如何使用Value Converter for Listbox，textblock作为datatemplate [英] How to use Value Converter for Listbox , textblock as datatemplate

问题描述

HI，

我的列表框如下所示，其中textblock作为项目模板中的datatemplate，我有observablecollection类型字符串，我想在Listbox中显示我正在使用Ivalueconverter将其转换为Textblock，因为我需要说一些字Bold

I have listbox as below which has textblock as datatemplate inside item template, I have observablecollection type string which I want to show in Listbox for which I am converting that to Textblock using Ivalueconverter, as I need to make some word Bold

<ListBox x:Name="chatListBoxMsgs">

       <ListBox.Resources>
           <viewmodel:convert x:Key="PositionConverter"/>
       </ListBox.Resources>
       <ListBox.ItemTemplate>
           <DataTemplate>
               <TextBlock Text="{Binding Converter={StaticResource PositionConverter}}"/>
               <TextBlock/>
           </DataTemplate>
       </ListBox.ItemTemplate>
   </ListBox>

从后面的代码我绑定它如下，

From code behind I am binding it as follow,

ObservableCollection<string> MessageHistory = new ObservableCollection<string>();
MessageHistory.Add("Agent: how can I help you");
MessageHistory.Add("Customer: I need to get this");
chatListBoxMsgs.ItemsSource = MessageHistory;

我需要收转代理：和客户：以上收藏中的大胆，所以我使用的是Ivalueconverter，如下所示

I need to conver "Agent:" and "customer:" bold in above collection so I am using Ivalueconverter as below

public class convert : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            if (value != null)
            {
                TextBlock _tbl= new TextBlock();
                

          //Here I have code to make Agent bold, and then return                     

                return _tbl;
            }

            return string.Empty;
        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }

    } 

我的问题是我我没有在Listbox中获取消息而是获取system.control.textblock。我需要在Listbox中以粗体显示上面的字符串





这就是我使用ConverterClass的方式。

My problem is that I am not getting the message in Listbox instead getting system.control.textblock. I need to display above string with Agent in bold in Listbox


This is how I have used ConverterClass.

<ListBox.Resources>
                <viewmodel:convert x:Key="PositionConverter"/>
            </ListBox.Resources>
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding Converter={StaticResource PositionConverter}}"/>   
                    <TextBlock/>
                </DataTemplate>
            </ListBox.ItemTemplate>

我需要帮助。可能是我无法绑定，提前谢谢

I need help here. May be I am not able to bind, Thanks in advance

推荐答案

你一定不能使用TextBlock并绑定到Text，因为这最终会将结果转换为String。



使用ContentPresenter代替，而不是

Hi,

you must not use TextBlock and bind to Text, since this will ultimately convert the result to a String.

Use ContentPresenter instead, i.e. instead of

<datatemplate>
     <textblock text="{Binding Converter={StaticResource PositionConverter}}"></textblock>
                    <textblock></textblock>
     </datatemplate>

使用

use

<datatemplate>
     <ContentPresenter Content="{Binding Converter={StaticResource PositionConverter}}"></ContentPresenter>
                    <textblock></textblock>
</datatemplate>

这篇关于如何使用Value Converter for Listbox，textblock作为datatemplate的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！