Error CS1503: cannot convert from 'system.componentmodel.int32converter' to 'system.text.json.serialization.jsonconverter'

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1.00/5 (1 vote)

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In my project, there is such a piece of code, as shown below:

var serializeOperations = new JsonSerializerOptions();
serializeOperations.Converters.Add(new Int32Converter());  // Get error
Root lrsSeg = JsonSerializer.Deserialize<Root>(result, serializeOperations);

But I get

Error CS1503: cannot convert from 'System.ComponentModel.Int32Converter' to 'System.Text.Json.Serialization.JsonConverter'

How to resolve this problem? Thanks if you can help.
----------
After I posted this thread, I retried the code from https://stackoverflow.com/questions/59097784/system-text-json-deserialize-json-with-automatic-casting[^] , the

AutoNumberToStringConverter

, but still get failure

"The JSON value could not be converted to System.Int32.

What I have tried:

Error CS1503: cannot convert from 'System.ComponentModel.Int32Converter' to 'System.Text.Json.Serialization.JsonConverter'

Posted 12-May-23 15:14pm

s yu

Updated 15-May-23 4:06am

v2

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Graeme_Grant 12-May-23 22:09pm

and what does the json look like?

1 solution

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Dave Kreskowiak · Accepted Answer · 2023-05-12T18:08:00

Solution 1

Well, that's because the Int32Converter class is not for Json. You have to use a class that derives from JsonConverter<t>. The Int32Converter class does not do that. I mean, look at the namespace the class sits in: System.ComponentModel. Does that sound like it has anything to do with Json?

You didn't say why you're trying to do this, so about the best I can suggest is reading up on How to write custom converters for JSON serialization - .NET | Microsoft Learn[^]

Posted 12-May-23 18:08pm

Dave Kreskowiak

Comments

s yu 15-May-23 7:57am

Dave: Thanks for your response. The piece of code I used is sourced from
https://www.thecodebuzz.com/system-text-json-the-json-value-could-not-be-converted-to-system-int32/
Solution 1, which is a custom conversion.

s yu 15-May-23 10:51am

I re-checked the classes built through VS tool "Paste Special", and found one field in a class is incorrect. After correcting it. The error is gone. Thank Dave's solution also.