C# 保留在鼠标单击时触发的事件，但不在方向键上触发
所以我有我的应用程序的截图。要解释发生了什么，我使用leave事件在没有从列表中选择有效项时显示MessageBox。目前，如果我开始键入，然后尝试用鼠标选择项目，它会出现，但如果我使用箭头键，它不会出现。例如，在这个屏幕截图中，我输入“cen”，我想从列表中选择“Camp Chicken Bourt 10.5oz（17960）”，如果我使用方向键，然后按enter键，这是可以的，但如果我使用鼠标，则事件下方的消息框会被弹出。我还注意到，它允许在MessageBox关闭后通过鼠标左键进行选择。在用户关闭MessageBox之后选择一个项目非常麻烦。这有什么办法吗？下图是“离开”事件函数 更新为suggestComboBoxC# 保留在鼠标单击时触发的事件，但不在方向键上触发,c#,winforms,C#,Winforms,所以我有我的应用程序的截图。要解释发生了什么，我使用leave事件在没有从列表中选择有效项时显示MessageBox。目前，如果我开始键入，然后尝试用鼠标选择项目，它会出现，但如果我使用箭头键，它不会出现。例如，在这个屏幕截图中，我输入“cen”，我想从列表中选择“Camp Chicken Bourt 10.5oz（17960）”，如果我使用方向键，然后按enter键，这是可以的，但如果我使用鼠标，则事件下方的消息框会被弹出。我还注意到，它允许在MessageBox关闭后通过鼠标左键进行选择。在
using System.Windows.Forms;
namespace AutoCompleteComboBox
{
public class SuggestComboBox : ComboBox
{
#region fields and properties
private readonly ListBox _suggLb = new ListBox { Visible = false, TabStop = false };
private readonly BindingList<string> _suggBindingList = new BindingList<string>();
private Expression<Func<ObjectCollection, IEnumerable<string>>> _propertySelector;
private Func<ObjectCollection, IEnumerable<string>> _propertySelectorCompiled;
private Expression<Func<string, string, bool>> _filterRule;
private Func<string, bool> _filterRuleCompiled;
private Expression<Func<string, string>> _suggestListOrderRule;
private Func<string, string> _suggestListOrderRuleCompiled;
public int SuggestBoxHeight
{
get { return _suggLb.Height; }
set { if (value > 0) _suggLb.Height = value; }
}
/// <summary>
/// If the item-type of the ComboBox is not string,
/// you can set here which property should be used
/// </summary>
public Expression<Func<ObjectCollection, IEnumerable<string>>> PropertySelector
{
get { return _propertySelector; }
set
{
if (value == null) return;
_propertySelector = value;
_propertySelectorCompiled = value.Compile();
}
}
///<summary>
/// Lambda-Expression to determine the suggested items
/// (as Expression here because simple lamda (func) is not serializable)
/// <para>default: case-insensitive contains search</para>
/// <para>1st string: list item</para>
/// <para>2nd string: typed text</para>
///</summary>
public Expression<Func<string, string, bool>> FilterRule
{
get { return _filterRule; }
set
{
if (value == null) return;
_filterRule = value;
_filterRuleCompiled = item => value.Compile()(item, Text);
}
}
///<summary>
/// Lambda-Expression to order the suggested items
/// (as Expression here because simple lamda (func) is not serializable)
/// <para>default: alphabetic ordering</para>
///</summary>
public Expression<Func<string, string>> SuggestListOrderRule
{
get { return _suggestListOrderRule; }
set
{
if (value == null) return;
_suggestListOrderRule = value;
_suggestListOrderRuleCompiled = value.Compile();
}
}
#endregion
/// <summary>
/// ctor
/// </summary>
public SuggestComboBox()
{
// set the standard rules:
_filterRuleCompiled = s => s.ToLower().Contains(Text.Trim().ToLower());
_suggestListOrderRuleCompiled = s => s;
_propertySelectorCompiled = collection => collection.Cast<string>();
