我的代码如下。它完美无缺：
private void frmSearch_Load(object sender, EventArgs e)
{
//Get DB records for textBox search
dt = Talika.PanktiLa("select * from VM"); //note - dt is a datatable. Talika.Panktila is a class I have created for retrieving records from the database. If you need the code to answer this question, let me know and I will post it here
//Enable AutoComplete for textBox
//Do this only if Vendor Master has records
if (dt.Rows.Count != 0)
{
//Create the list to be used as custom source.
var source = new AutoCompleteStringCollection();
foreach (DataRow dr in dt.Rows)
source.Add(dr["VNAME"].ToString());
//Bind to textBox.
txtSearch.AutoCompleteCustomSource = source;
txtSearch.AutoCompleteMode = AutoCompleteMode.Suggest;
txtSearch.AutoCompleteSource = AutoCompleteSource.CustomSource;
}
}
现在，我想添加一些高级搜索功能。
EG。如果我想搜索＆＃34; Apple Computer Inc ＆＃34;
我输入时会出现：
＆＃34;的计算机＆＃34;或其中的一部分
或＆＃34; Inc ＆＃34;
或＆＃34; ACI ＆＃34; （名称的缩写）
我可以将此功能添加到现有的自动完成代码中，还是我必须从头开始取消它并编写代码？
答案 0 :(得分：0)
将ACO_NOPREFIXFILTERING传递给IAutoComplete2.SetOptions以禁用前缀过滤。 WinForms没有扩展点允许您访问下划线COM API，因此您需要禁用Winforms自动完成并使用IAutoComplete :: Init连接您自己的自动完成对象。为此目的，WinForms的IEnumString实现不公开，你需要编写自己的。
在文本框的TextChanged事件中，根据文本框的当前内容更改候选列表。然后调用IAutoCompleteDropDown :: ResetEnumerator来更新下拉列表。
答案 1 :(得分：0)
我无法从任何样本中获得满意的代码，因此我设计了自己的代码。下面是代码。它完美地运作。它唯一没有做的是按首字母搜索，现在这很好。它需要一个文本框，列表框和一个按钮来工作。希望有人能从中受益。
namespace MM
{
public partial class frmSearch : Form
{
DataTable dt = new DataTable();
DataRow[] passrow = new DataRow[1]; //to hold a particular row of datagridview
bool jod = true; //True - add new record, false - edit record
public frmSearch()
{
InitializeComponent();
}
private void frmSearch_Load(object sender, EventArgs e)
{
}
private void txtSearch_Enter(object sender, EventArgs e)
{
//Get DB records for textBox search
dt = Talika.PanktiLa("select * from VM");
}
private void txtSearch_MouseHover(object sender, EventArgs e)
{
toolTip1.Show("Press Enter to search", txtSearch);
}
private void txtSearch_KeyDown(object sender, KeyEventArgs e)
{
//If ENTER is pressed
//Go to ADD NEW button if textBox is empty
//Load Vendor Master form if text is present
if (e.KeyCode == Keys.Return)
if (txtSearch.Text == String.Empty)
this.SelectNextControl(ActiveControl, true, true, true, true);
else
Load_Vendor_Master();
//If DOWN ARROW is pressed
//Focus on listbox if textBox has text
//Focus on ADD NEW button if textBox is blank
if (e.KeyCode == Keys.Down)
{
if (txtSearch.Text != String.Empty)
{
this.SelectNextControl(ActiveControl, true, true, true, true);
lstSearch.SelectedIndex = 0;
}
else if (txtSearch.Text == String.Empty)
this.SelectNextControl(ActiveControl, true, true, true, true);
}
//If ESC is pressed
//Clear contents of textBox
if (e.KeyCode == Keys.Escape)
txtSearch.Text = String.Empty;
//If RIGHT ARROW is pressed
//Go to ADD NEW button
if (e.KeyCode == Keys.Right)
this.SelectNextControl(ActiveControl, true, true, true, true);
}
private void txtSearch_TextChanged(object sender, EventArgs e)
{
//Hide listbox if textbox is empty
if (txtSearch.Text == String.Empty)
{
lstSearch.Hide();
return;
}
//Proceed only if Vendor Master has records
if (dt.Rows.Count != 0)
{
//Clear listbox so that new results can be populated.
lstSearch.Items.Clear();
//Populate listbox based on search results.
foreach (DataRow dr in dt.Rows)
{
//Have to convert to upper case, else search doesnt work effectively.
string s = dr["VNAME"].ToString().ToUpper();
//Populate listBox.
