高手看过来，如何用webrequest提交multipart/form-data类型的表格。（急！急！急！分不够自己说）

[yk2001]

有一个multipart/form-data的form
我用下面的方式构造出的RequestStream是application/x-www-form-urlencoded类型，如何才能构造正确的multipart/form-data类型的RequestStream?

通过拦截socket发现multipart/form-data的提交是通过两次send实现的，一次send头，一次send参数这又如何做到的？webrequest可以自动实现么？

觉得分不够的可以在
http://community.csdn.net/Expert/topic/3562/3562119.xml?temp=.4532587
跟贴，还不够可以开贴

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HttpWebRequest req = (HttpWebRequest)
WebRequest.Create(url);
req.Method = "POST";
req.ContentType = "multipart/form-data";

StringBuilder UrlEncoded = new StringBuilder();
Char[] reserved = {'?', '=', '&'};
byte[] SomeBytes = null;

if (paramList != null)
{
int i=0, j;
while(i<paramList.Length)
{
j=paramList.IndexOfAny(reserved, i);
if (j==-1)
{
UrlEncoded.Append(HttpUtility.UrlEncode(paramList.Substring(i, paramList.Length-i)));
break;
}
UrlEncoded.Append(HttpUtility.UrlEncode(paramList.Substring(i, j-i)));
UrlEncoded.Append(paramList.Substring(j,1));
i = j+1;
}
SomeBytes = Encoding.GetEncoding("gb2312").GetBytes(UrlEncoded.ToString());
req.ContentLength = SomeBytes.Length;
Stream newStream = req.GetRequestStream();
newStream.Write(SomeBytes, 0, SomeBytes.Length);
newStream.Close();
}
else
{
req.ContentLength = 0;
}

构造

[yyh21m]

帮顶,拿分,谢

[jxzhang615]

关注！学习！！

[haoztao]

这方面不是很熟悉，帮你顶！

[cxyPioneer]

关注

[xiaoslong]

帮你顶一下

[yk2001]

谢谢大家，我自己把帖子回了算了。
参数部分大概是这样做的,最后一个是一个文件上传类型的参数，可以输入filename所以单独处理了。这个方法是拦截了IE发出的包后照猫画虎做出来的，用google搜了一下，解决方案差不多。不过现在还没有解决cookie的输入问题，所以没有办法试验，欢迎大家砸砖。
另外打算明天结贴，在本贴帮顶的和在下面这个帖子跟贴的都有分拿，谢谢大家。
http://community.csdn.net/Expert/topic/3562/3562119.xml?temp=.4532587



StringBuilder UrlEncoded = new StringBuilder();
Char[] reserved1 = { '&'};
Char[] reserved2 = { '='};
byte[] SomeBytes = null;

string substr;
string ucode;
bool isName = true;

if (paramList != null)
{
int i=0, j, k;
while(i<paramList.Length)
{
j = paramList.IndexOfAny(reserved2, i); // =
k = paramList.IndexOfAny(reserved1, i); // &

if (-1==k) // 找到了最后一个
{
UrlEncoded.Append("--");
UrlEncoded.Append(boundary);
UrlEncoded.Append("\r\n");
UrlEncoded.Append("Content-Disposition: form-data; name=\"");
UrlEncoded.Append(HttpUtility.UrlEncode(paramList.Substring(i, j-i),Encoding.GetEncoding("gb2312")));
UrlEncoded.Append(paramList.Substring(j,1));
UrlEncoded.Append("\";filename=\"\"\r\n");
UrlEncoded.Append("Content-Type: application/octet-stream");
UrlEncoded.Append("\r\n\r\n\r\n");
UrlEncoded.Append("--");
UrlEncoded.Append(boundary);
UrlEncoded.Append("--");
UrlEncoded.Append("\r\n");

break;
}

UrlEncoded.Append("--");
UrlEncoded.Append(boundary);
UrlEncoded.Append("\r\n");
UrlEncoded.Append("Content-Disposition: form-data; name=\"");
UrlEncoded.Append(HttpUtility.UrlEncode(paramList.Substring(i, j-i-1),Encoding.GetEncoding("gb2312")));
UrlEncoded.Append(paramList.Substring(j,1));
UrlEncoded.Append("\"\r\n\r\n");
i = j+1;
UrlEncoded.Append(HttpUtility.UrlEncode(paramList.Substring(i, k-i),Encoding.GetEncoding("gb2312")));
UrlEncoded.Append("\r\n");
i = k+1;
}
substr = UrlEncoded.ToString();

SomeBytes = Encoding.GetEncoding("gb2312").GetBytes(UrlEncoded.ToString());
req.ContentLength = SomeBytes.Length;
Stream newStream = req.GetRequestStream();
newStream.Write(SomeBytes, 0, SomeBytes.Length);
newStream.Close();

[hawk234]

up

[yk2001]

上面程序有点小问题,看明白的自己改改吧,谢谢支持