CODEWITHSUNDEEP
c#silverlightwindows-phone-7
JohnDotOwl
JohnDotOwl

Reputation: 3755

Keynotfound exception

Keynotfound exception

public int getLastUniqueID()
{
    int lastID = 0;
    IsolatedStorageSettings uc = IsolatedStorageSettings.ApplicationSettings;

    List<sMedication> medicationList = (List<sMedication>)uc["medicationList"];

    foreach (sMedication temp in medicationList) {
        lastID = temp.UniqueID;
    }

    return lastID;
}

It is happening on the following line:

List<sMedication> medicationList = (List<sMedication>)uc["medicationList"];

Upvotes: 0

Views: 176

Answers (2)

Chris Dworetzky
Chris Dworetzky

Reputation: 950

You're going to run into problems with that approach because, if the key "medicationList" isn't there in the retrieved Application Settings, then it'll throw an exception like you have witnessed.

Try the following:

uc.TryGetValue<List<sMedication>>("medicationList", out medicationList)
if (medicationList != null)
{
   foreach(sMedication temp in medicationList)
   {
       lastID = temp.UniqueID;
       return lastID;
   }
}
else
{
   // handle the key not being there
}

Upvotes: 1

test
test

Reputation: 36

As the error indicate that key was not found in the dictionary before accessing the value check if the key exists or not 

if(uc.Contains("medicationList"))
{
   // your code here
}

Upvotes: 2

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