How to catch, in my program, missing sys dll?

[Samishii23]

If I get the error:

System.IO.FileNotFoundException: Could not load file or assembly 'System.Xml.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. The system cannot find the file specified.

How would I go about catching that? I have the peice of code that caused the above error in a try / catch block, but it still caused a fatal crash during run time... How do I catch stuff like this??

[tlhintoq]

The more important question is "Why did you allow it to still cause a fatal crash, if you caught it in a try/catch block?"

How to catch, in my program, missing sys dll?

You caught the exception. Why did you not end gracefully instead of trying to continue forward?

[Samishii23]

It had nothing to do with letting the program end gracefully. The program didn't even move to catch block.

Read what I said. The peice of code that error'ed out, despite being within a try / catch block. DID NOT GET CAUGHT. Besides I wasn't antisipating a missing dll oon the users side. Yes I should account for everything, but in this instance, the program didn't give me a chance to account for it.

Again. It ignored the try/catch.

[tlhintoq]

Can we see the code for this, please?

[Samishii23]

public void Load_ClassData(string c, int id)
				{
						if (gd.SelectedClass == c) { return; }
						else { gd.SelectedClass = c; }

						gd.Discription = new List<string>();
						gd.Talent = new List<string>();

						gd.Discription.Clear();
						gd.Talent.Clear();

						// URI = InstallFolder / Version Folder / Using Version / Class Name / .xml
						// Later will be replaced with GetClassVersion()
						string uri = _settings[18] + "/wowv/" + "[3.2.2]" + c + ".xml";
						try  {
								// +---------------------------------------------------------------------
								// + Load up Class XML Data
								// +---------------------------------------------------------------------
								XDocument doc = XDocument.Load(uri);

								gd.TreeBG = doc.Root.Descendants().Where(x => x.Name == "Class").First().Attribute("bg").Value;
								gd.TreeIco = doc.Root.Descendants().Where(x => x.Name == "Class").First().Attribute("treeico").Value;

								var qTalent = from x in doc.Root.Descendants()
														where x.Name == "Talent"
														select x;

								foreach (XElement x in qTalent)
								{
										if (Int32.Parse(x.Attribute("pts").Value) > 0)
										{
												// Data = ID / Points / Title / Icon / Requirement (if has one)
												if (x.LastAttribute.Name == "req") { gd.Talent.Add(x.Attribute("id").Value + "," + x.Attribute("pts").Value + "," + x.Attribute("title").Value + "," + x.Attribute("icon").Value + "," + x.Attribute("req").Value); }
												else { gd.Talent.Add(x.Attribute("id").Value + "," + x.Attribute("pts").Value + "," + x.Attribute("title").Value + "," + x.Attribute("icon").Value); }
												// Data = Replace String / Description paragraph
												if (Int32.Parse(x.Attribute("pts").Value) > 1 && x.Descendants().First().Attribute("replace") != null ) { gd.Discription.Add(x.Descendants().First().Attribute("replace").Value + "]|[" + x.Descendants().First().Value); }
												else { gd.Discription.Add(x.Descendants().First().Value); }
										}
										else
										{
												// If Talent is "Empty", has 0 points, no description
												gd.Talent.Add(x.Attribute("id").Value + "," + x.Attribute("pts").Value);
												gd.Discription.Add("none");
										}
								}

								// +---------------------------------------------------------------------
								// + Initiate The Calc
								// +---------------------------------------------------------------------
								string[] Split_TreeBG = gd.TreeBG.Split(',');
								string[] Split_TreeIco = gd.TreeIco.Split(',');
								string[] tdtmp;

								// Init Tree Backgrounds
								for (int i=0; i < Split_TreeBG.Count(); i++)
								{
										try { TCTreePanel[i].BackgroundImage = new Bitmap(GetImage("BGTree", Split_TreeBG[i])); }
										catch (Exception EX) { TCTreePanel[i].BackgroundImage = null; TCTreePanel[i].BackColor = Color.Black; }
								}

								// Init Tree Icons
								try {
										TCTree1Count.Image = new Bitmap(GetImage("TIcon", Split_TreeIco[0]));
										TCTree2Count.Image = new Bitmap(GetImage("TIcon", Split_TreeIco[1]));
										TCTree3Count.Image = new Bitmap(GetImage("TIcon", Split_TreeIco[2]));
										}
								catch (Exception EX) {  }

								// Init Talent Icons
								for (int i=0; i < TIcon.Count(); i++)
								{
										tdtmp = gd.Talent[i].Split(',');

										if (tdtmp[1] == "0")
										{
												TIcon[i].Visible = false;
												TIcon[i].Enabled = false;
										}
										else
										{
												TIcon[i].Enabled = true;
												TIcon[i].Visible = true;
												TIcon[i].Image = new Bitmap(GetImage("TIcon", tdtmp[3]));
										}
								}
								for (int i = 0; i < 3; i++) { TCTreePanel[i].Visible = true; }
						} catch (Exception EX) { MessageBox.Show("Error happened when loading XML Data from\n \"" +uri+ "\"\n Error Message: " + EX.Message); }
						ResetTalent("All");
				}

It was catching (not my system, a friend's) on the XDocument.Load( ) Line at the start of the method.
Still broke with a missing system dll msg.

[tlhintoq]

And you're saying the application crashed at line 19 when trying to load the document - rather than jumping to the catch at line 87? Do I understand right?

[Samishii23]

Thats what happened. It was a runtime error stated in the 1st post. For some reason the catch didn't. I had the user re-install .Net 3.5 SP1. No more error. But still... It still didn't

Sigh. The thing should regardless shouldn't it? Or maybe it was a 3.0 bug or something... Besides the try/catch, theres not much else in way of error handling methods are there?

[tlhintoq]

I agree it's a weird one. I usually tick the checkbox on the InstallShield creator to require the correct .NET framework be installed before the installer will continue. So I guess I've never run across it.
[IMGNOTHUMB]http://files.me.com/tlhintoq/njzt9m[/IMGNOTHUMB]

[Samishii23]

Hmm. Right now I'm not doing anything installer work until I clean it all up and get it all working the right way. But thanks for the idea. I'll look into it when the time comes.

Is there a Enviroment value I can check the framework installed version?

[tlhintoq]

Logic tells me there is a way to check, since the installer performs just such a check before continuing. But I would have to jump on Google to see *how* it is done. I would guess you could check for a specific file in System32, or a value in registry.