ExcelHelper/Views/ViewModels/MainViewModel.cs

using System.Diagnostics;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using ExcelHelper.Views.Pages;

namespace ExcelHelper.Views.ViewModels;

public partial class MainViewModel : ObservableObject, IViewModel
{

    /// <summary>
    /// 异常信息
    /// </summary>
    [ObservableProperty]
    private string _errorMessage;

    [RelayCommand]
    private void OnSideMenuSelect(string itemTag)
    {
        Trace.WriteLine($"OnSideMenuSelect -> {itemTag}");
        var targetPage = itemTag switch
        {
            "ImportExcelPage" => typeof(ImportExcelPage),
            _ => null
        };
        if (targetPage != null)
        {
            App.AppHost.Get<Services.NavigationService>().NavigateTo(targetPage);
        }
    }

}