使用计时器更新DataGrid中的单个列

本文介绍了使用计时器更新DataGrid中的单个列的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我发现 此主题，解释了如何实现计时器来更新DataGrid的一列。简单地说，我不能让它适合我的情况。我想ping一台计算机，然后用图像（.png）更新该列。我觉得我太近了...

I found this thread that explains how to implement a timer to update one column of a DataGrid. Simply put, I can't make it work for my situation. I want to ping a computer and then update that column with an image (.png). I feel like I'm so close...

XAML

<local:StatusConverter x:Key="onlineConverter" /> ... <DataGrid.Columns> <DataGridTemplateColumn x:Name="Online" Header="Online" IsReadOnly="True" Width="45" > <DataGridTemplateColumn.CellTemplate> <DataTemplate> <Image Height="20" Width="20" Source="{Binding Status, Converter={StaticResource onlineConverter}}" /> </DataTemplate> </DataGridTemplateColumn.CellTemplate> </DataGridTemplateColumn> </DataGrid.Columns>

背后代码

Code behind

public partial class MainWindow : Window { char[] splitchar = { ',' }; private Process update; public MainWindow() { InitializeComponent(); }

{

public class OnlineInd：INotifyPropertyChanged { private Timer timer; 公共事件PropertyChangedEventHandler PropertyChanged; public void NotifyPropertyChanged（string propertyName） { PropertyChanged？.Invoke（this，new PropertyChangedEventArgs（propertyName））; } public OnlineInd（） { timer = new Timer（TimeSpan.FromSeconds（30）.TotalMilliseconds）; timer.Elapsed + = Timer_Elapsed; timer.AutoReset = true; timer.Enabled = true; } private void Timer_Elapsed（对象发送者，ElapsedEventArgs e） { Ping pinger = new Ping（）; 尝试 { PingReply reply = pinger.Send（" device"，1500）; if（reply.Status == IPStatus.Success） { Status = true; NotifyPropertyChanged（" Status"）; } 其他 {状态=假; NotifyPropertyChanged（" Status"）; } } catch（PingException） {} } private Boolean _status = false; public Boolean状态 { get { return _status; } 设置 { _status = value; NotifyPropertyChanged（" Status"）; } } } 公共类StatusConverter：IValueConverter {公共对象转换（对象值，类型targetType ，对象参数，CultureInfo文化） { if（（bool）value == true） { return Properties.Resources.green_light; } 其他 {返回Properties.Resources.red_light; } } 公共对象ConvertBack（对象值，类型targetType，对象参数，CultureInfo文化） { throw new NotImplementedException（）; } }

public class OnlineInd : INotifyPropertyChanged { private Timer timer; public event PropertyChangedEventHandler PropertyChanged; public void NotifyPropertyChanged(string propertyName) { PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName)); } public OnlineInd() { timer = new Timer(TimeSpan.FromSeconds(30).TotalMilliseconds); timer.Elapsed += Timer_Elapsed; timer.AutoReset = true; timer.Enabled = true; } private void Timer_Elapsed(object sender, ElapsedEventArgs e) { Ping pinger = new Ping(); try { PingReply reply = pinger.Send("device", 1500); if (reply.Status == IPStatus.Success) { Status = true; NotifyPropertyChanged("Status"); } else { Status = false; NotifyPropertyChanged("Status"); } } catch (PingException) { } } private Boolean _status = false; public Boolean Status { get { return _status; } set { _status = value; NotifyPropertyChanged("Status"); } } } public class StatusConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { if ((bool)value == true) { return Properties.Resources.green_light; } else { return Properties.Resources.red_light; } } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) { throw new NotImplementedException(); } }

推荐答案

我注意到我收到了这个Binding错误。

I notice that I get this Binding error.

System.Windows.Data Error: 40 : BindingExpression path error: 'Status' property not found on 'object' ''String' (HashCode=9712865)'. BindingExpression:Path=Status; DataItem='String' (HashCode=9712865); target element is 'Image' (Name=''); target property is 'Source' (type 'ImageSource')