发布：2022/6/30 23:33:41作者：管理员 来源：本站 浏览次数：1092
1、同步上传
文章 http://www.javashuo.com/article/p-plwlnljc-hb.html 里面有提到服务端经过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：html
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();
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：web
1.Header的Content-Type必须设置为application/form-dataapi
2、异步上传
上面是同步方式上传，下面是异步方式上传 app
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，经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 = 0;
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：异步
1.上传的方法由UploadFile修改成UploadFileAsync，这个方法是异步的，非阻塞。this
2.注册WebClient的两个事件UploadFileCompleted和UploadProgressChanged，用于显示进度。url
3、大文件上传
大文件传输spa
1.服务端web.config须要配置最大的请求：code
<configuration>
<system.web>
<httpRuntime targetFramework="4.5" maxRequestLength="2147483647" />
</system.web>
<system.webServer>
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength="2147483647"/>
</requestFiltering>
</security>
</system.webServer>
</configuration>
2.WebApi代码orm
[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.通常配置为最大2G差很少了，若是比2G还大，建议使用FTP上传吧。
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