我可以进行多绑定文本搜索吗 [英] Can I do Text search with multibinding

问题描述

我在mvvm-wpf应用程序中的组合框下方.我需要在其中实现文本搜索".(以及多重绑定).有人可以帮我吗?

I have below combo box in mvvm-wpf application. I need to implement "Text search" in this..(along with multibinding). Can anybody help me please.

<StackPanel Orientation="Horizontal">
    <TextBlock Text="Bid Service Cat ID"
                Margin="2"></TextBlock>
    <ComboBox Width="200"
                Height="20"
                SelectedValuePath="BidServiceCategoryId"
                SelectedValue="{Binding RelativeSource={RelativeSource AncestorType={x:Type UserControl}},
                    Path=DataContext.SelectedBidServiceCategoryId.Value}"
                ItemsSource="{Binding RelativeSource={RelativeSource AncestorType={x:Type UserControl}},
                    Path=DataContext.BenefitCategoryList}"
                Margin="12,0">
        <ComboBox.ItemTemplate>
            <DataTemplate>
                <TextBlock DataContext="{Binding}">
                            <TextBlock.Text>
                                <MultiBinding StringFormat="{}{0}: {1}">
                                <Binding Path="BidServiceCategoryId" />
                                <Binding Path="BidServiceCategoryName" />
                            </MultiBinding>
                            </TextBlock.Text></TextBlock>
            </DataTemplate>
        </ComboBox.ItemTemplate>
    </ComboBox>
</StackPanel>

推荐答案

不幸的是，TextSearch.Text在DataTemplate中不起作用.否则，您可能会做类似这样的事情

Unfortunately, TextSearch.Text doesn't work in a DataTemplate. Otherwise you could have done something like this

<ComboBox ...>
    <ComboBox.ItemContainerStyle>
        <Style TargetType="{x:Type ComboBoxItem}">
            <Setter Property="TextSearch.Text">
                <Setter.Value>
                    <MultiBinding StringFormat="{}{0}: {1}">
                        <Binding Path="BidServiceCategoryId"/>
                        <Binding Path="BidServiceCategoryName"/>
                    </MultiBinding>
                </Setter.Value>
            </Setter>
        </Style>
    </ComboBox.ItemContainerStyle>
</ComboBox>

但是这无法正常工作，因此我为您的问题提供了两种解决方案.

However this won't work, so I see two solutions to your problem.

第一种方式
您将ComboBox的IsTextSearchEnabled设置为True，在源类中覆盖ToString并将TextBlock中的MultiBinding更改为Binding

First way
You set IsTextSearchEnabled to True for the ComboBox, override ToString in your source class and change the MultiBinding in the TextBlock to a Binding

Xaml

<ComboBox ...
          IsTextSearchEnabled="True">
    <ComboBox.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding}"/>
        </DataTemplate>
    </ComboBox.ItemTemplate>

源类

public class TheNameOfYourSourceClass
{
    public override string ToString()
    {
        return String.Format("{0}: {1}", BidServiceCategoryId, BidServiceCategoryName);
    }
    //...
}

---

第二种方式
如果您不想覆盖ToString，我认为您必须在源类中引入一个新的Property，在其中将BidServiceCategoryId和BidServiceCategoryName组合为TextSearch.TextPath.在此示例中，我将其称为BidServiceCategory.为了使它起作用，您还必须在BidServiceCategoryId或BidServiceCategoryName更改时调用OnPropertyChanged("BidServiceCategory");.如果它们是普通的CLR属性，则可以在set中执行此操作；如果它们是依赖项属性，则必须使用更改后的属性回调

---

Second Way
If you don't want to override ToString I think you'll have to introduce a new Property in your source class where you combine BidServiceCategoryId and BidServiceCategoryName for the TextSearch.TextPath. In this example I call it BidServiceCategory. For this to work, you'll have to call OnPropertyChanged("BidServiceCategory"); when BidServiceCategoryId or BidServiceCategoryName changes as well. If they are normal CLR properties, you can do this in set, and if they are dependency properties you'll have to use the property changed callback

Xaml

<ComboBox ...
          TextSearch.TextPath="BidServiceCategory"
          IsTextSearchEnabled="True">
    <ComboBox.ItemTemplate>
        <DataTemplate>
            <TextBlock DataContext="{Binding}">
                <TextBlock.Text>
                    <MultiBinding StringFormat="{}{0}: {1}">
                        <Binding Path="BidServiceCategoryId" />
                        <Binding Path="BidServiceCategoryName" />
                    </MultiBinding>
                </TextBlock.Text>
            </TextBlock>
        </DataTemplate>
    </ComboBox.ItemTemplate>

源类

public class TheNameOfYourSourceClass
{
    public string BidServiceCategory
    {
        get
        {
            return String.Format("{0}: {1}", BidServiceCategoryId, BidServiceCategoryName);
        }
    }

    private string m_bidServiceCategoryId;
    public string BidServiceCategoryId
    {
        get
        {
            return m_bidServiceCategoryId;
        }
        set
        {
            m_bidServiceCategoryId = value;
            OnPropertyChanged("BidServiceCategoryId");
            OnPropertyChanged("BidServiceCategory");
        }
    }

    private string m_bidServiceCategoryName;
    public string BidServiceCategoryName
    {
        get
        {
            return m_bidServiceCategoryName;
        }
        set
        {
            m_bidServiceCategoryName = value;
            OnPropertyChanged("BidServiceCategoryName");
            OnPropertyChanged("BidServiceCategory");
        }
    }
}

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