我想在列中使用带有列表框的Listview。 [英] I would like to use a Listview with listboxes in the columns.

问题描述

我正在为应用程序编写排序/过滤器控件。我想要的是使用列表视图来显示过滤器，并能够添加和删除过滤器中的行。我还是WPF的新手，所以我可以相信我犯了一些明显的错误，或者错过了其他一些简单的错误。



我的listview，因为我现在有它在XAML中

< ListView Horizo​​ntalAlignment =StretchMargin =5Name =lvFilterVerticalAlignment =Stretch> 
< ListView.View> 
< GridView> 
< GridViewColumn Header =ColumnWidth =220> 
< GridViewColumn.CellTemplate> 
< DataTemplate> 
< ListBox Name =lbColumnListItemsSource ={Binding Path = Name，Source = {StaticResource AvailableColumns}}/> 
< / DataTemplate> 
< /GridViewColumn.CellTemplate> 
< / GridViewColumn> 
< GridViewColumn Header =OperationWidth =130> 
< GridViewColumn.CellTemplate> 
< DataTemplate> 
< ListBox Name =lbOperationItemsSource ={Binding Path = Value，Source = {StaticResource AvailableOperations}}/> 
< / DataTemplate> 
< /GridViewColumn.CellTemplate> 
< / GridViewColumn> 
< GridViewColumn Header =ValueWidth =250> 
< GridViewColumn.CellTemplate> 
< DataTemplate> 
< TextBox Name =txtValue>< / TextBox> 
< / DataTemplate> 
< /GridViewColumn.CellTemplate> 
< / GridViewColumn> 
< / GridView> 
< /ListView.View> 
< / ListView> 
 

我希望有2个下拉菜单和一个文本框。每个列表框都将绑定到有效列表。在查看已保存的过滤器时，每个AND将在列中包含操作和值的行。成本> 1000.



我遗漏了一些关于如何在这个级别使用ListView的关键信息，我还没有找到任何关闭的例子。没有人有如何在模板中使用绑定列表框的示例。



任何帮助或示例都将非常感激。

解决方案

我认为如果我理解你要构建的是什么，你的方法会稍微偏离。



本质上你想构建一个过滤器生成器是否正确？

所以你想用过滤器填充一个列表



这样的东西



列A | 运营商|价值|和/或

B栏| 运营商|价值|和/或

B栏| 运营商|价值|



如果是这种情况，我会使用更像这样的项目模板：



ComboBoxA | ComboBoxB |文本框| ComboboxC



ComboBoxA的数据源是可用列的列表

ComboBoxB的数据源是可用运算符的列表（可以根据所选列的数据类型

ComboBoxC为空/和/或（当它是最后一个选项时为空）然后只要选择And或Or，就可以添加主列表中的新条目。



这有意义吗？



------------ -------------------------------------------------- -



好​​的，所以这就是我制作的，这是一个非工作的例子，但它应该指向正确的方向。



这是一个要添加到Windows资源的DataTemplate：

 <   DataTemplate     x：键  =  filterEntry    DataType   =  MyClasses：FilterComponent >  
 <  网格 >  
 <   Grid.ColumnDefinitions  >  
 <   ColumnDefinition     /  >  
 <   ColumnDefinition     /  >  
 <   ColumnDefinition     /  >  
 <   ColumnDefinition     /  >  
 <   / Grid.ColumnDefinitions  >  
 <   ComboBox     Grid.Column   =  0   保证金  =  2    ItemsSource   =  {Binding Path = ColumnList}    SelectedItem   =  {Binding Path = Column}    /  >  
 < span class =code-keyword><   ComboBox     Grid.Column   =  1   保证金  =  2     ItemsSource   =  {Binding Path = OperatorList}    SelectedItem   =  {Binding Path =运营商}    /  >  
 <   TextBox     Grid.Column   =  2   保证金  =  2   文字  =  {Binding Path = FilterValue}    /  >  
 <   ComboBox     Grid.Column   =  3   保证金  =  2    ItemsSource   =  {Binding Path = CombinerOperator.Combiner}    SelectedItem   =  {Binding Path = Combiner}    /  >  
 <   / Grid  >  
 <   / DataTemplate  >  

