SqlServer TypeMapper: Some parameters require casts

Author: alex-kulakov

Orm/Xtensive.Orm.SqlServer/Sql.Drivers.SqlServer/v09/TypeMapper.cs

@@ -22,6 +22,22 @@ internal class TypeMapper : Sql.TypeMapper
 
     private ValueRange<DateTime> dateTimeRange;
 
+    public override bool IsParameterCastRequired(Type type)
+    {
+      switch (Type.GetTypeCode(type)) {
+        case TypeCode.Byte:
+        case TypeCode.SByte:
+        case TypeCode.Int16:
+        case TypeCode.UInt16:
+          return true;
+      }
+      if (type == typeof(Guid)) {
+        return true;
+      }
+
+      return base.IsParameterCastRequired(type);
+    }
+
     public override void BindSByte(DbParameter parameter, object value)
     {
       parameter.DbType = DbType.Int16;