SharePoint中的文件下载(.Net文件下载,支持大文件)

今天折腾了一天,就在折腾这个下载.由于SharePoint中的文件都是存在数据库中的,没有实体路径,导致好多种方式的文件下载不能用,只能使用写出文件流的方式来下载,进过百般折腾后找到以下代码,在此作为记录

下面是原始代码:

 System.IO.Stream iStream = null;
 
 // Buffer to read 10K bytes in chunk:
 byte[] buffer = new Byte[10000];
 
 // Length of the file:
 int length;
 
 // Total bytes to read:
 long dataToRead;
 
 // Identify the file to download including its path.
 string filepath = "DownloadFileName";
 
 // Identify the file name.
 string filename = System.IO.Path.GetFileName(filepath);
 
 try {
     // Open the file.
     iStream = new System.IO.FileStream(filepath, System.IO.FileMode.Open,
     System.IO.FileAccess.Read, System.IO.FileShare.Read);
 
 
     // Total bytes to read:
     dataToRead = iStream.Length;
 
     Response.ContentType = "application/octet-stream";
     Response.AddHeader("Content-Disposition", "attachment; filename=" + filename);
 
     // Read the bytes.
     while (dataToRead > 0) {
         // Verify that the client is connected.
         if (Response.IsClientConnected) {
             // Read the data in buffer.
             length = iStream.Read(buffer, 0, 10000);
 
             // Write the data to the current output stream.
             Response.OutputStream.Write(buffer, 0, length);
 
             // Flush the data to the HTML output.
             Response.Flush();
 
             buffer = new Byte[10000];
             dataToRead = dataToRead - length;
         } else {
             //prevent infinite loop if user disconnects
             dataToRead = -1;
         }
     }
 } catch (Exception ex) {
     // Trap the error, if any.
     Response.Write("Error : " + ex.Message);
 } finally {
     if (iStream != null) {
         //Close the file.
         iStream.Close();
     }
 }

以下是修改过的SharePoint代码:

 System.IO.Stream iStream = null;
 
 // Buffer to read 10K bytes in chunk:
 byte[] buffer = new Byte[10000];
 SPFile file = SPContext.Current.Web.GetFile("FileGuid Or FileUrl");
 // Length of the file:
 int length;
 
 // Total bytes to read:
 long dataToRead;
 
 
 
 
 // Identify the file name.
 string filename = file.Name;
 
 try {
     // Open the file.
     iStream = file.OpenBinaryStream();
     
  
 
     // Total bytes to read:
     dataToRead = file.Length;
 
     Response.ContentType = "application/octet-stream";
     Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(file. Name, Syste m.Text.Encoding.UTF8));
 
     // Read the bytes.
     while (dataToRead > 0) {
         // Verify that the client is connected.
         if (Response.IsClientConnected) {
             // Read the data in buffer.
             length = iStream.Read(buffer, 0, 10000);
 
             // Write the data to the current output stream.
             Response.OutputStream.Write(buffer, 0, length);
 
             // Flush the data to the HTML output.
             Response.Flush();
 
             buffer = new Byte[10000];
             dataToRead = dataToRead - length;
         } else {
             //prevent infinite loop if user disconnects
             dataToRead = -1;
         }
     }
 } catch (Exception ex) {
     // Trap the error, if any.
     Response.Write("Error : " + ex.Message);
 } finally {
     if (iStream != null) {
         //Close the file.
         iStream.Close();
     }
 }