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Procedura: Modificare colonne e righe usando ColumnDefinitionsCollections e RowDefinitionsCollections

  • Articolo

In questo esempio viene illustrato come usare i metodi nelle classi ColumnDefinitionCollection e RowDefinitionCollection per eseguire azioni come l'aggiunta, la cancellazione o il conteggio del contenuto di righe o colonne. Ad esempio, è possibile Add, Clearo Count gli elementi inclusi in un ColumnDefinition o RowDefinition.

Esempio

Nell'esempio seguente viene creato un elemento Grid con un Name di grid1. L'Grid contiene una StackPanel che contiene Button elementi, ognuno controllato da un metodo di raccolta diverso. Quando si fa clic su un Button, viene attivata una chiamata al metodo nel file code-behind.

<DockPanel Margin="10,0,0,0">

    <TextBlock FontSize="20" FontWeight="Bold" DockPanel.Dock="Top">Grid Column and Row Collections</TextBlock>
    <TextBlock DockPanel.Dock="Top">Click any of the buttons below to invoke the associated methods and properties of ColumnDefinition and RowDefinition Collections.</TextBlock>
    <Grid DockPanel.Dock="Top" HorizontalAlignment="Left" Name="grid1" ShowGridLines="true" Width="625" Height="400" Background="#b0e0e6">
        <Grid.ColumnDefinitions>
            <ColumnDefinition/>
            <ColumnDefinition/>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
        </Grid.RowDefinitions>
    </Grid>

    <StackPanel HorizontalAlignment="Left" Orientation="Horizontal" Width="625" DockPanel.Dock="Top">
        <Button Width="125" Click="addCol">Add Column</Button>
        <Button Width="125" Click="addRow">Add Row</Button>
        <Button Width="125" Click="clearCol">Clear All Columns</Button>
        <Button Width="125" Click="clearRow">Clear All Rows</Button>
        <Button Width="125" Click="removeCol">Remove One Column</Button>
    </StackPanel>
    <StackPanel HorizontalAlignment="Left" Orientation="Horizontal" Width="625" DockPanel.Dock="Top">
        <Button Width="125" Click="removeRow">Remove One Row</Button>
        <Button Width="125" Click="colCount">How Many Columns?</Button>
        <Button Width="125" Click="rowCount">How Many Rows?</Button>
        <Button Width="125" Click="rem5Col">Remove 5 Columns</Button>
        <Button Width="125" Click="rem5Row">Remove 5 Rows</Button>
    </StackPanel>
    <StackPanel HorizontalAlignment="Left" Orientation="Horizontal" Width="625" DockPanel.Dock="Top">
        <Button Width="125" Click="containsRow">Contains Row?</Button>
        <Button Width="125" Click="containsCol">Contains Column?</Button>
        <Button Width="125" Click="insertRowAt">Insert Row</Button>
        <Button Width="125" Click="insertColAt">Insert Column</Button>
        <Button Width="125" Click="colReadOnly">IsReadOnly?</Button>
    </StackPanel>
    <TextBlock DockPanel.Dock="Top" Name="tp1"/>
    <TextBlock DockPanel.Dock="Top" Name="tp2"/>
    <TextBlock DockPanel.Dock="Top" Name="tp3"/>
    <TextBlock DockPanel.Dock="Top" Name="tp4"/>
    <TextBlock DockPanel.Dock="Top" Name="tp5"/>
</DockPanel>

Questo esempio definisce una serie di metodi personalizzati, ognuno corrispondente a un evento Click nel file XAML (Extensible Application Markup Language). È possibile modificare il numero di colonne e righe nel Grid in diversi modi, che includono l'aggiunta o la rimozione di righe e colonne; conteggiando il numero totale di righe e colonne. Per evitare ArgumentOutOfRangeException e ArgumentException eccezioni, è possibile usare la funzionalità di controllo degli errori fornita dal metodo RemoveRange.

