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.NET 相关 Web 开发 SQL Server
友情链接
代码比较简单，但需要有几点要注意的地方：
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Me.ProgressBar1.Value = 0
If OpenFileDialog1.ShowDialog() = Windows.Forms.DialogResult.OK Then
Dim fileName As String = OpenFileDialog1.FileName
Dim client As WebClient = New WebClient()
Dim querystring As System.Collections.Specialized.NameValueCollection = New System.Collections.Specialized.NameValueCollection()
querystring.Add("name", "mengxianhui")
querystring.Add("from", "net_lover")
client.QueryString = querystring
Dim uri As Uri = New Uri("http://www.mengxianhui.com:802/Upload.aspx")
AddHandler client.UploadFileCompleted, AddressOf UploadFileCompletedCallback
AddHandler client.UploadProgressChanged, AddressOf UploadProgressCallback
client.UploadFileAsync(uri, "POST", fileName)
End If
End Sub
Private Sub UploadFileCompletedCallback(sender As Object, e As UploadFileCompletedEventArgs)
MessageBox.Show("上传完毕")
End Sub
Private Sub UploadProgressCallback(sender As Object, e As UploadProgressChangedEventArgs)
Me.ProgressBar1.Maximum = 100
Me.ProgressBar1.Minimum = 0
Me.ProgressBar1.Value = e.ProgressPercentage
End Sub
接收文件的代码
<%@ Page Language="C#" AutoEventWireup="true" %>
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
if (Request.Files != null)
{
if (Request.Files.Count > 0)
{
//作为测试，获取的QueryString参数作为文件名的前缀
String fileName = System.IO.Path.GetFileName(Request.Files[0].FileName);
Request.Files[0].SaveAs(Server.MapPath("~/" + Request.QueryString["name"] + "_" + Request.QueryString["from"] + "_" + fileName));
}
}
}
</script>
对于大文件上传，需要在web.config文件里面设置最大的请求长度
<configuration>
<system.web>
<httpRuntime maxRequestLength="600000" executionTimeout="600" />
</system.web>
</configuration>
如果文件在上传到50%就立即完成了，则说明服务器端可能出现了问题。请检查文件是否真的保存到了服务器。
private void button5_Click(object sender, EventArgs e)
{
progressBar1.Value = 0;
if (this.openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
String fileName = openFileDialog1.FileName;
WebClient client = new WebClient();
Uri uri = new Uri("http://www.mengxianhui.com:802/Upload.aspx");
System.Collections.Specialized.NameValueCollection querystring = new System.Collections.Specialized.NameValueCollection();
querystring.Add("name", "mengxianhui");
querystring.Add("from", "net_lover");
client.QueryString = querystring;
client.UploadProgressChanged += new UploadProgressChangedEventHandler(client_UploadProgressChanged);
client.UploadFileCompleted += new UploadFileCompletedEventHandler(client_UploadFileCompleted);
client.UploadFileAsync(uri, "POST", fileName);
}
}
void client_UploadFileCompleted(object sender, UploadFileCompletedEventArgs e)
{
MessageBox.Show("上传完毕");
}
void client_UploadProgressChanged(object sender, UploadProgressChangedEventArgs e)
{
progressBar1.Maximum = 100;
progressBar1.Minimum = 0;
progressBar1.Value = e.ProgressPercentage;
}
