从datagridview中的组合框中删除已选择的值 [英] Remove already selected value from a combobox in datagridview

问题描述

我在模板列中有一个wpf datagridview和combobox。我不想显示已为其他行选择的值，但在执行此操作时，当前选中的项目也会被删除。



模型如下< br $> b $ b

Hi,

I have a wpf datagridview and and combobox in the template column. I do not want to show the values already selected for other rows, but in doing this the item that is currently selected also gets removed.

The model is as follows

public class MetadataConfigurationModel : ViewModelBase
    {        
        private ObservableCollection<MetadataConfiguration> _metadataConfiguration = new ObservableCollection<MetadataConfiguration>();
        public ObservableCollection<MetadataConfiguration> MetadataConfig
        {
            get { return _metadataConfiguration; }
            set { _metadataConfiguration = value; }
        }

        private ObservableCollection<TaxonomyField> _taxonomyList = new ObservableCollection<TaxonomyField>();
        public ObservableCollection<TaxonomyField> TaxonomyList
        {
            get
            {
                ObservableCollection<TaxonomyField> tempTaxanomy = new ObservableCollection<TaxonomyField>(_taxonomyList);
                tempTaxanomy.Add(null);
                tempTaxanomy.Move(tempTaxanomy.Count - 1, 0);
                foreach (MetadataConfiguration mdConfig in _metadataConfiguration.ToList())
                {
                    tempTaxanomy.Remove(mdConfig.Field);
                }
                return tempTaxanomy;
            }
            set
            {
                _taxonomyList = value;
            }
        }

        public class MetadataConfiguration : ViewModelBase
        {
           
            private TaxonomyField _field;
            [XmlIgnore]
            public TaxonomyField Field
            {
                get { return _field; }
                set
                {
                    _field = value;
                    _fieldName = _field == null ? String.Empty : _field.Title;
                    _fieldGUID = _field == null ? Guid.Empty : _field.Id;
                    _termsetGUID = _field == null ? Guid.Empty : _field.TermSetId;
                    OnPropertyChanged("Field");
                }
            }

            private string _fieldName;
            public string FieldName
            {
                get { return _fieldName; }
                set { 
                    _fieldName = value;
                    OnPropertyChanged("FieldName");
                }
            }

            private Guid _fieldGUID;
            public Guid FieldGUID
            {
                get { return _fieldGUID; }
                set { _fieldGUID = value;
                OnPropertyChanged("FieldGUID");
                }
            }

            private Guid _termsetGUID;
            public Guid TermsetGUID
            {
                get { return _termsetGUID; }
                set { _termsetGUID = value;
                OnPropertyChanged("TermsetGUID");
                }
            }
        }
    }

ViewModel按如下方式填充列表

The ViewModel populates the list as follows

_model.TaxonomyList = new ObservableCollection<TaxonomyField>(_lstTaxonomyFileds);
            

            if (_model.MetadataConfig.Count > 0)
            {
                foreach (MetadataConfigurationModel.MetadataConfiguration mdConfig in _model.MetadataConfig)
                {
                    mdConfig.Field = (from a in _model.TaxonomyList where a.Id == mdConfig.FieldGUID select a).FirstOrDefault();
                }
            }

和xaml如下

and the xaml is as follows

<DataGrid AutoGenerateColumns="False" x:Name="dgMetadataConfig" Grid.Row="2" Grid.Column="0" ScrollViewer.VerticalScrollBarVisibility="Auto" 

			ItemsSource="{Binding MetadataConfig, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Margin="10,0,0,0" CanUserAddRows="False" VerticalAlignment="Top">
            <DataGrid.Columns>                

                <DataGridTemplateColumn Header="Field Name">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <ComboBox Width="170" SelectedItem="{Binding Field, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"

								ItemsSource="{Binding DataContext.TaxonomyList, Mode=TwoWay, 
                                RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}},
                                UpdateSourceTrigger=PropertyChanged}" 

                                      Margin="2,2,2,2" DropDownOpened="CmbTaxonomyField_DropDownOpened" DisplayMemberPath="Title" SourceUpdated="CmbTaxonomyField_SourceUpdated"/>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
            </DataGrid.Columns>
</DataGrid>

任何帮助将不胜感激。



问候，

Zafar

Any help will be appreciated.

Regards,
Zafar

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