Operation is not valid due to the current state of the object.

Question

Operation is not valid due to the current state of the object.

Peter Reilly 20

Directly copied from Microsoft Learn

Windows.Storage.ApplicationDataContainer localSettings = Windows.Storage.ApplicationData.Current.LocalSettings;

Results in this error:

System.InvalidOperationException: 'Operation is not valid due to the current state of the object.'

VS2022, Windows 11, C# 11, .Net 8

I have review all the previous answers to this problem from varios sources, but nothing applies to my situation.

Anonymous

2025-03-20T14:33:10.1066667+00:00

Hi @Peter Reilly , Welcome to Microsoft Q&A,

It seems rare to get this error from your code, can you provide steps to reproduce it? Windows.Storage.ApplicationData seems to be commonly used in UWP, what project are you using? You mentioned Microsoft Learn, what specific tutorial are you using, (can you provide a link)
Peter Reilly 20 Reputation points

2025-03-20T14:56:30.2366667+00:00

I am working in WinForms. I am not in a tutorial, whenever I hit a problem developing my app, I search for a solution. I've created an App.config for user settings persistance and am attempting to connect to it to read and configure the app at start up.
Anonymous

2025-03-21T06:14:16.54+00:00

Hi, are there any specific steps to reproduce the problem?

Peter Reilly 20

No. it's just as the included code. it happens on both forms I have it on.

public partial class StdGraphics : Form

{

Graphics TheseGraphics;

public ApplicationDataContainer localSettings;

private Boolean ImageGridVisible = false;

int GridSize = 50;

Color BackColour = Color.LightGray;

int MaxGridSize = 50;

int MinGridSize = 1;

Single GridPenWidth = 1.0F;

int SnapToXVal;

int SnapToYVal;

bool SnapTo = false;

int[] XGridCoordinates;

int[] YGridCoordinates;

Misc Misc1 = new Misc();

public StdGraphics()

{

    InitializeComponent();

}

private void StdGraphics_Load(object sender, EventArgs e)

{

    try

    {

    1)    localSettings = ApplicationData.Current.LocalSettings;

     2)   Windows.Storage.ApplicationDataContainer localSettings = Windows.Storage.ApplicationData.Current.LocalSettings;

        if (!ApplicationData.Current.LocalSettings.Equals(null))

        {

            localSettings = ApplicationData.Current.LocalSettings;

            MaxGridSize = (int)localSettings.Values["MaxGridSize"];

            MinGridSize = (int)localSettings.Values["MinGridSize"];

            GridSize = (int)localSettings.Values["GridSize"];

            ImageGridVisible = (bool)localSettings.Values["ImageGridVisible"];

            SnapTo = (bool)localSettings.Values["SnapTo"];

        }

    }

    catch (Exception fault)

    {

        Misc1.writeErrorLog(fault.Message);

    }

I have tried both versions 1 and 2. 1 has using Windows.Storage in the header.

Peter Reilly 20

No. the exception occurs on the line ::

Windows.Storage.ApplicationDataContainer localSettings = Windows.Storage.ApplicationData.Current.LocalSettings;

I have tried all combinations of 1, 2 & 3. The exception occurs on the line above always. I cannot get to 3.

using Windows.Storage;

public partial class StdGraphics : Form

{

 Graphics TheseGraphics;

 public ApplicationDataContainer localSettings;

 private Boolean ImageGridVisible = false;

 int GridSize = 50;

 Color BackColour = Color.LightGray;

 int MaxGridSize = 50;

 int MinGridSize = 1;

 Single GridPenWidth = 1.0F;

 int SnapToXVal;

 int SnapToYVal;

 bool SnapTo = false;

 int[] XGridCoordinates;

 int[] YGridCoordinates;

 Misc Misc1 = new Misc();

 public StdGraphics()

 {

     InitializeComponent();

 }

 private void StdGraphics_Load(object sender, EventArgs e)

 {

     try

     {

         1 ) localSettings = ApplicationData.Current.LocalSettings;

         2 ) Windows.Storage.ApplicationDataContainer localSettings = Windows.Storage.ApplicationData.Current.LocalSettings;

         if (!ApplicationData.Current.LocalSettings.Equals(null))

         {

             3 ) localSettings = ApplicationData.Current.LocalSettings;

             MaxGridSize = (int)localSettings.Values["MaxGridSize"];

             MinGridSize = (int)localSettings.Values["MinGridSize"];

             GridSize = (int)localSettings.Values["GridSize"];

             ImageGridVisible = (bool)localSettings.Values["ImageGridVisible"];

             SnapTo = (bool)localSettings.Values["SnapTo"];

         }

     }

     catch (Exception fault)

     {

         Misc1.writeErrorLog(fault.Message);

     }

     toolStripLabelGridSize.Text = GridSize.ToString();

     toolStripBtnGridOnOff.BackColor = BackColour;

 }

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Anonymous

2025-03-20T14:33:10.1066667+00:00

Hi @Peter Reilly , Welcome to Microsoft Q&A,

It seems rare to get this error from your code, can you provide steps to reproduce it? Windows.Storage.ApplicationData seems to be commonly used in UWP, what project are you using? You mentioned Microsoft Learn, what specific tutorial are you using, (can you provide a link)
Peter Reilly 20 Reputation points

