-

OrmTest/UnitTest/ExpressionTest/Where.cs

@@ -28,6 +28,7 @@ namespace OrmTest.UnitTest
                 whereSingle5();
                 whereSingle6();
                 whereSingle7(new Student() { Id = 1 });
+                //whereSingle8(new Student() { Id = 1 });
                 WhereMultiple1();
                 WhereMultiple2();
           
@@ -150,6 +151,18 @@ namespace OrmTest.UnitTest
                 new SugarParameter("@Id0",1)
             }, "whereSingle7");
         }
+
+        private void whereSingle8(Student st)
+        {
+            Expression<Func<Student, bool>> exp = it => it.Name == null;
+            ExpressionContext expContext = new ExpressionContext();
+            expContext.Resolve(exp, ResolveExpressType.WhereSingle);
+            var value = expContext.Result.GetString();
+            var pars = expContext.Parameters;
+            base.Check(value, pars, "( [Name] is @Id0 )", new List<SugarParameter>() {
+                new SugarParameter("@Id0",1)
+            }, "whereSingle8");
+        }
     }
 
     public class WhereConst

SqlSugar/ExpressionsToSql/ResolveItems/BinaryExpressionResolve.cs

@@ -33,7 +33,8 @@ namespace SqlSugar
                 var lsrb = !leftIsBinary && rightBinary;
                 var lbrb = rightBinary && leftIsBinary;
                 var lsbs = !leftIsBinary && !rightBinary;
-                if (!base.Context.Result.Contains(ExpressionConst.Format0))
+                var isBegin = !base.Context.Result.Contains(ExpressionConst.Format0);
+                if (isBegin)
                 {
                     base.Context.Result.Append(ExpressionConst.Format3);
                     base.Context.Result.Append(ExpressionConst.Format0);
@@ -46,11 +47,14 @@ namespace SqlSugar
                 base.Expression = leftExpression;
                 base.IsLeft = true;
                 base.Start();
-                base.Context.Result.Replace(ExpressionConst.Format1+parameter.Index,operatorValue);
                 base.IsLeft = false;
                 base.Expression = rightExpression;
                 base.Start();
                 base.IsLeft = null;
+                base.Context.Result.Replace(ExpressionConst.Format1 + parameter.Index, operatorValue);
+                if (lsbs) {
+
+                }
                 base.Context.Result.Append(ExpressionConst.Format4);
                 if (parameter.BaseExpression is BinaryExpression && parameter.IsLeft == true)
                 {