C# 以编程方式将文件从客户端上载到服务器
我正在使用一个简单的应用程序开发fileupload控件,它可以自动将文件传输到服务器 我使用这些示例作为参考,但测试时不会在服务器上创建文件 表格编号:C# 以编程方式将文件从客户端上载到服务器,c#,httpwebrequest,webbrowser-control,C#,Httpwebrequest,Webbrowser Control,我正在使用一个简单的应用程序开发fileupload控件,它可以自动将文件传输到服务器 我使用这些示例作为参考,但测试时不会在服务器上创建文件 表格编号: // simulate this form //<form action ="http://localhost/test.php" method = POST> //<input type = text name = uname> //<input type =
// simulate this form
//<form action ="http://localhost/test.php" method = POST>
//<input type = text name = uname>
//<input type = password name =passwd>
//<input type = FILE name = uploadfile>
//<input type=submit>
//模拟此表单
//
//
//
//
//
我发现这个类使用HttpWebRequest将文件发布到服务器:
public static string UploadFileEx( string uploadfile, string url,
string fileFormName, string contenttype,NameValueCollection querystring,
CookieContainer cookies)
{
if( (fileFormName== null) ||
(fileFormName.Length ==0))
{
fileFormName = "file";
}
if( (contenttype== null) ||
(contenttype.Length ==0))
{
contenttype = "application/octet-stream";
}
string postdata;
postdata = "?";
if (querystring!=null)
{
foreach(string key in querystring.Keys)
{
postdata+= key +"=" + querystring.Get(key)+"&";
}
}
Uri uri = new Uri(url+postdata);
string boundary = "----------" + DateTime.Now.Ticks.ToString("x");
HttpWebRequest webrequest = (HttpWebRequest)WebRequest.Create(uri);
webrequest.CookieContainer = cookies;
webrequest.ContentType = "multipart/form-data; boundary=" + boundary;
webrequest.Method = "POST";
// Build up the post message header
StringBuilder sb = new StringBuilder();
sb.Append("--");
sb.Append(boundary);
sb.Append("\r\n");
sb.Append("Content-Disposition: form-data; name=\"");
sb.Append(fileFormName);
sb.Append("\"; filename=\"");
sb.Append(Path.GetFileName(uploadfile));
sb.Append("\"");
sb.Append("\r\n");
sb.Append("Content-Type: ");
sb.Append(contenttype);
sb.Append("\r\n");
sb.Append("\r\n");
string postHeader = sb.ToString();
byte[] postHeaderBytes = Encoding.UTF8.GetBytes(postHeader);
// Build the trailing boundary string as a byte array
// ensuring the boundary appears on a line by itself
byte[] boundaryBytes = Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");
FileStream fileStream = new FileStream(uploadfile, FileMode.Open, FileAccess.Read);
long length = postHeaderBytes.Length + fileStream.Length + boundaryBytes.Length;
webrequest.ContentLength = length;
Stream requestStream = webrequest.GetRequestStream();
// Write out our post header
requestStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);
// Write out the file contents
byte[] buffer = new Byte[checked((uint)Math.Min(4096, (int)fileStream.Length))];
int bytesRead = 0;
while ( (bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0 )
requestStream.Write(buffer, 0, bytesRead);
// Write out the trailing boundary
requestStream.Write(boundaryBytes, 0, boundaryBytes.Length);
requestStream.Flush();
requestStream.Close();
WebResponse responce = webrequest.GetResponse();
Stream s = responce.GetResponseStream();
StreamReader sr = new StreamReader(s);
