组合框在数据网格中的绑定给出了错误 [英] Binding of combobox within datagrid is giving error
问题描述
大家好，
我查看如下
< window x：class = TestWPFApplication.MainWindowxmlns：x =＃unknown>
xmlns =http://schemas.microsoft.com/winfx/2006/xaml/presentation
xmlns：testns =clr-namespace：TestWPFApplication.ViewModel
xmlns：x =http://schemas.microsoft.com/winfx/2006/xaml
Title =MainWindowHeight =350Width =525
>
< window.datacontext>
< ; testns：testviewmodel x：name =_ testViewModelid =1name =Abdulxmlns：testns =＃unknown>
< / testns：testviewmodel>
< /window.datacontext>
< grid>
< Label Content =输入名称HorizontalAlignment =LeftMargin =58， 62,0,0VerticalAlignment =TopName =lblName/>
< textbox horizontalalignment =leftheight =22margin =160,66,0,0 textwrapping =Wra p>
Name =txtNameVerticalAlignment =TopWidth =120Text ={Binding Name，Mode = TwoWay，ValidatesOnDataErrors = True}
/>
<！ - < Button Content =使用一个参数保存HorizontalAlignment =LeftMargin =69,142,0,0VerticalAlignment =TopWidth = 159Name =btnSaveSpecific
Command ={Binding Path = SaveWithOneParamenter}
CommandParameter ={Binding ElementName = txtName，Path = Text}
RenderTransformOrigin = - 1.855,0.516/> - >
< Button Content =使用一个参数保存HorizontalAlignment =LeftMargin =69,142,0 ，0VerticalAlignment =TopWidth =159Name =btnSaveSpecific
Command ={Binding Path = ClickCommandSaveWithOneParamenter}
RenderTransformOrigin = - 1.855， 0.516/>
< Label Content =Enter IdHorizontalAlignment =LeftMargin =58,17,0,0VerticalAlignment =TopName =lblId/>
< textbox text ={Binding Id，Mode = TwoWay，ValidatesOnDataErrors = True}horizontalalignment =Leftheight =22margin =160,20,0,0textwrapping =Wrap> ;
x：Name =txtIdVerticalAlignment =TopWidth =120IsReadOnlyCaretVisible =True/>
< Button Content =参数HorizontalAlignment =LeftMargin =253,142,0,0VerticalAlignment =TopWidth =163Name =btnSaveSpecific2
Command ={Binding Path = ClickCommand}< br $> b $ b />
< datagrid horizontalalignment =Leftmargin =103,188,0,0verticalalignment =Topheight =98width =313 >
IsSynchronizedWithCurrentItem =TrueItemsSource ={Binding Path = PersonNames，Mode = TwoWay，UpdateSourceTrigger = PropertyChanged}
SelectedItem ={Binding SelectedItem，UpdateSourceTrigger = PropertyChanged，Mode = TwoWay}
AutoGenerateColumns =False>
< datagrid.columns>
< datagridtextcolumn header =Employee Idbinding ={Binding Path = Id，UpdateSourceTrigger = PropertyChanged，Mode = TwoWay}/>
< datagridtextcolumn header =员工姓名binding ={Binding Path = Name，UpdateSourceTrigger = PropertyChanged，Mode = TwoWay}/>
< datagridtemplatecolumn header =Statuswidth =100>
< datagridtemplatecolumn.celltemplate>
< datatemplate>
< textblock text ={Binding SelectedStatus.StatusName}>< / textblock>
< / datatemplate>
< /datagridtemplatecolumn.celltemplate>
< datagridtemplatecolumn.celleditingtemplate>
< datatemplate>
< combobox height =22> ItemsSource ={StaticResource ListOfStatuses }
SelectedItem ={Binding SelectedStatus}>< / combobox>
< / datatemplate>
< /datagridtemplatecolumn.celleditingtemplate>
< / datagridtemplatecolumn>
< /datagrid.columns>
< / datagrid>
< Label Content ={Binding SelectedItem.Id}Name =lblSelectedIdHorizontalAlignment =LeftMargin =130,294,0,0VerticalAlignment =Top />
< Label Content ={Binding SelectedItem.Name}Name =lblSelectedNameHorizontalAlignment =LeftMargin =271,294,0,0VerticalAlignment =To p/>
< / textbox>< / textbox>< / grid>
< / window>
然后我有如下的ViewModel
公共类TestViewModel：INotifyPropertyChanged，IDataErrorInfo
{
TestData _testData;
ObservableCollection< status> _listOfStatuses;
// public TestCommand TestCommand {get;组; } $ / $
public SaveWithOneParamenter SaveWithOneParamenter {get;组; } $ / $
私人SavingItemDetailsViewModel _savingItemDetailsViewModel;
公共TestViewModel（）
