前言
这篇文章主要给大家介绍了关于c#导出pdf的实现方法，分享出来供大家参考学习，下面话不多说了，来一起看看详细的介绍吧
方法如下：
一.接口部分的代码
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[httpget]
public httpresponsemessage exportpdf(string id)
{
string pdfname = "";
//id 查询条件，根据实际情况修改即可
//pdfname 例如download.pdf
byte[] pdfdata= _policygapmanagerservice.exportpdf(id, out pdfname);//获得pdf字节
var result = new httpresponsemessage(httpstatuscode.ok)
{
content = new bytearraycontent(pdfdata)
};
result.content.headers.contentdisposition =
new contentdispositionheadervalue("attachment")
{
filename = pdfname
};
result.content.headers.contenttype =new mediatypeheadervalue("application/pdf");
return result;
}
二.返回pdfbyte数组
1.下载http模式的pdf文件（以asp.net为例，将pdf存在项目的目录下，可以通过http直接打开项目下的pdf文件）
#region 调用本地文件使用返回pdfbyte数组
/// <summary>
/// 调用本地文件使用返回pdfbyte数组
/// </summary>
/// <param name="srcpdffile">‘d:\in2434341555551.pdf'</param>
/// <returns></returns>
public static byte[] getsignaturepdfbyte(string srcpdffile)
{
using (filestream fsread = new filestream(srcpdffile, filemode.open, fileaccess.read, fileshare.read))
{
int fslen = (int)fsread.length;
byte[] hebyte = new byte[fslen];
fsread.read(hebyte, 0, hebyte.length);
return hebyte;
}
}
#endregion 调用本地文件使用返回pdfbyte数组
#region 从网站上下载pdf，转化为字节流
/// <summary>
/// 从网站上下载pdf，转化为字节流
/// </summary>
/// <param name="srcpdffile">文件地址：'https://******/group2/m00/00/04/wkj-mlpcoz2iubk5aacrpav6k98aaab6gaaaaaaaku9562.pdf'</param>
/// <returns></returns>
public static byte[] getbytebyremoteurl(string srcpdffile)
{
byte[] arrarybyte;
httpwebrequest req = (httpwebrequest)httpwebrequest.create(srcpdffile);
req.method = "get";
using (webresponse wr = req.getresponse())
{
streamreader responsestream = new streamreader(wr.getresponsestream(), encoding.utf8);
int length = (int)wr.contentlength;
byte[] bs = new byte[length];
httpwebresponse response = wr as httpwebresponse;
stream stream = response.getresponsestream();
//读取到内存
memorystream stmmemory = new memorystream();
byte[] buffer1 = new byte[length];
int i;
//将字节逐个放入到byte 中
while ((i = stream.read(buffer1, 0, buffer1.length)) > 0)
{
stmmemory.write(buffer1, 0, i);
}
arrarybyte = stmmemory.toarray();
stmmemory.close();
}
return arrarybyte;
}
#endregion 从网站上下载pdf，转化为字节流
#region 从网站上下载文件，保存到其他路径
/// <summary>
/// 从网站上下载文件，保存到其他路径
/// </summary>
/// <param name="pdffile">文件地址</param>
/// <param name="saveloadfile">保存文件路径：d:\12221.pdf</param>
/// <returns></returns>
public string saveremotefile( string saveloadfile , string pdffile)
{
//bool flag = false;
var f = saveloadfile + guid.newguid().tostring("d") + ".pdf";
uri downuri = new uri(pdffile);
//建立一个ｗｅｂ请求，返回httpwebrequest对象
httpwebrequest hwr = (httpwebrequest)webrequest.create(downuri);
//流对象使用完后自动关闭
using (stream stream = hwr.getresponse().getresponsestream())
{
//文件流，流信息读到文件流中，读完关闭
using (filestream fs = file.create(f))
{
//建立字节组，并设置它的大小是多少字节
byte[] bytes = new byte[102400];
int n = 1;
while (n > 0)
{
//一次从流中读多少字节，并把值赋给ｎ，当读完后，ｎ为０,并退出循环
n = stream.read(bytes, 0, 10240);
fs.write(bytes, 0, n); //将指定字节的流信息写入文件流中
}
}
}
//return flag;
//return _outpath + saveloadfile;
return f;
}
#endregion 从网站上下载文件，保存到其他路径
2.ftp模式的pdf文件
/// <summary>
/// 下载ftp文件。
/// </summary>
/// <param name="offsetpath">相对路径</param>
/// <param name="filename">文件名称</param>
/// <returns>下载结果，本地文件路径</returns>
public string download(string offsetpath,string filename)
{
try
{
ftpwebrequest ftpweb = (ftpwebrequest)webrequest.create(_ftprootpath + offsetpath + filename);
ftpweb.method = webrequestmethods.ftp.downloadfile;
ftpweb.usebinary = true;
var resp = ftpweb.getresponse();
using (filestream fs = new filestream(_outpath + filename, filemode.create))
{
using (var s = resp.getresponsestream())
{
if (s == null) { return "文件不存在!"; }
int readcout = 0;
byte[] bytes = new byte[1024];
readcout = s.read(bytes, 0, 1024);
while (readcout > 0)
{
fs.write(bytes, 0, readcout);
readcout = s.read(bytes, 0, 1024);
}
}
}
resp.close();
return _outpath + filename;
}
catch (exception e)
{
return e.message;
}
}
/// <summary>
/// 判断文件是否存在
/// </summary>
/// <param name="offsetpath"></param>
/// <param name="filename"></param>
/// <returns></returns>
public bool fileexists(string offsetpath, string filename)
{
try
{
ftpwebrequest ftpweb = (ftpwebrequest)webrequest.create(_ftprootpath + offsetpath + filename);
ftpweb.method = webrequestmethods.ftp.downloadfile;
ftpweb.usebinary = true;
var resp = (ftpwebresponse)ftpweb.getresponse();
resp.close();
return true;
}
catch (exception)
{
return false;
}
}
/// <summary>
/// 获取目录下所有文件
/// </summary>
/// <returns></returns>
public string[] files(string offsetpath)
{
try
{
ftpwebrequest ftpweb = (ftpwebrequest)webrequest.create(_ftprootpath + offsetpath);
ftpweb.method = webrequestmethods.ftp.listdirectory;
stream stream = ftpweb.getresponse().getresponsestream();
if (stream == null)
{
return null;
}
list<string> filelist = new list<string>();
using (streamreader sr = new streamreader(stream))
{
stringbuilder sb = new stringbuilder();
do
{
sb.append(sr.readline());
if (sb.length > 0)
{
filelist.add(sb.tostring());
sb.clear();
}
else
{
break;
}
} while (true);
}
return filelist.toarray();
}
catch (exception)
{
return null;
}
}
总结
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