ProgressBar.Minimum 屬性

定義

命名空間:

System.Windows.Forms

組件:

System.Windows.Forms.dll

取得或設定控制項範圍的最小值。

public:
 property int Minimum { int get(); void set(int value); };

public int Minimum { get; set; }

member this.Minimum : int with get, set

Public Property Minimum As Integer

屬性值

Int32

範圍的最小值。 預設值是 0。

例外狀況

ArgumentException

這個屬性的指定值小於 0。

範例

下列程式碼範例會使用 ProgressBar 控制項來顯示檔案複製作業的進度。 此範例會使用 Minimum 和 Maximum 屬性，指定要 ProgressBar 複製之 檔案數目的 範圍。 程式碼也會使用 Step 屬性搭配 PerformStep 方法，以複製檔案時遞增 的值 ProgressBar 。 此範例會要求您建立 ProgressBar 名為 pBar1 的 Form 控制項，該控制項是在 內建立，而且有一個稱為 CopyFile (建立的方法，會傳回布林值，指出檔案複製作業已順利完成，) 執行檔案複製作業。 程式碼也需要建立包含要複製之檔案的字串陣列，並傳遞至 CopyWithProgress 範例中定義的方法，並且從 中的另一個方法或事件 Form 呼叫 方法。

private:
   void CopyWithProgress( array<String^>^filenames )
   {
      // Display the ProgressBar control.
      pBar1->Visible = true;

      // Set Minimum to 1 to represent the first file being copied.
      pBar1->Minimum = 1;

      // Set Maximum to the total number of files to copy.
      pBar1->Maximum = filenames->Length;

      // Set the initial value of the ProgressBar.
      pBar1->Value = 1;

      // Set the Step property to a value of 1 to represent each file being copied.
      pBar1->Step = 1;

      // Loop through all files to copy.
      for ( int x = 1; x <= filenames->Length; x++ )
      {
         // Copy the file and increment the ProgressBar if successful.
         if ( CopyFile( filenames[ x - 1 ] ) == true )
         {
            // Perform the increment on the ProgressBar.
            pBar1->PerformStep();
         }
      }
   }

private void CopyWithProgress(string[] filenames)
{
    // Display the ProgressBar control.
    pBar1.Visible = true;
    // Set Minimum to 1 to represent the first file being copied.
    pBar1.Minimum = 1;
    // Set Maximum to the total number of files to copy.
    pBar1.Maximum = filenames.Length;
    // Set the initial value of the ProgressBar.
    pBar1.Value = 1;
    // Set the Step property to a value of 1 to represent each file being copied.
    pBar1.Step = 1;
    
    // Loop through all files to copy.
    for (int x = 1; x <= filenames.Length; x++)
    {
        // Copy the file and increment the ProgressBar if successful.
        if(CopyFile(filenames[x-1]) == true)
        {
            // Perform the increment on the ProgressBar.
            pBar1.PerformStep();
        }
    }
}

Private Sub CopyWithProgress(ByVal ParamArray filenames As String())
    ' Display the ProgressBar control.
    pBar1.Visible = True
    ' Set Minimum to 1 to represent the first file being copied.
    pBar1.Minimum = 1
    ' Set Maximum to the total number of files to copy.
    pBar1.Maximum = filenames.Length
    ' Set the initial value of the ProgressBar.
    pBar1.Value = 1
    ' Set the Step property to a value of 1 to represent each file being copied.
    pBar1.Step = 1

    ' Loop through all files to copy.
    Dim x As Integer
    for x = 1 To filenames.Length - 1
        ' Copy the file and increment the ProgressBar if successful.
        If CopyFile(filenames(x - 1)) = True Then
            ' Perform the increment on the ProgressBar.
            pBar1.PerformStep()
        End If
    Next x
End Sub

備註

這個屬性會指定屬性的 Value 下限。 當屬性的值 Minimum 變更時，控制項 ProgressBar 會重新繪製以反映控制項的新範圍。 當 屬性的值 Value 等於 屬性的值 Minimum 時，進度列會是空的。 若要變更進度列的值，請使用 Step 屬性搭配 PerformStep 方法、使用 Increment 方法，或直接設定 屬性的值 Value 。

另請參閱

• Maximum
• Value