{
_testData = new TestData（）;
_personNames = new ObservableCollection< testdata>（）;
// _ dictionaryNames = new ObservableCollection< tuple>< int，>> （）;
//this.TestCommand = new TestCommand（this）;
this.SaveWithOneParamenter = new SaveWithOneParamenter（this）;
_savingItemDetailsViewModel = new SavingItemDetailsViewModel（）;
_listOfStatuses = new ObservableCollection< status>（）;
_listOfStatuses.Add（new Status（1，Active））;
_listOfStatuses。添加（新状态（2，InActive））;
_listOfStatuses.Add（新状态（3，已删除））;
}
private int _id;
public int Id
{
得到{return _id; }
设定
{
_id = value; NotifyPropertyChanged（Id）;
}
}
private string _name;
public string Name
{
get {return _name; }
set
{
_name = value;
NotifyPropertyChanged（姓名）;
}
}
私人TestData TestData;
public TestData SelectedItem
{get {return TestData; } set {TestData = value; NotifyPropertyChanged（ 的SelectedItem）; } $
私人状态_status;
公共状态SelectedStatus
{get {return _status; } set {_status = value; NotifyPropertyChanged（ SelectedStatus）; } $
public ObservableCollection< status> ListOfStatuses
{
get {return _listOfStatuses; }
private set {_listOfStatuses = value; NotifyPropertyChanged（ ListOfStatuses）; }
}
ObservableCollection< testdata> _personNames;
public ObservableCollection< testdata> PersonNames
{
get {return _personNames; }
设定
{
_personNames = value; NotifyPropertyChanged（ PersonNames）;
}
}
ObservableCollection< tuple>< int，>> _dictionaryNames;
ObservableCollection< tuple>< int，>> DictionaryNames
{
get {return _dictionaryNames; }
设定
{
_dictionaryNames = value; NotifyPropertyChanged（DictionaryNames）;
}
}
公共事件PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged（string propertyName）
{
PropertyChangedEventHandler handler = PropertyChanged;
if（null！= handler）
{
handler（this，new PropertyChangedEventArgs（propertyName））;
}
}
私人ICommand _clickCommand;
公共ICommand ClickCommandSaveWithTwoParamenters
{
get
{
返回_clickCommand ?? （_clickCommand = new SaveWithTwoParamenters（（）=> AddAnItem（），CanExecute））;
}
}
public ICommand ClickCommandSaveWithOneParamenter
{
get
{
return _clickCommand ?? （_clickCommand = new SaveWithTwoParamenters（（）=> AddAnItem（Name），CanExecute））;
}
}
public bool CanExecute {get {return string.IsNullOrEmpty（Error）; } private set {}}
public void AddAnItem（）
{
SavingItemDetails _savingItemDetails = new SavingItemDetails（）;
_savingItemDetails.DataContext = _savingItemDetailsViewModel;
_savingItemDetailsViewModel.SavingId = Id;
_savingItemDetailsViewModel.SavingName = _name;
_savingItemDetailsViewModel.SaveMassage =Saving Id =+ Id.ToString（）+，Name =+ _name;
_savingItemDetails.ShowDialog（）;
_personNames.Add（new TestData（Id，_ name））;
}
public void AddAnItem（string _name）
{
SavingItemDetails _savingItemDetails = new SavingItemDetails（）;
_savingItemDetails.DataContext = _savingItemDetailsViewModel;
_savingItemDetai lsViewModel.SavingId = Id;
_savingItemDetailsViewModel.SavingName = _name;
_savingItemDetailsViewModel.SaveMassage =Saving Id =+ Id.ToString（）+，Name =+ _name;
_savingItemDetails.ShowDialog（）;
int t;
if（（_personNames == null）|| （_personNames.Count（）< = 0））
t = 1;
else
t =（_ personNames.Count< = 0） ？ 1：_personNames.Max（x => x.Id）+ 1;
_personNames.Add（new TestData（t，_ name））;
// int t;
// if（（_personNames == null）||（_personNames.Count（ ）< = 0））
// t = 1;
//其他
// t =（_ personNames.Count< = 0）？ 1：_personNames.Max（x => x.Id）+ 1;
// SavingItemDetails _savingItemDetails = new SavingItemDetails（）;
//_savingItemDetails.DataContext = _savingItemDetailsViewModel;
//_savingItemDetailsViewModel.SavingId = t;
//_savingItemDetailsViewModel.SavingName = _name;
//_savingItemDetailsViewModel.SaveMassage =Saving Id =+ t.ToString（）+，Name =+ _name;
