c# 模拟提交有附件表单(转)

布满荆棘的人生 2021-11-30 01:34 198阅读 0赞

最近项目需要，需要在winform中模拟表单将数据提交至服务器，发现单独提交键值对很容易实现，单独实现上传文件也很容易实现。要是同时提交键值对和文件，比较麻烦。在百度谷歌了大半天没有任何收获。无奈之下，按照 黑月.Net的 的思路去自己写。经过奋斗 终于搞定。  
方法如下：

public WebResponse SubmitData(string fileName, Uri uri, string\[\] keys, string\[\] values)  
\{  
string boundary = "----------" + DateTime.Now.Ticks.ToString("x");  
HttpWebRequest httpWebRequest2 = (HttpWebRequest)WebRequest.Create(uri);  
//httpWebRequest2.Credentials = credentialCache;//  
httpWebRequest2.ContentType = "multipart/form-data; boundary=" + boundary;  
httpWebRequest2.Method = "POST";

// Build up the post message header

StringBuilder sb = new StringBuilder();

if (keys != null)  
\{  
for (int i = 0; i < keys.Length; i++)  
\{  
sb.Append("--");  
sb.Append(boundary);  
sb.Append("\\r\\n");  
sb.Append("Content-Disposition: form-data; name=\\"" + keys\[i\] + "\\"\\r\\n\\r\\n");  
sb.Append(values\[i\]);  
sb.Append("\\r\\n");  
\}  
\}

sb.Append("--");  
sb.Append(boundary);  
sb.Append("\\r\\n");  
sb.Append("Content-Disposition: form-data; name=\\"file\\"; filename=\\"");  
sb.Append(Path.GetFileName(fileName));  
sb.Append("\\"");  
sb.Append("\\r\\n");  
sb.Append("Content-Type: application/octet-stream");  
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(fileName, FileMode.Open, FileAccess.Read);  
long length = postHeaderBytes.Length + fileStream.Length + boundaryBytes.Length;  
httpWebRequest2.ContentLength = length;

Stream requestStream = httpWebRequest2.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);

WebResponse webResponse2 = httpWebRequest2.GetResponse();  
return webResponse2;

转载于:https://www.cnblogs.com/MaxWoods/archive/2009/12/23/1630914.html