我是C ++开发人员，最近我转到了C＃。我正在使用MVVM模式开发一个wpf应用程序。我的xaml文件中有一个groupboxbox，我将其分为两列。一列包含动态生成的一组radiobuttons，其他列包含一个标签和许多组合框。
XAML：
<GroupBox Header="Daughter Cards" Height="Auto" HorizontalAlignment="Stretch" Margin="20,5,20,20" Name="groupBox2" VerticalAlignment="Stretch" Width="Auto">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition Width="220" />
</Grid.ColumnDefinitions>
<Grid Grid.Column="0">
<ItemsControl ItemsSource="{Binding SlotChildren}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<UniformGrid />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<RadioButton Content="{Binding SlotButtons}" Margin="0,10,0,0" IsChecked="{Binding IsChecked}" GroupName="SlotGroup" Height="15" Width="80" HorizontalAlignment="Center" VerticalAlignment="Center"/>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</Grid>
<Grid Grid.Column="1">
<ComboBox ItemsSource="{Binding DaughterBoardBoxList}" SelectedItem="{Binding SelectedDaughterBoardBoxList, Mode=TwoWay}" SelectedIndex="0" Height="23" HorizontalAlignment="Center" Margin="0" Name="comboBox5" VerticalAlignment="Center" Width="158" />
<ComboBox ItemsSource="{Binding DaughterVersionBoxList}" SelectedItem="{Binding SelectedDaughterVersionBoxList, Mode=TwoWay}" SelectedIndex="0" Height="23" HorizontalAlignment="Center" Margin="0" Name="comboBox6" VerticalAlignment="Center" Width="158" />
<ComboBox ItemsSource="{Binding DaughterSerialBoxList}" SelectedItem="{Binding SelectedDaughterSerialBoxList, Mode=TwoWay}" SelectedIndex="0" Height="23" HorizontalAlignment="Center" Margin="0" Name="comboBox7" VerticalAlignment="Center" Width="158" />
<Label Content="{Binding DaughterStatus}" Height="25" HorizontalAlignment="Center" Margin="0" Name="DaughterCardLabel" VerticalAlignment="Center" Width="170" />
<ComboBox Height="23" ItemsSource="{Binding I2CAddressList}" SelectedItem="{Binding SelectedI2CAddressList, Mode=TwoWay}" SelectedIndex="0" Grid.Row="0" HorizontalAlignment="Center" Margin="0,0,0,0" Name="comboBox1" VerticalAlignment="Center" Width="200" />
<ComboBox Height="23" ItemsSource="{Binding BoardBoxList}" SelectedItem="{Binding SelectedBoardBoxList, Mode=TwoWay}" SelectedIndex="0" Grid.Row="1" HorizontalAlignment="Center" Margin="0,0,0,0" Name="comboBox2" VerticalAlignment="Center" Width="200" />
<ComboBox Height="23" ItemsSource="{Binding VersionBoxList}" SelectedItem="{Binding SelectedVersionBoxList, Mode=TwoWay}" SelectedIndex="0" Grid.Row="2" HorizontalAlignment="Center" Margin="0,0,0,0" Name="comboBox3" VerticalAlignment="Center" Width="200" />
<ComboBox Height="23" ItemsSource="{Binding SerialBoxList}" SelectedItem="{Binding SelectedSerialBoxList, Mode=TwoWay}" SelectedIndex="0" Grid.Row="3" HorizontalAlignment="Center" Margin="0,0,0,0" Name="comboBox4" VerticalAlignment="Center" Width="200" />
</Grid>
</Grid>
</GroupBox>
EEPROMViewModel类： xaml的DataContext设置为此类。在同一个班级：
Byte[] sendBuf = new Byte[256];
Byte[] readBuf = new Byte[256];
public ObservableCollection<EEPROMSlotViewModel> SlotChildren { get; set; }
public ObservableCollection<string> _I2CAddressList;
public ObservableCollection<string> _BoardBoxList;
public ObservableCollection<string> _VersionBoxList;
public ObservableCollection<string> _SerialBoxList;
public ObservableCollection<string> _DBoardBoxList;
public ObservableCollection<string> _DVersionBoxList;
public ObservableCollection<string> _DSerialBoxList;
public EEPROMViewModel()
{
SlotChildren = new ObservableCollection<EEPROMSlotViewModel>();
SlotChildren.Add(new EEPROMSlotViewModel() { SlotButtons = "0 : None", ID = 0 });
SlotChildren.Add(new EEPROMSlotViewModel() { SlotButtons = "1 : None", ID = 1 });
SlotChildren.Add(new EEPROMSlotViewModel() { SlotButtons = "2 : None", ID = 2 });
