在WPF中动态添加网格和控件

Question

我现在正在做一个应用程序，显示系统中的HDD使用情况。为此，我想动态生成网格和控件（如进度条和标签）以显示使用情况。有没有可用于此目的的XAML模板？

Answer 1

我使用如下因素代码在我的代码动态地生成控制

Label[] drivesLabel; 
Label[] percentageLabel; 
ProgressBar[] drivesProgress; 
int drivesCount = 0; 

private void DrawControls() 
{ 
    try 
    { 
     // Getting drive list. 
     List<DriveInfo> driveList = GetHardDiskDrives(); 
     drivesCount = driveList.Count; 

     // Initializing new Grid. 
     Grid drivesGrid = new Grid(); 
     drivesGrid.Children.Clear(); 
     DrivesBorder.Child = drivesGrid; 

     // Adding Rows and Colums to Grid. 
     RowDefinition[] rows = new RowDefinition[2*drivesCount + 1]; 
     ColumnDefinition[] columns = new ColumnDefinition[6]; 

     // Draw Rows. 
     for (int i = 0; i < 2*drivesCount + 1; i++) 
     { 
      rows[i] = new RowDefinition(); 
      drivesGrid.RowDefinitions.Add(rows[i]); 

      // Setting Row height. 
      rows[i].Height = (0 == i % 2) ? new GridLength(5): new GridLength(25); 
     } 
     // Draw Columns. 
     for (int i = 0; i < 6; i++) 
     { 
      columns[i] = new ColumnDefinition(); 
      drivesGrid.ColumnDefinitions.Add(columns[i]); 
      if (i % 2 == 0) 
      { 
       // Setting column width. 
       columns[i].Width = new GridLength(5); 
      } 
     } 

     // Setting column width. 
     columns[1].Width = new GridLength(60); 
     columns[3].Width = new GridLength(180); 
     columns[5].Width = new GridLength(60); 

     // Draw Labels to show drive letters. 
     drivesLabel = new Label[drivesCount]; 

     // Draw Progress bar to show drive usage. 
     drivesProgress = new ProgressBar[drivesCount]; 

     // Draw Labels to show drive usage. 
     percentageLabel = new Label[drivesCount]; 

     // Adding Labels and Progressbars to Grid. 
     for (int i = 0, j = 1; i < drivesCount; i++, j++) 
     { 
      // Initialize Labels to show drives. 
      drivesLabel[i] = new Label(); 
      drivesLabel[i].Content = driveList[i].Name; 
      drivesLabel[i].Foreground = Brushes.Navy; 
      Grid.SetRow(drivesLabel[i], i + j); 
      Grid.SetColumn(drivesLabel[i], 1); 
      drivesGrid.Children.Add(drivesLabel[i]); 

      // Initialize ProgressBar to show usage. 
      drivesProgress[i] = new ProgressBar(); 
      drivesProgress[i].FlowDirection = FlowDirection.LeftToRight; 
      drivesProgress[i].HorizontalAlignment = HorizontalAlignment.Center; 
      drivesProgress[i].VerticalAlignment = VerticalAlignment.Center; 
      drivesProgress[i].Orientation= Orientation.Horizontal; 
      drivesProgress[i].Value = 0; 
      drivesProgress[i].Maximum = 100; 
      drivesProgress[i].Width = 180; 
      drivesProgress[i].Height = 18; 
      Grid.SetRow(drivesProgress[i], i + j); 
      Grid.SetColumn(drivesProgress[i], 3); 
      drivesGrid.Children.Add(drivesProgress[i]); 

      // Initialize Labels to show usage in percentage. 
      percentageLabel[i] = new Label(); 
      percentageLabel[i].Content = "0 %"; 
      Grid.SetRow(percentageLabel[i], i + j); 
      Grid.SetColumn(percentageLabel[i], 5); 
      drivesGrid.Children.Add(percentageLabel[i]); 

      // Setting window height. 
      SetWindowHeight(30); 
     } 
    } 
    catch(Exception Ex) {} 
} 

