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ASP.NET Core PagingTagHelper TagHelper

ASP.NET Core Tag 辅助工具(1.1部分, 类似... A Flippy Tag 辅助工具)

Monday, 17 March 2025

一. 导言 导言 导言 导言 导言 导言 一,导言 导言 导言 导言 导言 导言

所以在建一个我最初建造的工程项目时 呼叫标签助手 我还在另一条需要上监视 一种在 HtMX 支持下为结果列表建立简单排序功能的方法 。

所以... 我向你们介绍"滑动桌头"牌牌帮手的东西 这只是一篇简短的文章 里面有很多代码 你总是能看见 这里的样本.. 和源代码 一如既往 就是在这里.

我是非常糟糕的 建案例子(这是个小洞洞) 但我会试着在继续前进时 增加更多 要安装 :

dotnet add package mostlylucid.pagingtaghelper

Flippy 标签帮助工具

Flippy 标签辅助工具

那么,这是什么? 简言之,这是产生一张表格页眉(或其它任何地方)的一种方式, 它可以让您整理出一张结果表。

它最简单(没有HTMX整合), 它让你这样做。

    <sortable-header column="@nameof(FakeDataModel.CompanyCity)"
                             current-order-by="@Model.OrderBy"
                             descending="@Model.Descending"
                             controller="Home"
                             use-htmx="false"
                             action="PageSortTagHelperNoHtmx"
                       >@Html.DisplayNameFor(x => x.Data.First().CompanyCity)
</sortable-header>

您可以在此看到您指定了列名称、 信头测试、 信头测试以及后挂位置( 感谢 喷气冲压图。 以及我几乎未触及到的 给主计长与行动 命名的英特利森的表面。

这将产生连接, 并重新连接到 PageSortTagHelperNoHtmx 行动的执行情况以及进一步的行动和进一步 Home 与 URL 中的列名、当前排序顺序和任何其他参数(与 auto-append-querystring 属性。 这样您就可以很容易地获得一个有用的后退链接, 您可以在下面看到, 我使它非常灵活, 您可以指定 href / action & control 并获得一个链接, 与附加的查询字符串参数连接 。

    private void AddQueryStringParameters(TagHelperOutput output, bool newDescending)
    {
        string? href = "";

        // If Controller and Action are provided, generate URL dynamically
        if (!string.IsNullOrEmpty(Controller) && !string.IsNullOrEmpty(Action))
        {
            href = Url.ActionLink(Action, Controller);
          
        }
        else if (output.Attributes.ContainsName("href")) // If href is manually set, use it
        {
            href = output.Attributes["href"].Value?.ToString() ?? "";
        }
        if(string.IsNullOrEmpty(href)) throw new ArgumentException("No href was provided or could be generated");
        
        // If AutoAppend is false or href is still empty, don't modify anything
        if (!AutoAppend && !string.IsNullOrWhiteSpace(href))
        {
            output.Attributes.RemoveAll("href");
            output.Attributes.SetAttribute("href", href);
            return;
        }

        // Parse the existing URL to append query parameters
        var queryStringBuilder = QueryString.Empty
            .Add("orderBy", Column)
            .Add("descending", newDescending.ToString().ToLowerInvariant());

        // Preserve existing query parameters from the current request
        foreach (var key in ViewContext.HttpContext.Request.Query.Keys)
        {
            var keyLower = key.ToLowerInvariant();
            if (keyLower != "orderby" && keyLower != "descending") // Avoid duplicating orderBy params
            {
             queryStringBuilder=   queryStringBuilder.Add(key, ViewContext.HttpContext.Request.Query[key]!);
            }
        }
href+= queryStringBuilder.ToString();
        
        // Remove old href and set the new one with the appended parameters
        output.Attributes.RemoveAll("href");
        output.Attributes.SetAttribute("href", href);
    }

这是将查询字符串参数附加到 URL 的方法 。 很简单,它产生一个基于 ControllerAction 属性,或者如果您设置了 href 它会使用此属性 。 如果你已经设置 AutoAppend 假以假的, href 属性的原样( 您可以在特定使用大小写中自行滚动) 。

