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小编给大家分享一下C#如何导出pdf，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！
方法如下：
一.接口部分的代码
[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;
}
}以上是“C#如何导出pdf”这篇文章的所有内容，感谢各位的阅读！相信大家都有了一定的了解，希望分享的内容对大家有所帮助，如果还想学习更多知识，欢迎关注亿速云行业资讯频道！
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