实现MQTT关联变量的别名问题，实现了，同个变量发给不同的MQTT服务器的名称不同

Data/Entities/DbVariableMqtt.cs

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+using System;
+using SqlSugar;
+
+namespace PMSWPF.Data.Entities;
+
+/// <summary>
+/// 表示变量数据与MQTT服务器之间的关联实体，包含MQTT别名。
+/// </summary>
+[SugarTable("VariableMqtt")]
+public class DbVariableMqtt
+{
+    /// <summary>
+    /// 关联的唯一标识符。
+    /// </summary>
+    [SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
+    public int Id { get; set; }
+
+    /// <summary>
+    /// 关联的变量数据ID。
+    /// </summary>
+    public int VariableDataId { get; set; }
+
+    /// <summary>
+    /// 关联的MQTT服务器ID。
+    /// </summary>
+    public int MqttId { get; set; }
+
+    /// <summary>
+    /// 变量在该MQTT服务器上的别名。
+    /// </summary>
+    public string MqttAlias { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 创建时间。
+    /// </summary>
+    public DateTime CreateTime { get; set; } = DateTime.Now;
+
+    /// <summary>
+    /// 更新时间。
+    /// </summary>
+    public DateTime UpdateTime { get; set; } = DateTime.Now;
+
+    /// <summary>
+    /// 导航属性：关联的变量数据。
+    /// </summary>
+    [Navigate(NavigateType.ManyToOne, nameof(VariableDataId))]
+    public DbVariableData? VariableData { get; set; }
+
+    /// <summary>
+    /// 导航属性：关联的MQTT服务器。
+    /// </summary>
+    [Navigate(NavigateType.ManyToOne, nameof(MqttId))]
+    public DbMqtt? Mqtt { get; set; }
+}

