引用dll：
http://pan.baidu.com/s/1qXa97UO
自定义类：
namespace TMI_S
{
/// <summary>
/// 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:
/// </summary>
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<TreeNode> SelectedItems
{
get
{
List<TreeNode> lsttn = new List<TreeNode>();
foreach (TreeNode tn in lst.Nodes)
{
if (tn.Checked)
{
lsttn.Add(tn);
}
}
return lsttn;
}
}
/// <summary>
/// 数据源
/// </summary>
[Description("数据源"), Category("Data")]
public object DataSource
{
get;
set;
}
/// <summary>
/// 显示字段
/// </summary>
[Description("显示字段"), Category("Data")]
public string DisplayFiled
{
get;
set;
}
/// <summary>
/// 值字段
/// </summary>
[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);
}
}
/// <summary>
/// 绑定到可枚举类型
/// </summary>
/// <param name="enumerable">可枚举类型</param>
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<ImagePropertyModule> 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();
}
}
/// <summary>
/// 对象帮助类
/// </summary>
public class ObjectUtil
{
/// <summary>
/// 获取对象的属性值
/// </summary>
/// <param name="obj">可能是DataRowView或一个对象</param>
/// <param name="propertyName">属性名</param>
/// <returns>属性值</returns>
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<JValue>(propertyName).Value; //.getValue(propertyName);
}
else
{
result = GetPropertyValueFormObject(obj, propertyName);
}
}
catch (Exception)
{
// 找不到此属性
}
return result;
}
/// <summary>
/// 获取对象的属性值
/// </summary>
/// <param name="obj">对象</param>
/// <param name="propertyName">属性名（"Color"、"BodyStyle"或者"Info.UserName"）</param>
/// <returns>属性值</returns>
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);
