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c# reflection

Posted on 2009-05-06
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Last Modified: 2012-05-06
I am venturing into C# reflection.  I have figured out to get the properties, and set them but not how to add them back to the class.  Any help appreciated
public class SessionProperties
      {
            public string ToSectionId { get; set; }
            public string FromSectionId { get; set; }
            public string TemplateId { get; set; }
            public string PanelToEnable { get; set; }
            public string TemplateTypeId { get; set; }
      }
 
 public class SessionClass
      {
            public SessionProperties Section { get; set; }
            public SessionProperties SubSection { get; set; }
            public SessionProperties SubSubSection { get; set; }
            public SessionProperties ChapterMenu { get; set; }
            public SessionProperties Scroller { get; set; }
            public SessionProperties RelatedContent { get; set; }
      }
 
public static void SetSessionClassProperty(string sessionPropertyObjectType, string propertyName, string propertyValue)
            {
                  if (System.Web.HttpContext.Current.Session["SessionClass"] != null)
                  {
 
                        //we have 2 classes to loop thru 
                        // the SessionClass
                        //and the SessionProperties
 
                        //first the SessionClass
                        SessionClass thisClass = (SessionClass)System.Web.HttpContext.Current.Session["SessionClass"];
                        //loop thru properties
                        Type thisClassType = thisClass.GetType();
 
 
                        PropertyInfo[] thisClassProperties = thisClassType.GetProperties();
 
                        // Now let's create a new instance of this Type.
                                    object SessionClassObj = Activator.CreateInstance(thisClassType);
 
                        foreach (PropertyInfo thisClassProperty in thisClassProperties)
                        {
                              //get designated SessionProperties
                              if (thisClassProperty.Name == sessionPropertyObjectType)
                              {
                                    //now loop thru the SessionProperties properties
                                    Type sessPropType = typeof(SessionProperties);
                                    PropertyInfo[] sessPropProperties = sessPropType.GetProperties();
 
                                    // Now let's create a new instance of this Type.
                                    object obj = Activator.CreateInstance(sessPropType);
 
                                    foreach (PropertyInfo sessPropProperty in sessPropProperties)
                                    {
                                          if (sessPropProperty.Name == propertyName)
                                          {
                                                sessPropProperty.SetValue(obj, propertyValue, null);
                                                
                                          }
                                       //   thisClassProperty.ReflectedType.Name
                                      
                                    }
                                    //now add the property back to the class
                                   //can't figure out how to do this
                                   
 
                              }
                        }
                        //thisClass is not updated when code executes
                      System.Web.HttpContext.Current.Session["SessionClass"] = thisClass;
                  }
                  
 
            }

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Question by:emw1
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3 Comments
 
LVL 12

Expert Comment

by:wht1986
ID: 24319230
Below is my code how I did this.  1st I added some code to initialize SessionProperties classes of the SessionClass class. Otherwise i had nulls.  But basically since you know the property of the first loop is a SessionProperties class, go ahead and get the value and then you can do a setvalue on it.  Hopefully the code below explains it.
public void SetSessionClassProperty(string sessionPropertyObjectType, string propertyName, string propertyValue)
{
 
    SessionClass thisClass = (SessionClass)System.Web.HttpContext.Current.Session["SessionClass"];
    Type thisClassType = thisClass.GetType();
 
    PropertyInfo[] thisClassProperties = thisClassType.GetProperties();
 
    foreach (PropertyInfo thisClassProperty in thisClassProperties)
    {
        //get designated SessionProperties
        if (thisClassProperty.Name == sessionPropertyObjectType)
        {
 
            SessionProperties targetSessionProperty = (SessionProperties)thisClassProperty.GetValue(thisClass, null);
 
            //now loop thru the SessionProperties properties
            Type sessPropType = targetSessionProperty.GetType();
            PropertyInfo[] sessPropProperties = sessPropType.GetProperties();
 
            foreach (PropertyInfo sessPropProperty in sessPropProperties)
            {
                if (sessPropProperty.Name == propertyName)
                    sessPropProperty.SetValue(targetSessionProperty, propertyValue, null);
            }
        }
    }
 
    System.Web.HttpContext.Current.Session["SessionClass"] = thisClass;
}

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Accepted Solution

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wht1986 earned 250 total points
ID: 24319306
Having said that, there is no need to loop unless its dynamic and there is a chance the string might not be found.  If you know you will always send valid arguements to the method, i would cut to the chase and use the below
public void SetSessionClassProperty(string sessionPropertyObjectType, string propertyName, string propertyValue)
{
    SessionClass thisClass = (SessionClass)System.Web.HttpContext.Current.Session["SessionClass"];
 
    Type SessionClassType = (new SessionClass()).GetType();
    Type SessionPropertiesType = (new SessionProperties()).GetType();
 
    SessionProperties targetSessionProperty = (SessionProperties)SessionClassType.GetProperty(sessionPropertyObjectType).GetValue(thisClass, null);
    SessionPropertiesType.GetProperty(propertyName).SetValue(targetSessionProperty, propertyValue, null);
 
    System.Web.HttpContext.Current.Session["SessionClass"] = thisClass;
}

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Author Closing Comment

by:emw1
ID: 31578651
Thank You - It worked Great!
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