C# winform图片上传事例

在C# WinForms应用程序中上传图片，你可以使用OpenFileDialog来让用户选择图片文件，然后使用WebRequest或HttpClient来发送图片到服务器。以下是一个简单的例子：

1. 添加一个按钮到你的WinForms窗体上，用来触发上传操作。

2. 实现按钮的点击事件处理程序来打开文件选择器，选择图片，并上传。

    

   using System;
   using System.Drawing;
   using System.IO;
   using System.Net;
   using System.Windows.Forms;
   
   public partial class MainForm : Form
   {
   public MainForm()
   {
   InitializeComponent();
   }
   
   private void uploadButton_Click(object sender, EventArgs e)
   {
   using (OpenFileDialog openFileDialog = new OpenFileDialog())
   {
   openFileDialog.InitialDirectory = "c:\\";
   openFileDialog.Filter = "图片文件(*.jpg;*.jpeg;*.gif;*.bmp;*.png)|*.jpg;*.jpeg;*.gif;*.bmp;*.png";
   openFileDialog.FilterIndex = 1;
   openFileDialog.RestoreDirectory = true;
   
   if (openFileDialog.ShowDialog() == DialogResult.OK)
   {
   // 获取选中的文件路径
   string filePath = openFileDialog.FileName;
   
   try
   {
   // 将图片转换为字节数组
   Image image = Image.FromFile(filePath);
   using (MemoryStream ms = new MemoryStream())
   {
   image.Save(ms, image.RawFormat);
   byte[] imageBytes = ms.ToArray();
   
   // 使用WebRequest上传图片
   // 这里需要替换为你的服务器URL
   string url = "http://yourserver.com/upload";
   WebRequest request = WebRequest.Create(url);
   request.Method = "POST";
   request.ContentType = "application/octet-stream";
   request.ContentLength = imageBytes.Length;
   
   using (Stream requestStream = request.GetRequestStream())
   {
   requestStream.Write(imageBytes, 0, imageBytes.Length);
   }
   
   using (WebResponse response = request.GetResponse())
   {
   // 处理服务器响应
   }
   }
   }
   catch (Exception ex)
   {
   MessageBox.Show(ex.Message);
   }
   }
   }
   }
   }