今天在做一个下载大尺寸文件的逻辑时,我遇到了一个错误。为了下载我的逻辑是将文件分成10KB块然后集成它并正在下载。下载发生的事情就像每次减少10KB的总大小,但是一旦剩余长度小于10KB我的下载就越来越多了interuppted。请查看我的以下代码,如果我的逻辑中需要进行任何更改,请告诉我。
protected void btnDownload_Click(object sender, EventArgs e)
{
SPSecurity.RunWithElevatedPrivileges(delegate()
{
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 = "C:\\Users\\GZT00000000000001020\\Desktop\\123.zip";
// Identify the file name.
string filename = System.IO.Path.GetFileName(filepath);
try
{
iStream = new System.IO.FileStream(filepath, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read);
dataToRead = iStream.Length;
Page.Response.ContentType = "application/octet-stream";
Page.Response.AddHeader("Content-Disposition", "attachment; filename=" + filename);
// Read the bytes.
while (dataToRead > 0)
{
// Verify that the client is connected.
if (Page.Response.IsClientConnected)
{
if( (dataToRead < 10000) && (dataToRead!=-1))
{
length = (int)dataToRead;
buffer = new Byte[length];
dataToRead = -1;
}
else
{
// Read the data in buffer.
length = iStream.Read(buffer, 0, 10000);
}
// Write the data to the current output stream.
Page.Response.OutputStream.Write(buffer, 0, length);
// Flush the data to the HTML output.
Page.Response.Flush();
if (dataToRead > 10000)
{
buffer = new Byte[10000];
dataToRead = dataToRead - length;
}
else if(dataToRead!=-1)
{
length =(int)dataToRead ;
buffer = new Byte[length];
}
}
else
{
//prevent infinite loop if user disconnects
dataToRead = -1;
}
}
}
catch (Exception ex)
{
// Trap the error, if any.
Page.Response.Write("Error : " + ex.Message);
}
finally
{
if (iStream != null)
{
//Close the file.
iStream.Close();
}
Page.Response.Close();
}
});
}
答案 0 :(得分:0)
您不会在iStream.Read
&lt;分支机构中调用dataToRead
。 10000