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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

by:
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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