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;

namespace columndefinitions_grid
{
    public partial class Window1 : Window
    {
        RowDefinition rowDef1;
        ColumnDefinition colDef1;

        private void addCol(object sender, RoutedEventArgs e)
        {
            colDef1 = new ColumnDefinition();
            grid1.ColumnDefinitions.Add(colDef1);
        }

        private void addRow(object sender, RoutedEventArgs e)
        {
            rowDef1 = new RowDefinition();
            grid1.RowDefinitions.Add(rowDef1);
        }

        private void clearCol(object sender, RoutedEventArgs e)
        {
            grid1.ColumnDefinitions.Clear();
        }

        private void clearRow(object sender, RoutedEventArgs e)
        {
            grid1.RowDefinitions.Clear();
        }

        private void removeCol(object sender, RoutedEventArgs e)
        {
            if (grid1.ColumnDefinitions.Count <= 0)
            {
                tp1.Text = "No More Columns to Remove!";
            }
            else
            {
                grid1.ColumnDefinitions.RemoveAt(0);
            }
        }

        private void removeRow(object sender, RoutedEventArgs e)
        {
            if (grid1.RowDefinitions.Count <= 0)
            {
                tp1.Text = "No More Rows to Remove!";
            }
            else
            {
                grid1.RowDefinitions.RemoveAt(0);
            }
        }

        private void colCount(object sender, RoutedEventArgs e)
        {
            tp2.Text = "The current number of Columns is: " + grid1.ColumnDefinitions.Count;
        }

        private void rowCount(object sender, RoutedEventArgs e)
        {
            tp2.Text = "The current number of Rows is: " + grid1.RowDefinitions.Count;
        }

        private void rem5Col(object sender, RoutedEventArgs e)
        {
            if (grid1.ColumnDefinitions.Count < 5)
            {
                tp1.Text = "There aren't five Columns to Remove!";
            }
            else
            {
                grid1.ColumnDefinitions.RemoveRange(0,5);
            }
        }

        private void rem5Row(object sender, RoutedEventArgs e)
        {
            if (grid1.RowDefinitions.Count < 5)
            {
                tp1.Text = "There aren't five Rows to Remove!";
            }
            else
            {
                grid1.RowDefinitions.RemoveRange(0, 5);
            }
        }

        private void containsRow(object sender, RoutedEventArgs e)
        {
            if (grid1.RowDefinitions.Contains(rowDef1))
            {
                tp2.Text = "Grid Contains RowDefinition rowDef1";
            }
            else
            {
                tp2.Text = "Grid Does Not Contain RowDefinition rowDef1";
            }
        }

        private void containsCol(object sender, RoutedEventArgs e)
        {
            if (grid1.ColumnDefinitions.Contains(colDef1))
            {
                tp3.Text = "Grid Contains ColumnDefinition colDef1";
            }
            else
            {
                tp3.Text = "Grid Does Not Contain ColumnDefinition colDef1";
            }
        }

        private void colReadOnly(object sender, RoutedEventArgs e)
        {
            tp4.Text = "RowDefinitionsCollection IsReadOnly?: " + grid1.RowDefinitions.IsReadOnly.ToString();
            tp5.Text = "ColumnDefinitionsCollection IsReadOnly?: " + grid1.ColumnDefinitions.IsReadOnly.ToString();
        }

        private void insertRowAt(object sender, RoutedEventArgs e)
        {
            rowDef1 = new RowDefinition();
            grid1.RowDefinitions.Insert(grid1.RowDefinitions.Count, rowDef1);
            tp1.Text = "RowDefinition added at index position " + grid1.RowDefinitions.IndexOf(rowDef1).ToString();
        }

        private void insertColAt(object sender, RoutedEventArgs e)
        {
            colDef1 = new ColumnDefinition();
            grid1.ColumnDefinitions.Insert(grid1.ColumnDefinitions.Count, colDef1);
            tp2.Text = "ColumnDefinition added at index position " + grid1.ColumnDefinitions.IndexOf(colDef1).ToString();
        }
    }
}

Imports System.Windows     
Imports System.Windows.Controls     
Imports System.Windows.Documents     

Namespace SDKSample

    '@ <summary>
    '@ Interaction logic for Window1.xaml
    '@ </summary>

    Partial Public Class Window1
        Inherits Window

        Dim rowDef1 As New RowDefinition
        Dim colDef1 As New ColumnDefinition

        Private Sub addCol(ByVal sender As Object, ByVal e As RoutedEventArgs)
            Dim colDef1 As New ColumnDefinition
            grid1.ColumnDefinitions.Add(colDef1)
        End Sub

