Xamarin.forms上传图片到服务器目录

using System;
using System.Net.Http;
using System.Threading.Tasks;
using Xamarin.Forms;

public class ImageUploader
{
    public async Task UploadImage(string imagePath, string serverUrl)
    {
        try
        {
            HttpClient client = new HttpClient();
            MultipartFormDataContent content = new MultipartFormDataContent();

            // 读取图片文件
            byte[] imageData = await ReadImageFile(imagePath);

            // 创建一个ByteArrayContent对象，将图片数据添加到MultipartFormDataContent对象中
            ByteArrayContent imageContent = new ByteArrayContent(imageData);
            content.Add(imageContent, "image", "image.jpg");

            // 发送HTTP POST请求
            HttpResponseMessage response = await client.PostAsync(serverUrl, content);

            // 检查响应状态码
            if (response.IsSuccessStatusCode)
            {
                // 图片上传成功
                Console.WriteLine("Image uploaded successfully.");
            }
            else
            {
                // 图片上传失败
                Console.WriteLine("Image upload failed. Error: " + response.StatusCode);
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine("Image upload failed. Exception: " + ex.Message);
        }
    }

    private async Task<byte[]> ReadImageFile(string imagePath)
    {
        // 读取图片文件的二进制数据
        byte[] imageData = await DependencyService.Get<IImageService>().ReadImageFile(imagePath);
        return imageData;
    }
}