Data/Repositories/VariableMqttAliasRepository.cs

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+using PMSWPF.Data.Entities;
+using SqlSugar;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace PMSWPF.Data.Repositories;
+
+/// <summary>
+/// 变量与MQTT服务器别名关联的数据仓库。
+/// </summary>
+public class VariableMqttAliasRepository
+{
+    /// <summary>
+    /// 根据变量ID和MQTT服务器ID获取别名。
+    /// </summary>
+    /// <param name="variableDataId">变量数据ID。</param>
+    /// <param name="mqttId">MQTT服务器ID。</param>
+    /// <returns>DbVariableMqtt实体，如果不存在则为null。</returns>
+    public async Task<DbVariableMqtt?> GetAliasByVariableAndMqtt(int variableDataId, int mqttId)
+    {
+        using (var db = DbContext.GetInstance())
+        {
+            return await GetAliasByVariableAndMqtt(variableDataId, mqttId, db);
+        }
+    }
+
+    /// <summary>
+    /// 根据变量ID和MQTT服务器ID获取别名。
+    /// </summary>
+    /// <param name="variableDataId">变量数据ID。</param>
+    /// <param name="mqttId">MQTT服务器ID。</param>
+    /// <param name="db">SqlSugarClient实例。</param>
+    /// <returns>DbVariableMqtt实体，如果不存在则为null。</returns>
+    public async Task<DbVariableMqtt?> GetAliasByVariableAndMqtt(int variableDataId, int mqttId, SqlSugarClient db)
+    {
+        return await db.Queryable<DbVariableMqtt>()
+                            .Where(it => it.VariableDataId == variableDataId && it.MqttId == mqttId)
+                            .FirstAsync();
+    }
+
+    /// <summary>
+    /// 批量添加变量与MQTT服务器的关联。
+    /// </summary>
+    /// <param name="entities">要添加的DbVariableMqtt实体列表。</param>
+    /// <returns>成功添加的数量。</returns>
+    public async Task<int> AddManyAsync(IEnumerable<DbVariableMqtt> entities)
+    {
+        using (var db = DbContext.GetInstance())
+        {
+            return await AddManyAsync(entities, db);
+        }
+    }
+
+    /// <summary>
+    /// 批量添加变量与MQTT服务器的关联。
+    /// </summary>
+    /// <param name="entities">要添加的DbVariableMqtt实体列表。</param>
+    /// <param name="db">SqlSugarClient实例。</param>
+    /// <returns>成功添加的数量。</returns>
+    public async Task<int> AddManyAsync(IEnumerable<DbVariableMqtt> entities, SqlSugarClient db)
+    {
+        return await db.Insertable<DbVariableMqtt>(entities).ExecuteCommandAsync();
+    }
+
+    /// <summary>
+    /// 更新变量与MQTT服务器的别名。
+    /// </summary>
+    /// <param name="variableDataId">变量数据ID。</param>
+    /// <param name="mqttId">MQTT服务器ID。</param>
+    /// <param name="newAlias">新的别名。</param>
+    /// <returns>受影响的行数。</returns>
+    public async Task<int> UpdateAliasAsync(int variableDataId, int mqttId, string newAlias)
+    {
+        using (var db = DbContext.GetInstance())
+        {
+            return await UpdateAliasAsync(variableDataId, mqttId, newAlias, db);
+        }
+    }
+
+    /// <summary>
+    /// 更新变量与MQTT服务器的别名。
+    /// </summary>
+    /// <param name="variableDataId">变量数据ID。</param>
+    /// <param name="mqttId">MQTT服务器ID。</param>
+    /// <param name="newAlias">新的别名。</param>
+    /// <param name="db">SqlSugarClient实例。</param>
+    /// <returns>受影响的行数。</returns>
+    public async Task<int> UpdateAliasAsync(int variableDataId, int mqttId, string newAlias, SqlSugarClient db)
+    {
+        return await db.Updateable<DbVariableMqtt>()
+                            .SetColumns(it => it.MqttAlias == newAlias)
+                            .Where(it => it.VariableDataId == variableDataId && it.MqttId == mqttId)
+                            .ExecuteCommandAsync();
+    }
+
+    /// <summary>
+    /// 删除变量与MQTT服务器的关联。
+    /// </summary>
+    /// <param name="variableDataId">变量数据ID。</param>
+    /// <param name="mqttId">MQTT服务器ID。</param>
+    /// <returns>受影响的行数。</returns>
+    public async Task<int> DeleteAsync(int variableDataId, int mqttId)
+    {
+        using (var db = DbContext.GetInstance())
+        {
+            return await DeleteAsync(variableDataId, mqttId, db);
+        }
+    }
+
+    /// <summary>
+    /// 删除变量与MQTT服务器的关联。
+    /// </summary>
+    /// <param name="variableDataId">变量数据ID。</param>
+    /// <param name="mqttId">MQTT服务器ID。</param>
+    /// <param name="db">SqlSugarClient实例。</param>
+    /// <returns>受影响的行数。</returns>
+    public async Task<int> DeleteAsync(int variableDataId, int mqttId, SqlSugarClient db)
+    {
+        return await db.Deleteable<DbVariableMqtt>()
+                            .Where(it => it.VariableDataId == variableDataId && it.MqttId == mqttId)
+                            .ExecuteCommandAsync();
+    }
+}

