現在、システムでのHDDの使用状況を表示するアプリケーションを実行しています。そのために、グリッドとコントロール(プログレスバーやラベルなど)を動的に生成して、使用法を示したいと思います。この目的で利用できるXAMLテンプレートはありますか?
次のコードを使用して、コード内で動的にコントロールを生成します
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) {}
}
関数GetHardDiskDrives()およびSetWindowHeight()は、ユーザー定義関数です。 jpbは、ハードドライブを取得し、追加された新しいコントロールに従ってウィンドウの高さを設定することです。
インラインコメントのために他の答えが混乱していることがわかりました... columnDEFINITIONを追加すると(たとえば)まったく何も「描画」されません-これは初心者にとって非常に誤解を招く恐れがあります。
また、行はすでに選択されていても繰り返し選択されます...これは無駄なオーバーヘッドを追加するだけです。これにより、数百行を使用している場合、アプリが非常に遅くなります。
WindowHeightの設定と同じです。
VB.NETでの動的な行と列の管理のための(やや)より効率的なソリューションは次のとおりです(非同期処理に切り替える場合は、Invoke()の代わりにDispatcher.BeginInvoke()を使用してください)
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