如何向asp.net Web api调用发送XML？

using System;
using System.Net.Http;
using System.Threading.Tasks;
using System.Xml;

public class Program
{
    public static async Task Main(string[] args)
    {
        // 创建XML数据
        XmlDocument xmlDocument = new XmlDocument();
        xmlDocument.LoadXml("<data>Hello, World!</data>");

        // 创建HTTP请求
        HttpClient httpClient = new HttpClient();
        HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, "https://example.com/api/endpoint");

        // 设置请求头
        request.Headers.Add("Accept", "application/xml");
        request.Content = new StringContent(xmlDocument.OuterXml, System.Text.Encoding.UTF8, "application/xml");

        // 发送请求
        HttpResponseMessage response = await httpClient.SendAsync(request);

        // 处理响应
        if (response.IsSuccessStatusCode)
        {
            // 解析响应的XML数据
            XmlDocument responseXml = new XmlDocument();
            responseXml.LoadXml(await response.Content.ReadAsStringAsync());

            // 处理响应数据
            Console.WriteLine(responseXml.OuterXml);
        }
        else
        {
            Console.WriteLine("请求失败：" + response.StatusCode);
        }
    }
}