CODEWITHSUNDEEP
c#windows-update
user3342256
user3342256

Reputation: 1290

Comparing Collection Items to List Items to Find Matches

My goal is to take any pending Windows updates that are not explicitly called out in an exception list and dump them into a secondary UpdateCollection of updates that should be installed. My pseudo code looks like this:

String list containing KB numbers for updates that shouldn't be installed:

List<string> windowsUpdateExceptionKBList
KB1234567
KB2644615
KB483729

WUApiLib.UpdateCollection containing update objects

UpdateCollection securityUpdatesList
Iupdate object1
Iupdate object2

Each update object has a ".Title" property containing the KB number (e.g. Security Update for Windows 7 for x64-based Systems (KB2644615)). I need something like the following:

UpdateCollection securityUpdatestoInstall = new UpdateCollection();

foreach (Iupdate update in securityUpdatesList)
 {  
 foreach (string kB in windowsUpdateExceptionKBList)
    { 
        if (!update.Title **contains** kB)
           {
              securityUpdatestoInstall.Add(update);
           }
    }
 }

The above won't work as proposed because it will add duplicate updates to the list due to the nested foreach loops. But I'm having a hard time even conceptualizing how I can accomplish this in C#.

Upvotes: 0

Views: 101

Answers (1)

Ergwun
Ergwun

Reputation: 12978

You need to take action if no match was found, so add a variable to track whether a match was found, and break out of the inner foreach on the first match, then conditionally add the update depending if a match was found: 

UpdateCollection securityUpdatestoInstall = new UpdateCollection();

foreach (Iupdate update in securityUpdatesList)
{
    bool blacklisted = false;
    foreach (string kB in windowsUpdateExceptionKBList)
    { 
        if (update.Title.Contains(kB))
           {
              blacklisted = true;
              break;
           }
    }
    if (!blacklisted)
    {
         securityUpdatestoInstall.Add(update);
    }
 }

Also note that you can use string.Contains, so I've added that too (and notice that it's case sensitive).

Upvotes: 1

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