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Spire.PDF是一个专业的PDF组件，能够独立地创建、编写、编辑、操作和阅读PDF文件，支持 .NET、Java、WPF和Silverlight。Spire.PDF的PDF API拥有丰富的功能，如安全设置（包括数字签名）、PDF文本/附件/图片提取、PDF文件合并/拆分、元数据更新、章节和段落优化、图形/图像描绘和插入、表格创建和处理、数据导入等等。

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本文介绍如何使用带有C＃和VB.NET的Spire.PDF从URL下载PDF文档。

C#

using System.IO;
using System.Net;
using Spire.Pdf;

namespace DownloadPdfFromUrl
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a PdfDocument object
            PdfDocument doc = new PdfDocument();

            //Create a WebClient object
            WebClient webClient = new WebClient();

            //Download data from URL and save as memory stream
            using (MemoryStream ms = new MemoryStream(webClient.DownloadData("//www.e-iceblue.com/images/sample.pdf")))
            {
                //Load the stream
                doc.LoadFromStream(ms);
            }

            //Save to PDF file
            doc.SaveToFile("result.pdf", FileFormat.PDF);
        }
    }
}

VB.NET

Imports System.IO
Imports System.Net
Imports Spire.Pdf

Namespace DownloadPdfFromUrl
    Class Program
        Shared  Sub Main(ByVal args() As String)
            'Create a PdfDocument object
            Dim doc As PdfDocument = New PdfDocument()
 
            'Create a WebClient object
            Dim webClient As WebClient = New WebClient()
 
            'Download data from URL and save as memory stream
            Imports(MemoryStream ms = New MemoryStream(webClient.DownloadData("http:'www.e-iceblue.com/images/sample.pdf")))
            {
                'Load the stream
                doc.LoadFromStream(ms)
            }
 
            'Save to PDF file
            doc.SaveToFile("result.pdf", FileFormat.PDF)
        End Sub
    End Class
End Namespace
 

运行项目后结果：