SlotChildren.Add(new EEPROMSlotViewModel() { SlotButtons = "3 : None", ID = 3 });
SlotChildren.Add(new EEPROMSlotViewModel() { SlotButtons = "4 : None", ID = 4 });
SlotChildren.Add(new EEPROMSlotViewModel() { SlotButtons = "5 : None", ID = 5 });
SlotChildren.Add(new EEPROMSlotViewModel() { SlotButtons = "6 : None", ID = 6 });
SlotChildren.Add(new EEPROMSlotViewModel() { SlotButtons = "7 : None", ID = 7 });
SlotChildren.Add(new EEPROMSlotViewModel() { SlotButtons = "8 : None", ID = 8 });
SlotChildren.Add(new EEPROMSlotViewModel() { SlotButtons = "9 : None", ID = 9 });
SlotChildren.Add(new EEPROMSlotViewModel() { SlotButtons = "10 : None", ID = 10 });
SlotChildren.Add(new EEPROMSlotViewModel() { SlotButtons = "11 : None", ID = 11 });
SlotChildren.Add(new EEPROMSlotViewModel() { SlotButtons = "12 : None", ID = 12 });
SlotChildren.Add(new EEPROMSlotViewModel() { SlotButtons = "13 : None", ID = 13 });
SlotChildren.Add(new EEPROMSlotViewModel() { SlotButtons = "14 : None", ID = 14 });
SlotChildren.Add(new EEPROMSlotViewModel() { SlotButtons = "15 : None", ID = 15 });
SlotChildren.Add(new EEPROMSlotViewModel() { SlotButtons = "16 : None", ID = 16 });
SlotChildren.Add(new EEPROMSlotViewModel() { SlotButtons = "17 : None", ID = 17 });
SlotChildren.Add(new EEPROMSlotViewModel() { SlotButtons = "18 : None", ID = 18 });
SlotChildren.Add(new EEPROMSlotViewModel() { SlotButtons = "19 : None", ID = 19 });
SlotChildren.Add(new EEPROMSlotViewModel() { SlotButtons = "20 : None", ID = 20 });
SlotChildren.Add(new EEPROMSlotViewModel() { SlotButtons = "21 : None", ID = 21 });
SlotChildren.Add(new EEPROMSlotViewModel() { SlotButtons = "22 : None", ID = 22 });
SlotChildren.Add(new EEPROMSlotViewModel() { SlotButtons = "23 : None", ID = 23 });
var myboard = new[]
{
"",
"S1010012", // redhook
"S1010018", // bavaria
"S1010020" // flying dog
};
var myVariant = new[]
{
"",
"001A",
"001B",
"001C",
"002A",
"002B",
"002C",
"003A",
"003B",
"003C",
};
_I2CAddressList = new ObservableCollection<string>();
_BoardBoxList = new ObservableCollection<string>(myboard);
_VersionBoxList = new ObservableCollection<string>(myVariant);
_SerialBoxList = new ObservableCollection<string>();
for (int i = 1; i < 200; i++)
{
_SerialBoxList.Add(i.ToString());
}
//List of I2C Address
_I2CAddressList.Add("0x50");
_I2CAddressList.Add("0x53");
this.SelectedI2CAddressList = this._I2CAddressList[1];
this.SelectedBoardBoxList = this.BoardBoxList[2];
this.SelectedVersionBoxList = this.VersionBoxList[2];
this.SelectedSerialBoxList = this.SerialBoxList[0];
var myDBoards = new[]
{
"",
"S1010013",
"S1010014",
"S1010015",
"S1010017",
"S1010019",
"S1010021",
"S1010023",
"S1010026",
"S1110029",
};
_DBoardBoxList = new ObservableCollection<string>(myDBoards);
_DVersionBoxList = new ObservableCollection<string>(myVariant);
_DSerialBoxList = new ObservableCollection<string>();
for (int j = 1; j < 500; j++)
{
_DSerialBoxList.Add(j.ToString());
}
}
public ObservableCollection<string> I2CAddressList
{
get { return _I2CAddressList; }
set
{
_I2CAddressList = value;
OnPropertyChanged("I2CAddressList");
}
}
private string _SelectedI2CAddressList;
public string SelectedI2CAddressList
{
get { return _SelectedI2CAddressList; }
set
{
_SelectedI2CAddressList = value;
OnPropertyChanged("SelectedI2CAddressList");
}
}
public ObservableCollection<string> BoardBoxList
{
get { return _BoardBoxList; }
set
{
_BoardBoxList = value;
OnPropertyChanged("BoardBoxList");
}
}
private string _SelectedBoardBoxList;
public string SelectedBoardBoxList
{
get { return _SelectedBoardBoxList; }
set
{
_SelectedBoardBoxList = value;
OnPropertyChanged("SelectedBoardBoxList");
}
}
public ObservableCollection<string> VersionBoxList
{
get { return _VersionBoxList; }
set
{
_VersionBoxList = value;