_suggLb.DataSource = _suggBindingList;
_suggLb.Click += SuggLbOnClick;
ParentChanged += OnParentChanged;
}
/// <summary>
/// the magic happens here ;-)
/// </summary>
/// <param name="e"></param>
protected override void OnTextChanged(EventArgs e)
{
base.OnTextChanged(e);
if (!Focused) return;
_suggBindingList.Clear();
_suggBindingList.RaiseListChangedEvents = false;
_propertySelectorCompiled(Items)
.Where(_filterRuleCompiled)
.OrderBy(_suggestListOrderRuleCompiled)
.ToList()
.ForEach(_suggBindingList.Add);
_suggBindingList.RaiseListChangedEvents = true;
_suggBindingList.ResetBindings();
_suggLb.Visible = _suggBindingList.Any();
if (_suggBindingList.Count == 1 &&
_suggBindingList.Single().Length == Text.Trim().Length)
{
Text = _suggBindingList.Single();
Select(0, Text.Length);
_suggLb.Visible = false;
}
}
#region size and position of suggest box
/// <summary>
/// suggest-ListBox is added to parent control
/// (in ctor parent isn't already assigned)
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void OnParentChanged(object sender, EventArgs e)
{
Parent.Controls.Add(_suggLb);
Parent.Controls.SetChildIndex(_suggLb, 0);
_suggLb.Top = Top + Height - 3;
_suggLb.Left = Left + 3;
_suggLb.Width = Width - 20;
_suggLb.Font = new Font("Segoe UI", 9);
}
protected override void OnLocationChanged(EventArgs e)
{
base.OnLocationChanged(e);
_suggLb.Top = Top + Height - 3;
_suggLb.Left = Left + 3;
}
protected override void OnSizeChanged(EventArgs e)
{
base.OnSizeChanged(e);
_suggLb.Width = Width - 20;
}
#endregion
#region visibility of suggest box
protected override void OnLostFocus(EventArgs e)
{
// _suggLb can only getting focused by clicking (because TabStop is off)
// --> click-eventhandler 'SuggLbOnClick' is called
if (!_suggLb.Focused)
HideSuggBox();
base.OnLostFocus(e);
}
private void SuggLbOnClick(object sender, EventArgs eventArgs)
{
Text = _suggLb.Text;
Focus();
}
private void HideSuggBox()
{
_suggLb.Visible = false;
}
protected override void OnDropDown(EventArgs e)
{
HideSuggBox();
base.OnDropDown(e);
}
#endregion
#region keystroke events
/// <summary>
/// if the suggest-ListBox is visible some keystrokes
/// should behave in a custom way
/// </summary>
/// <param name="e"></param>
protected override void OnPreviewKeyDown(PreviewKeyDownEventArgs e)
{
if (!_suggLb.Visible)
{
base.OnPreviewKeyDown(e);
return;
}
switch (e.KeyCode)
{
case Keys.Down:
if (_suggLb.SelectedIndex < _suggBindingList.Count - 1)
_suggLb.SelectedIndex++;
return;
case Keys.Up:
if (_suggLb.SelectedIndex > 0)
_suggLb.SelectedIndex--;
return;
case Keys.Enter:
Text = _suggLb.Text;
Select(0, Text.Length);
_suggLb.Visible = false;
return;
case Keys.Escape:
HideSuggBox();
return;
}
base.OnPreviewKeyDown(e);
}
private static readonly Keys[] KeysToHandle = new[] { Keys.Down, Keys.Up, Keys.Enter, Keys.Escape };
protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
// the keysstrokes of our interest should not be processed be base class:
if (_suggLb.Visible && KeysToHandle.Contains(keyData))