        Private Sub addRow(ByVal sender As Object, ByVal e As RoutedEventArgs)
            Dim rowDef1 As New RowDefinition()
            grid1.RowDefinitions.Add(rowDef1)
        End Sub

        Private Sub clearCol(ByVal sender As Object, ByVal e As RoutedEventArgs)
            grid1.ColumnDefinitions.Clear()
        End Sub

        Private Sub clearRow(ByVal sender As Object, ByVal e As RoutedEventArgs)
            grid1.RowDefinitions.Clear()
        End Sub

        Private Sub removeCol(ByVal sender As Object, ByVal e As RoutedEventArgs)

            If (grid1.ColumnDefinitions.Count <= 0) Then
                tp1.Text = "No More Columns to Remove!"
            Else
                grid1.ColumnDefinitions.RemoveAt(0)
            End If
        End Sub

        Private Sub removeRow(ByVal sender As Object, ByVal e As RoutedEventArgs)
            If (grid1.RowDefinitions.Count <= 0) Then
                tp1.Text = "No More Rows to Remove!"
            Else
                grid1.RowDefinitions.RemoveAt(0)
            End If
        End Sub

        Private Sub colCount(ByVal sender As Object, ByVal e As RoutedEventArgs)
            tp2.Text = "The current number of Columns is: " + grid1.ColumnDefinitions.Count.ToString()
        End Sub

        Private Sub rowCount(ByVal sender As Object, ByVal e As RoutedEventArgs)
            tp2.Text = "The current number of Rows is: " + grid1.RowDefinitions.Count.ToString()
        End Sub

        Private Sub rem5Col(ByVal sender As Object, ByVal e As RoutedEventArgs)
            If (grid1.ColumnDefinitions.Count < 5) Then
                tp1.Text = "There aren't five Columns to Remove!"
            Else
                grid1.ColumnDefinitions.RemoveRange(0, 5)
            End If
        End Sub

        Private Sub rem5Row(ByVal sender As Object, ByVal e As RoutedEventArgs)
            If (grid1.RowDefinitions.Count < 5) Then
                tp1.Text = "There aren't five Rows to Remove!"
            Else
                grid1.RowDefinitions.RemoveRange(0, 5)
            End If
        End Sub

        Private Sub containsRow(ByVal sender As Object, ByVal e As RoutedEventArgs)
            If (grid1.RowDefinitions.Contains(rowDef1)) Then
                tp2.Text = "Grid Contains RowDefinition rowDef1"
            Else
                tp2.Text = "Grid Does Not Contain RowDefinition rowDef1"
            End If
        End Sub

        Private Sub containsCol(ByVal sender As Object, ByVal e As RoutedEventArgs)
            If (grid1.ColumnDefinitions.Contains(colDef1)) Then
                tp3.Text = "Grid Contains ColumnDefinition colDef1"
            Else
                tp3.Text = "Grid Does Not Contain ColumnDefinition colDef1"
            End If
        End Sub

        Private Sub colReadOnly(ByVal sender As Object, ByVal e As RoutedEventArgs)
            tp4.Text = "RowDefinitionsCollection IsReadOnly?: " + grid1.RowDefinitions.IsReadOnly.ToString()
            tp5.Text = "ColumnDefinitionsCollection IsReadOnly?: " + grid1.ColumnDefinitions.IsReadOnly.ToString()
        End Sub

        Private Sub insertRowAt(ByVal sender As Object, ByVal e As RoutedEventArgs)
            Dim rowDef1 As New RowDefinition
            grid1.RowDefinitions.Insert(grid1.RowDefinitions.Count, rowDef1)
            tp1.Text = "RowDefinition added at index position " + grid1.RowDefinitions.IndexOf(rowDef1).ToString()
        End Sub

        Private Sub insertColAt(ByVal sender As Object, ByVal e As RoutedEventArgs)
            Dim colDef1 As New ColumnDefinition()
            grid1.ColumnDefinitions.Insert(grid1.ColumnDefinitions.Count, colDef1)
            tp2.Text = "ColumnDefinition added at index position " + grid1.ColumnDefinitions.IndexOf(colDef1).ToString()
        End Sub


    End Class
End Namespace

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