多個參數ASP Net MVC 4

Question

我已經有一個城市參數，代表要在數據庫上搜索的城市名稱，當我執行mysite / List？city = mycityname時，一切工作正常，但是我想做的是我也想做一個按名字搜索和城市名稱示例List？city = mycityname＆firstName = myfirstname。 我怎樣才能做到這一點 ？ 這是我對城市的查詢，我也添加了firstname參數，但是我真的不知道如何添加它，因此它將對這兩個參數進行過濾。

public string CurrentFirstName { get; set; }

public ViewResult List(string city, string firstName, int page = 1)
    {
        UsersListViewModel model = new UsersListViewModel
        {
            Users = repository.Userss
            .Where(p =>city == null || p.CityName == city )
            .OrderBy(p => p.UsersId)
            .Skip((page - 1) * PageSize)
            .Take(PageSize),
            PagingInfo = new PagingInfo
            {
                CurrentPage = page,
                UsersPerPage = PageSize,
                TotalUsers = repository.Userss.Count()
            },
            CurrentCity = city
            // CurrentFirstName = firstName
        };
        return View(model);
    }

Answer 1

你可以這樣寫

Users = repository.Userss
        .Where(p =>city == null || p.CityName == city )
        .Where(p=> firstName == null || p.FirstName == firstName)
        .OrderBy(p => p.UsersId)
     // rest of your query

Answer 2

看下面的代碼：

    public ViewResult List(string city, string firstName, int page = 1)
    {
        UsersListViewModel model = new UsersListViewModel
        {
            Users = repository.Userss
            .Where((p =>city == null || p.CityName == city ) && 
             (p =>firstname == null || p.FirstName == firstName))
            .OrderBy(p => p.UsersId)
            .Skip((page - 1) * PageSize)
            .Take(PageSize),
            PagingInfo = new PagingInfo
            {
                CurrentPage = page,
                UsersPerPage = PageSize,
                TotalUsers = repository.Userss.Count()
            },
            CurrentCity = city
            CurrentFirstName = firstName
        };
        return View(model);
    }

Answer 3

您可以進行一些條件查詢，例如

public ViewResult List(string city, string firstName, int page = 1)
{
    var query = repository.Userss.Where(p => city == null || p.CityName == city);
    if (firstName != null)
        query = query.Where(p => firstName == null || p.FirstName == firstName);

    var model = new UsersListViewModel
    {
        Users = query
        .OrderBy(p => p.UsersId)
        .Skip((page - 1) * PageSize)
        .Take(PageSize),
        PagingInfo = new PagingInfo
        {
            CurrentPage = page,
            UsersPerPage = PageSize,
            TotalUsers = repository.Userss.Count()
        },
        CurrentCity = city
        // CurrentFirstName = firstName
    };
    return View(model);
}

注意：我認為您還應該考慮TotalUsers計算中的搜索條件

希望這可以幫助。