C#•2y ago

✅ .NET MAUI System.Reflection.TargetInvocationException

Good evening, I hope you are doing well. I have the following problem, I would like to decrypt a string with Newtonsoft, however, when I try this in the Constructor my app crashes (error) but when I try it in a RelayCommand it works but the CollectionView doesn't update. The Code:

public SelectedOverviewViewModel()
        {
            CharactersList.Add(new CharacterModel
            {
                Name="Hi"
            });

            List<CharacterModel> characters = new List<CharacterModel>();
            characters = JsonConvert.DeserializeObject<List<CharacterModel>>(JSONstring); // Crashes here

            foreach (CharacterModel character in characters)
            {
                CharactersList.Add(character);
            }
        }

        [RelayCommand]
        void Load()
        {
            List<CharacterModel> characters = new List<CharacterModel>();
            characters = JsonConvert.DeserializeObject<List<CharacterModel>>(JSONstring);

            foreach (CharacterModel character in characters)
            {
                CharactersList.Add(character);
            }
        }

public SelectedOverviewViewModel()
        {
            CharactersList.Add(new CharacterModel
            {
                Name="Hi"
            });

            List<CharacterModel> characters = new List<CharacterModel>();
            characters = JsonConvert.DeserializeObject<List<CharacterModel>>(JSONstring); // Crashes here

            foreach (CharacterModel character in characters)
            {
                CharactersList.Add(character);
            }
        }

        [RelayCommand]
        void Load()
        {
            List<CharacterModel> characters = new List<CharacterModel>();
            characters = JsonConvert.DeserializeObject<List<CharacterModel>>(JSONstring);

            foreach (CharacterModel character in characters)
            {
                CharactersList.Add(character);
            }
        }

I´m using: CommunityToolkit.MAUI (latest) CommunityToolkit.MVVM (latest) Newton.Json (latest)

11 Replies

Buddy•2y ago

What error? - I have an issue, I get an error. Is basically what you're saying right now. Please include further information such as what the precise issue is including the error itself.

LaxmanOP•2y ago

System.Reflection.TargetInvocationException when my ViewModel hits the Constructor method in following line:

characters = JsonConvert.DeserializeObject<List<CharacterModel>>(JSONstring);

characters = JsonConvert.DeserializeObject<List<CharacterModel>>(JSONstring);

But when I use the line above in an RelayCommand, there is no error, and the string gets parsed correctly. I'm trying to figure out how to use the deserialize line on Startup.

Buddy•2y ago

And what is the JSON string? as well as the code of CharacterModel You can use this $paste

MODiX•2y ago

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LaxmanOP•2y ago

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LaxmanOP•2y ago

https://paste.mod.gg/onvdfttbamfo/1

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LaxmanOP•2y ago

https://paste.mod.gg/onvdfttbamfo/2

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LaxmanOP•2y ago

Thx for trying to helping me

Buddy•2y ago

Try to use System.Text.Json instead of Newtonsoft, it's also the standard today. and faster

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

LaxmanOP•2y ago

Hey, thx for your help, a made a Work around, thx for the Tipp, thx for all !!!!!

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✅ .NET MAUI System.Reflection.TargetInvocationException