疯狂配置

利用/不使用HTMX,使这项工作尽可能有用。 / 没有尾风 & DaisiliUI 等, 我给您一个属性 BUNCH 属性, 用于配置此相对简单的控件

    [HtmlAttributeName("hx-controller")]
    [AspMvcController] // Enables IntelliSense for controller names
    public string? HXController { get; set; }

    [HtmlAttributeName("hx-action")]
    [AspMvcAction] // Enables IntelliSense for action names
    public string? HXAction { get; set; }
    
    
    [HtmlAttributeName("action")]
    [AspMvcAction]
    public string? Action { get; set; }
    
    [HtmlAttributeName("controller")]
    [AspMvcController]
    public string? Controller { get; set; }
    
    [ViewContext]
    [HtmlAttributeNotBound]
    public ViewContext ViewContext { get; set; }
    /// <summary>
    /// The column to sort by
    /// </summary>

    [HtmlAttributeName("column")] public string Column { get; set; } = string.Empty;

    /// <summary>
    /// Whether to auto-append any query string parameters
    /// </summary>

    [HtmlAttributeName("auto-append-querystring")] public bool AutoAppend { get; set; } = true;
    
    // <summary>
    /// Whether to use htmx ; specifcally used to set hx-vals
    /// </summary>

    [HtmlAttributeName("use-htmx")] public bool UseHtmx { get; set; } = true;

    /// <summary>
    /// The currently set order by column
    /// </summary>

    [HtmlAttributeName("current-order-by")]
    public string? CurrentOrderBy { get; set; }

    /// <summary>
    /// Sort direction, true for descending, false for ascending
    /// </summary>

    [HtmlAttributeName("descending")] public bool Descending { get; set; }

    
    /// <summary>
    ///  CSS class for the chevron up icon
    /// </summary>

    [HtmlAttributeName("chevron-up-class")]
    public string? ChevronUpClass { get; set; }
    
    /// <summary>
    ///  CSS class for the chevron down icon
    /// </summary>


    [HtmlAttributeName("chevron-down-class")]
    public string? ChevronDownClass { get; set; }
    
    /// <summary>
    /// The CSS class for the chevron when unsorted
    /// </summary>

    
    [HtmlAttributeName("chevron-unsorted-class")]
    public string? ChevronUnsortedClass { get; set; }

    /// <summary>
    /// The CSS class to use for the tag.
    /// </summary>

    [HtmlAttributeName("tag-class")] public string? TagClass { get; set; }

你们可以看到,我拥有所有能控制的一切的属性(我不会在这里通过它们,它们应该非常不言自明)。

使用 HTMX 与 HTMX

现在你可能已经知道 我是HTMX NUT 和往常一样 这支支持HTMX的支架非常顺畅: 它认为: use-htmx 填满在 hx-vals 属性。 加上这个,我用 HTMX 标签辅助工具 使代码尽可能简单。

            <sortable-header column="Name"
                             current-order-by="@Model.OrderBy"
                             descending="@Model.Descending"
                             hx-get
                             hx-route-pagesize="@Model.PageSize"
                             hx-route-page="@Model.Page"
                             hx-route-search="@Model.SearchTerm"
                             hx-controller="Home"
                             hx-action="PageSortTagHelper"
                             hx-indicator="#loading-modal"
                             hx-target="#list"
                             hx-push-url="true">@Html.DisplayNameFor(x => x.Data.First().Name)
            </sortable-header>

就是这样,它只是地盘 工程 与HTMX无缝无缝。

MVC 主计长

然后把这个发回给一个简单的MVC主计长, 他生成了一些样本数据:

