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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 + "\"}";
}
以上所述是小编给大家介绍的ASP.NET中利用WebClient上传图片到远程服务的方法，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持！ | 
发表于 2017-1-13 15:43:14