/ /_savingItemDetails.ShowDialog（）;
//_personNames.Add(new TestData（t，_ name））;
}
公共字符串错误
{
get;
私人套装;
}
公共字符串这个[string columnName]
{
get
{
if（colu mnName ==Id）
{
if（Id == 0）
错误=Id不能为0; < br $>
}
if（columnName ==Name）
{
if（string.IsNullOrEmpty（Name））
错误=名字不能为空;
}
返回错误;
}
}
}
然后我的模型如下
公共类状态：INotifyPropertyChanged，IDataErrorInfo
{
private int _statusId;
私有字符串_statusName;
public int StatusId {get {return _statusId; } set {_statusId = value; NotifyPropertyChanged（ StatusId）; } $
公共字符串StatusName {get {return _statusName; } set {_statusName = value; NotifyPropertyChanged（ StatusName）; } $
public Status（int _statusId，string _statusName）
{
this.StatusId = _statusId;
this.StatusName = _statusName;
}
公共事件PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged（string propertyName）
{
PropertyChangedEventHandler handler = PropertyChanged;
if（null！= handler）
{
handler（this，new PropertyChangedEventArgs（propertyName））;
}
}
公共字符串错误
{
get;
private set; < br $>
}
public string this [string columnName]
{
get
{
if（columnName ==StatusId）
{
if（StatusId == 0）
错误=StatusId不能为0;
}
if（columnName ==StatusName）
{
if（string.IsNullOrEmpty（StatusName））
错误=StatusName不能为空;
}
返回错误;
}
}
}
错误在粗体文本处：ItemsSource ={StaticResource ListOfStatuses}
并且它显示Item ListOfStatuses can不能解决，甚至ListOfStatuses都存在于ViewModel中。有人可以在这方面帮助我。在此先感谢。
我尝试将它放在模型中，该模型与DataData的TestData正确绑定，因为我尝试过，仍然没有解决任何帮助，我非常感激。
我尝试过的事情：
我正在努力尝试不同的组合和搜索以及
Hi All,
I have View as below
<window x:class="TestWPFApplication.MainWindow" xmlns:x="#unknown">
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:testns="clr-namespace:TestWPFApplication.ViewModel"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525"
>
<window.datacontext>
<testns:testviewmodel x:name="_testViewModel" id="1" name="Abdul" xmlns:testns="#unknown">
</testns:testviewmodel>
</window.datacontext>
<grid>
<Label Content="Enter Name" HorizontalAlignment="Left" Margin="58,62,0,0" VerticalAlignment="Top" Name="lblName"/>
<textbox horizontalalignment="Left" height="22" margin="160,66,0,0" textwrapping="Wrap">
Name="txtName" VerticalAlignment="Top" Width="120" Text="{Binding Name, Mode=TwoWay, ValidatesOnDataErrors=True}"
/>
<!--<Button Content="Save with One Parameter" HorizontalAlignment="Left" Margin="69,142,0,0" VerticalAlignment="Top" Width="159" Name="btnSaveSpecific"
Command="{Binding Path=SaveWithOneParamenter}"
CommandParameter="{Binding ElementName=txtName, Path=Text}"
RenderTransformOrigin="-1.855,0.516" />-->
<Button Content="Save with One Parameter" HorizontalAlignment="Left" Margin="69,142,0,0" VerticalAlignment="Top" Width="159" Name="btnSaveSpecific"
Command="{Binding Path=ClickCommandSaveWithOneParamenter}"
RenderTransformOrigin="-1.855,0.516" />
<Label Content="Enter Id" HorizontalAlignment="Left" Margin="58,17,0,0" VerticalAlignment="Top" Name="lblId"/>
<textbox text="{Binding Id, Mode=TwoWay, ValidatesOnDataErrors=True}" horizontalalignment="Left" height="22" margin="160,20,0,0" textwrapping="Wrap">
x:Name="txtId" VerticalAlignment="Top" Width="120" IsReadOnlyCaretVisible="True" />
<Button Content="Save with Tow Parameter" HorizontalAlignment="Left" Margin="253,142,0,0" VerticalAlignment="Top" Width="163" Name="btnSaveSpecific2"
Command="{Binding Path=ClickCommand}"
/>
<datagrid horizontalalignment="Left" margin="103,188,0,0" verticalalignment="Top" height="98" width="313">
IsSynchronizedWithCurrentItem="True" ItemsSource="{Binding Path=PersonNames, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
SelectedItem="{Binding SelectedItem, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"
AutoGenerateColumns="False" >
<datagrid.columns>
