Cannot convert from string to newtonsoft.json.jsonreader

Error: Cannot convert from string to Newtonsoft.Json.JsonReader

When encountering the error message “Cannot convert from string to Newtonsoft.Json.JsonReader”, it means that you are trying to convert a string object to a JsonReader object, but the conversion is not possible or not supported.

To understand this error in detail, let’s consider an example.

// Assume we have a JSON string representation
string jsonString = "{\"name\":\"John\",\"age\":30}";

// Try to convert the string to a JsonReader object
JsonReader jsonReader = (JsonReader)jsonString; // This line will cause the error

In the above example, we have a JSON string in the variable “jsonString”. We are trying to convert this string to a JsonReader object, but the direct conversion is not supported.

To resolve this error, you need to deserialize the JSON string using a JSON serializer, such as Newtonsoft.Json.

Let’s update the example to deserialize the JSON string properly:

// Import the required Newtonsoft.Json namespace
using Newtonsoft.Json;

// Assume we have a JSON string representation
string jsonString = "{\"name\":\"John\",\"age\":30}";

// Deserialize the JSON string to a dynamic object
dynamic jsonObject = JsonConvert.DeserializeObject(jsonString);

// Access the properties of the dynamic object
string name = jsonObject.name;
int age = jsonObject.age;

In the updated code, we use the JsonConvert.DeserializeObject method from the Newtonsoft.Json namespace to properly deserialize the JSON string. This method parses the JSON string and converts it into a dynamic object.

Now we can access the properties of the dynamic object, such as “name” and “age”.

Remember to include the Newtonsoft.Json NuGet package in your project to use the JsonConvert class.