Models/VariableMqtt.cs

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+using System;
+using CommunityToolkit.Mvvm.ComponentModel;
+using PMSWPF.Data.Entities;
+using PMSWPF.Enums;
+
+namespace PMSWPF.Models;
+
+/// <summary>
+/// 表示变量数据与MQTT服务器之间的关联模型，包含MQTT别名。
+/// </summary>
+public partial class VariableMqtt : ObservableObject
+{
+    public VariableMqtt()
+    {
+    }
+
+    public VariableMqtt(VariableData? variableData, Mqtt? mqtt)
+    {
+        VariableData = variableData;
+        Mqtt = mqtt;
+        MqttAlias = MqttAlias != String.Empty ? MqttAlias : variableData.Name;
+    }
+
+    /// <summary>
+    /// 关联的唯一标识符。
+    /// </summary>
+    public int Id { get; set; }
+
+    /// <summary>
+    /// 关联的变量数据ID。
+    /// </summary>
+    public int VariableDataId { get; set; }
+
+    /// <summary>
+    /// 关联的MQTT服务器ID。
+    /// </summary>
+    public int MqttId { get; set; }
+
+    /// <summary>
+    /// 变量在该MQTT服务器上的别名。
+    /// </summary>
+    [ObservableProperty]
+    private string _mqttAlias = string.Empty;
+
+    /// <summary>
+    /// 变量的唯一标识符（S7地址或OPC UA NodeId）。
+    /// </summary>
+    public string Identifier
+    {
+        get
+        {
+            if (VariableData.ProtocolType == ProtocolType.S7)
+            {
+                return VariableData.S7Address;
+            }
+            else if (VariableData.ProtocolType == ProtocolType.OpcUA)
+            {
+                return VariableData.OpcUaNodeId;
+            }
+
+            return string.Empty;
+        }
+    }
+
+    /// <summary>
+    /// 创建时间。
+    /// </summary>
+    public DateTime CreateTime { get; set; } = DateTime.Now;
+
+    /// <summary>
+    /// 更新时间。
+    /// </summary>
+    public DateTime UpdateTime { get; set; } = DateTime.Now;
+
+    /// <summary>
+    /// 导航属性：关联的变量数据。
+    /// </summary>
+    public VariableData? VariableData { get; set; }
+
+    /// <summary>
+    /// 导航属性：关联的MQTT服务器。
+    /// </summary>
+    public Mqtt? Mqtt { get; set; }
+}

ViewModels/Dialogs/MqttAliasBatchEditDialogViewModel.cs

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+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using PMSWPF.Models;
+using System.Collections.ObjectModel;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace PMSWPF.ViewModels.Dialogs;
+
+public partial class MqttAliasBatchEditDialogViewModel : ObservableObject
+{
+    [ObservableProperty]
+    private string _title = "批量设置MQTT别名";
+
+    [ObservableProperty]
+    private ObservableCollection<VariableMqtt> _variablesToEdit;
+
+    public Mqtt SelectedMqtt { get; private set; }
+
+    public MqttAliasBatchEditDialogViewModel(List<VariableData> selectedVariables, Mqtt selectedMqtt)
+    {
+        SelectedMqtt = selectedMqtt;
+        Title=$"设置：{SelectedMqtt.Name}-MQTT服务器关联变量的别名";
+        VariablesToEdit = new ObservableCollection<VariableMqtt>(
+            selectedVariables.Select(v => new VariableMqtt(v, selectedMqtt))
+        );
+    }
+
+    public MqttAliasBatchEditDialogViewModel()
+    {
+        // For design time
+        VariablesToEdit = new ObservableCollection<VariableMqtt>();
+    }
+}

ViewModels/Dialogs/MqttAliasDialogViewModel.cs

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+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+
+namespace PMSWPF.ViewModels.Dialogs;
+
+public partial class MqttAliasDialogViewModel : ObservableObject
+{
+    [ObservableProperty]
+    private string _title = "设置MQTT别名";
+
+    [ObservableProperty]
+    private string _message = "请输入变量在该MQTT服务器上的别名：";
+
+    [ObservableProperty]
+    private string _variableName = string.Empty;
+
+    [ObservableProperty]
+    private string _mqttServerName = string.Empty;
+
+    [ObservableProperty]
+    private string _mqttAlias = string.Empty;
+
+    public MqttAliasDialogViewModel(string variableName, string mqttServerName)
+    {
+        VariableName = variableName;
+        MqttServerName = mqttServerName;
+        Message = $"请输入变量 '{VariableName}' 在MQTT服务器 '{MqttServerName}' 上的别名：";
+    }
+
+    public MqttAliasDialogViewModel()
+    {
+        
+    }
+}