if (s.Contains(txtSearch.Text.ToUpper()))
lstSearch.Items.Add(s);
}
//Show listBox
lstSearch.Visible = true;
}
}
private void txtSearch_KeyUp(object sender, KeyEventArgs e)
{
}
private void lstSearch_KeyDown(object sender, KeyEventArgs e)
{
//If ENTER is pressed
//Populate textBox with listBox item
//Put focus back on textBox
if (e.KeyCode == Keys.Enter)
{
//Populate textBox with selected item
txtSearch.Text = lstSearch.SelectedItem.ToString();
//Put focus on textBox
this.SelectNextControl(ActiveControl, false, true, true, true);
//Hide listBox
lstSearch.Visible = false;
//Load Vendor Master form
Load_Vendor_Master();
}
//If cursor in on the first item of listBox
//And UP ARROW is pressed
//Highlight the textbox
if (lstSearch.SelectedIndex == 0)
if (e.KeyCode == Keys.Up)
this.SelectNextControl(ActiveControl, false, true, true, true);
//If BACKSPACE is pressed
//Delete last character of textBox
//Set focus on textBox
if (e.KeyCode == Keys.Back)
{
//Do this only if textbox is not empty
if (txtSearch.Text != String.Empty)
{
//Delete last char
txtSearch.Text = txtSearch.Text.Substring(0, txtSearch.Text.Length - 1);
//Set focus on textBox
this.SelectNextControl(ActiveControl, false, true, true, true);
//Set cursor at end of text
txtSearch.SelectionStart = txtSearch.TextLength;
}
}
//If ESC is pressed
//Hide listBox
//Clear textBox contents
//Set focus on textBox
if (e.KeyCode == Keys.Escape)
{
lstSearch.Visible = false;
txtSearch.Text = String.Empty;
this.SelectNextControl(ActiveControl, false, true, true, true);
}
//If letter or digit is pressed
//Type the char at the end of the text
//Set focus on textBox
bool isLetterOrDigit = char.IsLetterOrDigit((char) e.KeyCode);
if (isLetterOrDigit == true)
{
//Add the char to text
txtSearch.Text += (char)e.KeyCode;
//Set cursor at end of text
txtSearch.SelectionStart = txtSearch.TextLength;
//Set focus on textBox
this.SelectNextControl(ActiveControl, false, true, true, true);
}
}
private void Load_Vendor_Master()
{
//Hide listbox
lstSearch.Visible = false;
//Read dt for matching records
/* Replace("'", "''") helps to match names containing apostrophe.
Single apostrophe is a string delimiter,
hence it is replaced with two single apostrophes which is interpreted as a single apostrophe */
passrow = dt.Select("VNAME = '" + txtSearch.Text.Replace("'", "''") + "'");
//Set flag
jod = false; //Edit record
//Load vendor master form
//Do this only if datarow has rows (in this case, a single row)
if (passrow.Length != 0)
{
frmVM frmVM_edit = new frmVM(passrow[0], jod);
frmVM_edit.ShowDialog();
//Get updated DB records for textBox search
dt.Clear();
txtSearch_Enter(null, null);
}
}
private void btnAdd_Click(object sender, EventArgs e)
{
//Set flag
jod = true; //Add new record
//Load form
frmVM frmVM_add = new frmVM(null, jod);
frmVM_add.ShowDialog();
this.Close();
}
private void frmSearch_KeyDown(object sender, KeyEventArgs e)
{
//Close form when ESC key is pressed
//Do this only if textBox is blank
//Because ESC is also used to clear textBox
if (e.KeyCode == Keys.Escape)
if (txtSearch.Text == String.Empty)
this.Close();
}
private void lstSearch_SelectedIndexChanged(object sender, EventArgs e)
{
}
private void btnAdd_KeyDown(object sender, KeyEventArgs e)
{
//If RIGHT or LEFT arrow is pressed
//Go to textBox
if (e.KeyCode == Keys.Right || e.KeyCode == Keys.Left)
this.SelectNextControl(ActiveControl, false, true, true, true);
}
}
public static class Talika //This is declared in one form and can be accessed from any form in the entire solution without declaring it again
{
public static DataTable PanktiLa(string queryLe)
{
try
{
string connString = System.IO.File.ReadAllText(Application.StartupPath + "\\MM.ini") + " User ID = sa; Password = DEMO";
DataTable dt_local = new DataTable();
using (SqlConnection conn = new SqlConnection(connString))
{
SqlCommand cmd = new SqlCommand(queryLe, conn);
SqlDataAdapter adapter = new SqlDataAdapter();
conn.Open();
adapter.SelectCommand = cmd;
adapter.Fill(dt_local);
return (dt_local);
}
}
catch (Exception ex)
{
MessageBox.Show("Please contact the program vendor with this error code:\n\n" + ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
return (null);
}
}
}
}