/// <summary>
/// Calculates the disk space required by the feature and its selected children and parent features.
/// </summary>
/// <param name="includeParents">If true, the parent features are included in the cost.</param>
/// <param name="includeChildren">If true, the child features are included in the cost.</param>
/// <param name="installState">Specifies the installation state.</param>
/// <returns>The disk space requirement in bytes.</returns>
/// <remarks><p>
/// Win32 MSI API:
/// <a href="http://msdn.microsoft.com/library/en-us/msi/setup/msigetfeaturecost.asp">MsiGetFeatureCost</a>
/// </p></remarks>
public long GetCost(bool includeParents, bool includeChildren, InstallState installState)
{
const int MSICOSTTREE_CHILDREN = 1;
const int MSICOSTTREE_PARENTS = 2;
int cost;
uint ret = RemotableNativeMethods.MsiGetFeatureCost(
(int)this.session.Handle,
this.name,
(includeParents ? MSICOSTTREE_PARENTS : 0) | (includeChildren ? MSICOSTTREE_CHILDREN : 0),
(int)installState,
out cost);
if (ret != 0)
{
throw InstallerException.ExceptionFromReturnCode(ret);
}
return(cost * 512L);
}