<datagridtextcolumn header="Employee Id" binding="{Binding Path=Id, UpdateSourceTrigger=PropertyChanged,Mode =TwoWay}" />
<datagridtextcolumn header="Name of Employee" binding="{Binding Path=Name, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" />
<datagridtemplatecolumn header="Status" width="100">
<datagridtemplatecolumn.celltemplate>
<datatemplate>
<textblock text="{Binding SelectedStatus.StatusName}"></textblock>
</datatemplate>
</datagridtemplatecolumn.celltemplate>
<datagridtemplatecolumn.celleditingtemplate>
<datatemplate>
<combobox height="22">ItemsSource="{StaticResource ListOfStatuses}"
SelectedItem="{Binding SelectedStatus}"></combobox>
</datatemplate>
</datagridtemplatecolumn.celleditingtemplate>
</datagridtemplatecolumn>
</datagrid.columns>
</datagrid>
<Label Content="{Binding SelectedItem.Id}" Name="lblSelectedId" HorizontalAlignment="Left" Margin="130,294,0,0" VerticalAlignment="Top"/>
<Label Content="{Binding SelectedItem.Name}" Name="lblSelectedName" HorizontalAlignment="Left" Margin="271,294,0,0" VerticalAlignment="Top"/>
</textbox></textbox></grid>
</window>
Then I have ViewModel as below
public class TestViewModel : INotifyPropertyChanged, IDataErrorInfo
{
TestData _testData;
ObservableCollection<status> _listOfStatuses;
//public TestCommand TestCommand { get; set; }
public SaveWithOneParamenter SaveWithOneParamenter { get; set; }
private SavingItemDetailsViewModel _savingItemDetailsViewModel;
public TestViewModel()
{
_testData = new TestData();
_personNames = new ObservableCollection<testdata>();
//_dictionaryNames = new ObservableCollection<tuple><int,>>();
//this.TestCommand = new TestCommand(this);
this.SaveWithOneParamenter = new SaveWithOneParamenter(this);
_savingItemDetailsViewModel = new SavingItemDetailsViewModel();
_listOfStatuses = new ObservableCollection<status>();
_listOfStatuses.Add(new Status(1, "Active"));
_listOfStatuses.Add(new Status(2, "InActive"));
_listOfStatuses.Add(new Status(3, "Deleted"));
}
private int _id;
public int Id
{
get { return _id; }
set
{
_id = value; NotifyPropertyChanged("Id");
}
}
private string _name;
public string Name
{
get { return _name; }
set
{
_name = value;
NotifyPropertyChanged("Name");
}
}
private TestData TestData;
public TestData SelectedItem
{ get { return TestData; } set { TestData = value; NotifyPropertyChanged("SelectedItem"); } }
private Status _status;
public Status SelectedStatus
{ get { return _status; } set { _status = value; NotifyPropertyChanged("SelectedStatus"); } }
public ObservableCollection<status> ListOfStatuses
{
get { return _listOfStatuses; }
private set { _listOfStatuses = value; NotifyPropertyChanged("ListOfStatuses"); }
}
ObservableCollection<testdata> _personNames;
public ObservableCollection<testdata> PersonNames
{
get { return _personNames; }
set
{
_personNames = value; NotifyPropertyChanged("PersonNames");
}
}
ObservableCollection<tuple><int,>> _dictionaryNames;
ObservableCollection<tuple><int,>> DictionaryNames
{
get { return _dictionaryNames; }
set
{
_dictionaryNames = value; NotifyPropertyChanged("DictionaryNames");
}
}
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged(string propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (null != handler)
{
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
private ICommand _clickCommand;
public ICommand ClickCommandSaveWithTwoParamenters
{
get
{
return _clickCommand ?? (_clickCommand = new SaveWithTwoParamenters(() => AddAnItem(), CanExecute));
}
}
public ICommand ClickCommandSaveWithOneParamenter
{
get
{
return _clickCommand ?? (_clickCommand = new SaveWithTwoParamenters(() => AddAnItem(Name), CanExecute));
}
}
public bool CanExecute { get { return string.IsNullOrEmpty(Error); } private set { } }
