Sharepoint web service 下载大文档出错

[isme2013]

朋友们好，我这里遇到了麻烦，希望得到大家的帮助。



我的需求是这样的，开发winform程序，程序中有个功能是下载SharePoint文档库中的文档。所以，毫无疑问，自然要用到SharePoint 的 web service来实现了，即Copy.asmx。



我的代码是这样的：

        public static void CopyfileToLocal(string strSiteUrl,string strFileUrl, string strFilePath)
        {
            using (Copy copyFile = new Copy())
            {
                if (AdminNwc == null)
                {
                    return;
                }
                copyFile.Credentials = AdminNwc;
                copyFile.Url = strSiteUrl.Trim('/') + @"/_vti_bin/Copy.asmx";
               FieldInformation fileInfo = new FieldInformation();

                FieldInformation[] fileInfoArray = { fileInfo };
                byte[] fileContents;
                copyFile.GetItem(strFileUrl, out fileInfoArray, out fileContents);
                
               
            }
        }

（备注：这里关于创建Copy对象都有引用相应的命名空间）



以上代码在执行过程中，小文件都是没有问题的。但遇到了大文件就会抛异常，例如，下载一个180M的文件，里面出错：Exception of type 'System.OutOfMemoryException' was thrown.


请各位园友伸出援助之手。谢谢，不甚感激！

[isme2013]

引用 1 楼 farawayplace613 的回复:

用Web service下载大文件肯定会内存溢出，试试： C# code?12345678910111213141516171819202122232425//// CopyStream is from // http://stackoverflow.com/questions/411592/how-do-i-save-a-stream-to-a-file//publi……

太棒了，问题解决了，谢谢你。。。。 我用blog记录了这个问题： http://www.cnblogs.com/qixing_gan/archive/2013/03/28/2986730.html

[天涯海角]

用Web service下载大文件肯定会内存溢出，试试：

//
// CopyStream is from 
// http://stackoverflow.com/questions/411592/how-do-i-save-a-stream-to-a-file
//
public static void CopyStream(Stream input, Stream output) { 
            byte[] buffer = new byte[8 * 1024]; 
            int len; 
            while ((len = input.Read(buffer, 0, buffer.Length)) > 0) { 
                output.Write(buffer, 0, len); 
            } 
        } 
 
        protected void Page_Load(object sender, EventArgs e)
        {
            string url = "https://myserver.com/test/Shared%20Documents/mypic.jpg";
            WebRequest request = WebRequest.Create(new Uri(url, UriKind.Absolute));
            request.UseDefaultCredentials = true;
            WebResponse response = request.GetResponse();
            Stream fs = response.GetResponseStream() as Stream;
            
            using (FileStream localfs = File.OpenWrite(@"c:\temp\aspdownloadedfile.jpg"))
            {
                CopyStream(fs, localfs);
            }
        }

[isme2013]

引用 1 楼 farawayplace613 的回复:

用Web service下载大文件肯定会内存溢出，试试：

//
// CopyStream is from 
// http://stackoverflow.com/questions/411592/how-do-i-save-a-stream-to-a-file
//
public static void CopyStream(Stream input, Stream output) { 
            byte[] buffer = new byte[8 * 1024]; 
            int len; 
            while ((len = input.Read(buffer, 0, buffer.Length)) > 0) { 
                output.Write(buffer, 0, len); 
            } 
        } 
 
        protected void Page_Load(object sender, EventArgs e)
        {
            string url = "https://myserver.com/test/Shared%20Documents/mypic.jpg";
            WebRequest request = WebRequest.Create(new Uri(url, UriKind.Absolute));
            request.UseDefaultCredentials = true;
            WebResponse response = request.GetResponse();
            Stream fs = response.GetResponseStream() as Stream;
            
            using (FileStream localfs = File.OpenWrite(@"c:\temp\aspdownloadedfile.jpg"))
            {
                CopyStream(fs, localfs);
            }
        }

因为我的是在winform中做的下载文档，所以不知道这种方法是否可行，先谢谢你，我现在去测试。