如何在Umbraco 10控制器中调用GetGridHtml方法？

你在Umbraco API控制器中需要渲染Grid属性，但GetGridHtml方法依赖IHtmlHelper，而控制器默认没有这个实例。可以通过以下两种方式解决：

方法一：手动创建IHtmlHelper实例 #

通过注入IHtmlHelperFactory和IViewContextAccessor，手动初始化IHtmlHelper所需的上下文：

1. 修改控制器构造函数，注入依赖：

private readonly IUmbracoHelper _umbracoHelper;
private readonly IHtmlHelperFactory _htmlHelperFactory;
private readonly IViewContextAccessor _viewContextAccessor;

public YourApiController(IUmbracoHelper umbracoHelper, 
                         IHtmlHelperFactory htmlHelperFactory, 
                         IViewContextAccessor viewContextAccessor)
{
    _umbracoHelper = umbracoHelper;
    _htmlHelperFactory = htmlHelperFactory;
    _viewContextAccessor = viewContextAccessor;
}

2. 在Action中创建并配置IHtmlHelper：

[HttpGet]
[Route("api/myapp/version/")]
public IActionResult GetLatestMyAppVersion()
{
    var releaseNote = _umbracoHelper.ContentAtXPath("//releaseNoteList").First().Children()
        .OrderByDescending(x => x.Value<DateTime>("releaseDate")).First();
    var ver = releaseNote.Value<string>("myAppReleaseVersion");
    var date = releaseNote.Value<DateTime>("releaseDate");
    
    // 初始化ViewContext
    var viewContext = new ViewContext
    {
        HttpContext = HttpContext,
        RouteData = RouteData,
        ViewData = ViewData
    };
    
    // 设置当前ViewContext到访问器
    _viewContextAccessor.ViewContext = viewContext;
    
    // 创建IHtmlHelper实例
    var htmlHelper = _htmlHelperFactory.CreateHelper(viewContext);
    
    // 调用GetGridHtml
    var desc = releaseNote.GetGridHtml(htmlHelper, "mainContent", "Clean");

    return Ok(new { Application = "MyApp", Version = ver, ReleaseDate = date.ToString("yyyy-MM-dd"), Description = desc.ToString() });
}

方法二：直接使用IGridRenderer服务（更推荐） #

Umbraco的GetGridHtml底层依赖IGridRenderer服务，你可以直接注入该服务来渲染Grid内容，避免手动处理IHtmlHelper的繁琐：

1. 注入IGridRenderer：

private readonly IUmbracoHelper _umbracoHelper;
private readonly IGridRenderer _gridRenderer;

public YourApiController(IUmbracoHelper umbracoHelper, IGridRenderer gridRenderer)
{
    _umbracoHelper = umbracoHelper;
    _gridRenderer = gridRenderer;
}

2. 在Action中渲染Grid：

[HttpGet]
[Route("api/myapp/version/")]
public IActionResult GetLatestMyAppVersion()
{
    var releaseNote = _umbracoHelper.ContentAtXPath("//releaseNoteList").First().Children()
        .OrderByDescending(x => x.Value<DateTime>("releaseDate")).First();
    var ver = releaseNote.Value<string>("myAppReleaseVersion");
    var date = releaseNote.Value<DateTime>("releaseDate");
    
    // 获取Grid的原始值（JObject）
    var gridValue = releaseNote.Value<JObject>("mainContent");
    
    // 使用GridRenderer渲染，指定"Clean"视图
    var desc = _gridRenderer.Render(gridValue, "Clean");

    return Ok(new { Application = "MyApp", Version = ver, ReleaseDate = date.ToString("yyyy-MM-dd"), Description = desc.ToString() });
}

注意：两种方法最终都需要将渲染结果转成字符串（ToString()），因为GetGridHtml和Render返回的是IHtmlContent类型，直接序列化JSON会有问题。

内容的提问来源于stack exchange，提问作者Frederik T