- 增加 ISelect.OrderBy 重载，与 WhereIf 相同行为；

- 修复 Aop.ParseExpression 使用 FreeParse 方法死循环的 bug；

FreeSql/Interface/Curd/ISelect/ISelect0.cs

@@ -203,12 +203,20 @@ namespace FreeSql {
 		TSelect Having(string sql, object parms = null);
 
 		/// <summary>
-		/// 按原生sql语法排序，OrderBy("count(name) + ?cc", new { cc = 1 })
+		/// 按原生sql语法排序，OrderBy("count(name) + ?cc desc", new { cc = 1 })
 		/// </summary>
 		/// <param name="sql">sql语法</param>
 		/// <param name="parms">参数</param>
 		/// <returns></returns>
 		TSelect OrderBy(string sql, object parms = null);
+		/// <summary>
+		/// 按原生sql语法排序，OrderBy(true, "count(name) + ?cc desc", new { cc = 1 })
+		/// </summary>
+		/// <param name="condition">true 时生效</param>
+		/// <param name="sql">sql语法</param>
+		/// <param name="parms">参数</param>
+		/// <returns></returns>
+		TSelect OrderBy(bool condition, string sql, object parms = null);
 
 		/// <summary>
 		/// 查询向后偏移行数

FreeSql/Interface/Curd/ISelect/ISelect1.cs

@@ -288,11 +288,26 @@ namespace FreeSql {
 		/// <returns></returns>
 		ISelect<T1> OrderBy<TMember>(Expression<Func<T1, TMember>> column);
 		/// <summary>
+		/// 按列排序，OrderBy(true, a => a.Time)
+		/// </summary>
+		/// <typeparam name="TMember"></typeparam>
+		/// <param name="condition">true 时生效</param>
+		/// <param name="column"></param>
+		/// <returns></returns>
+		ISelect<T1> OrderBy<TMember>(bool condition, Expression<Func<T1, TMember>> column);
+		/// <summary>
 		/// 按列倒向排序，OrderByDescending(a => a.Time)
 		/// </summary>
 		/// <param name="column">列</param>
 		/// <returns></returns>
 		ISelect<T1> OrderByDescending<TMember>(Expression<Func<T1, TMember>> column);
+		/// <summary>
+		/// 按列倒向排序，OrderByDescending(true, a => a.Time)
+		/// </summary>
+		/// <param name="condition">true 时生效</param>
+		/// <param name="column">列</param>
+		/// <returns></returns>
+		ISelect<T1> OrderByDescending<TMember>(bool condition, Expression<Func<T1, TMember>> column);
 
 		/// <summary>
 		/// 贪婪加载导航属性，如果查询中已经使用了 a.Parent.Parent 类似表达式，则可以无需此操作