How to access a generic property argument in the following example:

How to access a generic property argument in the following example:

• SQLDataMonkey

  Hi,

  the ContainsKey method will tell you if a key exists in the dictionary i.e.

  Dictionary<string, object> dict = new Dictionary<string, object>();

  dict.ContainsKey("abcd");

  Mark.

  
  
  

• sailorsurprise

  You need to loop through all items in dictionary and to get the right one with same key value. For that you must use structure KeyValuePair:
          public bool CheckSessionKey(string keyName)
          {
              foreach (KeyValuePair<string, object> kvp in m_Session)
              {
                  if (kvp.Key == keyName)
                     return true;
              }
              return false;
          }

  but this method should be called before you access the property, because you can't pass the keyName value. I have just show you how to loop trough Dictionary elements.

  
  
  

• ccrockatt

  Thank you, boban.s. If you are talking about calling the CheckSessionKey from the caller's side then it is not neccesary in my case as I already can do something like:

  if (Session.Contains(KeyName))
  {
      return Session[KeyName];
  }
  else
  {
     return new object;
  }

  
  What I am trying to avoid is writing the "if" block above for every time I need to call "Session[KeyName]";

  of course as a last resort I always can do something like:

  ======== CALLING SIDE =========

  object MyObject1 = this.session(sKeyName);
  object MyObject2 = this.session(sKeyName)
  object MyObject3 = this.session(sKeyName)
  //... n times I need to call session

  
  private object session(string sKeyName)
  {
     if (Session.Contains(KeyName))
     {
         return Session[KeyName];
     }
     else
     {
        return new object;
     }
  }

  ======== RECEIVING SIDE =========

  private static Dictionary<string, object> m_Session = new Dictionary<string, object>();

  public static Dictionary<string, object> Session
  {
        get
         {
              return m_Session;
         }
          set { m_Session = value; }
  }

  ==============================

  but I was trying to see if there is a way to know the KeyName value INSIDE the  Session property on RECEIVING side.

  
  The rest of the folks answered:
  Thank you for your replies. The mistake I was making is that I thought that the value of KeyName is being passed to the RECEIVING side in the example above. I don't know what I've been smoking yesterday :) Of course the retrieval of the key/value pair happens on the CALLING side, therefore there is no way I can check for the KeyName existance inside the Session property on the RECEIVING side. That pretty much answers my original question. Please feel free to comment/add.

  
  

• Jon Watte

  Hi,

  The signature is:   public bool ContainsKey (TKey key)

  
  "abcd" mentioned above is the keyname you want to check.
  

  
  
  

• fods

  Thank you, Mark. I guess I had to be more specific in my question. I need to know what to pass to ContainsKey method. I need to know how to retrieve the key value ("abcd" in your example above).
  

• Zadoras

  Hi,

  you can do the following:

  Dictionary<string, object> dict = new Dictionary<string, object>();

  if (dict.ContainsKey("abcd"))

  {

  object o = dict["abcd"];

  //do some work...

  }

  Mark.

  
  
  
• How to access a generic property argument in the following example: