The `PostAsJsonAsync` method in the `System.Net.Http.HttpClient` class is used to send an HTTP POST request to the specified URI with the request body serialized as JSON. This method allows you to conveniently send HTTP requests with JSON data to a remote server. It automatically serializes the provided object into JSON and sends it in the request body. This is commonly used in web application development, especially when interacting with RESTful APIs that accept JSON data.
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