- 增加 GlobalFilter.ApplyIf 创建动态过滤器；

FreeSql/Internal/GlobalFilter.cs

@@ -16,22 +16,35 @@ namespace FreeSql.Internal
         {
             public int Id { get; internal set; }
             public string Name { get; internal set; }
+            internal Func<bool> Condition { get; set; }
             public LambdaExpression Where { get; internal set; }
         }
         /// <summary>
-        /// 创建一个过滤器
+        /// 创建一个过滤器<para></para>
+        /// 提示：判断登陆身份，请参考资料 AsyncLocal
         /// </summary>
         /// <typeparam name="TEntity"></typeparam>
         /// <param name="name">名字</param>
         /// <param name="where">表达式</param>
         /// <returns></returns>
-        public GlobalFilter Apply<TEntity>(string name, Expression<Func<TEntity, bool>> where)
+        public GlobalFilter Apply<TEntity>(string name, Expression<Func<TEntity, bool>> where) => ApplyIf(name, () => true, where);
+        /// <summary>
+        /// 创建一个动态过滤器，当 condition 返回值为 true 时才生效<para></para>
+        /// 场景：当登陆身份是管理员，则过滤条件不生效<para></para>
+        /// 提示：判断登陆身份，请参考资料 AsyncLocal
+        /// </summary>
+        /// <typeparam name="TEntity"></typeparam>
+        /// <param name="name">名字</param>
+        /// <param name="condition">委托，返回值为 true 时才生效</param>
+        /// <param name="where">表达式</param>
+        /// <returns></returns>
+        public GlobalFilter ApplyIf<TEntity>(string name, Func<bool> condition, Expression<Func<TEntity, bool>> where)
         {
             if (name == null) throw new ArgumentNullException(nameof(name));
             if (where == null) return this;
 
             _filters.TryGetValue(name, out var item);
-            if (item == null) item = new Item { Id = ++_id, Name = name };
+            if (item == null) item = new Item { Id = ++_id, Name = name, Condition = condition };
 
             var newParameter = Expression.Parameter(typeof(TEntity), $"gf{_id}");
             var newlambda = Expression.Lambda<Func<TEntity, bool>>(
@@ -44,6 +57,6 @@ namespace FreeSql.Internal
         }
         public void Remove(string name) => _filters.TryRemove(name ?? throw new ArgumentNullException(nameof(name)), out var _);
 
-        public List<Item> GetFilters() => _filters.Values.OrderBy(a => a.Id).ToList();
+        public List<Item> GetFilters() => _filters.Values.Where(a => a.Condition?.Invoke() != false).OrderBy(a => a.Id).ToList();
     }
 }