如何在ASP.NET Core Razor Pages中检查指定Razor视图是否存在

你使用的ViewEngine.FindView默认遵循MVC视图的查找规则，仅扫描/Views/{ControllerName}、/Views/Shared、/Pages/Shared等预设目录，不会自动匹配Razor Pages目录下同层级的普通Razor视图，因此文件存在时也会返回false。

方案1：使用GetView按相对路径查找（推荐） #

直接基于当前执行的视图路径，传入同目录下的视图名即可，无需编写全路径：

// 在List.cshtml视图中直接使用
var viewResult = ViewEngine.GetView(
    executingFilePath: ViewContext.ExecutingFilePath, 
    viewPath: "Augmenter.cshtml", 
    isMainPage: false);
bool viewExists = viewResult.Success;

如果是在List.cshtml.cs对应的PageModel中调用，需要先注入IViewEngine服务：

public class ListModel : PageModel
{
    private readonly IViewEngine _viewEngine;

    public ListModel(IViewEngine viewEngine)
    {
        _viewEngine = viewEngine;
    }

    public void OnGet()
    {
        var viewResult = _viewEngine.GetView(ViewContext.ExecutingFilePath, "Augmenter.cshtml", false);
        bool viewExists = viewResult.Success;
    }
}

方案2：传入完整根路径调用FindView #

直接填写视图从项目根开始的绝对路径，必须带.cshtml后缀：

var viewResult = ViewEngine.FindView(
    ViewContext, 
    "/Pages/Gallery/Augmenter.cshtml", 
    isMainPage: false);
bool viewExists = viewResult.Success;

内容的提问来源于stack exchange，提问作者Alireza Hosseinitabar