如何绑定和自动更新列表框wpf [英] How to bind and auto update listbox wpf

问题描述

好的，这里有好几个问题



首先



这是我的实施，但它不起作用我怎样才能使它工作？

Ok here several questions

First

This is my implementation but it is not working atm how can i make it work ?

    <Grid> // xaml part
    <Button Content="Start Crawling Root Sites - This Deletes All Data" HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top" Width="279" Command="{Binding StartCrawling}" Click="click_start_Crawling"  />
    <ListBox Name="lstBoxEvents" HorizontalAlignment="Left"  Height="138" Margin="294,10,0,0" VerticalAlignment="Top" Width="312">
        <ListBox.ItemTemplate>
            <DataTemplate>
                <Grid Margin="1">
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="Auto" />
                    </Grid.ColumnDefinitions>
                    <TextBlock Grid.Column="1" Text="{Binding ocEvents}"  />
                </Grid>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>
</Grid>

    private void click_start_Crawling(object sender, RoutedEventArgs e) // inside mainwindow
{
    PublicStaticFunctions.AddMsgToEvents("trial");
}

    public static class PublicStaticFunctions // seperate class
{
    public static ObservableCollection<string> ocEvents = new ObservableCollection<string>();

    public static void AddMsgToEvents(string srMessage)
    {
        ocEvents.Insert(0, srMessage);
    }
}

运行时的第二个问题多线程，如果多个线程访问AddMsgToEvents函数并添加变量，列表框是否会自动刷新而没有任何问题？



非常感谢

My second question when running multithreaded, if multiple threads access AddMsgToEvents function and adds variable, would listbox still auto refresh without any problem ?

Thank you very much

推荐答案

第一期



你需要绑定ItemsSource列表框然后在文本框中的每个项目。它会工作



例如： -

Hi,

First issue

You need to bind the ItemsSource of List box then in the textbox each item. It will work

e.g:-

<listbox itemssource="{Binding Components, Mode=OneWay}" /> 

<listbox name="lstBoxEvents" horizontalalignment="Left" height="138" margin="294,10,0,0" verticalalignment="Top" width="312" itemssource="{Binding ocEvents}">
            <listbox.itemtemplate>
                <datatemplate>
                    <grid margin="1">
                        <grid.columndefinitions>
                            <columndefinition width="Auto" />
                        </grid.columndefinitions>
                        <textblock grid.column="1" text="{Binding Path=ocEvent}" />
                    </grid>
                </datatemplate>
            </listbox.itemtemplate>
        </listbox>

其中ocEvent是一个字符串类型的字段



第二期



如果你正在使用多线程然后会出现问题，因为一个线程锁定的资源不能被其他线程使用。要解决此问题，您需要使用

where ocEvent is a field of type string

for the second issue

if you are using multithreads then there will be issue because a resource locked by one thread cannot be used by other thread. To resolve this you need to use

Application.Current.Dispatcher.Invoke(new Action(delegate
{
    ocEvents.Insert(0, srMessage);
}));

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