Exp to sql bug

Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/BaseResolve.cs

@@ -337,7 +337,8 @@ namespace SqlSugar
                 if (this.Context.Result.IsLockCurrentParameter == false)
                 {
                     var expression = ((UnaryExpression)item).Operand as MemberExpression;
-                    if (expression.Expression == null)
+                    var isDateTimeNow = ((UnaryExpression)item).Operand.ToString() == "DateTime.Now";
+                    if (expression.Expression == null&&!isDateTimeNow)
                     {
                         this.Context.Result.CurrentParameter = parameter;
                         this.Context.Result.IsLockCurrentParameter = true;
@@ -348,7 +349,7 @@ namespace SqlSugar
                         this.Context.Result.Append(this.Context.GetAsString(asName, parameter.CommonTempData.ObjToString()));
                         this.Context.Result.CurrentParameter = null;
                     }
-                    else if (expression.Expression is ConstantExpression)
+                    else if (expression.Expression is ConstantExpression||isDateTimeNow)
                     {
                         string parameterName = this.Context.SqlParameterKeyWord + "constant" + this.Context.ParameterIndex;
                         this.Context.ParameterIndex++;