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ObservableCollectionにデータバインドされたComboBoxがあります。内容を並べ替えるまで、すべてがうまくいきました。sortdescriptionを使用してみましたが、ここで問題が発生しています。XAMLを助けてください

<ComboBox Margin="10,0,0,0" FontSize="16" Height="30" Width="200" 
                                        ItemsSource="{Binding Path=NationalityDropDownList}" 
                                        DisplayMemberPath="Description"
                                        SelectedValuePath="Code" 
                                        SelectedIndex="{Binding Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, Path=SelectedIndex}"
                                        SelectedValue="{Binding Path=SelectedNationality, Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" Text="0">
                                <i:Interaction.Triggers>
                                    <i:EventTrigger EventName="SelectionChanged">
                                        <i:InvokeCommandAction Command="{Binding UpdateNationalityCodeCommand}" 
                                                CommandParameter="{Binding Path=SelectedIndex}"/>
                                    </i:EventTrigger>
                                </i:Interaction.Triggers>


CODE BEHIND


/// <summary>
        /// NationalityDropDownList 
        /// </summary>
        private CollectionView nationalityDropDownList;

        /// <summary>
        /// Gets or Sets the NationalityDropDownList
        /// </summary>
        public CollectionView NationalityDropDownList
        {
            get
            {
                SortDescription sd = new SortDescription("Description", ListSortDirection.Ascending);

                nationalityDropDownList.SortDescriptions.Add(sd);

                return nationalityDropDownList;
            }


            set
            {
                if (NationalityDropDownList != value)
                {

                    nationalityDropDownList = value;
                    RaisePropertyChanged(() => NationalityDropDownList);
                }

            }
        }


        /// <summary>
    /// Updates the Nationality Drop Down List information
    /// </summary>
    private void UpdateNationalityDropDownList()
    {
        // TODO: Currently hardcoded for Focus Group
        IList<Nationality> list = new List<Nationality>();
        Nationality nationality = new Nationality();
        // TODO : This code should go through the hibernate Code table to read the list of Nationality.
        IEnumerable<Code> nationalityList = localCodeLibrary.FindAllNationalities();

        nationality.Code = string.Empty;
        nationality.Description = "";
        list.Add(nationality);

        foreach (Code national in nationalityList)
        {
            nationality.Code = national.Id.Code;
            nationality.Description = national.Description;
            list.Add(nationality);
        }
        //nationalityDropDownList.SortDescriptions.Add(new SortDescription(nationality.Description, ListSortDirection.Ascending));
        NationalityDropDownList = new CollectionView(list);

    }
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1 に答える 1

1

Items追加中に行方不明になった場合はSortDescription、これを試してください：

 SortDescription sd = new SortDescription("Description", ListSortDirection.Ascending);
 nationalityDropDownList.Items.SortDescriptions.Add(sd);

Descriptionまたはに基づいてアイテムを並べ替えたいことを確認してくださいContent

于 2013-03-23T04:23:19.060 に答える