem(Object obj) { TreeNode item = new TreeNode(); if (obj is string) { item.Text = obj.ToString(); item.Tag = obj.ToString(); } else { if (DisplayFiled != "") { item.Text = GetPropertyValue(obj, DisplayFiled); } else { item.Text = obj.ToString(); } if (ValueFiled != "") { item.Tag = GetPropertyValue(obj, ValueFiled); } else { item.Tag = obj.ToString(); } } return item; } private string GetPropertyValue(object obj, string propertyName) { object result = null; result = ObjectUtil.GetPropertyValue(obj, propertyName); return result == null ? String.Empty : result.ToString(); } #region override protected override void OnKeyUp(KeyEventArgs e) { base.OnKeyDown(e); bool Pressed = (e.Control && ((e.KeyData & Keys.A) == Keys.A)); if (Pressed) { this.Text = ""; for (int i = 0; i < lst.Nodes.Count; i++) { lst.Nodes[i].Checked = true; if (this.Text != "") { this.Text += ","; } this.Text += lst.Nodes[i].Tag; } } } protected override void OnMouseDown(MouseEventArgs e) { this.DroppedDown = false; } protected override void OnMouseUp(MouseEventArgs e) { this.DroppedDown = false; lst.Focus(); } protected override void OnDropDown(EventArgs e) { if (lst != null) { lst.Nodes.Clear(); } DataSet itemSet = new DataSet(); DataTable dt = new DataTable(); List IPMS = ImagePropertyServices.GetImagePropertyInfo("localhost"); dt.Columns.Add("PropertyValue", Type.GetType("System.String")); foreach (ImagePropertyModule ipm in IPMS) { DataRow dr = dt.NewRow(); dr["PropertyValue"] = ipm.PropertyValue; dt.Rows.Add(dr); } itemSet.Tables.Add(dt); this.DataSource = itemSet; DataBind(); lst.Location=new Point(1497, 150); form_Call.Controls.Add(lst); lst.BringToFront(); string strValue = this.Text; if (!string.IsNullOrEmpty(strValue)) { List<string> lstvalues = strValue.Split(',').ToList<string>(); foreach (TreeNode tn in lst.Nodes) { if (tn.Checked && !lstvalues.Contains(tn.Tag.ToString()) && !string.IsNullOrEmpty(tn.Tag.ToString().Trim())) { tn.Checked = false; } else if (!tn.Checked && lstvalues.Contains(tn.Tag.ToString()) && !string.IsNullOrEmpty(tn.Tag.ToString().Trim())) { tn.Checked = true; } } } lst.Show(); } #endregion private void lst_KeyUp(object sender, KeyEventArgs e) { this.OnKeyUp(e); } private void lst_MouseUp(object sender, MouseEventArgs e) { try { this.Text = ""; for (int i = 0; i < lst.Nodes.Count; i++) { if (lst.Nodes[i].Checked) { if (this.Text != "") { this.Text += ","; } this.Text += lst.Nodes[i].Tag; } } } catch { this.Text = ""; } bool isControlPressed = (Control.ModifierKeys == Keys.Control); bool isShiftPressed = (Control.ModifierKeys == Keys.Shift); if (isControlPressed || isShiftPressed) lst.Show(); else lst.Hide(); } } /// /// 对象帮助类 /// public class ObjectUtil { /// /// 获取对象的属性值 /// /// 可能是DataRowView或一个对象 /// 属性名 /// 属性值 public static object GetPropertyValue(object obj, string propertyName) { object result = null; try { if (obj is DataRow) { result = (obj as DataRow)[propertyName]; } else if (obj is DataRowView) { result = (obj as DataRowView)[propertyName]; } else if (obj is JObject) { result = (obj as JObject).Value (propertyName).Value; //.getValue(propertyName); } else { result = GetPropertyValueFormObject(obj, propertyName); } } catch (Exception) { // 找不到此属性 } return result; } /// /// 获取对象的属性值 /// /// 对象 /// 属性名（"Color"、"BodyStyle"或者"Info.UserName"） /// 属性值 private static object GetPropertyValueFormObject(object obj, string propertyName) { object rowObj = obj; object result = null; if (propertyName.IndexOf(".") > 0) { string[] properties = propertyName.Split('.'); object tmpObj = rowObj; for (int i = 0; i < properties.Length; i++) { PropertyInfo property = tmpObj.GetType().GetProperty(properties[i], BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic); if (property != null) { tmpObj = property.GetValue(tmpObj, null); } } result = tmpObj; } else { PropertyInfo property = rowObj.GetType().GetProperty(propertyName, BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic); if (property != null) { result = property.GetValue(rowObj, null); } } return result; } } }
引用code：
MultiComboBox comboBoxEx = new MultiComboBox(this); comboBoxEx.DisplayFiled = "PropertyValue"; comboBoxEx.DataBind(); comboBoxEx.Location = new Point(10,48); comboBoxEx.Width = 96; comboBoxEx.Height = 20; this.groupBox11.Controls.Add(comboBoxEx);