Marshalling C# com items when using recursion
- by Kevin
I am using the SourceSafe COM object (SourceSafeTypeLib) from C# to automate a SourceSafe recursive get (part of a larger build process). The recursive function is shown below. How do I ensure that all the COM objects created in the foreach loop get released correctly?
/// <summary>
/// Recursively gets files/projects from SourceSafe (this is a recursive function).
/// </summary>
/// <param name="vssItem">The VSSItem to get</param>
private void GetChangedFiles(VSSItem vssItem)
{
// 'If the object is a file perform the diff,
// 'If not, it is a project, so use recursion to go through it
if(vssItem.Type == (int)VSSItemType.VSSITEM_FILE)
{
bool bDifferent = false; //file is different
bool bNew = false; //file is new
//Surround the diff in a try-catch block. If a file is new(doesn't exist on
//the local filesystem) an error will be thrown. Catch this error and record it
//as a new file.
try
{
bDifferent = vssItem.get_IsDifferent(vssItem.LocalSpec);
}
catch
{
//File doesn't exist
bDifferent = true;
bNew = true;
}
//If the File is different(or new), get it and log the message
if(bDifferent)
{
if(bNew)
{
clsLog.WriteLine("Getting " + vssItem.Spec);
}
else
{
clsLog.WriteLine("Replacing " + vssItem.Spec);
}
string strGetPath = vssItem.LocalSpec;
vssItem.Get(ref strGetPath, (int)VSSFlags.VSSFLAG_REPREPLACE);
}
}
else //Item is a project, recurse through its sub items
{
foreach(VSSItem fileItem in vssItem.get_Items(false))
{
GetChangedFiles(fileItem);
}
}
}
