水平滚动条始终出现在WPF DataGrid中(Horizontal Scroll Bar Always Appearing in WPF DataGrid)

水平滚动条始终出现在WPF DataGrid中(Horizontal Scroll Bar Always Appearing in WPF DataGrid)

我正面临一个问题。 在我看来，我有一个DataGrid，其水平滚动条的可见性设置为自动。 我面临的问题是，即使有足够的空间让DataGrid扩展并完全显示自己，滚动条也会一直出现。 我已经尝试了几乎所有的东西，但无法弄清楚什么是错的。

我上传了一个示例应用程序来证明这里的问题。 希望有人能指出我正在制造的错误。

I am facing an issue. In my view I have a DataGrid whose Horizontal Scroll Bar's Visibility is set to Auto. Problem I am facing is that the scroll bar is appearing all the time even if there is enough space for DataGrid to expand and completely display itself. I have tried almost everything but couldn't figure out whats is wrong.

I have uploaded a sample application to demonstrate the problem here. Hoping anyone will point out mistake I am making.

最满意答案

我做了以下更改/解决方法来解决问题。 它可能不是完美的解决方案，但对我有用。

我在Grid添加了两个列，一个在开头，另一个在结尾。

<Grid.ColumnDefinitions> <ColumnDefinition Width="{Binding ElementName=m_DataGrid, Path=RowHeaderWidth}" /> <ColumnDefinition Width="{Binding ElementName=col1, Path=ActualWidth}" /> <ColumnDefinition Width="{Binding ElementName=col2, Path=ActualWidth}" /> <ColumnDefinition Width="{Binding ElementName=col3, Path=ActualWidth}" /> <ColumnDefinition Width="{Binding ElementName=col4, Path=ActualWidth}" /> <ColumnDefinition x:Name="specialCol" /> </Grid.ColumnDefinitions>

然后我增加了DataGrid的ColumnSpan

...Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="6" ....

然后我在Constrcutor of Window添加了这一行

specialCol.Width = new GridLength (2);

并将UpdateGrid方法更改为此

void UpdateGrid() { ScrollViewer scrollview = FindVisualChild<ScrollViewer>(m_DataGrid); Visibility verticalVisibility = scrollview.ComputedVerticalScrollBarVisibility; if (verticalVisibility == System.Windows.Visibility.Visible) { specialCol.Width = new GridLength(20); m_Border.Width = m_DataGrid.ActualWidth - m_DataGrid.RowHeaderWidth - 17; } else { specialCol.Width = new GridLength(2); m_Border.Width = m_DataGrid.ActualWidth - m_DataGrid.RowHeaderWidth; } }

在需要之前，我现在看不到任何HorizontalScrollBar

I did following changes/workarounds to solve the issue. It might not be the perfect solution but works for me.

I added two more columns in the Grid, one in the start and one at the end.

<Grid.ColumnDefinitions> <ColumnDefinition Width="{Binding ElementName=m_DataGrid, Path=RowHeaderWidth}" /> <ColumnDefinition Width="{Binding ElementName=col1, Path=ActualWidth}" /> <ColumnDefinition Width="{Binding ElementName=col2, Path=ActualWidth}" /> <ColumnDefinition Width="{Binding ElementName=col3, Path=ActualWidth}" /> <ColumnDefinition Width="{Binding ElementName=col4, Path=ActualWidth}" /> <ColumnDefinition x:Name="specialCol" /> </Grid.ColumnDefinitions>

Then I increased the ColumnSpan of DataGrid

...Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="6" ....

Then I added this line in Constrcutor of Window

specialCol.Width = new GridLength (2);

and changed UpdateGrid method to this

void UpdateGrid() { ScrollViewer scrollview = FindVisualChild<ScrollViewer>(m_DataGrid); Visibility verticalVisibility = scrollview.ComputedVerticalScrollBarVisibility; if (verticalVisibility == System.Windows.Visibility.Visible) { specialCol.Width = new GridLength(20); m_Border.Width = m_DataGrid.ActualWidth - m_DataGrid.RowHeaderWidth - 17; } else { specialCol.Width = new GridLength(2); m_Border.Width = m_DataGrid.ActualWidth - m_DataGrid.RowHeaderWidth; } }

I don't see any HorizontalScrollBar now until it is required