C# でプログレス バーを作成する

// namespaces for C# windows application (.NET Framework)

using System;
using System.Windows.Forms;

namespace ProgressBarExp {
  public partial class Form1 : Form {
    public Form1() {
      InitializeComponent();
    }

    // create a `progressBar1` progress bar in your C# project design
    private void progressBar1_Click(object sender, EventArgs e) {}

    // create a method that performs some calculations
    // the progress bar will synch with this method and progress accordingly
    private void Caluculate(int i) {
      // perform a task
    }

    // create a `RunOperation` button to perform calculations or take action in your C# project
    // design
    private void RunOperation_Click(object sender, EventArgs e) {
      // set the visibility of progress bar
      progressBar1.Visible = true;

      for (int j = 0; j < 10000001; j++) {
        Caluculate(j);
        if (j == 10000000) {
          MessageBox.Show("Operation Complete!");
          progressBar1.Visible = false;
        }
      }
    }
    private void Form1_Load(object sender, EventArgs e) {
      // for indeterminate progress using .NET framework
      progressBar1.Style = ProgressBarStyle.Marquee;

      progressBar1.Visible = false;
    }
  }
}

private void RunOperation_Click(object sender, EventArgs e) {
  progressBar1.Visible = true;
  progressBar1.Maximum = 10000000;
  progressBar1.Value = 1;

  for (int j = 0; j < 10000001; j++) {
    Caluculate(j);

    if (progressBar1.Value == 10000000) {
      MessageBox.Show("Operation Complete!");
      progressBar1.Visible = false;
      break;
    }

    // it will measure the progress of the task or operations and progress in regards to the
    // completion of a task It only requires if the progress bar style is not set to Marquee
    progressBar1.PerformStep();
  }
}

using System;
using System.Windows;
using System.Threading;
using System.Windows.Forms;
using System.ComponentModel;

namespace ProgressBarExp {
  public partial class Form1 : Form {
    public Form1() {
      InitializeComponent();
    }

    // create a progress bar in your C# project's Form1.cs [Design]
    private void progressBar1_Click(object sender, EventArgs e) {}

    // a button to perform an operation synched with the `progressBar1`
    private void RunOperation_Click(object sender, EventArgs e) {
      BackgroundWorker taskSynch = new BackgroundWorker();
      taskSynch.WorkerReportsProgress = true;
      taskSynch.DoWork += taskSynch_DoWork;
      taskSynch.ProgressChanged += taskSynch_ProgressChanged;
      taskSynch.RunWorkerAsync();
    }

    // Form1 load event
    private void Form1_Load(object sender, EventArgs e) {}

    // create a method that connects `BackgroundWorker` with a task
    void taskSynch_DoWork(object sender, DoWorkEventArgs e) {
      for (int i = 0; i < 100; i++) {
        (sender as BackgroundWorker).ReportProgress(i);
        Thread.Sleep(100);
      }
    }

    // create a method that connects a task with the `progressBar1`
    void taskSynch_ProgressChanged(object sender, ProgressChangedEventArgs e) {
      progressBar1.Value = e.ProgressPercentage;
    }
  }
}

using System;
using System.Threading;
using System.Windows.Forms;
using System.ComponentModel;
using System.Drawing;

namespace ProgressBarExp {
  public partial class Form1 : Form {
    public Form1() {
      InitializeComponent();
    }

    private void RunOperation_Click(object sender, EventArgs e) {
      BackgroundWorker taskSynch = new BackgroundWorker();
      taskSynch.WorkerReportsProgress = true;
      taskSynch.DoWork += taskSynch_DoWork;
      taskSynch.ProgressChanged += taskSynch_ProgressChanged;
      taskSynch.RunWorkerAsync();
    }

    private void Form1_Load(object sender, EventArgs e) {
      // make the percentage label `backcolor` transparent
      label1.BackColor = Color.Transparent;
    }

    void taskSynch_DoWork(object sender, DoWorkEventArgs e) {
      for (int i = 0; i < 101; i++) {
        (sender as BackgroundWorker).ReportProgress(i);
        Thread.Sleep(100);

        // to support multi-threading for label1 and label 2
        if (label1.InvokeRequired) {
          label1.Invoke(new MethodInvoker(delegate {
            // shows the progression, it is syched with the task progression
            label1.Text = "Progress: " + i + "%";
          }));
        }

        if (label2.InvokeRequired) {
          label2.Invoke(new MethodInvoker(delegate {
            if (i < 25) {
              label2.Text = "Starting the task...";
            } else if (i > 25 && i < 50) {
              label2.Text = "Half way through...";
            } else if (i > 50 && i < 99) {
              label2.Text = "The wait will be over soon...";
            } else if (i == 100) {
              label2.Text = "Task is completed successfully!";
            }
          }));
        }
      }
    }

    void taskSynch_ProgressChanged(object sender, ProgressChangedEventArgs e) {
      // it will update the progress bar in real time depends on the progress of a task
      progressBar1.Value = e.ProgressPercentage;
    }
  }
}