edit

XLAB/PsvDataService.cs

@@ -259,7 +259,7 @@ SELECT @@ROWCOUNT;";
             }
         }
 
-        public void DeleteSpnmtpItem(int id)
+        public SpnmtpDeleteResult DeleteSpnmtpItem(int id)
         {
             if (id <= 0)
             {
@@ -275,21 +275,42 @@ SELECT @@ROWCOUNT;";
             try
             {
                 using (var connection = CreateConnection())
-                using (var command = new SqlCommand(sql, connection))
                 {
                     connection.Open();
-                    command.CommandTimeout = 60;
-                    command.Parameters.Add("@Id", SqlDbType.Int).Value = id;
-
-                    if (Convert.ToInt32(command.ExecuteScalar()) == 0)
+                    var blockers = LoadSpnmtpDeleteBlockers(connection, id);
+                    if (blockers.Count > 0)
                     {
-                        throw new InvalidOperationException("Запись SPNMTP для удаления не найдена.");
+                        return new SpnmtpDeleteResult
+                        {
+                            IsDeleted = false,
+                            WarningMessage = CreateSpnmtpDeleteBlockedMessage(blockers)
+                        };
                     }
+
+                    using (var command = new SqlCommand(sql, connection))
+                    {
+                        command.CommandTimeout = 60;
+                        command.Parameters.Add("@Id", SqlDbType.Int).Value = id;
+
+                        if (Convert.ToInt32(command.ExecuteScalar()) == 0)
+                        {
+                            throw new InvalidOperationException("Запись SPNMTP для удаления не найдена.");
+                        }
+                    }
+
+                    return new SpnmtpDeleteResult
+                    {
+                        IsDeleted = true
+                    };
                 }
             }
             catch (SqlException ex) when (ex.Number == 547)
             {
-                throw new InvalidOperationException("Запись справочника используется в связанных данных и не может быть удалена.", ex);
+                return new SpnmtpDeleteResult
+                {
+                    IsDeleted = false,
+                    WarningMessage = CreateSpnmtpDeleteBlockedMessage(ex)
+                };
             }
         }
 
@@ -2337,6 +2358,69 @@ WHERE NMTP = @Name
                 innerException);
         }
 
+        private static List<DeleteBlockerInfo> LoadSpnmtpDeleteBlockers(SqlConnection connection, int id)
+        {
+            const string sql = @"
+SELECT blocker.TableName, blocker.LinkCount
+FROM
+(
+    SELECT N'TIPS' AS TableName, COUNT(*) AS LinkCount
+    FROM dbo.TIPS
+    WHERE IDSPNMTP = @Id
+) blocker
+WHERE blocker.LinkCount > 0
+ORDER BY blocker.TableName;";
+
+            var blockers = new List<DeleteBlockerInfo>();
+
+            using (var command = new SqlCommand(sql, connection))
+            {
+                command.CommandTimeout = 60;
+                command.Parameters.Add("@Id", SqlDbType.Int).Value = id;
+
+                using (var reader = command.ExecuteReader())
+                {
+                    while (reader.Read())
+                    {
+                        blockers.Add(new DeleteBlockerInfo
+                        {
+                            TableName = GetString(reader, "TableName"),
+                            RowCount = GetInt32(reader, "LinkCount")
+                        });
+                    }
+                }
+            }
+
+            return blockers;
+        }
+
+        private static string CreateSpnmtpDeleteBlockedMessage(IEnumerable<DeleteBlockerInfo> blockers)
+        {
+            var blockerList = blockers == null
+                ? new List<DeleteBlockerInfo>()
+                : blockers.Where(delegate(DeleteBlockerInfo blocker) { return blocker != null; }).ToList();
+            var details = blockerList.Count == 0
+                ? "TIPS"
+                : string.Join(", ", blockerList.Select(delegate(DeleteBlockerInfo blocker)
+                {
+                    return string.Format("{0}: {1}", blocker.TableName, blocker.RowCount);
+                }));
+
+            return string.Format(
+                "Запись SPNMTP не может быть удалена, потому что на неё есть ссылки в таблицах: {0}. Подтверждённое ограничение БД: FK_TIPS_SPNMTP (dbo.TIPS.IDSPNMTP -> dbo.SPNMTP.IDSPNMTP).",
+                details);
+        }
+
+        private static string CreateSpnmtpDeleteBlockedMessage(SqlException ex)
+        {
+            if (ex != null && ex.Message.IndexOf("FK_TIPS_SPNMTP", StringComparison.OrdinalIgnoreCase) >= 0)
+            {
+                return "Запись SPNMTP не может быть удалена, потому что на неё есть ссылки в таблице TIPS. Ограничение БД: FK_TIPS_SPNMTP (dbo.TIPS.IDSPNMTP -> dbo.SPNMTP.IDSPNMTP).";
+            }
+
+            return "Запись SPNMTP не может быть удалена из-за ограничения ссылочной целостности в БД.";
+        }
+
         private static bool IsSpnmtpDuplicateNameViolation(SqlException ex)
         {
             return ex != null

XLAB/PsvModels.cs

@@ -353,6 +353,13 @@ namespace XLAB
         public string SpecialName { get; set; }
     }
 
+    internal sealed class SpnmtpDeleteResult
+    {
+        public bool IsDeleted { get; set; }
+
+        public string WarningMessage { get; set; }
+    }
+
     internal static class SpnmtpDirectoryRules
     {
         public const int NameMaxLength = 150;

XLAB/SpnmtpDirectoryWindowViewModel.cs

@@ -132,7 +132,13 @@ namespace XLAB
 
             RunMutationOperation(async delegate
             {
-                await Task.Run(delegate { _service.DeleteSpnmtpItem(selectedItem.Id); });
+                var deleteResult = await Task.Run(delegate { return _service.DeleteSpnmtpItem(selectedItem.Id); });
+                if (!deleteResult.IsDeleted)
+                {
+                    _dialogService.ShowWarning(deleteResult.WarningMessage);
+                    return;
+                }
+
                 await RefreshCoreAsync(null);
                 _dialogService.ShowInfo("Запись справочника удалена.");
             });
@@ -255,12 +261,28 @@ namespace XLAB
 
         private async void RunBusyOperation(Func<Task> operation)
         {
-            await ExecuteBusyOperationAsync(operation);
+            try
+            {
+                await ExecuteBusyOperationAsync(operation);
+            }
+            catch (Exception ex)
+            {
+                IsBusy = false;
+                _dialogService.ShowError(ex.Message);
+            }
         }
 
         private async void RunMutationOperation(Func<Task> operation)
         {
-            await ExecuteMutationOperationAsync(operation);
+            try
+            {
+                await ExecuteMutationOperationAsync(operation);
+            }
+            catch (Exception ex)
+            {
+                IsBusy = false;
+                _dialogService.ShowError(ex.Message);
+            }
         }
 
         private void UpdateStatus()