Reading json file from custom message box

JOHN JOHNNNY

Hi

I implemented a method in my app for json files in folder to read in a message box when i try to run in the emulator it throws the following exception "An exception of type 'System.NotImplementedException' occurred in DevotionJson.DLL but was not handled in user code"

Kindly view my code below for necessary correction

CustomMessageBox cmb;
        private void openMsgBox(object sender, RoutedEventArgs e)
        {
            // create new Stack panel
            StackPanel sp = new StackPanel() { Orientation = System.Windows.Controls.Orientation.Vertical };

            //get policy text from file
            string policy = getPolicy();

            //Create new label
            TextBlock tb = new TextBlock()
            {
                Text =policy,
                TextWrapping = TextWrapping.Wrap,
                FontSize = 25,
            };

            //Create new Scroll viewer
            ScrollViewer sv = new ScrollViewer()
            {
                VerticalScrollBarVisibility=ScrollBarVisibility.Auto,
                Height=500,
            };

            // add texblock in scroll viewer
            sv.Content = tb;





            //Add the controls to stack panel
            sp.Children.Add(sv);


            // Create new Custom Message Box instance
            cmb = new CustomMessageBox()
            {
                // Set its content to our Stack Panel
                Content = sp,

                Opacity = 0.98,

                // Left button of message box Button
                LeftButtonContent = "Accepts",

                //Right button of message Box
                RightButtonContent="Reject",
            };

            //Handle msg box click
            cmb.Dismissing += cmb_Dismissing;
            //Show the message box...
            cmb.Show();
        }

        private string getPolicy()
        {
            throw new NotImplementedException();
        }

        void cmb_Dismissing(object sender, DismissingEventArgs e)
        {
            if (e.Result==CustomMessageBoxResult.LeftButton)
            {
                MessageBox.Show("Now you can use this app.");
            }
            else
            {
                //do what you want
                MessageBox.Show("It's mandatory to accepts the T&C to use this app. Exiting from app.");
                App.Current.Terminate();
            }
        }

        public string getPolicy(string JsonfilePath)
        {
            string strText = "This";
            using (StreamReader r = new StreamReader("BibleInYear/Bible1.json"))
            {
                string json = r.ReadToEnd();
                dynamic array = JsonConvert.DeserializeObject(json);
                //... read text from json file

            }
            return strText;

        }

I await your response and thank you in advance

7 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vulpes11y ago
Accepted answer
As you're not using the new BiblePolicy class I mentioned in my previous post or your BibleInYear/Bible1.json file, I imagine you're just trying to test it with your existing BibleData class and MyDevotion/Devotion1.json file to see whether it works in principle.

To do that, just change this line:

return d[0];

to (say) this:

return d[0].ReadText;
Vulpes11y ago
If it's a custom MessageBox you're using, perhaps there is a limit on the length of text it can accommodate which is exceeded by the ReadText property?
JOHN JOHNNNY11y ago
Thank you for your reply, but it was only part of the content that was shown in the message box. Do you have any idea why it is so
JOHN JOHNNNY11y ago
Hi Prof

When i ran the build i got this error "Cannot implicitly convert type 'DevotionJson.Devotion' to 'string'"

//This is my class
public class Devotion
    {
        public string Date { get; set; }
        public string Title { get; set; }
        public string Verse { get; set; }

        [JsonProperty("Read Chapter")]
        public string ReadChapter { get; set; }

        [JsonProperty("Read Text")]
        public string ReadText { get; set; }

        [JsonProperty("Bible In One Year")]
        public string BibleInOneYear { get; set; }

        public string Message { get; set; }
        public string Notes { get; set; }

        public override string ToString()
        {
            string[] props = new string[8];
            props[0] = "DATE - " + Date;
            props[1] = "TITLE - " + Title;
            props[2] = "VERSE - " + Verse;
            props[3] = "READ CHAPTER - " + ReadChapter;
            props[4] = "READ TEXT - " + ReadText;
            props[5] = "BIBLE IN ONE YEAR - " + BibleInOneYear;
            props[6] = "MESSAGE - " + Message;
            props[7] = "NOTES - " + Notes;
            return String.Join("\r\n\r\n", props);
        }
    }

//This is my xaml.cs
CustomMessageBox cmb;
        private void openMsgBox(object sender, RoutedEventArgs e)
        {
            // create new Stack panel
            StackPanel sp = new StackPanel() { Orientation = System.Windows.Controls.Orientation.Vertical };

            //get policy text from file
            string devotion = getDevotion("MyDevotion/Devotion1.json");

            //Create new label
            TextBlock tb = new TextBlock()
            {
                Text = devotion,
                TextWrapping = TextWrapping.Wrap,
                FontSize = 25,
            };

            //Create new Scroll viewer
            ScrollViewer sv = new ScrollViewer()
            {
                VerticalScrollBarVisibility = ScrollBarVisibility.Auto,
                Height = 700,
            };

            // add texblock in scroll viewer
            sv.Content = tb;



            //Add the controls to stack panel
            sp.Children.Add(sv);

            cmb = new CustomMessageBox()
            {
                // Set its content
                Content = sp,
                Opacity = 0.9,

                // Left button of message box Button
                LeftButtonContent = "Back",


            };

            //Show the message box...
            cmb.Show();
        }

        public string getDevotion(string JsonfilePath)
        {
            Devotion[] d = null;

            using (StreamReader r = new StreamReader(JsonfilePath))
            {
                string json = r.ReadToEnd();
                d = JsonConvert.DeserializeObject(json);
            }
            return d[0];//**Error here**
        }

Kindly help
Vulpes11y ago
Well, as the code stands, strText is null and so that's why you're not seeing any output.

