[英]search is not working in ios xamarin.forms
我的應用程序中有一個搜索欄。 搜索代碼如下:
private void search_TextChanged(object sender, TextChangedEventArgs e)
{
if (list_total_reg_std.Count != 0)
{
if (string.IsNullOrEmpty(e.NewTextValue))
{
if (filtered == false)
registeredstdslist.ItemsSource = list_total_reg_std;
else
registeredstdslist.ItemsSource = list_filtered_reg_std;
}
else
{
if (filtered == false)
registeredstdslist.ItemsSource = list_total_reg_std.Where(x => x.name.ToLower().Contains(e.NewTextValue) || x.stdid.ToLower().Contains(e.NewTextValue) || x.edlevel.ToString().ToLower().Contains(e.NewTextValue));
else
registeredstdslist.ItemsSource = list_filtered_reg_std.Where(x => x.name.ToLower().Contains(e.NewTextValue) || x.stdid.ToLower().Contains(e.NewTextValue) || x.edlevel.ToString().ToLower().Contains(e.NewTextValue));
}
}
}
這是我的 xaml:
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="ALNahrainAlphaApp.Accounting"
xmlns:images="clr-namespace:ALNahrainAlphaApp;assembly=ALNahrainAlphaApp">
<ContentPage.ToolbarItems >
<ToolbarItem Order="Secondary"
Text="logout"
Priority="2"
Clicked="ToolbarItem_Clicked"
/>
</ContentPage.ToolbarItems>
<ContentPage.Resources>
<Style TargetType="Grid">
<Setter Property="VisualStateManager.VisualStateGroups">
<VisualStateGroupList>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal" />
<VisualState x:Name="Selected">
<VisualState.Setters>
<Setter Property="BackgroundColor"
Value="#f4f0ec" />
</VisualState.Setters>
</VisualState>
</VisualStateGroup>
</VisualStateGroupList>
</Setter>
</Style>
</ContentPage.Resources>
<ContentPage.Content>
<AbsoluteLayout Padding="0" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">
<StackLayout BackgroundColor="White" AbsoluteLayout.LayoutBounds="0, 0, 1, 1" AbsoluteLayout.LayoutFlags="All">
<StackLayout HorizontalOptions="CenterAndExpand" VerticalOptions="CenterAndExpand" >
<SearchBar HorizontalOptions="FillAndExpand" x:Name="search" TextChanged="search_TextChanged"/>
<RefreshView x:Name="refresh" >
<CollectionView x:Name="registeredstdslist" SelectionChanged="registeredstdslist_SelectionChanged" SelectionMode="Single" >
<CollectionView.Header>
<Grid Padding="2" ColumnSpacing="1" RowSpacing="1">
<Grid.RowDefinitions>
<RowDefinition Height="35"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="0.4*"/>
<ColumnDefinition Width="0.5*"/>
<ColumnDefinition Width="0.5*"/>
<ColumnDefinition Width="0.3*"/>
<ColumnDefinition Width="0.2*"/>
<ColumnDefinition Width="0.3*"/>
</Grid.ColumnDefinitions>
<Label
Grid.Column="0"
Text="StdID"
TextColor="Black"
VerticalOptions="Center"
HorizontalOptions="Center"
LineBreakMode="TailTruncation"
/>
<Label
Grid.Column="1"
Text="Name"
TextColor="Black"
VerticalOptions="Center"
HorizontalOptions="Center"
LineBreakMode="TailTruncation"
/>
<Label
Grid.Column="2"
Text="Reg Date"
TextColor="Black"
VerticalOptions="Center"
HorizontalOptions="Center"
LineBreakMode="TailTruncation"
/>
<Label
Grid.Column="3"
Text="Edlevel"
TextColor="Black"
VerticalOptions="Center"
HorizontalOptions="Center"
LineBreakMode="TailTruncation"
/>
<Label
Grid.Column="4"
Text="Grade"
TextColor="Black"
VerticalOptions="Center"
HorizontalOptions="Center"
LineBreakMode="TailTruncation"
/>
<Label
Grid.Column="5"
Text="Status"
TextColor="Black"
VerticalOptions="Center"
HorizontalOptions="Center"
LineBreakMode="TailTruncation"
/>
</Grid>
</CollectionView.Header>
<CollectionView.ItemTemplate>
<DataTemplate >
<Grid ColumnSpacing="1" RowSpacing="0" Padding="9,0,0,0" >
<Grid.RowDefinitions>
<RowDefinition Height="40"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="0.4*"/>
<ColumnDefinition Width="0.5*"/>
<ColumnDefinition Width="0.5*"/>
<ColumnDefinition Width="0.3*"/>
<ColumnDefinition Width="0.2*"/>
<ColumnDefinition Width="0.3*"/>
</Grid.ColumnDefinitions>
<Label
Grid.Column="0"
Text="{Binding stdid}"
TextColor="Black"
VerticalOptions="Center"
HorizontalOptions="Center"
LineBreakMode="TailTruncation"
FontSize="13"
/>
<Label
Grid.Column="1"
Text="{Binding name}"
TextColor="Black"
