本教程主要為大家講解C1DataGrid for WPF的過濾。

多行條件過濾

多行過濾是默認(rèn)過濾條件的擴(kuò)展。實(shí)際上，過濾條件的數(shù)目是不受限制的，可以按照用戶選擇增加。和多值類似，可以自定義任意列的過濾，通過在XAML里設(shè)置Filter屬性。例如，為了繼承多條件過濾，添加C1MultiLineTextFilter 給任何的文字列（注意：也同樣對DateTimeHe Numeric起作用）。代碼參考：

<c1:C1DataGrid Name="c1DataGrid1" AutoGenerateColumns="False" CanUserFilter="True">
<c1:C1DataGrid.Columns>
<c1:DataGridTextColumn Header="Flavor" Binding="{Binding FlavorName}" FilterMemberPath="FlavorName">
<!--Add Multi-Line Filter-->
<c1:DataGridTextColumn.Filter>
<c1:DataGridContentFilter >
<c1:DataGridMultiLineTextFilter />
</c1:DataGridContentFilter>
</c1:DataGridTextColumn.Filter>
</c1:DataGridTextColumn>
<!—Add Other Columns -->
...
</c1:C1DataGrid.Columns>
</c1:C1DataGrid>

效果如圖：

混合過濾

對于用戶來看，這是很普遍的。C1DataGrid支持各種類型的過濾，通過DataGridFilterList類就能實(shí)現(xiàn)。例如，如果您想要展示條件文字過濾和數(shù)字過濾，就可以如下所示：

<c1:C1DataGrid Name="c1DataGrid1" ItemsSource="{Binding Flavors}" AutoGenerateColumns="False" CanUserFilter="True">
<c1:C1DataGrid.Columns>
<c1:DataGridTextColumn Header="Flavor" Binding="{Binding FlavorName}" FilterMemberPath="FlavorName" />
<c1:DataGridCheckBoxColumn Header="Has Nuts" Binding="{Binding IncludesNuts}" FilterMemberPath="IncludesNuts" />
<c1:DataGridTextColumn Header="Percent" Format="p1" Binding="{Binding Percent}" FilterMemberPath="Percent">
<c1:DataGridTextColumn.Filter>
<c1:DataGridContentFilter >
<c1:DataGridFilterList>
<c1:DataGridTextFilter />
<c1:DataGridNumericFilter Format="p1" />
</c1:DataGridFilterList>
</c1:DataGridContentFilter>
</c1:DataGridTextColumn.Filter>
</c1:DataGridTextColumn>
</c1:C1DataGrid.Columns>
</c1:C1DataGrid>

如圖所示：

模板列過濾

模板列不支持默認(rèn)過濾，但是您依然可以通過設(shè)置Filter屬性自定義過濾。例如，如下展示了如何給模板列設(shè)置多值過濾：

<c1:C1DataGrid Name="c1DataGrid1" ItemsSource="{Binding Flavors}" AutoGenerateColumns="False" CanUserFilter="True">
<c1:C1DataGrid.Columns>
<!--Add Template Column-->
<c1:DataGridTemplateColumn Header="Flavor" FilterMemberPath="FlavorName">
<c1:DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<TextBlock Text="{Binding FlavorName}" />
</DataTemplate>
</c1:DataGridTemplateColumn.CellTemplate>
<!--Add Multi-Value Filter-->
<c1:DataGridTemplateColumn.Filter>
<c1:DataGridContentFilter >
<c1:DataGridMultiValueFilter ItemsSource="{Binding Flavors}" MaxHeight="200" DisplayMemberPath="FlavorName" ValueMemberPath="FlavorName" />
</c1:DataGridContentFilter>
</c1:DataGridTemplateColumn.Filter>
</c1:DataGridTemplateColumn>
<!--Add Other Columns-->
...
</c1:C1DataGrid.Columns>
</c1:C1DataGrid>

代碼操作過濾

之前都是討論如何在XAML中實(shí)現(xiàn)過濾。現(xiàn)在就來講講這些用代碼如何設(shè)置。主要就是有兩個(gè)關(guān)鍵的事件：FilterLoading和FilterOpened。設(shè)置一個(gè)新的多值過濾，代碼如下：

private void dataGrid_FilterLoading(object sender, DataGridColumnEditableValueEventArgs<IDataGridFilter> e)
{
var column = e.Column;

var multiValueFilter = new DataGridMultiValueFilter();
(e.Value as DataGridFilter).InnerControl = multiValueFilter;
}

如下是如何在打開和操作多值列表的時(shí)候，獲取過濾。

void dataGrid_FilterOpened(object sender, DataGridColumnValueEventArgs<IDataGridFilter> e)
{
var boundColumn = e.Column as DataGridBoundColumn;
if (boundColumn == null)
return;

// create and set multi-value filter control into the column
var filterControl = (DataGridMultiValueFilter)((DataGridFilter)e.Value).InnerControl;
filterControl.ItemsSource = items.Select(selector).Distinct().OrderBy(o => o);
}

如果是默認(rèn)過濾或是高級默認(rèn)過濾，需要在FilterOpened事件中獲取它們，并且動態(tài)應(yīng)用。例如，想要改變DateTime過濾的StartDate，或是如果需要調(diào)整期望的多值過濾，e.Column.Filter參數(shù)將可以獲取到默認(rèn)過濾。e.Value參數(shù)可以獲取高級過濾。如下：

void c1DataGrid1_FilterOpened(object sender, C1.Silverlight.DataGrid.DataGridColumnValueEventArgs<C1.Silverlight.DataGrid.IDataGridFilter> e)
{
// e.Column.Filter gives you default column filter
DataGridDateTimeFilter dgdf = e.Column.Filter as DataGridDateTimeFilter;
if (dgdf != null)
{
dgdf.StartDate = new DateTime(2011, 1, 1);
}

// e.Value gives you advanced filter
DataGridContentFilter dgcf = e.Value as DataGridContentFilter;
if (dgcf != null)
{
DataGridFilterList dgfl = dgcf.Content as DataGridFilterList;
if (dgfl != null)
{
if (dgfl.Items.Count > 1)
{
DataGridMultiValueFilter dgmv = dgfl.Items[1] as DataGridMultiValueFilter;
// set filter
// dgmv.Filter =
}
}
}
}

自定義過濾

過濾的功能還不止于此。用戶還可以做自定義過濾，分配特定的列。

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