2025-03-20T14:56:30.2366667+00:00

I am working in WinForms. I am not in a tutorial, whenever I hit a problem developing my app, I search for a solution. I've created an App.config for user settings persistance and am attempting to connect to it to read and configure the app at start up.
Anonymous

2025-03-21T06:14:16.54+00:00

Hi, are there any specific steps to reproduce the problem?
Peter Reilly 20 Reputation points

2025-03-21T16:47:21.27+00:00

No. it's just as the included code. it happens on both forms I have it on.

public partial class StdGraphics : Form

{

Graphics TheseGraphics; public ApplicationDataContainer localSettings; private Boolean ImageGridVisible = false; int GridSize = 50; Color BackColour = Color.LightGray; int MaxGridSize = 50; int MinGridSize = 1; Single GridPenWidth = 1.0F; int SnapToXVal; int SnapToYVal; bool SnapTo = false; int[] XGridCoordinates; int[] YGridCoordinates; Misc Misc1 = new Misc(); public StdGraphics() { InitializeComponent(); } private void StdGraphics_Load(object sender, EventArgs e) { try { 1) localSettings = ApplicationData.Current.LocalSettings; 2) Windows.Storage.ApplicationDataContainer localSettings = Windows.Storage.ApplicationData.Current.LocalSettings; if (!ApplicationData.Current.LocalSettings.Equals(null)) { localSettings = ApplicationData.Current.LocalSettings; MaxGridSize = (int)localSettings.Values["MaxGridSize"]; MinGridSize = (int)localSettings.Values["MinGridSize"]; GridSize = (int)localSettings.Values["GridSize"]; ImageGridVisible = (bool)localSettings.Values["ImageGridVisible"]; SnapTo = (bool)localSettings.Values["SnapTo"]; } } catch (Exception fault) { Misc1.writeErrorLog(fault.Message); }

I have tried both versions 1 and 2. 1 has using Windows.Storage in the header.
Peter Reilly 20 Reputation points

2025-03-21T17:21:48.42+00:00

No. the exception occurs on the line ::

Windows.Storage.ApplicationDataContainer localSettings = Windows.Storage.ApplicationData.Current.LocalSettings;

I have tried all combinations of 1, 2 & 3. The exception occurs on the line above always. I cannot get to 3.

using Windows.Storage;

public partial class StdGraphics : Form

{

Graphics TheseGraphics; public ApplicationDataContainer localSettings; private Boolean ImageGridVisible = false; int GridSize = 50; Color BackColour = Color.LightGray; int MaxGridSize = 50; int MinGridSize = 1; Single GridPenWidth = 1.0F; int SnapToXVal; int SnapToYVal; bool SnapTo = false; int[] XGridCoordinates; int[] YGridCoordinates; Misc Misc1 = new Misc(); public StdGraphics() { InitializeComponent(); } private void StdGraphics_Load(object sender, EventArgs e) { try { 1 ) localSettings = ApplicationData.Current.LocalSettings; 2 ) Windows.Storage.ApplicationDataContainer localSettings = Windows.Storage.ApplicationData.Current.LocalSettings; if (!ApplicationData.Current.LocalSettings.Equals(null)) { 3 ) localSettings = ApplicationData.Current.LocalSettings; MaxGridSize = (int)localSettings.Values["MaxGridSize"]; MinGridSize = (int)localSettings.Values["MinGridSize"]; GridSize = (int)localSettings.Values["GridSize"]; ImageGridVisible = (bool)localSettings.Values["ImageGridVisible"]; SnapTo = (bool)localSettings.Values["SnapTo"]; } } catch (Exception fault) { Misc1.writeErrorLog(fault.Message); } toolStripLabelGridSize.Text = GridSize.ToString(); toolStripBtnGridOnOff.BackColor = BackColour; }

Answer 1

Anonymous

Hi @Peter Reilly , Welcome to Microsoft Q&A,

Windows.Storage.ApplicationData is not suitable for use in Winforms.

If you just want to read and configure the application at startup, you can use xml or Properties.Settings (.NET built-in function), both of which are good choices.

In VS Solution Explorer, find Properties → Settings.settings, add keys such as MaxGridSize, MinGridSize, and set default values.

You can call it directly in the program like this:

MaxGridSize = Properties.Settings.Default.MaxGridSize;
Properties.Settings.Default.MaxGridSize = 100;
Properties.Settings.Default.Save();

Best Regards,

Jiale

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Peter Reilly 20 Reputation points

2025-03-27T10:30:13.83+00:00

Thank you Jiale

I have bypassed the problem whilst waiting for a solution by changing the file name from App.config to Appconfig.xml and creating methods to read and write my settings. Just one question. Does using Property Settings as you've described access the std App.config file?

Regards

Peter
Peter Reilly 20 Reputation points

2025-03-27T11:58:10.8733333+00:00

OK this is fun. I've created a Settings.settings file and loaded my original settings, and added a few I have decided would be better user defined rather than hard coded. Not only has the settings file been created and updated but my originl App.Config file shows all the same data in the same order and style as the settings file. It is in effect a direct copy, but I can't access the App.config using Windows.Storage.ApplicationData methods which are specifically defined for this purpose.

I shall continue to use the Properties methods you advocated as they work for me, but there is something strange going on in the background. Perhaps we should call in Mudler and Scully.

Thanks for your help, the app is progressing well.

Peter

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Operation is not valid due to the current state of the object.

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