不会在AddingNewItem事件中调整大小的DataGrid

问题描述

我是新手，真的不知道如何解决这类问题。我确实有一个UserControl，上面是Ribbon，下面是DataGrid。单击用户后，它将以新窗口打开。实际的问题是DataGrid在每个恒定的时间段内进行更新，例如，每隔一秒钟就会更新一次新行，因此，窗口的高度会发生变化以适应内容，并且仅在到达时才停止增长屏幕底部。

XAML文件：

<UserControl x:Class="Aean.Commissioning.Views.JournalingServiceView"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         xmlns:p="clr-namespace:Aean.Commissioning.Properties"
         mc:Ignorable="d"
         d:DesignHeight="450" d:DesignWidth="600"
         Background="White"
         Margin="0,5" x:Name="journalingServiceView">
<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto"/>
        <RowDefinition/>
    </Grid.RowDefinitions>

    <Ribbon x:Name="ribbonPanel" Grid.Row="0"
            Focusable="false" KeyboardNavigation.TabNavigation="None" 
            ContextMenu="{x:Null}" ShowQuickAccessToolBarOnTop="False">

        <Ribbon.ApplicationMenu>
            <RibbonApplicationMenu Visibility="Collapsed"/>
        </Ribbon.ApplicationMenu>

        <RibbonTab x:Name="journalingServiceTab" Tag="JournalingServiceView"
                   ContextMenu="{x:Null}"
                   Header="{x:Static p:Resources.Journals}">
            <RibbonGroup UIElement.Uid="DiscoveryOperations"
                         IsEnabled="{Binding Path=.,Converter={StaticResource ObjectToBoolConverter},FallbackValue=False,TargetNullValue=False}"
                         UseLayoutRounding="True"
                         HeaderedItemsControl.Header="Overview" ContextMenu="{x:Null}">
                <RibbonGroup.GroupSizeDefinitions>
                    <RibbonGroupSizeDefinition>
                        <RibbonControlSizeDefinition ImageSize="Large" IsLabelVisible="true"/>
                        <RibbonControlSizeDefinition ImageSize="Large" IsLabelVisible="true"/>
                    </RibbonGroupSizeDefinition>
                </RibbonGroup.GroupSizeDefinitions>

                <RibbonButton UIElement.Uid=""       Label="{x:Static p:Resources.DownloadConfig}"               
                              Command="{Binding GetJournalsCommand}"
                              LargeImageSource="/assets/download.png"    Style="{StaticResource AeanButtonStyle}" />
            </RibbonGroup>
        </RibbonTab>
    </Ribbon>

    <DataGrid x:Name="journalDataEntries" Grid.Row="1"
              AutoGenerateColumns="False"
              CanUserAddRows="False"
              UseLayoutRounding="True"
              IsReadOnly="True"
              ItemsSource="{Binding JournalDataEntries,Mode=Default,UpdateSourceTrigger=PropertyChanged}">
        <DataGrid.Columns>
            <DataGridTextColumn Header="Time" Binding="{Binding Id}" Width="Auto"/>
            <DataGridTextColumn Header="Group ID" Binding="{Binding GroupId}" Width="80"/>
            <DataGridTextColumn Header="Message Type ID" Binding="{Binding MessageTypeId}" Width="90"/>
            <DataGridTextColumn Header="Object ID" Binding="{Binding ObjectId}" Width="80"/>
        </DataGrid.Columns>
    </DataGrid>
</Grid>

我认为这是不可接受的，我试图通过将DataGrid的高度绑定到窗口的高度（link #1和#2）来解决此问题。效果不好。我无法将尺寸设置为比例，因为它会改变Ribbon的高度，它必须像固定的导航栏，并且不会改变其高度，因此也不是解决方案（{{3 }}，这些答案都无法为我解决。看到link和this的答案后，我尝试将所有信息放入StackPanel内，但问题仍然存在。

