从文本框使用MVVM正确的DataGrid搜索在WPF [英] Proper DataGrid search from TextBox in WPF using MVVM
问题描述
我是新来的MVVM模式，以及何时使用的背后code有点困惑。我有一个非常简单的形式，现在，它包括一个TextBox和一个DataGrid。我想是能够有改变的DataGrid基于文本框的选项。
I am new to the MVVM pattern, and a little confused on when to use Code Behind. I have a very simple form right now, that includes one TextBox, and one DataGrid. What I would like is to be able to have the DataGrid change its selected item based on the TextBox.
我在code背后做到了这一点，它使用以下code正常工作：
I have done this in Code Behind and it works fine using the following code:
private void textBox1_TextChanged(object sender, TextChangedEventArgs e)
{
for (int i = 0; i < dataGrid1.Items.Count; i++)
{
string cellContent = dtReferral.Rows[i][0].ToString();
try
{
if (cellContent != null && cellContent.Substring(0, textBox1.Text.Length).Equals(textBox1.Text))
{
object item = dataGrid1.Items[i];
dataGrid1.SelectedItem = item;
dataGrid1.ScrollIntoView(item);
//row.MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));
break;
}
}
catch { }
}
}
现在，我只想强调在与文本框的文本开始DataGrid中的项目，并允许用户以preSS一个按钮来编辑选择的项目。
Now, I just want to highlight the Item in the Datagrid that starts with text in textbox, and allow the user to press a button to edit selected item.
什么情况下可以在其code文件背后，这个逻辑？或者，我需要通过某种结合做到这一点？如果我应该绑定做到这一点通过视图模型，任何方向将是AP preciated。谢谢你。
Is it okay to have this logic in the Code Behind file? Or would I need to do this through some sort of binding? If I should do this through the View Model with Binding, any direction would be appreciated. Thank you.
推荐答案
如果您只想强调从文本框的文本的单元格你可以把一个 AttatchedProperty 为的DataGrid 来接受来自文本框的搜索值和创建另一个 AttatchedProperty 为细胞来指示匹配，你可以USEE在 IMultiValueConverter 来检查细胞值，以搜索文本。
If you only want to highlight the cells with the text from the TextBox you could make an AttatchedProperty for the DataGrid to accept your search value from the TextBox and create another AttatchedProperty for the Cell to indicate a match that you can usee to set properties in the Cell style. Then we create a IMultiValueConverter to check the Cell value for a match to the search Text.
这样的可重复使用在其他项目上，你只需要在 AttachedProperties 和转换
This way its reusable on other projects as you only need the AttachedProperties and Converter
绑定 AttachedProperty SearchValue 你的文本框 文本属性。
<DataGrid local:DataGridTextSearch.SearchValue="{Binding ElementName=SearchBox, Path=Text, UpdateSourceTrigger=PropertyChanged}"
然后创建一个风格为 DataGridCell 并为 AttachedProperty IsTextMatch 使用 IMultiValueConverter 来返回，如果单元格文本相匹配的 SearchValue
Then create a Style for DataGridCell and create a Setter for the AttachedProperty IsTextMatch using the IMultiValueConverter to return if the cells text matches the SearchValue
<Setter Property="local:DataGridTextSearch.IsTextMatch">
<Setter.Value>
<MultiBinding Converter="{StaticResource SearchValueConverter}">
<Binding RelativeSource="{RelativeSource Self}" Path="Content.Text" />
<Binding RelativeSource="{RelativeSource Self}" Path="(local:DataGridTextSearch.SearchValue)" />
</MultiBinding>
</Setter.Value>
</Setter>
然后我们可以使用单元附 IsTextMatch 属性使用设置高亮显示触发
Then we can use the Cells attached IsTextMatch property to set a highlight using a Trigger
<Style.Triggers>
<Trigger Property="local:DataGridTextSearch.IsTextMatch" Value="True">
<Setter Property="Background" Value="Orange" />
</Trigger>
</Style.Triggers>
下面是一个工作示例显示我的rambilings：）
code：
namespace WpfApplication17
{
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
for (int i = 0; i < 20; i++)
{
TestData.Add(new TestClass { MyProperty = GetRandomText(), MyProperty2 = GetRandomText(), MyProperty3 = GetRandomText() });
}
}
private string GetRandomText()
{
return System.IO.Path.GetFileNameWithoutExtension(System.IO.Path.GetRandomFileName());
}
private ObservableCollection<TestClass> _testData = new ObservableCollection<TestClass>();
public ObservableCollection<TestClass> TestData
{
get { return _testData; }
set { _testData = value; }
}
}
public class TestClass
{
public string MyProperty { get; set; }
public string MyProperty2 { get; set; }
public string MyProperty3 { get; set; }
}
public static class DataGridTextSearch
{
// Using a DependencyProperty as the backing store for SearchValue. This enables animation, styling, binding, etc...
