Asp net core serialized object with a fileinfo returns incomplete json


ASP.NET is a popular programming language used for building web applications. It provides a framework for developing dynamic websites, web services, and web applications. One common that developers may encounter is when an ASP.NET Core serialized object with a FileInfo returns incomplete JSON. In this article, we will explore this problem and provide a solution with examples.

The Problem

When serializing an object that includes a FileInfo property in ASP.NET Core, you may notice that the resulting JSON is incomplete. This can be frustrating, especially if you rely on the serialized object for further processing or data exchange.

The Cause

The issue occurs because the FileInfo class in ASP.NET Core includes that are not serializable by default. These properties, such as the Directory property, contain complex data types that cannot be converted to JSON.

The Solution

To solve this problem, we need to the process for the FileInfo class. We can achieve this by a custom converter that handles the serialization of the FileInfo object.

First, let's define the custom converter class:

In the above code, we define a custom converter class FileInfoConverter that inherits from the JsonConverter class provided by the Newtonsoft.Json library. We override the WriteJson method to handle the serialization of the FileInfo object. In this case, we simply write the full name of the file to the JSON .

Next, let's see how we can apply this custom converter to the serialization process:

FileInfo fileInfo = new FileInfo("path/to/file.txt");

JsonSerializerSettings settings = new JsonSerializerSettings();
settings.Converters.Add(new FileInfoConverter());

string json = JsonConvert.SerializeObject(fileInfo, settings);

In the above code, we create an instance of the FileInfo class and the path to the file. We then create an instance of the JsonSerializerSettings class and add our custom converter to the Converters collection. Finally, we use the JsonConvert.SerializeObject method to serialize the FileInfo object to JSON using the specified settings.

By applying the custom converter, the resulting JSON will now include the full name of the file instead of the incomplete serialization. This allows us to work with the serialized object without any missing data.


In this article, we explored the issue of an ASP.NET Core serialized object with a FileInfo incomplete JSON. We identified the cause of the problem and provided a solution by creating a custom converter for the FileInfo class. By applying this custom converter, we can ensure that the serialization process includes all the necessary data in the resulting JSON. This allows us to work with the serialized object effectively and avoid any missing information.

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