功能GetHardDiskDrives（）和SetWindowHeight（）是用户定义的函数。 jpb将获得硬盘驱动器并根据添加的新控件设置窗口高度。

Answer 2

我发现另一个答案令人困惑，因为内嵌注释...添加一个columnDEFINITION（例如）“绘制”绝对没有 - 这对初学者来说非常具有误导性。

此外：即使它们已被选中，行也会被重复选择......这只会增加无用的开销。如果你使用几百行，这会让你的应用真的很慢。

与设置WindowHeight相同。

这里有一个（有点）更高效地为动态记录&列管理VB.NET解决方案： （使用Dispatcher.BeginInvoke（）而不是调用（），如果你想切换到异步处理）

Private Delegate Sub MyDelegate3(ByVal iByte As Byte) 
Private Delegate Function MyDelegate4() As Byte 

Public Property GridColumns As Byte 
     Get 
      Dim del As New MyDelegate4(AddressOf GetColumns) 
      Return grid.Dispatcher.Invoke(del) 
     End Get 

     Set(ByVal value As Byte) 
      Dim del As MyDelegate3 
      If GridColumns > 0 Then 
       Dim diff As SByte = GridColumns - value 
       If diff > 0 Then 'Spalten abziehen 
        del = New MyDelegate3(AddressOf RemColDefs) 
        grid.Dispatcher.Invoke(del, diff) 
       Else    'Spalten hinzufügen 
        del = New MyDelegate3(AddressOf AddColDefs) 
        grid.Dispatcher.Invoke(del, Math.Abs(diff)) 
       End If 
      Else 
       del = New MyDelegate3(AddressOf AddColDefs) 
       grid.Dispatcher.Invoke(del, value) 
      End If 
     End Set 
    End Property 

    Public Property GridRows As Byte 
     Get 
      Dim del As New MyDelegate4(AddressOf GetRows) 
      Return grid.Dispatcher.Invoke(del) 
     End Get 
     Set(value As Byte) 
      Dim del As MyDelegate3 
      If GridRows > 0 Then 
       Dim diff As SByte = GridRows - value 
       If diff > 0 Then 'Zeilen abziehen 
        del = New MyDelegate3(AddressOf RemRowDefs) 
        grid.Dispatcher.Invoke(del, diff) 
       Else    'Spalten hinzufügen 
        del = New MyDelegate3(AddressOf AddRowDefs) 
        grid.Dispatcher.Invoke(del, Math.Abs(diff)) 
       End If 
      Else 
       del = New MyDelegate3(AddressOf AddRowDefs) 
       grid.Dispatcher.Invoke(del, value) 
      End If 
     End Set 
    End Property 

    Private Function GetRows() As Byte 
     Return grid.RowDefinitions.Count 
    End Function 
    Private Function GetColumns() As Byte 
     Return grid.ColumnDefinitions.Count 
    End Function 

    Private Sub AddRowDefs(ByVal iRows As Byte) 
     For r As Byte = 1 To iRows 
      Dim rowDef As New RowDefinition 
      rowDef.Height = GridLength.Auto 
      grid.RowDefinitions.Add(rowDef) 
     Next   
    End Sub 
    Private Sub RemRowDefs(ByVal iRows As Byte) 
     For r As Byte = 1 To iRows 
      If grid.RowDefinitions.Count > 0 Then 
       grid.RowDefinitions.Remove(grid.RowDefinitions(0)) 
      End If 
     Next    
    End Sub 

    Private Sub AddColDefs(ByVal iCols As Byte) 
     For r As Byte = 1 To iCols 
      Dim colDef As New ColumnDefinition 
      colDef.Width = GridLength.Auto 
      grid.ColumnDefinitions.Add(colDef) 
     Next    
    End Sub 
    Private Sub RemColDefs(ByVal iCols As Byte) 
     For r As Byte = 1 To iCols 
      If grid.ColumnDefinitions.Count > 0 Then 
       grid.ColumnDefinitions.Remove(grid.ColumnDefinitions(0)) 
      End If 
     Next    
    End Sub