更新列表视图,修改所选项目

时间:2017-12-08 07:50:01

标签: c# listview observablecollection

对不起,如果我没有提出好问题,但不知道如何更好地命名......

我有一个带有一些ListView的项目,绑定到ObservableCollection。 当我右键单击ListView,更改名称或其他参数时,ListView不会自动刷新,直到我外出,然后再次打开。

这是我背后的代码:

public class Contexte : INotifyPropertyChanged
    {
        private Affaire affaireSelectionnee;
        public Affaire AffaireSelectionnee
        {
            get { return affaireSelectionnee; }
            set
            {
                if (value == affaireSelectionnee) return;
                affaireSelectionnee = value;
                NotifyPropertyChanged("AffaireSelectionnee");
            }
        }

        private ObservableCollection<Affaire> listeDesAffairesSelectionnees;
        public ObservableCollection<Affaire> ListeDesAffairesSelectionnees
        {
            get { return listeDesAffairesSelectionnees; }
            set { NotifyPropertyChanged(ref listeDesAffairesSelectionnees, value); }
        }
        private ObservableCollection<Phase> listeDesPhasesSelectionnees;
        public ObservableCollection<Phase> ListeDesPhasesSelectionnees
        {
            get { return listeDesPhasesSelectionnees; }
            set { NotifyPropertyChanged(ref listeDesPhasesSelectionnees, value); }
        }
        private ObservableCollection<Assemblage> listeDesAssemblagesSelectionnees;
        public ObservableCollection<Assemblage> ListeDesAssemblagesSelectionnees
        {
            get { return listeDesAssemblagesSelectionnees; }
            set { NotifyPropertyChanged(ref listeDesAssemblagesSelectionnees, value); }
        }
        private ObservableCollection<Repere> listeDesReperesSelectionnees;
        public ObservableCollection<Repere> ListeDesReperesSelectionnees
        {
            get { return listeDesReperesSelectionnees; }
            set { NotifyPropertyChanged(ref listeDesReperesSelectionnees, value); }
        }

        private ObservableCollection<Affaire> listeDesAffaires;
        public ObservableCollection<Affaire> ListeDesAffaires
        {
            get { return listeDesAffaires; }
            set { NotifyPropertyChanged(ref listeDesAffaires, value); }
        }
        private ObservableCollection<Phase> listeDesPhases;
        public ObservableCollection<Phase> ListeDesPhases
        {
            get { return listeDesPhases; }
            set { NotifyPropertyChanged(ref listeDesPhases, value); }
        }
        private ObservableCollection<Assemblage> listeDesAssemblages;
        public ObservableCollection<Assemblage> ListeDesAssemblages
        {
            get { return listeDesAssemblages; }
            set { NotifyPropertyChanged(ref listeDesAssemblages, value); }
        }
        private ObservableCollection<Repere> listeDesReperes;
        public ObservableCollection<Repere> ListeDesReperes
        {
            get { return listeDesReperes; }
            set { NotifyPropertyChanged(ref listeDesReperes, value); }
        }

        public event PropertyChangedEventHandler PropertyChanged;

        public void NotifyPropertyChanged(string nomPropriete)
        {
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs(nomPropriete));
        }

        private bool NotifyPropertyChanged<T>(ref T variable, T valeur, [CallerMemberName] string nomPropriete = null)
        {
            if (object.Equals(variable, valeur)) return false;

            variable = valeur;
            NotifyPropertyChanged(nomPropriete);
            return true;
        }

    }

我在加载程序时加载了一次上下文:

DBConnect DataBase = new DBConnect();
string requete = "SELECT * FROM affaire ORDER BY ID";
List<Affaire> liste = DataBase.Select_affaire(requete, true);
contexte = new Contexte { ListeDesAffaires = new ObservableCollection<Affaire>(liste), ListeDesPhases = new ObservableCollection<Phase>(), ListeDesAssemblages = new ObservableCollection<Assemblage>(), ListeDesReperes = new ObservableCollection<Repere>(), AffaireSelectionnee = new Affaire(), ListeDesAffairesSelectionnees = new ObservableCollection<Affaire>(liste), ListeDesPhasesSelectionnees = new ObservableCollection<Phase>(), ListeDesAssemblagesSelectionnees = new ObservableCollection<Assemblage>(), ListeDesReperesSelectionnees = new ObservableCollection<Repere>() };
DataContext = contexte;

然后我的函数可以更新属性:

foreach (Phase ph in contexte.ListeDesPhasesSelectionnees)
{
  Phase ph_find = contexte.ListeDesPhases.First(s=>s==ph);
  ph_find.Priorite = new_priorite;
}

ph_find.Priorite已更新,我的Observable Collection&#34; contexte.ListeDesPhases&#34;,但没有在ListView上进行刷新。

编辑:我可以解决添加ListView1.Items.Refresh()的问题... 我不确定这是最正确的方式(不是出价应该自动刷新listview吗?),但现在它可以工作

Edit2

我的XAML代码(阶段的Lis​​tView):

