Geek asks and answers

Update progress bar using value present in inner class

The two code segments below are located in different namespaces. And the second code access modifier is internal. I perform some operations there, and I want to calculate the percentage and update in the MgmntApp progress panel. How can i do this?

Wpfapplication1

MainWindow.xaml

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid Height="204">
        <ProgressBar Height="35" HorizontalAlignment="Left" Margin="57,83,0,0" Name="progressBar1" VerticalAlignment="Top" Width="346" />
    </Grid>
</Window>

I want to update the progress bar value by doing a lengthy operation in the class below.

Various

Fileparser.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Different
{
    /// <summary>
    /// </summary>
    internal class FileParser:ImageFileParser
    {
        ImageFileParser.GenerateCmds()
        {
            percentage=change;    //0 to 100
            //long time operation
        }
    }
}
+3
source share
2 answers

If parsing is time consuming, you can run it in a separate thread.

You can raise an event on FileParser when progress changes and subscribe to this event in MainWindow:

private void StartParsing()
{
    FileParser fp = new FileParser("FileName.txt");
    fp.ProgressChanged += FileParser_ProgressChanged;
    Thread t = new Thread(fp.GenerateCmds);
    t.Start();
}

private void FileParser_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
    // switch to the UI thread if fileparser is running on a different thread
    Dispatcher.BeginInvoke(new Action(
                              () => { progressbar.Value = e.ProgressPercentage; }));
}

, FileParser:

internal class FileParser:ImageFileParser
{
    internal event EventHandler<ProgressChangedEventArgs> ProgressChanged;

    ImageFileParser.GenerateCmds()
    {
        percentage=change;    //0 to 100
        OnProgressChanged(percentage);
        //long time operation
    }

    internal protected void OnProgressChanged(int percentage)
    {
        var p = ProgressChanged;
        if(p != null)
        {
            p(this, new ProgressChangedEventArgs(percentage, null));
        }
    }
}
+2

FileParser?

<ProgressBar Value="{Binding MyFileParser.PercentComplete}" ...

FileParser INotifyPropertyChanged:

internal class FileParser:ImageFileParser, INotifyPropertyChanged
{
    private decimal _pct;
    internal decimal PercentComplete { 
        get { return _pct; }
        set {
            _pct = value;
            PropertyChanged(this, new PropertyChangedEventArgs("PercentComplete"));
        }
    }
    PropertyChanged(this, new PropertyChangedEventArgs(info));

    ImageFileParser.GenerateCmds()
    {
        PercentComplete = change;    //0 to 100
        //long time operation
    }
}

PercentComplete ...

+1

More articles:


All Articles