Why Does My JSON Deserialization Fail with 'Cannot deserialize the current JSON object...'?

JSON deserialization failed: Unable to parse JSON object into a list of objects

When trying to deserialize a JSON string into a custom list of objects, you may encounter the error: "Cannot deserialize the current JSON object (eg: {"name":"value"}) to type 'System.Collections.Generic' .List1'，因为该类型需要一个JSON数组（例如：[1,2,3]`) to be deserialized correctly".

This error is caused by the JSON structure not matching the expected format. JSON arrays are used to represent lists or collections, while JSON objects are used to represent key-value pairs. In this example, the JSON string contains a single object whose "data" property is an array of objects. To solve this problem you need to deserialize the JSON string into a proper class structure.

Understand JSON structure

The JSON string structure provided is as follows:

<code class="language-json">{"data":[{"target_id":9503123,"target_type":"user"}]}</code>

It contains a single object whose "data" property is an array of objects.

Correct deserialization code

The line of code causing the error is:

<code class="language-csharp">List<rootobject> datalist = JsonConvert.DeserializeObject<list>(jsonstring);</code>

This line attempts to deserialize a JSON string into a list of RootObject objects. However, the JSON string contains a single object, not a list of objects. To fix this error, change the code to:

<code class="language-csharp">RootObject datalist = JsonConvert.DeserializeObject<rootobject>(jsonstring);</code>

This corrected code deserializes the JSON string into a single RootObject object, which correctly matches the JSON structure.

Conclusion

You can resolve the "Unable to deserialize the current JSON object" error by ensuring that the code correctly matches the JSON structure. Understanding the expected format of a JSON string is crucial for successful deserialization.

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