Optimize price-list name search for large catalogs.

Replace O(n^2) per-keystroke rebuild with indexed unique names, a single-pass filter, and debounce so typing stays responsive with ~15k items.

src/ElectronicPharmacy/UserControls/UCPriceList.cs

@@ -49,6 +49,11 @@ namespace Электронная_Фармация.UserControls
         ModernSplitContainer splitNameMgBrowse;
         ModernDataGridView dgvBrowseNames;
         ModernDataGridView dgvBrowseMg;
+        List<string> _uniqueBaseNames = new List<string>();
+        Dictionary<string, List<string>> _mgByBaseName =
+            new Dictionary<string, List<string>>(StringComparer.OrdinalIgnoreCase);
+        Timer _searchDebounceTimer;
+        const int SearchDebounceMs = 180;
         static readonly Regex DosageRegex = new Regex(
             @"(\d+(?:[.,]\d+)?\s*(?:мг|мкг|г|мл|МЕ|ме)\b)",
             RegexOptions.IgnoreCase | RegexOptions.Compiled);
@@ -407,11 +412,77 @@ namespace Электронная_Фармация.UserControls
 
             EnsureDerivedBrowseColumns(tablePrice);
             _fullPriceTable = tablePrice;
+            RebuildBrowseIndex(tablePrice);
             _selectedBaseName = string.Empty;
             _selectedMg = string.Empty;
             ShowBrowseView();
         }
 
+        private void RebuildBrowseIndex(DataTable tablePrice)
+        {
+            var names = new SortedSet<string>(StringComparer.OrdinalIgnoreCase);
+            var mgMap = new Dictionary<string, SortedSet<string>>(StringComparer.OrdinalIgnoreCase);
+
+            foreach (DataRow row in tablePrice.Rows)
+            {
+                var baseName = row["Базовое наименование"]?.ToString() ?? string.Empty;
+                if (string.IsNullOrWhiteSpace(baseName))
+                {
+                    continue;
+                }
+
+                names.Add(baseName);
+                if (!mgMap.TryGetValue(baseName, out var dosages))
+                {
+                    dosages = new SortedSet<string>(StringComparer.OrdinalIgnoreCase);
+                    mgMap[baseName] = dosages;
+                }
+
+                dosages.Add(row["МГ"]?.ToString() ?? string.Empty);
+            }
+
+            _uniqueBaseNames = names.ToList();
+            _mgByBaseName = new Dictionary<string, List<string>>(StringComparer.OrdinalIgnoreCase);
+            foreach (var pair in mgMap)
+            {
+                var list = new List<string>(pair.Value.Count);
+                foreach (var dosage in pair.Value)
+                {
+                    list.Add(string.IsNullOrEmpty(dosage) ? EmptyMgDisplay : dosage);
+                }
+
+                _mgByBaseName[pair.Key] = list;
+            }
+        }
+
+        private void EnsureSearchDebounceTimer()
+        {
+            if (_searchDebounceTimer != null)
+            {
+                return;
+            }
+
+            _searchDebounceTimer = new Timer { Interval = SearchDebounceMs };
+            _searchDebounceTimer.Tick += (_, __) =>
+            {
+                _searchDebounceTimer.Stop();
+                ResetBrowseToNames();
+            };
+        }
+
+        private void ScheduleBrowseSearchRefresh(bool immediate = false)
+        {
+            EnsureSearchDebounceTimer();
+            _searchDebounceTimer.Stop();
+            if (immediate)
+            {
+                ResetBrowseToNames();
+                return;
+            }
+
+            _searchDebounceTimer.Start();
+        }
+
         private void HideOptionalColumn(string columnName)
         {
             if (dgvPriceList.Columns.Contains(columnName))
@@ -506,55 +577,51 @@ namespace Электронная_Фармация.UserControls
             }
 
             var search = (GoodsFilter ?? string.Empty).Trim();
-            var namesTable = new DataTable();
+            IList<string> namesToShow;
-            namesTable.Columns.Add("Наименование", typeof(string));
+            if (string.IsNullOrWhiteSpace(search))
-
+            {
-            var seen = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
+                namesToShow = _uniqueBaseNames;
+            }
+            else
+            {
+                var matching = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
                 foreach (DataRow row in _fullPriceTable.Rows)
                 {
                     var baseName = row["Базовое наименование"]?.ToString() ?? string.Empty;
-                if (string.IsNullOrWhiteSpace(baseName) || !seen.Add(baseName))
+                    if (string.IsNullOrWhiteSpace(baseName) || matching.Contains(baseName))
                     {
                         continue;
                     }
 
