From e41dab0656edbc53c268b86abfedab6ad19dbc67 Mon Sep 17 00:00:00 2001
From: sunkaixuan <610262374@qq.com>
Date: Wed, 8 Nov 2017 16:06:56 +0800
Subject: [PATCH] Optimization code

---
 Src/Asp.Net/SqlSugar/ExpressionsToSql/Common/ExpressionTool.cs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Src/Asp.Net/SqlSugar/ExpressionsToSql/Common/ExpressionTool.cs b/Src/Asp.Net/SqlSugar/ExpressionsToSql/Common/ExpressionTool.cs
index fae3ce837..09778df27 100644
--- a/Src/Asp.Net/SqlSugar/ExpressionsToSql/Common/ExpressionTool.cs
+++ b/Src/Asp.Net/SqlSugar/ExpressionsToSql/Common/ExpressionTool.cs
@@ -41,6 +41,8 @@ namespace SqlSugar
                 case ExpressionType.Multiply:
                 case ExpressionType.MultiplyChecked:
                     return "*";
+                case ExpressionType.Coalesce:
+                    throw new Exception("Expression no support ?? ,Use SqlFunc.IsNull");
                 default:
                     Check.ThrowNotSupportedException(string.Format(ErrorMessage.OperatorError, expressiontype.ToString()));
                     return null;