剃刀视图字符串与ASP.NET Core 2表单输入验证

• Z时代
• 2024-01-10
• 分类：问答

我使用.NET核心2.我已经找到了渲染剃刀视图的字符串的解决方案。较低的MVC版本，我用它和everthing是好的。 我得到结果/表单到引导模态。当我发布到控制器（例如UserName空值）时，我无法从ModelState获得结果到<span asp-validation-for="UserName" class="text-danger"></span>，哪里有问题？ 当我不使用RenderToStringAsync方法和return View()我从ModelState得到<span asp-validation-for="UserName" class="text-danger"></span>的结果。 总是actionContext ModelState值或键也是空的。剃刀视图字符串与ASP.NET Core 2表单输入验证

我的服务器端：

public class RazorViewToStringRenderer 
    { 
     private readonly IRazorViewEngine viewEngine; 
     private readonly ITempDataProvider tempDataProvider; 
     private readonly IHttpContextAccessor _httpContext; 
     public RazorViewToStringRenderer(
      IRazorViewEngine viewEngine, 
      ITempDataProvider tempDataProvider, 
      //IServiceProvider serviceProvider, 
      IHttpContextAccessor httpContext) 
     { 
      this.viewEngine = viewEngine; 
      this.tempDataProvider = tempDataProvider; 
      _httpContext = httpContext; 
     } 
     public async Task<string> RenderToStringAsync(string viewName, object model) 
     { 
      var httpContext = _httpContext.HttpContext; 
      var actionContext = new ActionContext(httpContext, new RouteData(), new ActionDescriptor()); 
      using (var sw = new StringWriter()) 
      { 
       var viewResult = viewEngine.FindView(actionContext, viewName, false); 
       if (viewResult.View == null) 
       { 
        throw new ArgumentNullException($"{viewName} does not match any available view"); 
       } 
       var viewDictionary = new ViewDataDictionary(new EmptyModelMetadataProvider(), new ModelStateDictionary()) 
       { 
        Model = model 
       }; 
       var viewContext = new ViewContext(
         actionContext, 
         viewResult.View, 
         viewDictionary, 
         new TempDataDictionary(actionContext.HttpContext, tempDataProvider), 
         sw, 
         new HtmlHelperOptions() 
        ) 
       { RouteData = httpContext.GetRouteData() }; 
       await viewResult.View.RenderAsync(viewContext); 
       return sw.ToString(); 
      } 
     } 
    } 

客户端：

@model EditUserViewModel 
     <form asp-controller="Account" asp-action="EditUser" asp-antiforgery="true" data-ajax-success="onSuccess" data-ajax="true" data-ajax-begin="onBegin" method="post" class="form-horizontal" role="form"> 
    .... 
      <div class="form-group"> 
       <div class="col-sm-12"> 
        <label asp-for="UserName" class="col-form-label"></label> 
        <input asp-for="UserName" class="form-control" /> 
        <span asp-validation-for="UserName" class="text-danger"></span> 
       </div> 
      </div> 
    .... 
    </form> 

控制器：

[HttpPost] 
public async Task<IActionResult> EditUser(EditUserViewModel editUserViewModel) 
{ 
    var user = await _userManager.FindByIdAsync(editUserViewModel.Id); 
    if (user != null) 
    { 
     user.UserName = editUserViewModel.UserName; 
     user.FirstName = editUserViewModel.FirstName; 
     user.LastName = editUserViewModel.LastName; 
     var result = await _userManager.UpdateAsync(user); 
     if (ModelState.IsValid) 
     { 
      if (result.Succeeded) 
       return Json("Ok"); 
     } 
     else 
     { 
      return Json(new 
      { 
       ModalClose = false, 
       Data = _renderer.RenderToStringAsync("EditUser", editUserViewModel) 
      }); 
     } 
    } 
    return RedirectToAction("UserManagement", _userManager.Users); 
} 

填写结果：

function onSuccess(data, status, xhr) 
{ 
    $("#" + modid + " .modal-body").empty(); 
    $("#" + modid + " .modal-body").html(data.data.result); 
} 

视图模型：

public class EditUserViewModel 
    { 
     public string Id { get; set; } 
     [Display(Name = "User Name")] 
     [Required(ErrorMessage = "UserName required")]  
     public string UserName { get; set; } 
     [Display(Name = "First Name")] 
     [Required(ErrorMessage = "FirstName required")] 
     public string FirstName { get; set; } 
} 

回答：

services.AddSingleton<IActionContextAccessor, ActionContextAccessor>(); 

var viewDictionary = new ViewDataDictionary(new EmptyModelMetadataProvider(), _contenxt.ActionContext?.ModelState ?? new ModelStateDictionary()) 
{ 
    Model = model 
}; 

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