return sr.ReadToEnd();
}
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main(string[] args)
{
CookieContainer cookies = new CookieContainer();
//add or use cookies
NameValueCollection querystring = new NameValueCollection();
querystring["uname"]="";
querystring["passwd"]="";
string uploadfile;// set to file to upload
uploadfile = "C:\\test.jpg";
UploadFileEx(uploadfile, "http://127.0.0.1/app/Default.aspx", "uploadfile", "image/pjpeg",
querystring, cookies);
}
publicstaticstringuploadfileex(stringuploadfile,stringurl,
字符串fileFormName、字符串contenttype、NameValueCollection querystring、,
CookieContainer饼干)
{
if((fileFormName==null)||
(fileFormName.Length==0))
{
fileFormName=“file”;
}
if((contenttype==null)||
(contenttype.Length==0))
{
contenttype=“应用程序/八位字节流”;
}
字符串postdata;
postdata=“?”;
if(querystring!=null)
{
foreach(querystring.Keys中的字符串键)
{
postdata+=key+“=”+querystring.Get(key)+“&”;
}
}
Uri=新Uri(url+postdata);
字符串边界=“------------”+DateTime.Now.Ticks.ToString(“x”);
HttpWebRequest webrequest=(HttpWebRequest)webrequest.Create(uri);
webrequest.CookieContainer=cookies;
webrequest.ContentType=“多部分/表单数据;边界=“+boundary;
webrequest.Method=“POST”;
//建立post消息头
StringBuilder sb=新的StringBuilder();
某人加上(“—”);
某人附加(边界);
sb.追加(“\r\n”);
sb.Append(“内容配置:表单数据;名称=\”);
sb.Append(fileFormName);
sb.Append(“\”文件名=\”);
sb.Append(Path.GetFileName(uploadfile));
某人加上“\”;
sb.追加(“\r\n”);
sb.Append(“内容类型:”);
sb.Append(contenttype);
sb.追加(“\r\n”);
sb.追加(“\r\n”);
字符串postHeader=sb.ToString();
字节[]postHeaderBytes=编码.UTF8.GetBytes(postHeader);
//将尾部边界字符串构建为字节数组
//确保边界本身显示在一条线上
byte[]boundaryBytes=Encoding.ASCII.GetBytes(“\r\n--”+boundary+”\r\n”);
FileStream FileStream=newfilestream(上传文件,FileMode.Open,FileAccess.Read);
long length=postHeaderBytes.length+fileStream.length+boundaryBytes.length;
webrequest.ContentLength=长度;
Stream requestStream=webrequest.GetRequestStream();
//写出我们的文章标题
写入(postHeaderBytes,0,postHeaderBytes.Length);
//写出文件内容
byte[]buffer=new byte[checked((uint)Math.Min(4096,(int)fileStream.Length));
int字节读取=0;
而((bytesRead=fileStream.Read(buffer,0,buffer.Length))!=0)
写入(缓冲区,0,字节读取);
//写出尾随边界
Write(boundaryBytes,0,boundaryBytes.Length);
requestStream.Flush();
requestStream.Close();
WebResponse response=webrequest.GetResponse();
流s=response.GetResponseStream();
StreamReader sr=新的StreamReader;
返回sr.ReadToEnd();
}
///
///应用程序的主要入口点。
///
[状态线程]
静态void Main(字符串[]参数)
{
CookieContainer cookies=新CookieContainer();
//添加或使用cookies
NameValueCollection querystring=新的NameValueCollection();
查询字符串[“uname”]=“”;
查询字符串[“passwd”]=“”;
string uploadfile;//设置为要上载的文件
uploadfile=“C:\\test.jpg”;
UploadFileEx(uploadfile,“http://127.0.0.1/app/Default.aspx“,”上传文件“,”图像/pjpeg“,
查询、饼干);
}
在我的例子中,我想通过WebBrowser控件使用这个类,但是当我向服务器发送post时,文件(test.jpg)没有创建
这可能是文件夹的权限问题!但是当使用IIS进行本地测试时,我会遇到同样的问题吗
谢谢你的问题有点难理解,如果这不是正确的答案,很抱歉,但是如果你想使用标准POST的WebRequest上传文件,那么它是这样的:提供一些代码,这也是一般性的问题。你能发布你正在使用的代码吗?你有什么特别的错误吗?您没有给我们提供任何有用的信息,我们无法使用这些信息来帮助您。请按照此链接中的描述进行操作:UploadFileEx是一个自定义类。如果您需要帮助,您必须提供所有代码。我已经看过这些代码,但是如何在请求中设置表单字段。