public void AddAnItem()
{
SavingItemDetails _savingItemDetails = new SavingItemDetails();
_savingItemDetails.DataContext = _savingItemDetailsViewModel;
_savingItemDetailsViewModel.SavingId = Id;
_savingItemDetailsViewModel.SavingName = _name;
_savingItemDetailsViewModel.SaveMassage = "Saving Id=" + Id.ToString() + ", Name=" + _name;
_savingItemDetails.ShowDialog();
_personNames.Add(new TestData(Id, _name));
}
public void AddAnItem(string _name)
{
SavingItemDetails _savingItemDetails = new SavingItemDetails();
_savingItemDetails.DataContext = _savingItemDetailsViewModel;
_savingItemDetailsViewModel.SavingId = Id;
_savingItemDetailsViewModel.SavingName = _name;
_savingItemDetailsViewModel.SaveMassage = "Saving Id=" + Id.ToString() + ", Name=" + _name;
_savingItemDetails.ShowDialog();
int t;
if ((_personNames == null) || (_personNames.Count() <= 0))
t = 1;
else
t = (_personNames.Count <= 0) ? 1 : _personNames.Max(x => x.Id) + 1;
_personNames.Add(new TestData(t, _name));
//int t;
//if ((_personNames == null) || (_personNames.Count() <= 0))
// t = 1;
//else
// t = (_personNames.Count <= 0) ? 1 : _personNames.Max(x => x.Id) + 1;
//SavingItemDetails _savingItemDetails = new SavingItemDetails();
//_savingItemDetails.DataContext = _savingItemDetailsViewModel;
//_savingItemDetailsViewModel.SavingId = t;
//_savingItemDetailsViewModel.SavingName = _name;
//_savingItemDetailsViewModel.SaveMassage = "Saving Id=" + t.ToString() + ", Name=" + _name;
//_savingItemDetails.ShowDialog();
//_personNames.Add(new TestData(t, _name));
}
public string Error
{
get;
private set;
}
public string this[string columnName]
{
get
{
if (columnName == "Id")
{
if (Id == 0)
Error = "Id Can not be 0";
}
if (columnName == "Name")
{
if (string.IsNullOrEmpty(Name))
Error = "Name can not be empty";
}
return Error;
}
}
}
Then I have Model as below
public class Status : INotifyPropertyChanged, IDataErrorInfo
{
private int _statusId;
private string _statusName;
public int StatusId { get { return _statusId; } set { _statusId = value; NotifyPropertyChanged("StatusId"); } }
public string StatusName { get { return _statusName; } set { _statusName = value; NotifyPropertyChanged("StatusName"); } }
public Status(int _statusId, string _statusName)
{
this.StatusId = _statusId;
this.StatusName = _statusName;
}
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged(string propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (null != handler)
{
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
public string Error
{
get;
private set;
}
public string this[string columnName]
{
get
{
if (columnName == "StatusId")
{
if (StatusId == 0)
Error = "StatusId Can not be 0";
}
if (columnName == "StatusName")
{
if (string.IsNullOrEmpty(StatusName))
Error = "StatusName can not be empty";
}
return Error;
}
}
}
The error is at the bold text that is: ItemsSource="{StaticResource ListOfStatuses}"
and it says "Item ListOfStatuses could not be resolved", even ListOfStatuses is there in the ViewModel. Can somebody please help me in this regards. Thanks in advance.
I tried by putting it within the Model that's being bound with the DataGrid that's TestData right, in that I tried putting, still not solved any help is much appreciated.
What I have tried:
I am trying my best by putting different combinations and searching as well
推荐答案
尝试在窗口中输入名称（例如WindowName）并更改
Try to give aName(WindowName for example) to your window and change
ItemsSource="{StaticResource ListOfStatuses}"
to
to
ItemsSource="{Binding ElementName=WindowName, Path=ListOfStatuses, Mode=OneWay}"
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