Question

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

模型如下

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;
                _isDirty = true;
                _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

_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();
    }
}

xaml如下：

<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>

在viewmodel中，我有一个列表_lstTaxonomyFileds，我正在使用它填充模型中的TaxonomyList。该列表包含三个项目“AB”，“BC”和“CD”。现在，用户将第一行添加到网格中并在组合框中包含所有三个选项并选择“AB”现在添加另一行，现在在组合框中只有“BC”和“CD”，直到他从中取消选择“AB”第一行。

Answer 1

不是一个理想的解决方案，但不知何故，我能够使它工作。移动了MetadataConfiguration类中的TaxonomyField属性，做了一些linq魔术并将其绑定到itemsource。

从datagridview中的组合框中删除已选择的值

1 个答案: