Insertable Updateable Dictionary BUG

Src/Asp.Net/SqlServerTest/Config.cs

@@ -8,8 +8,8 @@ namespace OrmTest
 {
     public class Config
     {
-        public static string ConnectionString = "server=.;uid=sa;pwd=sasa;database=SqlSugar4XTest";
-        public static string ConnectionString2 = "server=.;uid=sa;pwd=sasa;database=SQLSUGAR4XTEST";
-        public static string ConnectionString3 = "server=.;uid=sa;pwd=sasa;database=sqlsugar4xtest";
+        public static string ConnectionString = "server=.;uid=sa;pwd=@jhl85661501;database=SqlSugar4XTest";
+        public static string ConnectionString2 = "server=.;uid=sa;pwd=@jhl85661501;database=SQLSUGAR4XTEST";
+        public static string ConnectionString3 = "server=.;uid=sa;pwd=@jhl85661501;database=sqlsugar4xtest";
     }
 }

Src/Asp.Net/SqlServerTest/Demos/2_Update.cs

@@ -74,7 +74,8 @@ namespace OrmTest.Demo
 
             var dt = new Dictionary<string, object>();
             dt.Add("id", 1);
-            dt.Add("name", "1");
+            dt.Add("name", null);
+            dt.Add("createTime", DateTime.Now);
             var t66 = db.Updateable(dt).AS("student").With(SqlWith.UpdLock).ExecuteCommand();
         }
     }

Src/Asp.Net/SqlServerTest/Demos/3_Insert.cs

@@ -63,6 +63,7 @@ namespace OrmTest.Demo
 
             var dt = new Dictionary<string, object>();
             dt.Add("name", "1");
+            dt.Add("CreateTime", null);
             var t66 = db.Insertable(dt).AS("student").ExecuteReturnIdentity();
         }
     }

Src/Asp.Net/SqlSugar/Abstract/InsertableProvider/InsertableProvider.cs

@@ -289,7 +289,7 @@ namespace SqlSugar
                     Value = column.Value,
                     DbColumnName = column.Key,
                     PropertyName = column.Key,
-                    PropertyType = UtilMethods.GetUnderType(column.Value.GetType()),
+                    PropertyType = column.Value == null? DBNull.Value.GetType(): UtilMethods.GetUnderType(column.Value.GetType()),
                     TableId = i
                 };
                 if (columnInfo.PropertyType.IsEnum())

Src/Asp.Net/SqlSugar/Abstract/UpdateProvider/UpdateableProvider.cs

@@ -280,7 +280,7 @@ namespace SqlSugar
                     Value = column.Value,
                     DbColumnName =column.Key,
                     PropertyName = column.Key,
-                    PropertyType = UtilMethods.GetUnderType(column.Value.GetType()),
+                    PropertyType = column.Value==null?DBNull.Value.GetType():UtilMethods.GetUnderType(column.Value.GetType()),
                     TableId = i
                 };
                 if (columnInfo.PropertyType.IsEnum())