用线程实现进度条平缓增加和展示进度详细信息

实现效果如下图：

功能：实现查找文件名包含输入关键字的文件

实现代码：

导入命名空间：

using System.Threading;
using System.Diagnostics;

引用dll System.Windows.Forms

1.选择要查找的文件夹路径：代码如下

 /// <summary>
 /// 选择路径事件
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 private void button1_Click(object sender, RoutedEventArgs e)
 {
            System.Windows.Forms.FolderBrowserDialog fbd = new System.Windows.Forms.FolderBrowserDialog();
            if (fbd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                this.txtPath.Text = fbd.SelectedPath;
            }
   }

2.输入关键字，点击查找

 Thread t;
 string folderPath = string.Empty;
 string strKeyWord = string.Empty;
 /// <summary>
 /// 查找文件名包含输入文字的文件
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 private void button2_Click(object sender, RoutedEventArgs e)
  {
            this.txtProcess.Text = string.Empty;
            this.progressBar1.Value = 0;
            //检查路径是否正确
            if (CheckInput() == false)
            {
                return;
            }
            folderPath = this.txtPath.Text;
            strKeyWord = this.txtName.Text.Trim();
            t = new Thread(Method);
            t.Start();
  }

 3.以上事件用到的方法

  /// <summary>
        /// 检查路径的正确性
        /// </summary>
        /// <returns></returns>
        private bool CheckInput()
        {
            if (this.txtPath.Text.Trim() == string.Empty)
            {
                MessageBox.Show("请输入文件夹路径。", "提示", MessageBoxButton.OK, MessageBoxImage.Information);
                this.txtPath.Focus();
                return false;
            }

            string strFolderName = this.txtPath.Text.Trim();
            try
            {
                string[] fileInfo = Directory.GetFiles(strFolderName);
                if (fileInfo.Length <= 0)
                {
                    MessageBox.Show("该文件下没有文件。", "提示", MessageBoxButton.OK, MessageBoxImage.Information);
                    this.txtPath.Focus();
                    return false;
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "错误", MessageBoxButton.OK, MessageBoxImage.Error);
                this.txtPath.Focus();
                return false;
            }
            return true;
        }

        private void Method()
        {
            FindFiles();
            this.progressBar1.Dispatcher.Invoke(new Action(() => { this.progressBar1.Value = 100; }));
            this.lblPercent.Dispatcher.Invoke(new Action(() => { this.lblPercent.Content = "100%"; }));
        }

        /// <summary>
        /// 查找文件
        /// </summary>
        private void FindFiles()
        {
            string[] fileNames = Directory.GetFiles(folderPath);
            var first = fileNames.Count(p => p.Contains(strKeyWord));
            this.progressBar1.Dispatcher.Invoke(new Action(() => { this.progressBar1.Maximum = (double)first; }));
            int i = 0;
            foreach (var file in fileNames)
            {
                if (file.Contains(strKeyWord))
                {
                    i++;
                    this.txtProcess.Dispatcher.Invoke(new Action(() => { this.txtProcess.Text = txtProcess.Text + "找到文件" + file + " "; }));
                    Thread.Sleep(100);

                    this.lblPercent.Dispatcher.Invoke(new Action(() =>
                    {
                        string str = (progressBar1.Value / (double)first * 100).ToString();
                        if (str.Length > 4)
                        {
                            str = str.Substring(0, 5);
                        }
                        this.lblPercent.Content = str + "%";
                    }));

                    this.progressBar1.Dispatcher.Invoke(new Action(() =>
                    {
                        this.progressBar1.Value = progressBar1.Value + 1;
                    }));

                }
            }

        }