-                if (!string.IsNullOrWhiteSpace(search))
+                    var drugName = row["Наименование"]?.ToString() ?? string.Empty;
-                {
+                    var mgText = row["МГ"]?.ToString() ?? string.Empty;
-                    var keep = false;
-                    foreach (DataRow candidate in _fullPriceTable.Rows)
-                    {
-                        if (!string.Equals(candidate["Базовое наименование"]?.ToString(), baseName, StringComparison.OrdinalIgnoreCase))
-                        {
-                            continue;
-                        }
-
-                        var drugName = candidate["Наименование"]?.ToString() ?? string.Empty;
-                        var mgText = candidate["МГ"]?.ToString() ?? string.Empty;
                     if (baseName.IndexOf(search, StringComparison.OrdinalIgnoreCase) >= 0
                         || drugName.IndexOf(search, StringComparison.OrdinalIgnoreCase) >= 0
                         || mgText.IndexOf(search, StringComparison.OrdinalIgnoreCase) >= 0)
                     {
-                            keep = true;
+                        matching.Add(baseName);
-                            break;
                     }
                 }
 
-                    if (!keep)
+                namesToShow = matching
+                    .OrderBy(n => n, StringComparer.OrdinalIgnoreCase)
+                    .ToList();
+            }
+
+            var namesTable = new DataTable();
+            namesTable.Columns.Add("Наименование", typeof(string));
+            namesTable.BeginLoadData();
+            foreach (var baseName in namesToShow)
             {
-                        continue;
-                    }
-                }
-
                 namesTable.Rows.Add(baseName);
             }
-
+            namesTable.EndLoadData();
-            namesTable.DefaultView.Sort = "Наименование ASC";
-            var sortedNames = namesTable.DefaultView.ToTable();
 
             try
             {
                 _suppressBrowseEvents = true;
-                dgvBrowseNames.DataSource = sortedNames;
+                dgvBrowseNames.SuspendLayout();
+                dgvBrowseNames.DataSource = namesTable;
                 ConfigureSingleColumnGrid(dgvBrowseNames, "Наименование");
                 ClearMgPanel();
 
@@ -569,6 +636,7 @@ namespace Электронная_Фармация.UserControls
             }
             finally
             {
+                dgvBrowseNames.ResumeLayout();
                 _suppressBrowseEvents = false;
             }
 
@@ -595,28 +663,18 @@ namespace Электронная_Фармация.UserControls
             var mgTable = new DataTable();
             mgTable.Columns.Add("МГ", typeof(string));
 
-            var seen = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
+            if (_mgByBaseName.TryGetValue(baseName, out var dosages))
-            foreach (DataRow row in _fullPriceTable.Rows)
             {
-                if (!string.Equals(row["Базовое наименование"]?.ToString(), baseName, StringComparison.OrdinalIgnoreCase))
+                foreach (var dosage in dosages)
                 {
-                    continue;
+                    mgTable.Rows.Add(dosage);
+                }
             }
 
-                var dosage = row["МГ"]?.ToString() ?? string.Empty;
-                if (!seen.Add(dosage))
-                {
-                    continue;
-                }
-
-                mgTable.Rows.Add(string.IsNullOrEmpty(dosage) ? EmptyMgDisplay : dosage);
-            }
-
-            mgTable.DefaultView.Sort = "МГ ASC";
             try
             {
                 _suppressBrowseEvents = true;
-                dgvBrowseMg.DataSource = mgTable.DefaultView.ToTable();
+                dgvBrowseMg.DataSource = mgTable;
                 ConfigureSingleColumnGrid(dgvBrowseMg, "МГ");
                 dgvBrowseMg.ClearSelection();
             }
@@ -990,7 +1048,7 @@ namespace Электронная_Фармация.UserControls
 
             GoodsFilter = GoodsFilter.Substring(0, GoodsFilter.Length - 1);
             txtSearchGoodNameInPriceList.Text = GoodsFilter;
-            ResetBrowseToNames();
+            ScheduleBrowseSearchRefresh(immediate: GoodsFilter.Length == 0);
 
             if (GoodsFilter.Length == 0)
             {
@@ -1501,7 +1559,7 @@ select strftime('%Y-%m-%d','{OrderDate}'),
         {
             txtSearchGoodNameInPriceList.Text = string.Empty;
             GoodsFilter = string.Empty;
-            ResetBrowseToNames();
+            ScheduleBrowseSearchRefresh(immediate: true);
             //loadPriceList(string.Empty);
         }
 
@@ -1560,6 +1618,27 @@ and tempOrder.GoodName = PriceList.GoodName
         string GoodsFilter = string.Empty;
         string stringIWantBuy = string.Empty;
 