<ListView x:Name="ListView2" ItemsSource="{Binding ListeDesPhases}" Grid.Row="3" Grid.Column="0" Grid.ColumnSpan="4" MouseDoubleClick="ListView_MouseDoubleClick" GridViewColumnHeader.Click="GridViewColumnHeaderClickedHandler" SelectionChanged="ListView_SelectionChanged" >

            <ListView.View>

                <GridView AllowsColumnReorder="true" x:Name="GridView2">
                    <GridViewColumn DisplayMemberBinding="{Binding ID}" Header="ID" Width="50"/>
                    <GridViewColumn DisplayMemberBinding= "{Binding NomPhase}" Header="{x:Static p:Resources.Nom}" Width="200"/>
                    <GridViewColumn DisplayMemberBinding="{Binding IdAffaire}" Header="{x:Static p:Resources.IdAffaire}" Width="100"/>
                    <GridViewColumn DisplayMemberBinding="{Binding CommPhase}" Header="{x:Static p:Resources.Commentaire}" Width="100"/>
                    <GridViewColumn DisplayMemberBinding="{Binding Priorite}" Header="{x:Static p:Resources.Priorite}" Width="100"/>
                </GridView>
            </ListView.View>
        </ListView>

我的阶段课程:

public class Phase
    {
        public string NomPhase { get; set; }
        public long IdAffaire { get; set; }
        public string CommPhase { get; set; }
        public int Priorite { get; set; }
        public long ID { get; set; }
        public List<Assemblage> ListAssemblages { get; set; }
        public Phase()
        {
            this.NomPhase = "";
            this.IdAffaire = 0;
            this.CommPhase = "";
            this.Priorite = 0;
            this.ID = 0;
            this.ListAssemblages = new List<Assemblage>();
        }
        ...
    }

编辑3

尝试按照Netstep的说明进行修改,但仍然相同:

public ObservableCollection<Phase> ListeDesPhases
        {
            get { return listeDesPhases; }
            set { NotifyPropertyChanged(ref listeDesPhases, value);
                NotifyPropertyChanged("Priorite");
            }
        }

编辑4

好吧,我现在明白没有发生任何事情,我读了http://www.wpf-tutorial.com/data-binding/responding-to-changes/这个课程来理解它...... 所以NetStep给出的例子是好的(只是没有理解RaisePropertyChanged(() => Priorite);部分是什么?这是由于使用了mvvmlight.net库吗?

public class Phase : INotifyPropertyChanged
    {
        private string nomPhase;
        public string NomPhase
        {
            get { return this.nomPhase; }
            set
            {
                if (this.nomPhase != value)
                {
                    this.nomPhase = value;
                    this.NotifyPropertyChanged("NomPhase");
                }
            }
        }
        private int priorite;
        public int Priorite
        {
            get { return this.priorite; }
            set
            {
                if (this.priorite != value)
                {
                    this.priorite = value;
                    this.NotifyPropertyChanged("Priorite");
                }
            }
        }
        public event PropertyChangedEventHandler PropertyChanged;

        public void NotifyPropertyChanged(string propName)
        {
            if (this.PropertyChanged != null)
                this.PropertyChanged(this, new PropertyChangedEventArgs(propName));
        }
    ...//all of my other functions
    }

所以这就是我所做的,现在效果很好。

然后我有以下问题:我在4个ListView(合同,转包,阶段和明细)中显示了4个不同的对象。 合同是&#34; Mother Class&#34;,它计算参数,但也包含分包合同列表。分包含包含多个参数和阶段列表,每个阶段包含一些参数,以及详细信息列表。 它们中的每一个都显示在不同的ListView(4 ListView)中。 我可以定义4个不同的ObservableCollection,或者是否有一种方法只为所有&#34;树&#34;定义一个ObservableCollection,然后绑定我的ObservableCollection的参数&gt;?

1 个答案:

答案 0 :(得分:1)

要在UI中正确更新字段,请确保Phase类也实现了INotifyPropertyChanged并调用

Set tokens = callerSubject.getPrivateCredentials();

for (Object o : tokens) {
    if(o instanceof SingleSignonToken) {
        SingleSignonToken ssoToken = (SingleSignonToken)o;
        System.out.println("getName: " + ssoToken.getName()+"<BR>");
        if("LtpaToken".equals(ssoToken.getName())){
            System.out.println("getExpiration: " + ssoToken.getExpiration()+"<BR>");
        }
    }
}

在set访问器中。仅使用ObservableCollection是不够的,它只处理通知添加/删除操作。你是对的 - ListView1.Items.Refresh()在这种情况下是一种解决方法。 希望这会有所帮助,否则请分享阶段类代码和您的xaml代码以获得更清晰的评论/答案。

以下是基于MVVM光库的示例:

<?php
$a = 'C8';
$b = 0xC8;
$c = intval($a, 16);
$b === $c; // true

所有其余代码可以保持不变。您还可以从ViewModelBase

继承Context类