return true;
return base.ProcessCmdKey(ref msg, keyData);
}
#endregion
}
使用System.Windows.Forms；
名称空间自动完成组合框
{
公共类SuggestComboBox:ComboBox
{
#区域字段和属性
私有只读列表框_suggLb=new ListBox{Visible=false，TabStop=false}；
私有只读绑定列表_suggBindingList=new BindingList（）；
私有表达式属性选择器；
私有功能属性选择或组合；
私有表达式过滤规则；
已编译的专用函数filterrule；
私有表达式_suggestListOrderRule；
已编译的专用Func_SuggestListOrderRule；
公共int SuggestBoxHeight
{
获取{return\u suggLb.Height；}
设置{if（value>0）_suggLb.Height=value；}
}
///
///如果组合框的项目类型不是字符串，
///您可以在此处设置应使用的属性
///
公共表达式属性选择器
{
获取{return}propertySelector；}
设置
{
if（value==null）返回；
_属性选择器=值；
_propertySelectorCompiled=value.Compile（）；
}
}
///
///Lambda表达式来确定建议的项目
///（此处为表达式，因为简单lamda（func）不可序列化）
///默认值：不区分大小写包含搜索
///第一个字符串：列表项
///第二个字符串：键入的文本
///
公共表达式筛选器规则
{
获取{return\u filterRule；}
设置
{
if（value==null）返回；
_filterRule=值；
_filterRuleCompiled=item=>value.Compile（）（项，文本）；
}
}
///
///Lambda表达式对建议的项目进行排序
///（此处为表达式，因为简单lamda（func）不可序列化）
///默认值：字母顺序
///
公共表达式SuggestListOrderRule
{
获取{return\u suggestListOrderRule；}
设置
{
if（value==null）返回；
_suggestListOrderRule=值；
_suggestListOrderRuleCompiled=value.Compile（）；
}
}
#端区
///
///执行器
///
公共建议组合框（）
{
//制定标准规则：
_filterRuleCompiled=s=>s.ToLower（）.Contains（Text.Trim（）.ToLower（））；
_suggestListOrderRuleCompiled=s=>s；
_propertySelectorCompiled=collection=>collection.Cast（）；
_suggLb.DataSource=\u suggBindingList；
_suggLb.Click+=SuggLbOnClick；
ParentChanged+=OnParentChanged；
}
///
///魔法就发生在这里；-）
///
///
受保护的覆盖void OnTextChanged（事件参数e）
{
base.OnTextChanged（e）；
如果（！聚焦）返回；
_suggBindingList.Clear（）；
_suggBindingList.RaiseListChangedEvents=false；
_属性选择或组合（项目）
.Where（_filterRuleCompiled）
.OrderBy（_suggestListOrderRuleCompiled）
托利斯先生（）
.ForEach（_suggBindingList.Add）；
_suggBindingList.RaiseListChangedEvents=true；
_suggBindingList.ResetBindings（）；
_suggLb.Visible=\u suggBindingList.Any（）；
如果（_suggBindingList.Count==1&&
_suggBindingList.Single（）.Length==Text.Trim（）.Length）
{
Text=_suggBindingList.Single（）；
选择（0，文本长度）；
_suggLb.Visible=false；
}
}
#建议框的区域大小和位置
///
///建议将列表框添加到父控件
///（在ctor中，尚未指定父项）
///
///
///
private void OnParentChanged（对象发送方，事件参数e）
{
Parent.Controls.Add（_suggLb）；
Parent.Controls.SetChildIndex（_-suggLb，0）；
_suggLb.Top=顶部+高度-3；
_suggLb.Left=左+3；
_宽度=宽度-20；
_字体=新字体（“Segoe UI”，9）；
}
受保护的覆盖无效OnLocationChanged（事件参数e）
{
基础。位置改变（e）；
_suggLb.Top=顶部+高度-3；
_suggLb.Left=左+3；
}
IzeChanged上的受保护覆盖无效（EventArgs e）
{
基地.OnSizeChanged（e）；
_宽度=宽度-20；
}
#端区
#建议框的区域可见性
受保护的覆盖void OnLostFocus（事件参数e）
{
//_suggLb只能通过单击获得焦点（因为TabStop已关闭）
//-->click eventhandler调用“SuggLbOnClick”
如果（！\u suggLb.Focused）
hidesugbox（）；
base.OnLostFocus（e）；
}
私有void SuggLbOnClick（对象发送方，EventArgs EventArgs）
{
Text=_suggLb.Text；
焦点（）；
}
私有void HideSuggBox（）
{
_suggLb.Visible=false；
}
受保护的覆盖无效OnDropDown（事件参数e）
{
hidesugbox（）；
基础.降速（e）；
}
#端区
#区域击键事件
///
///如果建议列表框可见，则会出现一些按键
///应该按习惯行事
///
///
受保护的
using System.Windows.Forms;
namespace AutoCompleteComboBox
{
public class SuggestComboBox : ComboBox
{
#region fields and properties
private readonly ListBox _suggLb = new ListBox { Visible = false, TabStop = false };