OnPropertyChanged("VersionBoxList");
}
}
private string _SelectedVersionBoxList;
public string SelectedVersionBoxList
{
get { return _SelectedVersionBoxList; }
set
{
_SelectedVersionBoxList = value;
OnPropertyChanged("SelectedVersionBoxList");
}
}
public ObservableCollection<string> SerialBoxList
{
get { return _SerialBoxList; }
set
{
_SerialBoxList = value;
OnPropertyChanged("SerialBoxList");
}
}
private string _SelectedSerialBoxList;
public string SelectedSerialBoxList
{
get { return _SelectedSerialBoxList; }
set
{
_SelectedSerialBoxList = value;
OnPropertyChanged("SelectedSerialBoxList");
}
}
char[] version =
{
'A', 'U', 'D', 'I', 'E', 'N', 'C', 'E', // name
'0', '0', '0', '0', '0', '0', '0', '0' , // reserved, firmware size
'0', '0', '0', '0', '0', '0', '0', '0' , // board number
'0', '0', '0', '0', '0', '0', '0', '0' , // variant, version, serial
'0', '0', '0', '0', '0', '0', '0', '0' // date code, reserved
};
public ObservableCollection<string> DaughterBoardBoxList
{
get { return _DBoardBoxList; }
set
{
_DBoardBoxList = value;
OnPropertyChanged("DaughterBoardBoxList");
}
}
public string _SelectedDBoardBoxList;
public string SelectedDaughterBoardBoxList
{
get { return _SelectedDBoardBoxList; }
set
{
_SelectedDBoardBoxList = value;
OnPropertyChanged("SelectedDaughterBoardBoxList");
}
}
public ObservableCollection<string> DaughterVersionBoxList
{
get { return _DVersionBoxList; }
set
{
_DVersionBoxList = value;
OnPropertyChanged("DaughterVersionBoxList");
}
}
public string _SelectedDVersionBoxList;
public string SelectedDaughterVersionBoxList
{
get { return _SelectedDVersionBoxList; }
set
{
_SelectedDVersionBoxList = value;
OnPropertyChanged("SelectedDaughterVersionBoxList");
}
}
public ObservableCollection<string> DaughterSerialBoxList
{
get { return _DSerialBoxList; }
set
{
_DSerialBoxList = value;
OnPropertyChanged("DaughterSerialBoxList");
}
}
private string _SelectedDSerialBoxList;
public string SelectedDaughterSerialBoxList
{
get { return _SelectedDSerialBoxList; }
set
{
_SelectedDSerialBoxList = value;
OnPropertyChanged("SelectedDaughterSerialBoxList");
}
}
private string _DaughterStatus = "Not Retrieved yet";
public string DaughterStatus
{
get { return _DaughterStatus; }
set
{
_DaughterStatus = value;
OnPropertyChanged("DaughterStatus");
}
}
EEPROMSlotViewModel类：
EEPROMViewModel mVMModel = new EEPROMViewModel();
private string _SlotButtons;
public string SlotButtons
{
get; set;
}
private int _ID;
public int ID
{
get; set;
}
private bool _isChecked;
public bool IsChecked
{
get { return _isChecked; }
set
{
_isChecked = value;
OnSlotClick(ID);
OnPropertyChanged("IsChecked");
}
}
public void OnSlotClick(int Index)
{
string label = string.Empty;
if (Index >= 0 && Index < 24)
{
//getShortName(Index, label);
if (label == string.Empty)
{
SlotButtons = Convert.ToString(Index + " : None");
}
else
{
SlotButtons = Convert.ToString(Index + " :" + label);
}
}
if (label != string.Empty)
{
label += " - ";
//getLongName(Index, label);
}
else
{
label = "No device found at this slot";
}
mVMModel.DaughterStatus = label; // displays it in the label
}
当我尝试运行应用程序时，它崩溃并抛出异常作为stackoverflow。当我检查任何单选按钮并调用关节方法时，问题似乎出现在 EEPROMSlotViewModel 中。
我在这里犯的错误是什么？ :( 请帮助：）
答案 0 :(得分：1)
您的问题在mVMModel.DaughterStatus = label; // displays it in the label上，您可能在EEPROMSlotViewModel中实例化EEPROMViewModel类，这会导致无限循环。
要解决此问题，您需要访问您的parentVM，可以使用Interfaces来显示，只显示DaughterStatus，但快速回答如下：
向EEPROMSlotViewModel添加属性：
public EEPROMViewModel ParentVM
{
get { return _parentVm; }
set
{
_parentVm = value;
OnPropertyChanged("ParentVM");
}
}
而不是mVMModel.DaughterStatus = label;放ParentVM.DaughterStatus = label;
最后：
SlotChildren.Add(new EEPROMSlotViewModel() { ParentVM = this, SlotButtons = "0 : None", ID = 0 });