这篇文章主要介绍了asp.net中利用webclient上传图片到远程服务的方法，包括客户端和服务端，代码附有注释，需要的的朋友参考下吧
一、客户端
1.页面
<form id="form1" method="post" runat="server" enctype="multipart/form-data">
<input id="myfile" type="file" runat="server" />
<br />
<br />
<asp:button id="button1" runat="server" text="上载文件" onclick="button1_click"></asp:button>
</form>
2.后台
system.web.httpfilecollection ofiles = system.web.httpcontext.current.request.files;
string filepath = ofiles[0].filename;
string filename = filepath.substring(filepath.lastindexof("\\") + 1);
byte[] b = new byte[ofiles[0].contentlength];
system.io.stream fs = (system.io.stream)ofiles[0].inputstream;
fs.read(b, 0, ofiles[0].contentlength);
string postdata = "data=" + httputility.urlencode(convert.tobase64string(b));
var webclient = new webclient();
webclient.headers.add("content-type", "application/x-www-form-urlencoded");
byte[] bytearray = encoding.utf8.getbytes(postdata);
//byte[] buffer = webclient.uploaddata("http://localhost/datapush/datapush.ashx", "post", bytearray);//ashx
byte[] buffer = webclient.uploaddata("http://localhost/datapush/webservicedatapush.asmx/datapush", "post", bytearray);//asmx
var msg = encoding.utf8.getstring(buffer);
response.write(msg);
二、服务端
string msg = "";
byte[] filedata = convert.frombase64string(context.request["data"]);
if (filedata.length == 0)
{
msg= "{\"code\":\"上传的是空文件\"}";
}
if (filedata.length > 1048576)
{
msg = "{\"code\":\"图片大小不能超过1m\"}";
}
string fileextension = filedata[0].tostring() + filedata[1].tostring();
if (fileextension == "7173")
{
fileextension = "gif";
}
else if (fileextension == "255216")
{
fileextension = "jpg";
}
else if (fileextension == "13780")
{
fileextension = "png";
}
else if (fileextension == "6677")
{
fileextension = "bmp";
}
else if (fileextension == "7373")
{
fileextension = "tif";
}
else
{
msg = "{\"code\":\"上传的文件不是图片\"}";
}
try
{
//保存图片
string filename = guid.newguid().tostring("d") + "." + fileextension;
system.io.memorystream ms = new system.io.memorystream(filedata);
system.io.filestream fs = new system.io.filestream(context.server.mappath("~/") + "/采集图片/" + filename, system.io.filemode.create);
ms.writeto(fs);
ms.close();
fs.close();
fs = null;
ms = null;
msg = "{\"code\":\"上传图片成功\"}";
}
catch (exception exe)
{
msg = "{\"code\":\"" + exe.message + "\"}";
}
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以上就是webclient上传图片到远程服务的代码示例的详细内容。