feat(control): support selected extended search columns

插件库/Lskj.Control/Model/ExtendedReturnSupport.cs

@@ -78,6 +78,11 @@ namespace Lskj.Control.Model
         }
 
         public static string BuildSearchSql(string sourceSql, DataColumnCollection columns, int maxRows)
+        {
+            return BuildSearchSql(sourceSql, columns, maxRows, string.Empty);
+        }
+
+        public static string BuildSearchSql(string sourceSql, DataColumnCollection columns, int maxRows, string searchField)
         {
             if (columns == null || columns.Count == 0)
             {
@@ -88,17 +93,50 @@ namespace Lskj.Control.Model
                 throw new ArgumentOutOfRangeException("maxRows", "最大返回行数必须大于零。");
             }
 
+            List<DataColumn> searchColumns = new List<DataColumn>();
+            string selectedField = (searchField ?? string.Empty).Trim();
+            if (selectedField.Length == 0)
+            {
+                foreach (DataColumn column in columns)
+                {
+                    if (IsSearchableColumn(column.ColumnName))
+                    {
+                        searchColumns.Add(column);
+                    }
+                }
+            }
+            else
+            {
+                foreach (DataColumn column in columns)
+                {
+                    if (string.Equals(column.ColumnName, selectedField, StringComparison.OrdinalIgnoreCase) &&
+                        IsSearchableColumn(column.ColumnName))
+                    {
+                        searchColumns.Add(column);
+                        break;
+                    }
+                }
+            }
+            if (searchColumns.Count == 0)
+            {
+                if (selectedField.Length > 0)
+                {
+                    throw new InvalidOperationException(string.Format("搜索字段“{0}”不存在或不允许查询。", selectedField));
+                }
+                throw new InvalidOperationException("搜索 SQL 没有返回任何可查询列。");
+            }
+
             string alias = QuoteIdentifier(SearchAlias);
             StringBuilder builder = new StringBuilder();
             builder.AppendFormat("select top ({0}) * from ({1}) as {2} where ", maxRows, NormalizeSourceSql(sourceSql), alias);
 
-            for (int i = 0; i < columns.Count; i++)
+            for (int i = 0; i < searchColumns.Count; i++)
             {
                 if (i > 0) builder.Append(" or ");
                 builder.Append("convert(nvarchar(4000), ");
                 builder.Append(alias);
                 builder.Append('.');
-                builder.Append(QuoteIdentifier(columns[i].ColumnName));
+                builder.Append(QuoteIdentifier(searchColumns[i].ColumnName));
                 builder.Append(") like ");
                 builder.Append(SearchParameterName);
                 builder.Append(" escape N'\\'");
@@ -106,6 +144,12 @@ namespace Lskj.Control.Model
             return builder.ToString();
         }
 
+        public static bool IsSearchableColumn(string columnName)
+        {
+            return !string.IsNullOrWhiteSpace(columnName) &&
+                !columnName.StartsWith("_", StringComparison.Ordinal);
+        }
+
         public static string BuildLikeParameterValue(string keyword)
         {
             string value = keyword ?? string.Empty;