我想使用ListView的GridView模式显示我的程序将从外部源接收的一组数据。数据将包含两个数组,一个是列名,另一个是用于填充控件的字符串值。
我没有看到如何创建一个合适的类,我可以将其用作ListView中的Item。我知道填充Items的唯一方法是将它设置为一个具有表示列的属性的类,但我不知道运行时之前的列。
我可以动态创建一个ItemTemplate,如下所述:Create WPF ItemTemplate DYNAMICALLY at runtime但是它仍然让我不知道如何描述实际数据。
感激不尽的任何帮助。
答案 0 :(得分:11)
您可以使用如下方法在给定第一个数组的情况下动态地将GridViewColumns添加到GridView:
private void AddColumns(GridView gv, string[] columnNames)
{
for (int i = 0; i < columnNames.Length; i++)
{
gv.Columns.Add(new GridViewColumn
{
Header = columnNames[i],
DisplayMemberBinding = new Binding(String.Format("[{0}]", i))
});
}
}
我假设包含值的第二个数组的长度为ROWS * COLUMNS。在这种情况下,您的项目可以是长度为COLUMNS的字符串数组。您可以使用Array.Copy或LINQ来拆分数组。这个原则在这里得到证明:
<Grid>
<Grid.Resources>
<x:Array x:Key="data" Type="{x:Type sys:String[]}">
<x:Array Type="{x:Type sys:String}">
<sys:String>a</sys:String>
<sys:String>b</sys:String>
<sys:String>c</sys:String>
</x:Array>
<x:Array Type="{x:Type sys:String}">
<sys:String>do</sys:String>
<sys:String>re</sys:String>
<sys:String>mi</sys:String>
</x:Array>
</x:Array>
</Grid.Resources>
<ListView ItemsSource="{StaticResource data}">
<ListView.View>
<GridView>
<GridViewColumn DisplayMemberBinding="{Binding Path=[0]}" Header="column1"/>
<GridViewColumn DisplayMemberBinding="{Binding Path=[1]}" Header="column2"/>
<GridViewColumn DisplayMemberBinding="{Binding Path=[2]}" Header="column3"/>
</GridView>
</ListView.View>
</ListView>
</Grid>
答案 1 :(得分:5)
谢谢,这非常有帮助。
我用它来创建动态版本,如下所示。我按照你的建议创建了列标题:
private void AddColumns(List<String> myColumns)
{
GridView viewLayout = new GridView();
for (int i = 0; i < myColumns.Count; i++)
{
viewLayout.Columns.Add(new GridViewColumn
{
Header = myColumns[i],
DisplayMemberBinding = new Binding(String.Format("[{0}]", i))
});
}
myListview.View = viewLayout;
}
在XAML中非常简单地设置ListView:
<ListView Name="myListview" DockPanel.Dock="Left"/>
为ObservableCollection创建了一个包装类来保存我的数据:
public class MyCollection : ObservableCollection<List<String>>
{
public MyCollection()
: base()
{
}
}
将我的ListView绑定到它:
results = new MyCollection();
Binding binding = new Binding();
binding.Source = results;
myListview.SetBinding(ListView.ItemsSourceProperty, binding);
然后填充它,只是清除所有旧数据并添加新数据的情况:
results.Clear();
List<String> details = new List<string>();
for (int ii=0; ii < externalDataCollection.Length; ii++)
{
details.Add(externalDataCollection[ii]);
}
results.Add(details);
可能有更简洁的方法,但这对我的应用程序非常有用。再次感谢。
答案 2 :(得分:4)
CodeProject上的这篇文章解释了如何创建动态ListView - 当数据仅在运行时知道时。 http://www.codeproject.com/KB/WPF/WPF_DynamicListView.aspx
答案 3 :(得分:3)
不确定它是否仍然相关但我找到了一种使用celltemplate选择器设置单个单元格样式的方法。这有点hacky,因为你必须使用ContentPresenter的内容来获取单元格的正确DataContext(这样你就可以绑定到单元格模板中的实际单元格项目):
public class DataMatrixCellTemplateSelectorWrapper : DataTemplateSelector
{
private readonly DataTemplateSelector _ActualSelector;
private readonly string _ColumnName;
private Dictionary<string, object> _OriginalRow;
public DataMatrixCellTemplateSelectorWrapper(DataTemplateSelector actualSelector, string columnName)
{
_ActualSelector = actualSelector;
_ColumnName = columnName;
}
public override DataTemplate SelectTemplate(object item, DependencyObject container)
{
// The item is basically the Content of the ContentPresenter.
