How do I save a string collection to application settings in c# wpf?

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I'm struggling with this problem right now. I wanted to save the treeview state default to an application settings.

I have this code that saves all isChecked items to the list.
And i've also added "CheckedPaths" with string collection type, but when
I've tried to save it to the settings.default, it won't save, instead it gives an error that cannot save to string collection.

(PS. Sorry for this noob question but I'm still a beginner for this. Thanks :) )

C#

List<string> hashs = new List<string>();

        public bool? IsChecked
        {
            get { return _isChecked; }
            set
            {
                _isChecked = value;
                SetIsChecked(_isChecked, true, false);
                if (_isChecked == true)
                {
                    hashs.Add(this.FullPathName);

                }
                else
                {
                    hashs.Remove(this.FullPathName);
                }
            }
}

Posted 1-Mar-15 10:29am

Silver Bel

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tgrt · Accepted Answer · 2015-03-01T11:00:00

StringCollection is a specific type. You cannot convert from List<t> to it. However, you don't really have to use StringCollection. That's just in the designer.

You have two choices
(1) Save your strings to StringCollection instead
(2) Change the auto-generated code in Settings.Designer.cs

I recommend the first, because changing auto-generated code can be problematic. The one issue I know is that you'll need to repeat the change anytime you add a setting through the designer.

The second option is simple to implement. Open the Settings.Designer.cs file and change the System.Collections.Specialized.StringCollection to System.Collections.Generic.List<string>. That's it, at that point you can write your normal code to manipulate the setting (it's not like you're going to use the designer anyway for the value).

C#

if (Settings.Default.TestSetting == null) {
   // create collection
   Settings.Default.TestSetting = myValues;
   Settings.Default.Save();
}

// do whatever

Silver Bel · Accepted Answer · 2015-03-02T01:28:00

Thanks for the help! figured it out.

C#

System.Collections.Specialized.StringCollection _checkedPaths = CheckedList.CheckedLists.CheckPaths;
public bool? IsChecked
{
    get { return _isChecked; }
    set
    {
        _isChecked = value;
        SetIsChecked(_isChecked, true, false);
        if (_isChecked == true)
        {
                if (UserSettings.Default.CheckedNodes == null)
                {
                    UserSettings.Default.CheckedNodes = new System.Collections.Specialized.StringCollection();
                }

                if (CheckIfPathExists(this.FullPathName) == false)
                {
                    UserSettings.Default.CheckedNodes.Add(this.FullPathName);
                    UserSettings.Default.Save();
                }
        }
        else
        {
            UserSettings.Default.CheckedNodes.Remove(this.FullPathName);
            UserSettings.Default.Save();
        }
    }
}
}

and in my view model, I added this to my previous code that builds thee treeview.

C#

foreach (string _fileItem in UserSettings.Default.CheckedNodes)
                        {
                            if (UserSettings.Default.CheckedNodes.Contains(item.FullPathName))
                            {
                                item.IsChecked = true;
                            }
                        }

How do I save a string collection to application settings in c# wpf?

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