[#251] 修复表达式值获取

samples/Sample.MySql/Controllers/WeatherForecastController.cs

@@ -194,6 +194,14 @@ namespace Sample.MySql.Controllers
                     name = o.Key.Name,
                     count = o.Count()
                 }).ToListAsync();
+
+            var asyncEnumerator = _defaultTableDbContext.Set<SysTest>().AsAsyncEnumerable();
+            await foreach (var sysTest in asyncEnumerator)
+            {
+                await Task.Delay(1000);
+                Console.WriteLine("1");
+            }
+
             var x=await   (from ut in _defaultTableDbContext.Set<SysTest>()
              from uu in _defaultTableDbContext.Set<SysUserMod>()
              where ut.Id == uu.Id

src/ShardingCore/Sharding/Visitors/ShardingExpressionVisitor.cs

@@ -45,7 +45,7 @@ namespace ShardingCore.Core.Internal.Visitors
                 case ConstantExpression e:
                     return e.Value;
                 case NewExpression e:
-                    return e.Constructor?.Invoke(e.Arguments.Select(a => ((ConstantExpression)a).Value).ToArray());
+                    return e.Constructor?.Invoke(e.Arguments.Select(GetExpressionValue).ToArray());
 
                 case MemberExpression e when e.Member is FieldInfo field:
                     return field.GetValue(

test/ShardingCore.CommonTest/ShardingTableTime.cs

@@ -95,8 +95,10 @@ namespace ShardingCore.CommonTest
             var times2 = new []{queryTime,queryTime2};
             var obj1 = new {time=new DateTime(2022, 1, 2)};
             var dateTime = (DateTime?)new DateTime(2022, 1, 2);
+            var day = 2;
             var queryables=new List<IQueryable<TestTimeEntity>>()
             {
+                new List<TestTimeEntity>().AsQueryable().Where(o=>o.Time== new DateTime(2022, 1, day)),
                 new List<TestTimeEntity>().AsQueryable().Where(o=>o.Time== dateTime),
                 new List<TestTimeEntity>().AsQueryable().Where(o=>dateTime==o.Time ),
                 new List<TestTimeEntity>().AsQueryable().Where(o=>o.Time== new DateTime(2022, 1, 2)),