下面的代码示例说明如何直接设置 ProgressBar 值。该代码从数据源中读取记录，并在每次读取数据记录时更新进度栏和标签。该示例要求窗体有一个 Label 控件、一个 ProgressBar 控件以及一个数据表，该数据表中名为

的行具有

和

字段

C#

public void createNewRecords()
{
   // Sets the progress bar's Maximum property to
   // the total number of records to be created.
   progressBar1.Maximum = 20;

   // Creates a new record in the dataset.
   // NOTE: The code below will not compile, it merely
   // illustrates how the progress bar would be used.
   CustomerRow anyRow = DatasetName.ExistingTable.NewRow();
   anyRow.FirstName = "Stephen";
   anyRow.LastName = "James";
   ExistingTable.Rows.Add(anyRow);

   // Increases the value displayed by the progress bar.
   progressBar1.Value += 1;
   // Updates the label to show that a record was read.
   label1.Text = "Records Read = " + progressBar1.Value.ToString();
}
如果要显示按固定时间间隔增长的进度，则可以设置该值，然后调用方法，使 ProgressBar 控件的值按该时间间隔递增。对于计时器以及其他一些您无法以整体的百分比测量进度的方案，这是非常有用的。 
使进度栏按固定值递增
设置 ProgressBar 控件的 Minimum 和 Maximum 值。
将控件的 Step 属性设置为一个整数，该整数代表进度栏的显示值递增的数量。 
调用 PerformStep 方法，使显示值按 Step 属性中设置的数量进行更改。 
下面的代码示例说明进度栏如何维护复制操作中的文件计数。 
在下面的示例中，当每个文件读入内存时，进度栏和标签都会相应地更新，以反映读取的文件总数。该示例要求窗体有一个 Label 控件和一个 ProgressBar 控件。
public void loadFiles()
{
   // Sets the progress bar's minimum value to a number representing
   // no operations complete -- in this case, no files read.
   progressBar1.Minimum = 0;
   // Sets the progress bar's maximum value to a number representing
   // all operations complete -- in this case, all five files read.
   progressBar1.Maximum = 5;
   // Sets the Step property to amount to increase with each iteration.
   // In this case, it will increase by one with every file read.
   progressBar1.Step = 1;

   // Uses a for loop to iterate through the operations to be
   // completed. In this case, five files are to be copied into memory,
   // so the loop will execute 5 times.
   for (int i = 0; i <= 4; i++)
   {
      // Inserts code to copy a file
      progressBar1.PerformStep();
      // Updates the label to show that a file was read.
      label1.Text = "# of Files Read = " + progressBar1.Value.ToString();
   }
}
最后，可以使进度栏的显示值每次递增的数量都是唯一的。这在您记录一系列唯一的操作时非常有用，例如将不同大小的文件写入硬盘，或者按整体的百分比测量进度。 
使进度栏按动态值递增
设置 ProgressBar 控件的 Minimum 和 Maximum 值。
调用 Increment 方法，使显示值按指定的整数进行更改。 
下面的代码示例说明在复制操作期间，进度栏如何计算已使用的磁盘空间量。 
在下面的示例中，当每个文件写入硬盘时，进度栏和标签都会相应地更新，以反映可用的硬盘空间量。该示例要求窗体有一个 Label 控件和一个 ProgressBar 控件。 
public void readFiles()
{
   // Sets the progress bar's minimum value to a number 
   // representing the hard disk space before the files are read in.
   // You will most likely have to set this using a system call.
   // NOTE: The code below is meant to be an example and 
   // will not compile.
   progressBar1.Minimum = AvailableDiskSpace();
   // Sets the progress bar's maximum value to a number 
   // representing the total hard disk space.
   // You will most likely have to set this using a system call.
   // NOTE: The code below is meant to be an example 
   // and will not compile.
   progressBar1.Maximum = TotalDiskSpace();

   // Uses a for loop to iterate through the operations to be
   // completed. In this case, five files are to be written
   // to the disk, so it will execute the loop 5 times.
   for (int i = 1; i<= 5; i++)
   {
      // Insert code to read a file into memory and update file size.
      // Increases the progress bar's value based on the size of 
      // the file currently being written.
      progressBar1.Increment(FileSize);
      // Updates the label to show available drive space.
      label1.Text = "Current Disk Space Used = " + progressBar1.Value.ToString();
   }
}