public static readonly DependencyProperty SearchValueProperty =
DependencyProperty.RegisterAttached("SearchValue", typeof(string), typeof(DataGridTextSearch),
new FrameworkPropertyMetadata(string.Empty, FrameworkPropertyMetadataOptions.Inherits));
public static string GetSearchValue(DependencyObject obj)
{
return (string)obj.GetValue(SearchValueProperty);
}
public static void SetSearchValue(DependencyObject obj, string value)
{
obj.SetValue(SearchValueProperty, value);
}
// Using a DependencyProperty as the backing store for IsTextMatch. This enables animation, styling, binding, etc...
public static readonly DependencyProperty IsTextMatchProperty =
DependencyProperty.RegisterAttached("IsTextMatch", typeof(bool), typeof(DataGridTextSearch), new UIPropertyMetadata(false));
public static bool GetIsTextMatch(DependencyObject obj)
{
return (bool)obj.GetValue(IsTextMatchProperty);
}
public static void SetIsTextMatch(DependencyObject obj, bool value)
{
obj.SetValue(IsTextMatchProperty, value);
}
}
public class SearchValueConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
string cellText = values[0] == null ? string.Empty : values[0].ToString();
string searchText = values[1] as string;
if (!string.IsNullOrEmpty(searchText) && !string.IsNullOrEmpty(cellText))
{
return cellText.ToLower().StartsWith(searchText.ToLower());
}
return false;
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)
{
return null;
}
}
}
XAML中：
<Window x:Class="WpfApplication17.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfApplication17"
Title="MainWindow" Height="350" Width="525" Name="UI">
<StackPanel DataContext="{Binding ElementName=UI}">
<TextBox Name="SearchBox" />
<DataGrid x:Name="grid" local:DataGridTextSearch.SearchValue="{Binding ElementName=SearchBox, Path=Text, UpdateSourceTrigger=PropertyChanged}"
ItemsSource="{Binding TestData}" >
<DataGrid.Resources>
<local:SearchValueConverter x:Key="SearchValueConverter" />
<Style TargetType="{x:Type DataGridCell}">
<Setter Property="local:DataGridTextSearch.IsTextMatch">
<Setter.Value>
<MultiBinding Converter="{StaticResource SearchValueConverter}">
<Binding RelativeSource="{RelativeSource Self}" Path="Content.Text" />
<Binding RelativeSource="{RelativeSource Self}" Path="(local:DataGridTextSearch.SearchValue)" />
</MultiBinding>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="local:DataGridTextSearch.IsTextMatch" Value="True">
<Setter Property="Background" Value="Orange" />
</Trigger>
</Style.Triggers>
</Style>
</DataGrid.Resources>
</DataGrid>
</StackPanel>
</Window>
结果：
如果你只是想选择基于单个列，您可以修改此行很容易。）
If you just want to select the row based on a single Column you can modify quite easily :).
覆盖的风格 DataGridRow 而不是 DataGridCell 。
<Style TargetType="{x:Type DataGridRow}">
第一遍你想要到该属性的 IMultiValueConverter 这应该是你的的DataContext
<MultiBinding Converter="{StaticResource SearchValueConverter}">
<Binding RelativeSource="{RelativeSource Self}" Path="DataContext.MyProperty" />
<Binding RelativeSource="{RelativeSource Self}" Path="(local:DataGridTextSearch.SearchValue)" />
</MultiBinding>
然后修改触发设置 IsSelected 在行
<Style.Triggers>
<Trigger Property="local:DataGridTextSearch.IsTextMatch" Value="True">
<Setter Property="IsSelected" Value="True" />
</Trigger>
</Style.Triggers>
应该是这样的：
<DataGrid x:Name="grid" local:DataGridTextSearch.SearchValue="{Binding ElementName=SearchBox, Path=Text, UpdateSourceTrigger=PropertyChanged}"
ItemsSource="{Binding TestData}" >
<DataGrid.Resources>
<local:SearchValueConverter x:Key="SearchValueConverter" />
<Style TargetType="{x:Type DataGridRow}">
<Setter Property="local:DataGridTextSearch.IsTextMatch">
<Setter.Value>
<MultiBinding Converter="{StaticResource SearchValueConverter}">
<Binding RelativeSource="{RelativeSource Self}" Path="DataContext.MyProperty" />
<Binding RelativeSource="{RelativeSource Self}" Path="(local:DataGridTextSearch.SearchValue)" />
</MultiBinding>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="local:DataGridTextSearch.IsTextMatch" Value="True">
<Setter Property="IsSelected" Value="True" />
</Trigger>
</Style.Triggers>
</Style>
</DataGrid.Resources>
</DataGrid>
结果：
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