// In the DataMatrix binding case that is the dictionary containing the cell objects.
// In order to be able to select a template based on the actual cell object and also
// be able to bind to that object within the template we need to set the DataContext
// of the template to the actual cell object. However after the template is selected
// the ContentPresenter will set the DataContext of the template to the presenters
// content.
// So in order to achieve what we want, we remember the original DataContext and then
// change the ContentPresenter content to the actual cell object.
// Therefor we need to remember the orginal DataContext otherwise in subsequent calls
// we would get the first cell object.
// remember old data context
if (item is Dictionary<string, object>)
{
_OriginalRow = item as Dictionary<string, object>;
}
if (_OriginalRow == null)
return null;
// get the actual cell object
var obj = _OriginalRow[_ColumnName];
// select the template based on the cell object
var template = _ActualSelector.SelectTemplate(obj, container);
// find the presenter and change the content to the cell object so that it will become
// the data context of the template
var presenter = WpfUtils.GetFirstParentForChild<ContentPresenter>(container);
if (presenter != null)
{
presenter.Content = obj;
}
return template;
}
}
注意:我在CodeProject文章中更改了DataMatrix,以便行是字典(ColumnName - &gt; Cell Object)。
我不能保证这个解决方案不会破坏或将来不会破坏.Net版本。它依赖于ContentPresenter在将模板选择到其自己的内容之后设置DataContext的事实。 (反射器在这些情况下有很多帮助:))
创建GridColumns时,我会这样做:
var column = new GridViewColumn
{
Header = col.Name,
HeaderTemplate = gridView.ColumnHeaderTemplate
};
if (listView.CellTemplateSelector != null)
{
column.CellTemplateSelector = new DataMatrixCellTemplateSelectorWrapper(listView.CellTemplateSelector, col.Name);
}
else
{
column.DisplayMemberBinding = new Binding(string.Format("[{0}]", col.Name));
}
gridView.Columns.Add(column);
注意:我扩展了ListView,使其具有可以在xaml中绑定的CellTemplateSelector属性
@Edit 15/03/2011: 我写了一篇小文章,附有一个小小的演示项目:http://codesilence.wordpress.com/2011/03/15/listview-with-dynamic-columns/
答案 4 :(得分:1)
完全推进版本:
var view = grid.View as GridView;
view.Columns.Clear();
int count=0;
foreach (var column in ViewModel.GridData.Columns)
{
//Create Column
var nc = new GridViewColumn();
nc.Header = column.Field;
nc.Width = column.Width;
//Create template
nc.CellTemplate = new DataTemplate();
var factory = new FrameworkElementFactory(typeof(System.Windows.Controls.Border));
var tbf = new FrameworkElementFactory(typeof(System.Windows.Controls.TextBlock));
factory.AppendChild(tbf);
factory.SetValue(System.Windows.Controls.Border.BorderThicknessProperty, new Thickness(0,0,1,1));
factory.SetValue(System.Windows.Controls.Border.MarginProperty, new Thickness(-7,0,-7,0));
factory.SetValue(System.Windows.Controls.Border.BorderBrushProperty, Brushes.LightGray);
tbf.SetValue(System.Windows.Controls.TextBlock.MarginProperty, new Thickness(6,2,6,2));
tbf.SetValue(System.Windows.Controls.TextBlock.HorizontalAlignmentProperty, column.Alignment);
//Bind field
tbf.SetBinding(System.Windows.Controls.TextBlock.TextProperty, new Binding(){Converter = new GridCellConverter(), ConverterParameter=column.BindingField});
nc.CellTemplate.VisualTree = factory;
view.Columns.Add(nc);
count++;
}
答案 5 :(得分:1)
我会通过向GridView添加AttachedProperty来实现这一点,我的MVVM应用程序可以在其中指定列(可能还有一些额外的元数据)。然后,行为代码可以直接使用GridView对象动态地创建列。通过这种方式,您可以遵守MVVM,ViewModel可以动态指定列。