朋友我第一次使用转换器。我想在Bool和String之间进行转换，以实现Button＆＃39; Help＆＃39;的可见性目的。 HelpVisibility的Getter-Setter正在运行，但我不确定为什么按钮的可见性不起作用。以下是我的代码。请帮忙。
VehicalForm.xaml
<Window x:Class="Seris.VehicleForm"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="500" Width="650"
xmlns:l="clr-namespace:Seris.Converters">
<Window.Resources>
<l:Bool2String x:Key="converter" />
</Window.Resources>
<Control>
<Control.Template>
<ControlTemplate>
<WrapPanel Orientation="Vertical" Margin="10 " >
<Label Content="Vehical No" HorizontalAlignment="Left"/>
<TextBox Name="VehicalNo_Text" Height="23" Width="80" TextWrapping="Wrap" Text="{Binding VehicalNo, UpdateSourceTrigger=PropertyChanged}" HorizontalAlignment="Left" />
<Label Content="Model" HorizontalAlignment="Left"/>
<TextBox Name="Model_Text" Height="23" Width="80" TextWrapping="Wrap" Text="{Binding Model, UpdateSourceTrigger=PropertyChanged}" HorizontalAlignment="Left" />
<Label Content="Manufacturing Date" HorizontalAlignment="Left"/>
<DatePicker Name="ManufacturingDate_DateTime" SelectedDate="{Binding ManufacturingDate, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" Width="136"/>
<Label Content="IU No" HorizontalAlignment="Left"/>
<TextBox Height="23" Width="80" Name="IUNO_Text" TextWrapping="Wrap" Text="{Binding IUNo, UpdateSourceTrigger=PropertyChanged}" HorizontalAlignment="Left"/>
<Label Content="Personnel" HorizontalAlignment="Left"/>
<ComboBox Name="Personnel_Combo" SelectedValue="{Binding PersonnelNameSelected, UpdateSourceTrigger=PropertyChanged}" ItemsSource="{Binding PersonnelName, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" HorizontalAlignment="Left" Width="126"/>
<Separator Height="20" RenderTransformOrigin="0.5,0.5" Width="16"/>
<Button Name="Save_Button" Command="{Binding SaveButton_Command}" Content="Save" Width="66"/>
<Button Name="Replace_Button" CommandParameter="replace" IsEnabled="{Binding isEnableReplaceButton, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" Command="{Binding ReplaceButton_Command}" Content="Replace" Width="66"/>
<Button Name="Remove_Button" CommandParameter="replace" IsEnabled="{Binding isEnableReplaceButton, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" Command="{Binding RemoveButton_Command}" Content="Remove" Width="66"/>
<Label x:Name="Error_Label" Content="{Binding ErrorMessage, UpdateSourceTrigger=PropertyChanged}" Foreground="Red" HorizontalAlignment="Left" Height="41" Width="137"/>
<ListView Name ="Grid" Height="294" Width="371" >
<DataGrid Name="DG" ItemsSource="{Binding ListItems, UpdateSourceTrigger=PropertyChanged}" SelectedItem="{Binding SelectedRow, Mode=TwoWay}" GridLinesVisibility="None" IsReadOnly="True" AutoGenerateColumns="False" BorderThickness="0">
<DataGrid.Columns>
<DataGridTextColumn Header="Vehical No" Binding="{Binding VehicalNo}"/>
<DataGridTextColumn Header="Model" Binding="{Binding Model}" />
<DataGridTextColumn Header="ManufacturingDate" Binding="{Binding ManufacturingDate}" />
<DataGridTextColumn Header="IUNo" Binding="{Binding IUNo}" />
<DataGridTextColumn Header="Personnel" Binding="{Binding PersonnelNameSelected}" />
</DataGrid.Columns>
</DataGrid>
</ListView>
<TextBlock Name="Notification" Text="{Binding EditText, UpdateSourceTrigger=PropertyChanged}"/>
<ProgressBar Name="Progressbar" Minimum="0" Maximum="100" Value="{Binding Progress, UpdateSourceTrigger=PropertyChanged}" Height="11"/>
<TextBlock Text="{Binding ElementName=Progressbar, Path=Value, StringFormat={}{0:0}%}" HorizontalAlignment="Center" VerticalAlignment="Center" />
<Button Name="Help" Visibility="{Binding HelpVisibility, Converter={StaticResource converter}, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" CommandParameter="help" Height="50" Width="50" Click="Help_Click" HorizontalAlignment="Right">
<Image Height="45" Width="45" Source="../Images/help.jpg" HorizontalAlignment="Left"/>
</Button>
</WrapPanel>
</ControlTemplate>
</Control.Template>
</Control>
</Window>
Bool2String.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Data;
namespace Seris.Converters
{
class Bool2String : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
if (value is bool)
return bool.TrueString;
return null;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
if (value is string)
{
if (value == "true")
return true;
else if (value == "false")
return false;
}
return null;
}
}
}
VehicalMainViewModel.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Seris.Models;
using System.Collections.ObjectModel;
using System.Windows.Input;
using Seris.Commands;
using Seris.ViewModels;
using System.Windows;
using System.Windows.Controls;
using System.Threading;
using System.ComponentModel;
using Seris.Views;
namespace Seris.ViewModels
{
public class VehicleMainViewModel : ObservableObject
