Why my list<string> doesn´t save?

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Good Day, I Have A List<string> Saved In My App User Settings, this List is supposed to save the file paths of a openfiledialog to then deserialize it, but I already Called the method Save(); And even the method Upgrade(); After adding the strings to the list, but this strings doesn´t save. Why?

What I have tried:

To Save It:
private void ImportIcon_Click(object sender, EventArgs e)
{
IfSound();
openFileDialog1.Filter = "Analytica Files (*.analy) |*.analy";
openFileDialog1.Multiselect = true;
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
var Path = openFileDialog1.FileName;
foreach (string file in openFileDialog1.FileNames)
{
Settings.Default.FileList.Add(file);
Settings.Default.Save();
//Settings.Default.Upgrade();
}

Posted 9-Jul-18 12:25pm

SebGM2018

Updated 9-Jul-18 15:01pm

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an0ther1 · Answer 1 · 2018-07-09T15:02:00

Check the Setting Type. Application Settings cannot be updated without a custom handler - refer; Application Settings Overview | Microsoft Docs[^]
Use your debugger, if the setting is defined but not initialised, it will be null & you cannot add values to it - the blow code works in a Test application - the values are carried over restarts of the application - create a User Setting named TestList to test;

C#

if(Properties.Settings.Default.TestList == null)
    {
        MessageBox.Show("Not initialised");
    // Create a new List and Save to Settings        
    Properties.Settings.Default.TestList = new System.Collections.Specialized.StringCollection();
        Properties.Settings.Default.Save();
    }
    else if(Properties.Settings.Default.TestList.Count > 0)
    {
        // Create a message showing the last value in the list and the count of items
        string strMsg = string.Format("List is populated\r\nLast Value: {0}\r\nCount: {1}", Properties.Settings.Default.TestList[Properties.Settings.Default.TestList.Count - 1].ToString(), Properties.Settings.Default.TestList.Count.ToString());
           
    MessageBox.Show(strMsg);
    }
    else
    {
        MessageBox.Show("Currently empty");
    }

    string[] myTest = new string[] { "Value 1", "Value 2" };
    
    foreach(string myVal in myTest)
    {
        Properties.Settings.Default.TestList.Add(myVal);
    }
    Properties.Settings.Default.Save();

    if (Properties.Settings.Default.TestList.Count > 0)
    {
        MessageBox.Show("After populate\r\n" + Properties.Settings.Default.TestList[0].ToString()
            + "\r\nCount: " + Properties.Settings.Default.TestList.Count);
    }

Kind Regards