发布:2022/6/17 8:40:04作者:管理员 来源:本站 浏览次数:1416
文章 https://www.cnblogs.com/duanjt/p/6420172.html 里面有提到服务端通过WebApi如何实现文件上传,这里就只说客户端使用WebClient上传,直接上代码:
{ try { string url = "http://localhost:29817/api/values/SaveFile"; if (string.IsNullOrEmpty(this.textBox1.Text)) { MessageBox.Show("请先选择要上传的文件"); return; } string fileName = this.textBox1.Text;//文件全路径(e:\abc.txt) string safeFileName = Path.GetFileName(fileName);//文件名(abc.txt) WebClient client = new WebClient(); client.Credentials = CredentialCache.DefaultCredentials; client.Headers.Add("Content-Type", "application/form-data");//注意头部必须是form-data client.QueryString["fname"] = safeFileName; byte[] fileb = client.UploadFile(new Uri(url), "POST", fileName); string res = Encoding.UTF8.GetString(fileb); MessageBox.Show(res); } catch (Exception ex) { MessageBox.Show(ex.Message); } }
注意:
1.Header的Content-Type必须设置为application/form-data
上面是同步方式上传,下面是异步方式上传
private void button2_Click(object sender, EventArgs e) { try { string url = "http://localhost:29817/api/values/SaveFile"; if (string.IsNullOrEmpty(this.textBox1.Text)) { MessageBox.Show("请先选择要上传的文件"); return; } string fileName = this.textBox1.Text;//文件全路径(e:\abc.txt) string safeFileName = Path.GetFileName(fileName);//文件名(abc.txt) WebClient client = new WebClient(); //定义事件,上传成功事件和上传进度事件 client.UploadFileCompleted += client_UploadFileCompleted; client.UploadProgressChanged += client_UploadProgressChanged; client.Credentials = CredentialCache.DefaultCredentials; client.Headers.Add("Content-Type", "application/form-data");//注意头部必须是form-data client.QueryString["fname"] = safeFileName; //异步上传,通过事件回调获取运行状态 client.UploadFileAsync(new Uri(url), "POST", fileName); } catch (Exception ex) { MessageBox.Show("错误:"+ex.Message); } } //上传进度事件,修改进度条 void client_UploadProgressChanged(object sender, UploadProgressChangedEventArgs e) { progressBar1.Minimum = ; progressBar1.Maximum = (int)e.TotalBytesToSend; progressBar1.Value = (int)e.BytesSent; progressBar1.Text = e.ProgressPercentage.ToString(); } //上传完成事件,判断是否上传成功 void client_UploadFileCompleted(object sender, UploadFileCompletedEventArgs e) { if (e.Error == null) { progressBar1.Value = progressBar1.Maximum; this.label2.Text = "上传成功."; } else { MessageBox.Show("上传错误:" + e.Error.Message); this.label2.Text = "上传失败."; } }
说明:
1.上传的方法由UploadFile修改为UploadFileAsync,这个方法是异步的,非阻塞。
2.注册WebClient的两个事件UploadFileCompleted和UploadProgressChanged,用于显示进度。
大文件传输
1.服务端web.config需要配置最大的请求:
<configuration> <system.web> <httpRuntime targetFramework="4.5" maxRequestLength="" /> </system.web> <system.webServer> <security> <requestFiltering> <requestLimits maxAllowedContentLength=""/> </requestFiltering> </security> </system.webServer> </configuration>
2.WebApi代码
[HttpPost] public String SaveFile() { var request = HttpContext.Current.Request; if (request.Files.Count > 0) { HttpPostedFile file= request.Files.Get(0); file.SaveAs(Path.Combine("E:", file.FileName)); } return "1"; }
备注:
1.一般配置为最大2G差不多了,如果比2G还大,建议使用FTP上传吧。
© Copyright 2014 - 2024 柏港建站平台 ejk5.com. 渝ICP备16000791号-4