4.2Creating a Builder Instance

Because the constructor of HttpMultipartFormDataBuilder is private, it cannot be instantiated directly using the new keyword. To set multipart form content in an HTTP remote request, you must configure it through the SetMultipartContent(Action<HttpMultipartFormDataBuilder>) method provided by the HttpRequestBuilder object.

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HttpRequestBuilder.Post("https://furion.net")    .SetMultipartContent(multipart =>    {        // The type of multipart is HttpMultipartFormDataBuilder    });