Como manipular colunas e linhas usando ColumnDefinitionsCollections e RowDefinitionsCollections

Este exemplo mostra como usar os métodos nas classes ColumnDefinitionCollection e RowDefinitionCollection para executar ações como adicionar, limpar ou contar o conteúdo de linhas ou colunas. Por exemplo, você pode Add, Clearou Count os itens que estão incluídos em um ColumnDefinition ou um RowDefinition.

Exemplo

O exemplo a seguir cria um elemento Grid com um Name de grid1. O Grid contém um StackPanel que contém elementos Button, cada um controlado por um método de coleção diferente. Quando você clica em um Button, ele ativa uma chamada de método no arquivo 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>

Este exemplo define uma série de métodos personalizados, cada um correspondente a um evento Click no arquivo XAML (Extensible Application Markup Language). Você pode alterar o número de colunas e linhas no Grid de várias maneiras, o que inclui adicionar ou remover linhas e colunas; e contando o número total de linhas e colunas. Para evitar exceções ArgumentOutOfRangeException e ArgumentException, você pode usar a funcionalidade de verificação de erros fornecida pelo método 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

Consulte também

• Grid
• ColumnDefinitionCollection
• RowDefinitionCollection