wpf - 当已选择行时，WPF MVVM DataGrid DoubleClick不起作用

Question

所以我有一个与this question相同的问题。
但是，此问题的解决方案似乎是Code-Behind(已有4年历史了)，但我使用的是MVVM。时间可能带来了更好的解决方案。

有谁知道在选中DataGridRow后可以在DataGridRow上进行双击的方法吗？

这是我的XAML:

<DataGrid x:Name="ContactsResult" 
          AlternatingRowBackground="Transparent"
          AutoGenerateColumns="False" 
          BorderBrush="{StaticResource DarkBlueBrush}"
          BorderThickness="1"
          CanUserAddRows="False" 
          FontFamily="{StaticResource DefaultFont}"
          GridLinesVisibility="None"
          HeadersVisibility="Column"
          IsReadOnly="True"
          ItemsSource="{Binding Results, Mode=TwoWay}"
          SelectedItem="{Binding SelectedItem, Mode=TwoWay}" 
          >

          <DataGrid.InputBindings>
              <MouseBinding Gesture="LeftDoubleClick" 
                            Command="{Binding DetailsCommand}"
                            CommandParameter="{Binding ElementName=ContactsResult, Path=SelectedItem.ContactId}"
                            />
          </DataGrid.InputBindings>

          <DataGrid.Columns>
              <DataGridTextColumn x:Name="contactLastNameColumn" 
                                  Binding="{Binding Name_LastSufFirstMidSal}"
                                  ElementStyle="{StaticResource dgCellPadding5}"                      Header="Contact Name" 
                                  Width="Auto" 
                                  />
              <DataGridTextColumn x:Name="companyNameColumn"
                                  ElementStyle="{StaticResource dgCellPadding5}"                      Header="Company Name"
                                  Width="Auto"
                                  />
              <DataGridTextColumn x:Name="CityColumn" 
                                  Binding="{Binding MailingAddress.City}" 
                                  ElementStyle="{StaticResource dgCellPadding5}"                      Header="Mailing City"
                                  Width="Auto"
                                  />
              <DataGridTextColumn x:Name="StateColumn" 
                                  Binding="{Binding MailingAddress.StateOrProvince}"      ElementStyle="{StaticResource dgCellPadding5}"                      Header="Mailing State" 
                                  Width="Auto"
                                  />
          </DataGrid.Columns>
</DataGrid>

编辑

ElementSytle

<Style x:Key="dgCellPadding5" TargetType="{x:Type TextBlock}">
    <Setter Property="Margin" Value="5" />
</Style>

Answer 1

以下针对.NET 4.7.1的示例触发了双击命令(无论选择状态如何)。我已经从上面包含了您引用的样式。您的代码与此不同吗？

<Window x:Class="WpfApp1.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:wpfApp1="clr-namespace:WpfApp1"
    mc:Ignorable="d"
    Title="MainWindow" Height="450" Width="800">
<Window.DataContext>
    <wpfApp1:ViewModel />
</Window.DataContext>
<Window.Resources>
    <Style x:Key="dgCellPadding5" TargetType="{x:Type TextBlock}">
        <Setter Property="Margin" Value="5" />
    </Style>
</Window.Resources>
<DataGrid x:Name="ContactsResult"
          AlternatingRowBackground="Transparent"
          AutoGenerateColumns="False"
          BorderThickness="1"
          CanUserAddRows="False"
          GridLinesVisibility="None"
          HeadersVisibility="Column"
          IsReadOnly="True"
          ItemsSource="{Binding Contacts}"
          SelectedItem="{Binding SelectedContact, Mode=TwoWay}">

    <DataGrid.InputBindings>
        <MouseBinding Gesture="LeftDoubleClick"
                      Command="{Binding Command}"
                      CommandParameter="{Binding ElementName=ContactsResult, Path=SelectedItem}" />
    </DataGrid.InputBindings>

    <DataGrid.Columns>
        <DataGridTextColumn ElementStyle="{StaticResource dgCellPadding5}"
                            Binding="{Binding ContactName}"
                            Header="Contact Name"
                            Width="Auto" />
        <DataGridTextColumn ElementStyle="{StaticResource dgCellPadding5}" Header="Company Name"
                            Binding="{Binding CompanyName}"
                            Width="Auto" />
        <DataGridTextColumn Binding="{Binding City}" Header="Mailing City"
                            Width="Auto" ElementStyle="{StaticResource dgCellPadding5}" />
        <DataGridTextColumn Binding="{Binding State}" Header="Mailing State"
                            Width="Auto" ElementStyle="{StaticResource dgCellPadding5}" />
    </DataGrid.Columns>
</DataGrid>

using System;
using System.Diagnostics;
using System.Windows.Input;
using Prism.Commands;
using Prism.Mvvm;

namespace WpfApp1
{
    public class ViewModel : BindableBase
    {
        public ContactInfo[] Contacts
        {
            get;
        } =
        {
            new ContactInfo
            {
                ContactName = "First",
                CompanyName = "Acme",
                City = "Somewhere",
                State = "CA"
            },
            new ContactInfo
            {
                ContactName = "Second",
                CompanyName = "Acme",
                City = "Somewhere",
                State = "CA"
            },
            new ContactInfo
            {
                ContactName = "Third",
                CompanyName = "Acme",
                City = "Somewhere",
                State = "CA"
            },
            new ContactInfo
            {
                ContactName = "Fourth",
                CompanyName = "Acme",
                City = "Somewhere",
                State = "CA"
            }
        };

        private ContactInfo _selectedContact;

        public ContactInfo SelectedContact
        {
            get => _selectedContact;
            set => SetProperty(ref _selectedContact, value);
        }

        public ICommand Command
        {
            get;
        } = new DelegateCommand<ContactInfo>(ci => Debug.WriteLine($"{ci.ContactName} {DateTime.Now}"));

        public ICommand OtherCommand
        {
            get;
        } = new DelegateCommand<string>(s => Debug.WriteLine($"{s} {DateTime.Now}"));
    }

    public class ContactInfo
    {
        public string ContactName
        {
            get;
            set;
        }

        public string CompanyName
        {
            get; set;
        }

        public string City
        {
            get;
            set;
        }

        public string State
        {
            get;
            set;
        }
    }
}