Develop Reference

Update Single Item in the ObservableCollection without LINQ

I am trying to create a list of the Components running on the network. I am trying to get all the components in the ObservableCollection. ObservableCollection<ClsComponent> Now my question is if one of the component in the collection get changed / modified how would I be able to get it reflected to my ObservableCollection of Component
Is there a way to change the it directly in the collection itself?
What is the fast and efficient way doing it?
I have tried: to change it using the LINQ : Find the Component in the collection and change it?
var CompFound = Components.FirstOrDefault(x=>x.Id == myId);
Components.Remove(CompFound);
Components.Add(UpdatedComp);
I am very sure there should have been more optimized way of doing this. Please suggest.
Edit
I am trying to write the code in the function where I can get the parameters of Source Component and Destination Component. Function looks like this
public void UpdateComponent(ClsComponent SourceComp, ClsComponent DestComp)
{
//do something here
}
After the execution of the function I want to Replace Source Component with Destination Component.

I believe this might work for you. I am sure you might be looking for this
Components.Insert(Components.IndexOf(SourceComp), DestComp);
Components.Remove(SourceComp);

One of the most efficient way would be to use a dictionary. There are implementations of ObservableDictionary which will give you the Observable behavior while allowing a fast key-based access to the object.
Check this stackoverflow question. It includes Microsoft's
It should work like ObservableCollection, except it's also a dictionary. So you can Create ObservableDictionary<Int,ClsComponent>
To replace the value simply call
Components[myId] = destComp

WPF ListView places garbage into a log file

When i try to save my list view lines into a log file using StreamWriter:
sw.WriteLine(listview.Items[0]);
it places to the beginning of the line name of LIstViewItem class, and my log looks like:
System.Windows.Controls.ListViewItem: text text text;
I tried to use:
sw.WriteLine(listView.Items[0].ToString());
and:
sw.WriteLine(listView.Items[0].ToString() as string);
but nothing helpes:(
What am i doing wrong?

The ListView.Items property is an ItemCollection. The items contained are typed as Object. You must cast the item to whatever type you populated the ListView with and then access the appropriate property from there. See: https://msdn.microsoft.com/en-us/library/ms605127(v=vs.110).aspx and https://msdn.microsoft.com/en-us/library/system.windows.controls.itemscontrol.items(v=vs.110).aspx for more information.

By default, the console will use the ToString() method as the output. All of the methods you have tried will be using the ToString() method.
Perhaps you are looking for the Text property.
sw.WriteLine(((ListViewItem)listview.Items[0]).Text);

How to write a Wix Custom Action to Read XML data and set Properties

I have been working on this for days and I just don't get the concept of how Custom Actions work with Wix. Or at least I don't see how to do what I want.
I have several XML files that I want to read a value from and populate a property that gets displayed in a UI Dialog. Then when the install begins update that value in another XML file.
I need to be able to pass the filename including path of the local XML file and the node to search for and the key value pair to extract. I also need to pass what property needs to be updated.
I understand the CustomAction DLL concept. And that the session.CustomActionData["parametername"] syntax for passing in parameters. And the session["property"] = to set a property.
But I can't figure out the syntax of the wsx code to make it all happen. I read different examples doing it different ways?
I searched all the Google links out there an nothing seems to fit what I want to do?

You want this to be an immediate custom action not a deferred custom action so CustomActionData has no relevance to you.
What I would do is write a custom table like such:
Id [PK]
File (Formatted)
XPATH
Property
Here's an example:
mySearch
[SOMEPROPERTY]
/test[#'test'] (something like that, I hate xpath)
MYPROPERTY
You can use things like Property/FileSearch to have MSI's AppSearch resolve the location of a file and assign it to [SOMEPROPERTY]. Then you write a custom action scheduled after AppSearch to fetch this table's data, iterate it and fetch the attribute value (or element innertext) of each row and assign it to MYPROPERTY.
InstallShield gave this to me for free. I don't think WiX has a built in extension to do this. Maybe there is a community extension out there. It would probably take me an hour to write a prototype of this in C#/DTF.

Set Search Property Value to a Variable

I have a control which is a TreeView node that will always be set to the name of the PC you're currently running the tested software on. Therefore I need the Search Property for the control's Name property to be set to `Environment.MachineName like so:
The problem with this is that inside UIMap.Designer.cs I can see the generated code that this makes and it's trying to use Environment.MachineName as a string:
this.SearchProperties[WinTreeItem.PropertyNames.Name] = "Environment.MachineName";
Obviously this approach won't work, and it's not possible to manually edit UIMap.Designer.cs to change this. How can I make this work then?

The general approach is to use the UI Map editor to remove that search item. This should be possible from the window shown in the question. Then, in the test method that needs to do the search, add a statement something like
this.uimap.controlNames.SearchProperties[WinTreeItem.PropertyNames.Name]
= Environment.MachineName;
or
this.uimap.controlNames.SearchProperties.Add(name, Environment.MachineName;
The precise statement depends on the structure of the controls, so where I wrote .controlNames. it may need a series of dot-separated control names.

Default entries on a first time creation for a serialized class

I have a class I am using for serializing various configuration options for an application I am working on. I'm adding a new property to the class that is a List, and I'd like it to fill this list if it does not exist already in a XML file. My first thought was to check if the list contained zero items, however this is not acceptable because there are times I want to have zero items in the list. In essence I want a file that has been serialized with an older version of the same class to be "upgraded" and have defaults automatically inserted for new properties. How can I do this? For a more visual example of what I'm trying to do, see below:
When I deserialize an XML file that contains:
<Item1>wtfe</Item1>
<Item2>wtfe</Item2>
and after I've added a list property it will serialze as:
<Item1>wtfe</Item1>
<Item2>wtfe</Item2>
<Item3/>
I want it to serialize as:
<Item1>wtfe</Item1>
<Item2>wtfe</Item2>
<Item3>
<DefaultSubItem/ Field="wtfe">
<DefaultSubItem/ Field="wtfe">
</Item3>
But allow me to change it to:
<Item1>wtfe</Item1>
<Item2>wtfe</Item2>
<Item3></Item3>

Another option may be to use these attributes:
[OnSerializing()]
http://msdn.microsoft.com/en-us/library/system.runtime.serialization.onserializingattribute.aspx
[OnDeserializing()]
http://msdn.microsoft.com/en-us/library/system.runtime.serialization.ondeserializingattribute.aspx

I think your looking for the SerializationBinder class:
http://msdn.microsoft.com/en-us/library/system.runtime.serialization.serializationbinder%28VS.71%29.aspx