{
#region Getters-Setters
// Static Variables
private static bool _IsEnableReplaceButton;
public static bool IsEnableReplaceButton
{
get { return _IsEnableReplaceButton; }
set { _IsEnableReplaceButton = value; }
}
// Non-Static Variables
public ObservableCollection<VehicleModel> _listItems;
public ObservableCollection<VehicleModel> ListItems
{
get { return _listItems; }
set
{
if (value == null || (!value.Equals(_listItems)))
{
_listItems = value;
}
}
}
private int _Progress;
public int Progress
{
get { return _Progress; }
set { _Progress = value; OnPropertyChanged("Progress"); }
}
private string _ErroMesage;
public string ErrorMessage
{
get { return _ErroMesage; }
set
{
_ErroMesage = value; OnPropertyChanged("ErrorMessage");
if (ErrorMessage.Trim() == "" || ErrorMessage == null)
HelpVisibility = false;
else
HelpVisibility = true;
}
}
private bool _HelpVisibility;
public bool HelpVisibility
{
get { return _HelpVisibility; }
set { _HelpVisibility = value; OnPropertyChanged("HelpVisibility"); }
}
private Guid? _UniqueNo;
public Guid? UniqueNo
{
get { return _UniqueNo; }
set
{
if (value == null || (!value.Equals(_UniqueNo)))
{
_UniqueNo = value;
OnPropertyChanged("VehicalNo");
}
}
}
private string _VehicalNo;
public string VehicalNo
{
get { return _VehicalNo; }
set
{
if (value == null || (!value.Equals(_VehicalNo)))
{
_VehicalNo = value;
EditText = _VehicalNo;
OnPropertyChanged("VehicalNo");
}
}
}
private string _Model;
public string Model
{
get { return _Model; }
set
{
if (value == null || (!value.Equals(_Model)))
{
_Model = value;
EditText = _Model;
OnPropertyChanged("Model");
}
}
}
private DateTime? _ManufacturingDate;
public DateTime? ManufacturingDate
{
get { return _ManufacturingDate; }
set
{
if (value == null || (!value.Equals(_ManufacturingDate)))
{
_ManufacturingDate = value;
EditText = _ManufacturingDate.ToString();
OnPropertyChanged("ManufacturingDate");
}
}
}
private string _IUNo;
public string IUNo
{
get { return _IUNo; }
set
{
if (value == null || (!value.Equals(_IUNo)))
{
_IUNo = value;
EditText = _IUNo;
OnPropertyChanged("IUNo");
}
}
}
private ObservableCollection<string> _PersonnelName;
public ObservableCollection<string> PersonnelName
{
get { return _PersonnelName; }
set
{
if (value != _PersonnelName)
{
_PersonnelName = value;
EditText = _VehicalNo;
OnPropertyChanged("PersonnelName");
}
}
}
private string _PersonnelNameSelected;
public string PersonnelNameSelected
{
get { return _PersonnelNameSelected; }
set
{
if (value != _PersonnelNameSelected)
{
_PersonnelNameSelected = value;
EditText = _PersonnelNameSelected;
OnPropertyChanged("PersonnelNameSelected");
}
}
}
private string _EditText;
public string EditText
{
get { return _EditText; }
set
{
if (value != _EditText)
{
_EditText = value;
OnPropertyChanged("EditText");
}
}
}
private VehicleModel _SelectedRow;
public VehicleModel SelectedRow
{
get { return _SelectedRow; }
set
{
if (value != _SelectedRow)
{
_SelectedRow = value;
OnPropertyChanged("SelectedRow");
if (SelectedRow != null)
{
UniqueNo = _SelectedRow.UniqueNo;
VehicalNo = _SelectedRow.VehicalNo;
Model = _SelectedRow.Model;
ManufacturingDate = _SelectedRow.ManufacturingDate;
IUNo = _SelectedRow.IUNo;
PersonnelNameSelected = _SelectedRow.PersonnelNameSelected;
_IsEnableReplaceButton = true;
}
}
}
}
#endregion
#region Command Objects
private ICommand _saveButton_Command;
public ICommand SaveButton_Command
{
get { return _saveButton_Command; }
set { _saveButton_Command = value; }
}
private ICommand _ReplaceButton_Command;
public ICommand ReplaceButton_Command
{
get { return _ReplaceButton_Command; }
set { _ReplaceButton_Command = value; }
}
private ICommand _RemoveButton_Command;
public ICommand RemoveButton_Command
{
get { return _RemoveButton_Command; }
set { _RemoveButton_Command = value; }
}
#endregion
#region Methods
//Static Methods
#region Constructors
public VehicleMainViewModel()
{
// Initialization
VehicleModel vm = new VehicleModel();
ListItems = new ObservableCollection<VehicleModel>();
PersonnelName = ListOfPersonnelViewModel.PersonNameList_Updating;
//PersonnelName = new ObservableCollection<string>() { "ABC", "DEF", "GHI" };
// Setting Flags
ErrorMessage = "";
IsEnableReplaceButton = false;
//
// Commands Initialization
SaveButton_Command = new RelayCommand(new Action<object>(SaveToList));
ReplaceButton_Command = new RelayCommand(new Action<object>(ReplaceToList));
RemoveButton_Command = new RelayCommand(new Action<object>(RemoveList));
}
#endregion
}
}
答案 0 :(得分：1)
在转换器中，您应该返回Visibilty.Visible或Visibility.Collapsed，而不是true或false或字符串。
答案 1 :(得分：1)
可见性属性接受值为＆＃34;隐藏＆＃34;，＆＃34;折叠＆＃34;或＆＃34;可见＆＃34;。您需要将这些值设置为Visibility属性。
您可以参考以下链接获取BoolToVisibilityconverter的代码 WPF Converter Property
如果你发现它有用，请不要忘记回答。