[英]c# Fill a listView with data from several Linq queries
我的代码检查多个组合框并通过多个查询优化结果。 当我在组合框中选中“Etablissement”时,listView 会显示该 Etablishment 的代理列表。 这完美地工作。 问题是当我选择两个或更多时,我在代理列表中没有得到任何结果。
每当我检查列表中的一个时,我称之为:
if (_TousAgents != null && _Agents != null)
{
_agents = from agent in _TousAgents //_TousAgents contain a list of all agents indiscriminately
where DateFin >= agent.DebutContrat
&& (agent.FinContrat == null
|| DateDébut <= agent.FinContrat)
select agent;
if (_SelectedStatut != null && !String.IsNullOrEmpty(_SelectedStatut.IDStatut))
_agents = from agent in _agents
where agent.Typecontrat == _SelectedStatut.IDStatut
select agent;
if (_SelectedService != null && !String.IsNullOrEmpty(_SelectedService.ID))
_agents = from agent in _agents
where agent.IDService == _SelectedService.ID
select agent;
if (_SelectedSection != null && !String.IsNullOrEmpty(_SelectedSection.ID))
_agents = from agent in _agents
where agent.IDSection == _SelectedSection.ID
select agent;
if (_SelectedEmploi != null && !String.IsNullOrEmpty(_SelectedEmploi.IDEmploi))
_agents = from agent in _agents
where agent.IDEmploi == _SelectedEmploi.IDEmploi
select agent;
if (_SelectedFiliere != null && !String.IsNullOrEmpty(_SelectedFiliere.ID))
_agents = from agent in _agents
where agent.IDFiliere == _SelectedFiliere.ID
select agent;
foreach (Etablissement etb in EtablissementsUtilisateur)
if (etb.IsSelected == true)
{
_agents = from agent in _agents
where agent.IDEtablissement == etb.IDEtablissement
select agent;
} //I think this is the problem
_Agents.Clear();
foreach (AgentModel ag in _agents.Distinct().OrderBy(a => a.Prenom).OrderBy(a => a.Nom))
{
_Agents.Add(ag);
}
if (_Agents != null && _Agents.Count > 0)
{
if (!String.IsNullOrEmpty(SingleAgentMatricule) && _Agents.SingleOrDefault(ag => ag.Matricule == _SingleAgentMatricule) != null)
{
_Agents.SingleOrDefault(ag => ag.Matricule == _SingleAgentMatricule).IsSelected = true;
}
else
SelectAllAgents = true;
}
RaisePropertyChanged("Agents");
}
WPF方面:
<ComboBox Name="CmbEtabTout"
ItemsSource="{Binding EtablissementsUtilisateur}"
Grid.IsSharedSizeScope="True"
Grid.Column="2"
Grid.ColumnSpan="3"
Grid.Row="2"
Height="25"
Width="250">
<ComboBox.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="30" />
<ColumnDefinition SharedSizeGroup="AgentA" Width="auto" />
<ColumnDefinition Width="5" />
<ColumnDefinition SharedSizeGroup="AgentB" Width="auto" />
</Grid.ColumnDefinitions>
<CheckBox IsChecked="{Binding IsSelected}" Command="{Binding DataContext.UpdateListeAgentMulti, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}}" Grid.Column="0" />
<TextBlock Text="{Binding IdEtablissement}" Grid.Column="1"/>
<TextBlock Text="{Binding Nom}" Grid.Column="3"/>
</Grid>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
<ListView x:Name="LVAgent"
ScrollViewer.HorizontalScrollBarVisibility="Disabled"
ItemsSource="{Binding Agents}" Grid.ColumnSpan="2" Margin="150,0,42,0" Grid.Column="2" Grid.Row="4" Grid.RowSpan="5" >
<ListView.View>
<GridView>
<GridViewColumn>
<GridViewColumn.CellTemplate>
<DataTemplate>
<CheckBox IsChecked="{Binding IsSelected}"
Command="{Binding DataContext.SelectAgentCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Window}}"
CommandParameter="{Binding}"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
<CheckBox IsChecked="{Binding SelectAllAgents}"
IsEnabled="True"/>
</GridViewColumn>
<GridViewColumn Header="Matricule"
Width="110"
DisplayMemberBinding="{Binding Matricule}"/>
<GridViewColumn Header="Nom"
Width="120"
DisplayMemberBinding="{Binding Nom}"/>
<GridViewColumn Header="Prénom"
Width="120"
DisplayMemberBinding="{Binding Prenom}"/>
</GridView>
</ListView.View>
</ListView>
结果示例,带有 1 个检查:
一切正常。
有 2 个或更多:
我想用来自 Demo + Demo2018 的代理填充 ListView;
我认为你的 linq 查询是错误的,因为你每次在 foreach 中循环时都会给它赋值。 也许你需要这样的东西
_agents = _agents.Where(x=> p = EtablissementsUtilisateur.Where(y=> y.IsSelected == true).Contains(x));
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