Views/Dialogs/MqttAliasBatchEditDialog.xaml

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+<ui:ContentDialog
+    x:Class="PMSWPF.Views.Dialogs.MqttAliasBatchEditDialog"
+    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:hc="https://handyorg.github.io/handycontrol"
+    xmlns:ui="http://schemas.inkore.net/lib/ui/wpf/modern"
+    xmlns:vm="clr-namespace:PMSWPF.ViewModels.Dialogs"
+    xmlns:models="clr-namespace:PMSWPF.Models"
+    mc:Ignorable="d"
+    d:DataContext="{d:DesignInstance vm:MqttAliasBatchEditDialogViewModel}"
+    Title="{Binding Title}"
+    PrimaryButtonText="确定"
+    CloseButtonText="取消"
+    >
+    <StackPanel Margin="10">
+        <TextBlock TextWrapping="WrapWithOverflow" Margin="5 10" FontSize="13" Foreground="#666">设置的别名，当变量向MQTT服务器发送数据时就会按照设置设置好的别名发送，请在MQTT服务端，按照设置的名称接受。</TextBlock>
+        <DataGrid ItemsSource="{Binding VariablesToEdit}"
+                  AutoGenerateColumns="False"
+                  CanUserAddRows="False"
+                  CanUserDeleteRows="False"
+                  IsReadOnly="False">
+            <DataGrid.Columns>
+                <DataGridTextColumn Header="变量名称" Binding="{Binding VariableData.Name}" IsReadOnly="True" Width="*"/>
+                <DataGridTextColumn Header="标识符" Binding="{Binding Identifier}" IsReadOnly="True" Width="*"/>
+                <DataGridTemplateColumn Header="MQTT别名" Width="*">
+                    <DataGridTemplateColumn.CellTemplate>
+                        <DataTemplate>
+                            <hc:TextBox Text="{Binding MqttAlias, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
+                                        hc:InfoElement.Placeholder="请输入别名"/>
+                        </DataTemplate>
+                    </DataGridTemplateColumn.CellTemplate>
+                </DataGridTemplateColumn>
+            </DataGrid.Columns>
+        </DataGrid>
+    </StackPanel>
+</ui:ContentDialog>

Views/Dialogs/MqttAliasBatchEditDialog.xaml.cs

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+using iNKORE.UI.WPF.Modern.Controls;
+using PMSWPF.ViewModels.Dialogs;
+
+namespace PMSWPF.Views.Dialogs;
+
+public partial class MqttAliasBatchEditDialog : ContentDialog
+{
+    public MqttAliasBatchEditDialog(MqttAliasBatchEditDialogViewModel viewModel)
+    {
+        InitializeComponent();
+        DataContext = viewModel;
+    }
+}

Views/Dialogs/MqttAliasDialog.xaml

@@ -0,0 +1,23 @@
+<ui:ContentDialog
+    x:Class="PMSWPF.Views.Dialogs.MqttAliasDialog"
+    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:ui="http://schemas.inkore.net/lib/ui/wpf/modern"
+    xmlns:hc="https://handyorg.github.io/handycontrol"
+    xmlns:vm="clr-namespace:PMSWPF.ViewModels.Dialogs"
+    mc:Ignorable="d"
+    d:DataContext="{d:DesignInstance vm:MqttAliasDialogViewModel}"
+    Title="{Binding Title}"
+    PrimaryButtonText="确定"
+    CloseButtonText="取消">
+    <Grid>
+        <StackPanel Orientation="Vertical">
+            <TextBlock Text="{Binding Message}" Margin="0,0,0,10" TextWrapping="Wrap"/>
+            <hc:TextBox Text="{Binding MqttAlias, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" 
+                        hc:InfoElement.Title="MQTT别名" 
+                        hc:InfoElement.Placeholder="请输入别名"/>
+        </StackPanel>
+    </Grid>
+</ui:ContentDialog>

Views/Dialogs/MqttAliasDialog.xaml.cs

@@ -0,0 +1,13 @@
+using iNKORE.UI.WPF.Modern.Controls;
+using PMSWPF.ViewModels.Dialogs;
+
+namespace PMSWPF.Views.Dialogs;
+
+public partial class MqttAliasDialog : ContentDialog
+{
+    public MqttAliasDialog(MqttAliasDialogViewModel viewModel)
+    {
+        InitializeComponent();
+        DataContext = viewModel;
+    }
+}