+        private static bool IsGoodsSearchKey(char keyChar, bool allowDigitsAndSeparators = true)
+        {
+            if ((keyChar >= 'A' && keyChar <= 'Z')
+                || (keyChar >= 'a' && keyChar <= 'z')
+                || (keyChar >= 'А' && keyChar <= 'Я')
+                || (keyChar >= 'а' && keyChar <= 'я')
+                || keyChar == (char)Keys.Subtract)
+            {
+                return true;
+            }
+
+            if (!allowDigitsAndSeparators)
+            {
+                return false;
+            }
+
+            return (keyChar >= '0' && keyChar <= '9')
+                || keyChar == ' '
+                || keyChar == '.'
+                || keyChar == ',';
+        }
 
         private void dgvPriceList_KeyPress(object sender, KeyPressEventArgs e)
         {
@@ -1573,7 +1652,7 @@ and tempOrder.GoodName = PriceList.GoodName
                 {
                     txtSearchGoodNameInPriceList.Text = string.Empty;
                     GoodsFilter = string.Empty;
-                    ResetBrowseToNames();
+                    ScheduleBrowseSearchRefresh(immediate: true);
                 }
 
                 return;
@@ -1613,67 +1692,27 @@ and tempOrder.GoodName = PriceList.GoodName
 
             if (_browseMode != PriceBrowseMode.Offers)
             {
-                if ((e.KeyChar >= 'A' && e.KeyChar <= 'Z')
+                if (IsGoodsSearchKey(e.KeyChar))
-                    || (e.KeyChar >= 'a' && e.KeyChar <= 'z')
-                    || (e.KeyChar >= 'А' && e.KeyChar <= 'Я')
-                    || (e.KeyChar >= 'а' && e.KeyChar <= 'я')
-                    || (e.KeyChar == (Char)Keys.Subtract))
                 {
                     dgvPriceList.ClearSelection();
                     GoodsFilter += e.KeyChar.ToString();
                     txtSearchGoodNameInPriceList.Text = GoodsFilter;
-                    ResetBrowseToNames();
+                    ScheduleBrowseSearchRefresh();
-                    if (dgvBrowseNames != null && dgvBrowseNames.Rows.Count == 0)
+                    timerForResetSearch.Enabled = true;
-                    {
+                    timerForResetSearch.Start();
-                        UiDialogs.ShowInfo("Подходящий товар не найден.", "Поиск", FindForm());
-                        GoodsFilter = string.Empty;
-                        txtSearchGoodNameInPriceList.Text = string.Empty;
-                        ResetBrowseToNames();
-                    }
                 }
 
                 return;
             }
 
-            if ((e.KeyChar >= 'A' && e.KeyChar <= 'Z') || (e.KeyChar >= 'a' && e.KeyChar <= 'z') || (e.KeyChar >= 'А' && e.KeyChar <= 'Я') || (e.KeyChar >= 'а' && e.KeyChar <= 'я') || (e.KeyChar == (Char)Keys.Subtract))
+            if (IsGoodsSearchKey(e.KeyChar, allowDigitsAndSeparators: false))
-            {
-                if (e.KeyChar == (Char)Keys.Enter)
-                {
-
-                }
-                else
             {
                 dgvPriceList.ClearSelection();
                 GoodsFilter += e.KeyChar.ToString();
                 txtSearchGoodNameInPriceList.Text = GoodsFilter;
-
+                ScheduleBrowseSearchRefresh();
-                    #region поиск без фильтрации (НЕ РАБОТАЕТ)
+                timerForResetSearch.Enabled = true;
-                    //foreach(DataGridViewRow row in dgvPriceList.Rows)
+                timerForResetSearch.Start();
-                    //{
-                    //    //string cellValue = row.Cells["Наименование"].Value.ToString().ToLower();
-                    //    if (row.Cells[2].Value.ToString().Equals(GoodsFilter))
-                    //    {
-                    //        int indexOfSearchValue = row.Index;
-                    //        dgvPriceList.Rows[indexOfSearchValue].Selected = true;
-                    //    }
-                    //}
-                    #endregion
-
-                    #region старый способ поиска с фильтрацией данных
-                    if (!string.IsNullOrEmpty(GoodsFilter))
-                    {
-                        ResetBrowseToNames();
-                        if (dgvPriceList.Rows.Count == 0)
-                        {
-                            UiDialogs.ShowInfo("Подходящий товар не найден.", "Поиск", FindForm());
-                            GoodsFilter = string.Empty;
-
-                            txtSearchGoodNameInPriceList.Text = string.Empty;
-                            ResetBrowseToNames();
-                        }
-                    }
-                    #endregion
-                }
                 return;
             }
             else if ((e.KeyChar >= (Char)Keys.D1 && e.KeyChar <= (Char)Keys.D9) ||
@@ -2511,7 +2550,7 @@ and SumOrderedItems = '{SumOrder}'";
         {
             txtSearchGoodNameInPriceList.Text = string.Empty;
             GoodsFilter = string.Empty;
-            ResetBrowseToNames();
+            ScheduleBrowseSearchRefresh(immediate: true);
             timerForResetSearch.Enabled = false;
             timerForResetSearch.Stop();
         }