private readonly BindingList<string> _suggBindingList = new BindingList<string>();
private Expression<Func<ObjectCollection, IEnumerable<string>>> _propertySelector;
private Func<ObjectCollection, IEnumerable<string>> _propertySelectorCompiled;
private Expression<Func<string, string, bool>> _filterRule;
private Func<string, bool> _filterRuleCompiled;
private Expression<Func<string, string>> _suggestListOrderRule;
private Func<string, string> _suggestListOrderRuleCompiled;
public int SuggestBoxHeight
{
get { return _suggLb.Height; }
set { if (value > 0) _suggLb.Height = value; }
}
/// <summary>
/// If the item-type of the ComboBox is not string,
/// you can set here which property should be used
/// </summary>
public Expression<Func<ObjectCollection, IEnumerable<string>>> PropertySelector
{
get { return _propertySelector; }
set
{
if (value == null) return;
_propertySelector = value;
_propertySelectorCompiled = value.Compile();
}
}
///<summary>
/// Lambda-Expression to determine the suggested items
/// (as Expression here because simple lamda (func) is not serializable)
/// <para>default: case-insensitive contains search</para>
/// <para>1st string: list item</para>
/// <para>2nd string: typed text</para>
///</summary>
public Expression<Func<string, string, bool>> FilterRule
{
get { return _filterRule; }
set
{
if (value == null) return;
_filterRule = value;
_filterRuleCompiled = item => value.Compile()(item, Text);
}
}
///<summary>
/// Lambda-Expression to order the suggested items
/// (as Expression here because simple lamda (func) is not serializable)
/// <para>default: alphabetic ordering</para>
///</summary>
public Expression<Func<string, string>> SuggestListOrderRule
{
get { return _suggestListOrderRule; }
set
{
if (value == null) return;
_suggestListOrderRule = value;
_suggestListOrderRuleCompiled = value.Compile();
}
}
#endregion
/// <summary>
/// ctor
/// </summary>
public SuggestComboBox()
{
// set the standard rules:
_filterRuleCompiled = s => s.ToLower().Contains(Text.Trim().ToLower());
_suggestListOrderRuleCompiled = s => s;
_propertySelectorCompiled = collection => collection.Cast<string>();
_suggLb.DataSource = _suggBindingList;
_suggLb.Click += SuggLbOnClick;
ParentChanged += OnParentChanged;
}
/// <summary>
/// the magic happens here ;-)
/// </summary>
/// <param name="e"></param>
protected override void OnTextChanged(EventArgs e)
{
base.OnTextChanged(e);
if (!Focused) return;
_suggBindingList.Clear();
_suggBindingList.RaiseListChangedEvents = false;
_propertySelectorCompiled(Items)
.Where(_filterRuleCompiled)
.OrderBy(_suggestListOrderRuleCompiled)
.ToList()
.ForEach(_suggBindingList.Add);
_suggBindingList.RaiseListChangedEvents = true;
_suggBindingList.ResetBindings();
_suggLb.Visible = _suggBindingList.Any();
if (_suggBindingList.Count == 1 &&
_suggBindingList.Single().Length == Text.Trim().Length)
{
Text = _suggBindingList.Single();
Select(0, Text.Length);
_suggLb.Visible = false;
}
}
