public static bool PrecacheFile(string filepath, EventHandler <PrecacheProgressUpdateEventArgs> progressUpdateHandler = null)
{
try
{
// if the file is on a hard drive and can fit in the available RAM, populate the disk cache
long ramBytesAvailable = (long)new System.Diagnostics.PerformanceCounter("Memory", "Available Bytes").NextValue();
if (ramBytesAvailable > new FileInfo(filepath).Length&& IsPathOnFixedDrive(filepath))
{
using (var fs = new FileStream(filepath, FileMode.Open, FileSystemRights.ReadData, FileShare.ReadWrite, UInt16.MaxValue, FileOptions.SequentialScan))
{
var buffer = new byte[UInt16.MaxValue];
float totalBytes = (float)fs.Length;
if (progressUpdateHandler != null)
{
var e = new PrecacheProgressUpdateEventArgs {
PercentComplete = 0
};
progressUpdateHandler(filepath, e);
long bytesRead = 0;
do
{
if (bytesRead / totalBytes > e.PercentComplete + 0.01)
{
e.PercentComplete = bytesRead / totalBytes;
progressUpdateHandler(filepath, e);
if (e.Cancel)
{
break;
}
}
bytesRead += fs.Read(buffer, 0, UInt16.MaxValue);
} while (bytesRead < totalBytes);
e.PercentComplete = 1;
progressUpdateHandler(filepath, e);
}
else
{
while (fs.Read(buffer, 0, UInt16.MaxValue) > 0)
{
}
}
}
return(true);
}
}
catch (Exception)
{
// ignore precaching errors; could be due to user privileges and it's an optional step
}
return(false);
}
public static bool PrecacheFile(string filepath, EventHandler<PrecacheProgressUpdateEventArgs> progressUpdateHandler = null)
{
try
{
// if the file is on a hard drive and can fit in the available RAM, populate the disk cache
long ramBytesAvailable = (long)new System.Diagnostics.PerformanceCounter("Memory", "Available Bytes").NextValue();
if (ramBytesAvailable > new FileInfo(filepath).Length && IsPathOnFixedDrive(filepath))
{
using (var fs = new FileStream(filepath, FileMode.Open, FileSystemRights.ReadData, FileShare.ReadWrite, UInt16.MaxValue, FileOptions.SequentialScan))
{
var buffer = new byte[UInt16.MaxValue];
float totalBytes = (float) fs.Length;
if (progressUpdateHandler != null)
{
var e = new PrecacheProgressUpdateEventArgs { PercentComplete = 0 };
progressUpdateHandler(filepath, e);
long bytesRead = 0;
do
{
if (bytesRead / totalBytes > e.PercentComplete + 0.01)
{
e.PercentComplete = bytesRead/totalBytes;
progressUpdateHandler(filepath, e);
if (e.Cancel)
break;
}
bytesRead += fs.Read(buffer, 0, UInt16.MaxValue);
} while (bytesRead < totalBytes);
e.PercentComplete = 1;
progressUpdateHandler(filepath, e);
}
else
while (fs.Read(buffer, 0, UInt16.MaxValue) > 0) { }
}
return true;
}
}
catch (Exception)
{
// ignore precaching errors; could be due to user privileges and it's an optional step
}
return false;
}