VerticalOptions="Center"
HorizontalOptions="Center"
LineBreakMode="TailTruncation"
FontSize="13"
/>
<Label
Grid.Column="2"
Text="{Binding DateofReg}"
TextColor="Black"
VerticalOptions="Center"
HorizontalOptions="Center"
LineBreakMode="TailTruncation"
FontSize="13"
/>
<Label
Grid.Column="3"
Text="{Binding edlevel}"
TextColor="Black"
VerticalOptions="Center"
HorizontalOptions="Center"
LineBreakMode="TailTruncation"
FontSize="13"
/>
<Label
Grid.Column="4"
Text="{Binding grade}"
TextColor="Black"
VerticalOptions="Center"
HorizontalOptions="Center"
LineBreakMode="TailTruncation"
Padding="10"
FontSize="13"
/>
<Image
Grid.Column="5"
VerticalOptions="Center"
HorizontalOptions="Center"
HeightRequest="20"
WidthRequest="20"
>
<Image.Triggers>
<DataTrigger TargetType="Image" Binding="{Binding status}" Value="false" >
<Setter Property="Source" Value="{OnPlatform Android=redtik.png,iOS=redtik.png}"/>
</DataTrigger>
<DataTrigger TargetType="Image" Binding="{Binding status}" Value="true" >
<Setter Property="Source" Value="{OnPlatform Android=greentik.png, iOS=greentik.png}"/>
</DataTrigger>
</Image.Triggers>
</Image>
</Grid>
</DataTemplate>
</CollectionView.ItemTemplate>
</CollectionView>
</RefreshView>
<StackLayout VerticalOptions="EndAndExpand" HorizontalOptions="FillAndExpand" Orientation="Horizontal" BackgroundColor="#0d98ba">
<StackLayout Style="{StaticResource ButtonNavigationBarStackLayoutStyle}" x:Name="stckAddStd">
<Image Margin="0,10,0,5" x:Name="imgAdd" Style="{StaticResource ButtonNavigationBarImageStyle}" />
</StackLayout>
<StackLayout Style="{StaticResource ButtonNavigationBarStackLayoutStyle}" x:Name="stckfilter">
<Image Margin="0,10,0,10" x:Name="imgfilter" Style="{StaticResource ButtonNavigationBarImageStyle}" />
</StackLayout>
<StackLayout Style="{StaticResource ButtonNavigationBarStackLayoutStyle}" x:Name="stckshare">
<Image Margin="0,10,0,10" x:Name="imgshare" Style="{StaticResource ButtonNavigationBarImageStyle}" />
</StackLayout>
</StackLayout>
</StackLayout>
</StackLayout>
<ContentView x:Name="popupLoadingView" BackgroundColor="Transparent" Padding="10, 0" IsVisible="false" AbsoluteLayout.LayoutBounds="0, 0, 1, 1" AbsoluteLayout.LayoutFlags="All">
<StackLayout VerticalOptions="Center" HorizontalOptions="Center">
<StackLayout Orientation="Vertical" HeightRequest="150" WidthRequest="200" BackgroundColor="Transparent">
<ActivityIndicator x:Name="activityIndicator" Margin="0,50,0,0" VerticalOptions="Center" HorizontalOptions="Center" Color="Black" WidthRequest="40" HeightRequest="40" ></ActivityIndicator>
</StackLayout>
</StackLayout>
</ContentView>
</AbsoluteLayout>
</ContentPage.Content>
</ContentPage>
registeredstdslist
是一個集合視圖,其中包含我從數據庫中獲取的有關學生的數據。 該代碼在 android 上運行良好,但在我的 ios 模擬器上,它不起作用。 當我在搜索欄中寫一些東西時,collectionview 沒有顯示任何數據,盡管我寫的東西有一些字母,比如我列表中的一些數據。 當我刪除我寫的內容時,所有數據都會再次顯示。 這是為什么? 我究竟做錯了什么?
更新:我添加了這個:
private void search_TextChanged(object sender, TextChangedEventArgs e)
{
if (list_total_reg_std.Count != 0)
{
if (string.IsNullOrEmpty(e.NewTextValue))
{
if (filtered == false)
registeredstdslist.ItemsSource = list_total_reg_std;
else
registeredstdslist.ItemsSource = list_filtered_reg_std;
}
else
{
if (filtered == false)
if(list_total_reg_std.FindAll(x => x.name.ToLower().Contains(e.NewTextValue)).Count==0)
DisplayAlert("Operation Failed", "No matchiing data!", "Cancel");
// registeredstdslist.ItemsSource = list_total_reg_std.Where(x => x.name.ToLower().Contains(e.NewTextValue) || x.stdid.ToLower().Contains(e.NewTextValue) || x.edlevel.ToString().ToLower().Contains(e.NewTextValue));
else
registeredstdslist.ItemsSource = list_filtered_reg_std.Where(x => x.name.ToLower().Contains(e.NewTextValue) || x.stdid.ToLower().Contains(e.NewTextValue) || x.edlevel.ToString().ToLower().Contains(e.NewTextValue));
}
}
它實際上No matching data
,但為什么呢? 為什么它在 android 上沒有問題而在 ios 上卻沒有?
我看到的一個問題是,如果您鍵入任何大寫字母,它都不會匹配。
x.name.ToLower().Contains(e.NewTextValue)
應該是x.name.ToLower().Contains(e.NewTextValue.ToLower())
。
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