From 6bbe723eac052cb977d96a70c7deb5cf429173d6 Mon Sep 17 00:00:00 2001
From: IGeekFan <luoyunchong@foxmail.com>
Date: Mon, 30 Nov 2020 20:18:25 +0800
Subject: [PATCH] =?UTF-8?q?Updated=20=E8=A1=A8=E8=BE=BE=E5=BC=8F=E5=87=BD?=
 =?UTF-8?q?=E6=95=B0=20(markdown)?=
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---
 表达式函数.md | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/表达式函数.md b/表达式函数.md
index cb9c4ba..43a1dd0 100644
--- a/表达式函数.md
+++ b/表达式函数.md
@@ -1,5 +1,24 @@
 这是 FreeSql 非常特色的功能之一，深入细化函数解析，所支持的类型基本都可以使用对应的表达式函数，例如 日期、字符串、IN查询、数组（PostgreSQL的数组）、字典（PostgreSQL HStore)等等。
 
+## 动态Lambda表达式
+- And、Or扩展方法 [LambadaExpressionExtensions.cs](https://github.com/dotnetcore/FreeSql/blob/master/FreeSql/Extensions/LambadaExpressionExtensions.cs)
+
+示例
+```
+Expression<Func<T, bool>> where = a => a.id == Guid.Empty;
+where = where.And(b => b.num > 0);
+where = where.Or(b => b.num > 0);
+```
+
+动态拼Or.先搞个false条件 然后拼Lambda条件
+```
+Expression<Func<T, bool>> where = a =>false;
+if(xxx)
+{
+   where = where.Or(b => b.num > 0);  
+}
+```
+
 ## In查询
 
 ```csharp