How may I properly display the content of a text file and allow textsearch to the user?

See more:

C#

WPF

ListView

MVVM

Dear community,

this is what I got so far:
I opened a textfile and read it line for line, saving each line into an ObservableCollection<string>.

This is what I need:
A way to show the strings in the ui of my application so that a text search is possible.

This is what I tried so far:

1. option
I used databinding and connected the ObservableCollection to a ListView. Showing the text worked but I had some difficulties with the search.
I had a textbox, entered a text and a button started the search. Finding lines that matched the searched text was no problem but I couldn't update the selected item of the listview. I tried that by setting a Property of the c# code to an int value und the ListView's SelectedIndex Property is bound to it.
I used snoop to be sure that the binding works, and so it does. But no update of the ListView happens.
Another point is: Even if the selection worked, will the Listview scroll to the selected item ?
I don't think so, that is the reason I tried another way (2. option).
I did implement the INotifyPropertyChanged Interface and also tried to set the updatesourcetrigger in xaml.

Here's the code:

private void Search(object param)
{
    int counter = 0;
    foreach(string line in FixdataFile)
    {
        if(-1 < line.IndexOf(SearchText))
        {
            SelectedLine = counter;
            break;
        }
        counter++;
    }
}

public int SelectedLine
{
    get { return _selectedLine; }
    set { _selectedLine = value; Notify("SelectedLine"); }
}

public ObservableCollection<string> FixdataFile
{
    get { return _fixdataFile; }
    set { _fixdataFile = value; }
}

public event PropertyChangedEventHandler PropertyChanged;
private void Notify(string strPropName)
{
    if (PropertyChanged != null)
    {
        PropertyChanged(this, new PropertyChangedEventArgs(strPropName));
    }
}

<ListView Padding="3" ScrollViewer.VerticalScrollBarVisibility="Auto"
          ItemsSource="{Binding FixdataFile}" removed="Gainsboro"
          SelectedIndex="{Binding SelectedLine, Mode=TwoWay,
          UpdateSourceTrigger=PropertyChanged}">
    <ListView.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding}"/>
        </DataTemplate>
    </ListView.ItemTemplate>
</ListView>

2. option
After some research I found the FlowDocument class and their Wrappers. I read some tutorials and also tried some experimenting.
I was able to show the text but I think it was not the actual correct way, because the search function of the FlowDocumentPageViewer did not work.

I tried it like this:

<Border
    <FlowDocumentReader>
        <FlowDocument>
            <Paragraph LineHeight="8" TextIndent="-16">
                <ItemsControl ItemsSource="{Binding FixdataFile, Mode=OneWay}"
                                ItemTemplate="{StaticResource StringCollection}"/>
            </Paragraph>
        </FlowDocument>
    </FlowDocumentReader>
</Border>

<Window.Resources>
    <DataTemplate x:Key="StringCollection">
        <TextBlock Text="{Binding Mode=OneWay}" TextAlignment="Left" FontSize="12"
                     FontFamily="Arial"/>
    </DataTemplate>
</Window.Resources>

Maybe somebody has an idea to improve my code or another way to show text in ui with granting a text search feature.
While searching I found something like a collectionview class, a wrapper to Collections that offers a filter. But filters are not acceptable. I need something like highlighting text matching the searchtext.

I will be thankful for any hint or code snippets.
Have a good one.