这个的目的是你设计的名为FilterComponent的类，它具有以下属性：

Column，Operator，FilterValue和Combiner，它们共同构成过滤器的一部分。

然后使用模板选择器/列表中的一个样式，当选择一行时应用此数据模板（如果视图模式不是编辑，则不显示所有控件）。



在视图模型中，您有一个属性，它是构成过滤器的FilterComponents的可观察集合。此可观察集合充当列表视图/列表框的项目源。



您还需要属性/枚举等作为数据模板上的项目源应用。



希望这有助于指明你正确的方向。 ： - ）

I am writing a sort/filter control for an application. What I would like is to use a list view to display the filter and to be able to add and remove lines from the filter. I'm still fairly new to WPF so I can believe I've made some obvious mistakes or missed something else that is simple.

my listview as I currently have it in XAML

<ListView HorizontalAlignment="Stretch" Margin="5" Name="lvFilter" VerticalAlignment="Stretch">
    <ListView.View>
        <GridView>
            <GridViewColumn Header="Column" Width="220">
                <GridViewColumn.CellTemplate>
                    <DataTemplate>
                        <ListBox Name="lbColumnList" ItemsSource="{Binding Path=Name, Source={StaticResource AvailableColumns}}"/>
                    </DataTemplate>
                </GridViewColumn.CellTemplate>
            </GridViewColumn>
            <GridViewColumn Header="Operation" Width="130">
                <GridViewColumn.CellTemplate>
                    <DataTemplate>
                        <ListBox Name="lbOperation" ItemsSource="{Binding Path=Value, Source={StaticResource AvailableOperations}}"/>
                    </DataTemplate>
                </GridViewColumn.CellTemplate>
            </GridViewColumn>
            <GridViewColumn Header="Value" Width="250">
                <GridViewColumn.CellTemplate>
                    <DataTemplate>
                        <TextBox Name="txtValue"></TextBox>
                    </DataTemplate>
                </GridViewColumn.CellTemplate>
            </GridViewColumn>
        </GridView>
    </ListView.View>
</ListView>

I'm looking to have 2 dropdowns and a textbox. Each of the listboxes will be bound to a valid list. When looking at a saved filter each 'AND' will have a line with the column the operation and the value ie. COST > 1000.

I'm missing some critical information on how to use the ListView at this level and I haven't found any examples even close. No one has an example of how to use a bound listbox in the template.

Any help or examples would be much appreciated.

解决方案

I think your approach is slightly off if I am understanding what you are trying to build.

In essence you want to build a filter builder correct?
So you want to populate a list with the filters

so something like this

Column A | "operator" | value | And/Or
Column B | "operator" | value | And/Or
Column B | "operator" | value |

If that is the case, I would use an item template that is more like this:

ComboBoxA | ComboBoxB | Textbox | ComboboxC

ComboBoxA's datasource is a list of available columns
ComboBoxB's datasource is a list of available operators (which in turn can be filtered based on the datatype of the selected column
ComboBoxC is empty/and/or (empty for when it is the last option) then as soon as And or Or is selected a new entry in the main list can be added.

Does that make sense?

----------------------------------------------------------------

Okay, so this is what I produced, it is a non-working example but it should point you in the right direction.

This is a DataTemplate to be added to your windows resources:

<DataTemplate x:Key="filterEntry" DataType="MyClasses:FilterComponent">
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition />
                    <ColumnDefinition />
                    <ColumnDefinition />
                    <ColumnDefinition />
                </Grid.ColumnDefinitions>
                <ComboBox Grid.Column="0" Margin="2" ItemsSource="{Binding Path=ColumnList}" SelectedItem="{Binding Path=Column}" />
                <ComboBox Grid.Column="1" Margin="2" ItemsSource="{Binding Path=OperatorList}" SelectedItem="{Binding Path=Operator}" />
                <TextBox Grid.Column="2" Margin="2" Text="{Binding Path=FilterValue}" />
                <ComboBox Grid.Column="3" Margin="2" ItemsSource="{Binding Path=CombinerOperator.Combiner}" SelectedItem="{Binding Path=Combiner}" />
            </Grid>
        </DataTemplate>

The purpose of this is you designed a class called "FilterComponent" which has properties:
Column, Operator, FilterValue and Combiner, which together make up a section of the filter.
You then use a template selector / a style on the list which applies this data template when a row is selected (no point having all the controls displayed if it is view mode not edit).

On your view model, you have a property that is an observable collection of "FilterComponents" which make up your filter. This observable collection acts as the items source for the listview/listbox.

You also need properties/enums etc to apply as the items sources on the datatemplate.

Hopefully that should help point you in the right direction. :-)

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