    [Route("PageSortTagHelper")]
    public async Task<IActionResult> PageSortTagHelper(string? search, int pageSize = 10, int page = 1, string? orderBy = "", bool descending = false)
    {
        var pagingModel = await SortResults(search, pageSize, page, orderBy, descending);

        if (Request.IsHtmxBoosted() || Request.IsHtmx())
        {
            return PartialView("_PageSortTagHelper", pagingModel);
        }
        return View("PageSortTagHelper", pagingModel);
    }
    
     private async Task<OrderedPagingViewModel> SortResults(string? search, int pageSize, int page, string? orderBy, bool descending)
    {
        search = search?.Trim().ToLowerInvariant();
        var fakeModel = await dataFakerService.GenerateData(1000);
        var results = new List<FakeDataModel>();

        if (!string.IsNullOrEmpty(search))
            results = fakeModel.Where(x => x.Name.ToLowerInvariant().Contains(search)
                                           || x.Description.ToLowerInvariant().Contains(search) ||
                                           x.CompanyAddress.ToLowerInvariant().Contains(search)
                                           || x.CompanyEmail.ToLowerInvariant().Contains(search)
                                           || x.CompanyCity.ToLowerInvariant().Contains(search)
                                           || x.CompanyCountry.ToLowerInvariant().Contains(search)
                                           || x.CompanyPhone.ToLowerInvariant().Contains(search)).ToList();
        else
        {
            results = fakeModel.ToList();
        }

        if (!string.IsNullOrWhiteSpace(orderBy))
        {
            results = results.OrderByField(orderBy, descending).ToList();
        }

        var pagingModel = new OrderedPagingViewModel();
        pagingModel.TotalItems = results.Count();
        pagingModel.Page = page;
        pagingModel.SearchTerm = search;
        pagingModel.PageSize = pageSize;
        pagingModel.Data = results.Skip((page - 1) * pageSize).Take(pageSize).ToList();
        pagingModel.OrderBy = orderBy;
        pagingModel.Descending = descending;
        return pagingModel;
    }

缩略 OrderByField 推广方法

哦,我有一个小的扩展方法包包, 将一个命名的顺序字段应用到数据上( 或) IQueryable 等) 整个扩展方法如下。 您可以看到它有三种方法,一种是强打列名称,一种是IQueryable 字符串列名称,一种是IEO 数列名称。

using System.Linq.Expressions;
using System.Reflection;

namespace mostlylucid.pagingtaghelper.Extensions;

public static class QueryableExtensions
{
    public static IQueryable<T> OrderByField<T, TKey>(
        this IQueryable<T> source,
        Expression<Func<T, TKey>> keySelector,
        bool descending = false)
    {
        return descending ? source.OrderByDescending(keySelector) : source.OrderBy(keySelector);
    }


    public static IQueryable<T> OrderByField<T>(
        this IQueryable<T> source,
        string sortBy,
        bool descending = false)
    {
        if (string.IsNullOrWhiteSpace(sortBy))
            return source; // No sorting applied

        var property =
            typeof(T).GetProperty(sortBy, BindingFlags.IgnoreCase | BindingFlags.Public | BindingFlags.Instance);
        if (property == null)
            throw new ArgumentException($"Property '{sortBy}' not found on type '{typeof(T)}'.");

        var param = Expression.Parameter(typeof(T), "x");
        var propertyAccess = Expression.MakeMemberAccess(param, property);
        var lambda = Expression.Lambda(propertyAccess, param);

        var methodName = descending ? "OrderByDescending" : "OrderBy";

        var resultExpression = Expression.Call(
            typeof(Queryable),
            methodName,
            new[] { typeof(T), property.PropertyType },
            source.Expression,
            Expression.Quote(lambda)
        );

        return source.Provider.CreateQuery<T>(resultExpression);
    }
    
    public static IEnumerable<T> OrderByField<T>(
        this IEnumerable<T> source,
        string sortBy,
        bool descending = false)
    {
        var property = typeof(T).GetProperty(sortPropertyName(sortBy), BindingFlags.IgnoreCase | BindingFlags.Public | BindingFlags.Instance);
        if (property == null)
            throw new ArgumentException($"Property '{sortBy}' not found on type '{typeof(T)}'.");

        return descending
            ? source.OrderByDescending(x => property.GetValue(x, null))
            : source.OrderBy(x => property.GetValue(x, null));
    }

    // Helper methods for readability (optional)
    private static string sortPropertyName(string sortBy) => sortBy.Trim();
    private static string methodName(bool descending) => descending ? "OrderByDescending" : "OrderBy";
}

在结论结论中

就是这样 这只是我需要的东西 所以我把它建在了核子包里

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