I imagine you have the policy text in a different JSON file to the one you're using to populate the BibleData class.

Suppose your JSON file contains a single object which looks like this:

{"Policy" : "blah...blah"}

You'll need to create an extra class to deserialize it:

public class BiblePolicy // say
{
public string Policy {get; set;}
}

Incidentally, whilst it does no harm, there's no need to declare these classes as 'partial' since nothing is being written to them by the Visual Studio designer itself.

Your getPolicy method will then need altering as follows:

public string getPolicy(string JsonfilePath)
{
BiblePolicy bp = null;

using (StreamReader r = new StreamReader(JsonfilePath))
{
string json = r.ReadToEnd();
bp = JsonConvert.DeserializeObject(json);
}

return bp.Policy;
}
JOHN JOHNNNY11y ago
Hi Proff Vulpes

When i ran it in the emulator it shows no error but the content of my json file is not appearing when i clicked the message box it shows blank with no content. I have created a class for the json before which is BibleData.cs, view my code below for neccessary correction

//BibleData.cs
public partial class BibleData
    {
        public string Date { get; set; }

        [JsonProperty("Bible Chapter")]
        public string BibleChapter { get; set; }

        [JsonProperty("Bible Content")]
        public string BibleContent { get; set; }

        public override string ToString()
        {
            string[] props = new string[3];
            props[0] = "DATE - " + Date;
            props[1] = "Bible Chapter - " + BibleChapter;
            props[2] = "Bible Content - " + BibleContent;

            return String.Join("\r\n\r\n", props);
        }
    }

//xaml.cs
CustomMessageBox cmb;
        private void openMsgBox(object sender, RoutedEventArgs e)
        {
            // create new Stack panel
            StackPanel sp = new StackPanel() { Orientation = System.Windows.Controls.Orientation.Vertical };

            //get policy text from file
            string policy = getPolicy("BibleInYear/Bible1.json");

            //Create new label
            TextBlock tb = new TextBlock()
            {
                Text =policy,
                TextWrapping = TextWrapping.Wrap,
                FontSize = 25,
            };

            //Create new Scroll viewer
            ScrollViewer sv = new ScrollViewer()
            {
                VerticalScrollBarVisibility=ScrollBarVisibility.Auto,
                Height=500,
            };

            // add texblock in scroll viewer
            sv.Content = tb;





            //Add the controls to stack panel
            sp.Children.Add(sv);


            // Create new Custom Message Box instance
            cmb = new CustomMessageBox()
            {
                // Set its content to our Stack Panel
                Content = sp,

                Opacity = 0.98,

                // Left button of message box Button
                LeftButtonContent = "Accepts",

                //Right button of message Box
                RightButtonContent="Reject",
            };

            //Handle msg box click
            cmb.Dismissing += cmb_Dismissing;
            //Show the message box...
            cmb.Show();
        }



        void cmb_Dismissing(object sender, DismissingEventArgs e)
        {
            if (e.Result==CustomMessageBoxResult.LeftButton)
            {
                MessageBox.Show("Now you can use this app.");
            }
            else
            {
                //do what you want
                MessageBox.Show("It's mandatory to accepts the T&C to use this app. Exiting from app.");
                App.Current.Terminate();
            }
        }

        public string getPolicy(string JsonfilePath)
        {
            string strText = null;
            using (StreamReader r = new StreamReader(JsonfilePath))
            {
                string json = r.ReadToEnd();
                dynamic array = JsonConvert.DeserializeObject(json);
                //... read text from json file

            }
            return strText;

        }

Thank you in advance
Vulpes11y ago
Well, the problem lies with this line:

string policy = getPolicy();

The getPolicy() method is specifically written to throw a NotImplementedException if called:

private string getPolicy()
{
throw new NotImplementedException();
}

However, there's another overload of the getPolicy method which takes a JSON file path at it's argument:

public string getPolicy(string JsonfilePath)
{
string strText = "This";
using (StreamReader r = new StreamReader("BibleInYear/Bible1.json"))
{
string json = r.ReadToEnd();
dynamic array = JsonConvert.DeserializeObject(json);
//... read text from json file

}
return strText;
}

So to avoid the exception you need to call this overload instead with the path to a JSON file from which the policy can be obtained:

string policy = getPolicy(someFilePath);