Spring.NET Unable to cast to type Spring.Collections.Set

Question

I'm using Spring.NET to configure some objects, and I've written a FactoryObject to make configuring a Quartz.NET calendar bearable.

It has a property shown below, that of course we expect to configure with Spring.NET

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Quartz.Impl.Calendar;
using Spring.Objects.Factory;

namespace My.Package.TaskExecutorDemo
{

    /// <summary>
    /// TODO:
    /// </summary>
    public class WeeklyCalendarFactoryObject : WeeklyCalendar, IFactoryObject
    {
        private ISet<DayOfWeek> _daysOfWeek = new HashSet<DayOfWeek>();

        public ISet<DayOfWeek> DaysOfWeekExcluded
        {
            get { return _daysOfWeek; }
            set
            {
                if (value == null)
                {
                    throw new ArgumentNullException("DaysOfWeekExcluded");
                }
                _daysOfWeek = value;
            }
        }
        
        //Everything else ...
    }
}

It is configured by the following object definition.

<object id="weeklyCalendar" type="My.Package.TaskExecutorDemo.WeeklyCalendarFactoryObject, TaskExecutorDemo">
 <property name="DaysOfWeekExcluded">
   <set element-type="System.DayOfWeek, mscorlib">
     <value>Friday</value>
     <value>Saturday</value>
     <value>Sunday</value>
   </set>
 </property>
</object>

But at start up this throws the following exception:

Spring.Objects.Factory.ObjectCreationException: Error creating object with name 'weeklyCalendar' defined in 'config [C:\Users\username\some\path\TaskExecutorDemo\bin\Debug\TaskExecutorDemo.exe.Config#spring/objects] line 7' : Initialization of object failed : Unable to cast object of type System.Collections.Generic.HashSet`1[System.DayOfWeek]' to type 'Spring.Collections.ISet'.

System.InvalidCastException: Unable to cast object of type 'System.Collections.Generic.HashSet`1[System.DayOfWeek]' to type 'Spring.Collections.ISet'.

But I don't reference Spring.Collections.ISet anywhere in my code. How do I get Spring.NET to configure my ISet property correctly?

Answer 1

According to the docs on setting generic collection values is not supported for ISet<T>; only the generic collections IDictionary<TKey, TValue> and IList<T> are supported. Try passing an explicit configuring an explicit HashSet<T> using the constructor taking an IEnumerable<T>.

Answer 2

Set section in your xml-config creates Spring.Collections.ISet object

Try this:

<object id="weeklyCalendar" type="My.Package.TaskExecutorDemo.WeeklyCalendarFactoryObject, TaskExecutorDemo">
  <property name="DaysOfWeekExcluded">
    <object type="System.Collections.Generic.HashSet&lt;System.DayOfWeek>">
      <constructor-arg name="collection" type="System.Collections.Generic.IEnumerable&lt;System.DayOfWeek>">
        <list element-type="System.DayOfWeek">
          <value>Friday</value>
          <value>Saturday</value>
          <value>Sunday</value>
        </list>
      </constructor-arg>
    </object>
  </property>
</object>