最后一个问题是：“是否有可能创建不会在AddingNewItem Event上调整大小并占据窗口其余部分的网格。

如果需要的话，ViewModel的源代码。

using Aean.Commissioning.Infrastructure;
using Aean.Commissioning.Views;
using Aean.Core;
using DynamicData;
using IO.Swagger.Api;
using IO.Swagger.Model;
using NLog;
using ReactiveUI;
using ReactiveUI.Fody.Helpers;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Reactive;
using System.Reactive.Linq;
using System.Threading.Tasks;
using System.Timers;

namespace Aean.Commissioning.ViewModels.Widgets
{
    public class JournalServiceViewModel
    {
    [Browsable(false)]
    public string Id { get; set; }

    public string Timestamp { get; set; }

    public int? GroupId { get; set; }

    public int? MessageTypeId { get; set; }

    public int? ObjectId { get; set; }

    public string Val1 { get; set; }

    public string Val2 { get; set; }

    [Browsable(false)]
    public JournalDataEntry JournalDataEntry => new JournalDataEntry(Id,Timestamp,GroupId,MessageTypeId,ObjectId,Val1,Val2);

    public JournalServiceViewModel() : this(new JournalDataEntry(DefaultId,DefaultTimestamp,DefaultGroupId,DefaultMessageTypeId,DefaultObjectId,DefaultVal1,DefaultVal2))
    {

    }

    public JournalServiceViewModel(JournalDataEntry prototype)
    {
        Refresh(prototype);
    }

    internal void Refresh(JournalDataEntry prototype)
    {
        Id = prototype.Id;
        Timestamp = prototype.Timestamp;
        GroupId = prototype.GroupId;
        MessageTypeId = prototype.MessageTypeId;
        ObjectId = prototype.ObjectId;
        Val1 = prototype.Val1;
        Val2 = prototype.Val2;
    }

    private static string DefaultId => "default";
    private static string DefaultTimestamp => new DateTime(2001,1,DateTimeKind.Utc).ToString();
    private static int? DefaultGroupId => 0;
    private static int? DefaultMessageTypeId => 0;
    private static int? DefaultObjectId => 0;
    private static string DefaultVal1 => "default";
    private static string DefaultVal2 => "default";
    }

    [WidgetManager(typeof(JournalingServiceView))]
    [Description("Сообщения")]
    [Category("Обмен данными")]
    public class JournalingServiceViewModel : CustomDisplayViewModel
    {
    public HistoryApi API { get; private set; }

    private Dictionary<string,bool> IdLookupTable { get; set; } = new Dictionary<string,bool>();

    [Reactive]
    public ObservableCollection<JournalDataEntry> JournalDataEntries { get; set; } = new ObservableCollection<JournalDataEntry>();

    public string LastKnownId { get; set; } = null;

    public JournalingServiceViewModel(INetworkCommunicationService dataService) : base(dataService)
    {
        GetJournalsCommand = ReactiveCommand.CreateFromTask(GetJournalDataEntries);

        GetJournalsCommand.ThrownExceptions.Subscribe(exception =>
        {
            LocalLog(new LogEventInfo(LogLevel.Error,"",exception.ToString()));
        });
    }

    protected override void CollectModels()
    {
        var connector = new ApiConnector(DataService);
        API = new HistoryApi(connector);
        GetJournalDataEntries();
    }

    public override void Refresh(object sender,ElapsedEventArgs e)
    {
        Update();
    }

    private async Task GetJournalDataEntries()
    {
        await Observable.Start(() =>
        {
            try
            {
                Update();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex);
            }
        },RxApp.MainThreadScheduler);
    }

    private async void Update()
    {
        await Observable.Start(async () =>
        {
            try
            {
                var a = await API.GetJournalAsync(LastKnownId);
                a.ForEach(x => {
                    if (!IdLookupTable.ContainsKey(x.Id))
                    {
                        IdLookupTable.Add(x.Id,true);
                        JournalDataEntries.Add(x);
                    }
                });
                LastKnownId = JournalDataEntries.Last().Id;
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex);
            }
        },RxApp.MainThreadScheduler);
    }

    public ReactiveCommand<Unit,Unit> GetJournalsCommand { get; private set; }

    }
}

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

如果你已经找到好的解决方法，欢迎将解决方案带上本链接一起发送给小编。

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