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SearchCompleteController.cs

using Microsoft.AspNetCore.Mvc;
using Nop.Core;
using Nop.Services.Catalog;
using Nop.Services.Security;

namespace Nop.Web.Areas.Admin.Controllers;

public partial class SearchCompleteController : BaseAdminController
{
    #region Fields

    protected readonly IPermissionService _permissionService;
    protected readonly IProductService _productService;
    protected readonly IWorkContext _workContext;

    #endregion

    #region Ctor

    public SearchCompleteController(
        IPermissionService permissionService,
        IProductService productService,
        IWorkContext workContext)
    {
        _permissionService = permissionService;
        _productService = productService;
        _workContext = workContext;
    }

    #endregion

    #region Methods

    public virtual async Task SearchAutoComplete(string term)
    {
        if (!await _permissionService.AuthorizeAsync(StandardPermissionProvider.AccessAdminPanel))
            return Content(string.Empty);

        const int searchTermMinimumLength = 3;
        if (string.IsNullOrWhiteSpace(term) || term.Length < searchTermMinimumLength)
            return Content(string.Empty);

        //a vendor should have access only to his products
        var currentVendor = await _workContext.GetCurrentVendorAsync();
        var vendorId = 0;
        if (currentVendor != null)
        {
            vendorId = currentVendor.Id;
        }

        //products
        const int productNumber = 15;
        var products = await _productService.SearchProductsAsync(0,
            vendorId: vendorId,
            keywords: term,
            pageSize: productNumber,
            showHidden: true);

        var result = (from p in products
            select new
            {
                label = p.Name,
                productid = p.Id
            }).ToList();

        return Json(result);
    }

    #endregion
}