public override void SetLength(long value)
{
container.PreCheck();
// don't worry about quota if we can't write to the stream,
// the base class will throw the expected NotSupportedException
if (!base.CanWrite)
{
return;
}
// will that request put us in a position to grow *or shrink* the file ?
// note: this can be negative, e.g. calling SetLength(0), so we can't call EnsureQuotaLimits directly
if (!IsolatedStorage.CanExtend(value - Length))
{
throw new IsolatedStorageException("Requested size is larger than remaining quota allowance.");
}
base.SetLength(value);
}
private void EnsureQuotaLimits(long request)
{
// don't worry about quota if we can't write to the stream,
// the base class will throw the expected NotSupportedException
if (!base.CanWrite)
{
return;
}
// will that request put us in a position to grow the file ?
long grow = Position + request - Length;
if (grow < 0)
{
return;
}
if (!IsolatedStorage.CanExtend(grow))
{
throw new IsolatedStorageException("Requested size is larger than remaining quota allowance.");
}
}