#region size and position of suggest box
/// <summary>
/// suggest-ListBox is added to parent control
/// (in ctor parent isn't already assigned)
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void OnParentChanged(object sender, EventArgs e)
{
Parent.Controls.Add(_suggLb);
Parent.Controls.SetChildIndex(_suggLb, 0);
_suggLb.Top = Top + Height - 3;
_suggLb.Left = Left + 3;
_suggLb.Width = Width - 20;
_suggLb.Font = new Font("Segoe UI", 9);
}
protected override void OnLocationChanged(EventArgs e)
{
base.OnLocationChanged(e);
_suggLb.Top = Top + Height - 3;
_suggLb.Left = Left + 3;
}
protected override void OnSizeChanged(EventArgs e)
{
base.OnSizeChanged(e);
_suggLb.Width = Width - 20;
}
#endregion
#region visibility of suggest box
protected override void OnLostFocus(EventArgs e)
{
// _suggLb can only getting focused by clicking (because TabStop is off)
// --> click-eventhandler 'SuggLbOnClick' is called
if (!_suggLb.Focused)
HideSuggBox();
base.OnLostFocus(e);
}
private void SuggLbOnClick(object sender, EventArgs eventArgs)
{
Text = _suggLb.Text;
Focus();
}
private void HideSuggBox()
{
_suggLb.Visible = false;
}
protected override void OnDropDown(EventArgs e)
{
HideSuggBox();
base.OnDropDown(e);
}
#endregion
#region keystroke events
/// <summary>
/// if the suggest-ListBox is visible some keystrokes
/// should behave in a custom way
/// </summary>
/// <param name="e"></param>
protected override void OnPreviewKeyDown(PreviewKeyDownEventArgs e)
{
if (!_suggLb.Visible)
{
base.OnPreviewKeyDown(e);
return;
}
switch (e.KeyCode)
{
case Keys.Down:
if (_suggLb.SelectedIndex < _suggBindingList.Count - 1)
_suggLb.SelectedIndex++;
return;
case Keys.Up:
if (_suggLb.SelectedIndex > 0)
_suggLb.SelectedIndex--;
return;
case Keys.Enter:
Text = _suggLb.Text;
Select(0, Text.Length);
_suggLb.Visible = false;
return;
case Keys.Escape:
HideSuggBox();
return;
}
base.OnPreviewKeyDown(e);
}
private static readonly Keys[] KeysToHandle = new[] { Keys.Down, Keys.Up, Keys.Enter, Keys.Escape };
protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
// the keysstrokes of our interest should not be processed be base class:
if (_suggLb.Visible && KeysToHandle.Contains(keyData))
return true;
return base.ProcessCmdKey(ref msg, keyData);
}
#endregion
}
void fillCari()//fill Cari-med dropdown with values
{
try
{
string connectionString = "Data Source=CMDLAP126;Initial Catalog=Carimed_Inventory;User ID = sa; Password = 123456;";
SqlConnection con2 = new SqlConnection(connectionString);
con2.Open();
string query = "SELECT DISTINCT Item_Description FROM dbo.Carimed";
SqlCommand cmd2 = new SqlCommand(query, con2);
SqlDataReader dr2 = cmd2.ExecuteReader();
while (dr2.Read())
{
string cari_des = dr2.GetString(dr2.GetOrdinal("Item_Description"));
suggestComboBox1.Items.Add(cari_des);
suggestComboBox1.Text.Trim();
}
//con2.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
string query = "SELECT DISTINCT Item_Description FROM dbo.Carimed";
string query = "SELECT Item_Description FROM dbo.Carimed";