/// <summary>
/// Downloads a file from the SharePoint server with the specified relative URL.
/// </summary>
/// <param name="relativeUrl">The relative URL of the file to retrieve from the base of the web application containing it.</param>
/// <param name="downloadPath">The path to the directory that the file should be downloaded to.</param>
/// <returns>True if the file was downloaded, false otherwise.</returns>
public bool DownloadFileByUrl(string relativeUrl, string downloadPath)
{
if (!string.IsNullOrWhiteSpace(relativeUrl) && Directory.Exists(downloadPath))
{
try
{
// Get information about the file from SharePoint.
FileInformation fileInfo = Microsoft.SharePoint.Client.File.OpenBinaryDirect(clientContext, relativeUrl);
// Get a reader for the file's contents.
BinaryReader reader = new BinaryReader(fileInfo.Stream);
// Get the segments of the relative path supplied.
string[] pathParts = relativeUrl.Split('/');
// Create a new file and get a stream of it for writing.
FileStream fileStream = GalFile.Create(downloadPath + pathParts[pathParts.Length - 1]);
// Get a writer from the file stream created above.
BinaryWriter writer = new BinaryWriter(fileStream);
// Create a buffer for reading / writing data that is the default size of NTFS file clusters.
byte[] buffer = new byte[NTFS_FILE_CLUSTER_SIZE_IN_BYTES];
// Tracks the number of bytes read from the current read.
int numBytesRead = reader.Read(buffer, 0, buffer.Length);
// Keep reading while there are bytes left in the file to read.
while (numBytesRead > 0)
{
// Write to the new file.
writer.Write(buffer, 0, numBytesRead);
// Read more bytes.
numBytesRead = reader.Read(buffer, 0, buffer.Length);
}
// The file was successfully downloaded.
return(true);
}
catch
{
// There was an error downloading the file.
return(false);
}
}
else
{
return(false);
}
}
