I am using RazorEngine to get the view and load it as html.but however my problem is I am reading html code from my database,and show it on my web page .but it gave me string result on my web page rather then html output.
how can I solve this problem
thank you in advace
My simple view like this
#model Cms.ViewModules.MasterPageViewModel
#Model.PageLanguageViewModel.HtmlCode
and this is how get the view as html from my views
public static class HtmlHelperPageContent
{
public static IHtmlString GetPageAll(this HtmlHelper htmlHelper, MasterPageViewModelmodel)
{
string page = model.PageLanguageViewModel.SablonHtlmCodu;
List<string> registeredModules = PageModulles.RegisteredModules;
foreach (var modulename in registeredModules )
{
string fullmodulename = "${" + modulename + "}";
if (page.Contains(fullmodulename ))
{
string viewname = modulename.Insert(0, "PW_");
IHtmlString value = RenderViewHelper.RenderPartialToString("Views/Default/" + viewname + ".cshtml", model);
page=page.Replace(fullmodulename , value.ToHtmlString());
}
}
return MvcHtmlString.Create(page);
}
RenderViewHelper class
public static class RenderViewHelper
{
public static IHtmlString RenderPartialToString(string viewPath, object model)
{
string viewAbsolutePath = MapPath(viewPath);
var viewSource = File.ReadAllText(viewAbsolutePath);
string renderedText = Razor.Parse(viewSource, model);
return new MvcHtmlString(renderedText);
}
}
Another way would be to use IEncodedString (https://github.com/Antaris/RazorEngine/blob/master/src/source/RazorEngine.Core/Text/IEncodedString.cs) instead of IHtmlString by creating a RawString (https://github.com/Antaris/RazorEngine/blob/master/src/source/RazorEngine.Core/Text/RawString.cs) instance.
#Raw does exactly that behind the scenes (https://github.com/Antaris/RazorEngine/blob/master/src/source/RazorEngine.Core/Templating/TemplateBase.cs#L147).
#Raw(#Model.PageLanguageViewModel.HtmlCode) solved my problem
Related
I'd like to be able to feed in a list of parameter names and values into a Html.Actionlink but the helper doesn't create the parameters as I would like. Any ideas how to do this?
public class ParameterNameValue
{
public string ParameterName { get; set; }
public string ParameterValue { get; set; }
}
View
#foreach (var action in post.FeedActions)
{
var parameters = "";
foreach (var param in action.Parameters)
{
parameters += param.ParameterName + "=" + param.ParameterValue + ",";
}
#Html.ActionLink(#action.Label, action.ActionName,
new { controller = action.Controller, id = action.CommunityId, slug = action.Slug,
Fromfeed=true,parameters }, new { #class = action.Classes })
}
yields a link like this:
Whereas I need the parameters part to look like:
?FromFeed=true&MatchId=1234&InnerId=5678
edit: I got it working by just manually creating the tag, but no doubt there's a nice way of doing this by creating a custom helper.
#action.Label
I'd suggest you to extend the classic ActionLink helper with a prototype similar to this (add a parameter for your specific class) :
public static MvcHtmlString ActionLinkCustom(this HtmlHelper html, string linkText, string actionName, string controllerName, object routeValues, List<ParameterNameValue> yourOtherValues)
In the code, check if you got any custom values. If such, add them to the RouteValuesDictionnary. Then use the classic ActionLink helper providing this modified RouteValuesDictionnary.
Note : you can work on the routeValues using this
IDictionary<string, object> RouteValues = HtmlHelper.ObjectToDictionary(routeValues);
As the title suggests, I am looking for a way to export a .NET MVC View to a PDF.
My program works like this:
Page 1
Takes in information
Page 2
Takes this information and heavily styles it with CSS etc
So basically I need to save page 2 after it has been processed and used the information from Page 1's model.
Thanks in advance!
To render a non-static page to a pdf, you need to render the page to a string, using a ViewModel, and then convert to a pdf:
Firstly, create a method RenderViewToString in a static class, that can be referenced in a Controller:
public static class StringUtilities
{
public static string RenderViewToString(ControllerContext context, string viewPath, object model = null, bool partial = false)
{
// first find the ViewEngine for this view
ViewEngineResult viewEngineResult = null;
if (partial)
{
viewEngineResult = ViewEngines.Engines.FindPartialView(context, viewPath);
}
else
{
viewEngineResult = ViewEngines.Engines.FindView(context, viewPath, null);
}
if (viewEngineResult == null)
{
throw new FileNotFoundException("View cannot be found.");
}
// get the view and attach the model to view data
var view = viewEngineResult.View;
context.Controller.ViewData.Model = model;
string result = null;
using (var sw = new StringWriter())
{
var ctx = new ViewContext(context, view, context.Controller.ViewData, context.Controller.TempData, sw);
view.Render(ctx, sw);
result = sw.ToString();
}
return result.Trim();
}
}
Then, in your Controller:
var viewModel = new YourViewModelName
{
// Assign ViewModel values
}
// Render the View to a string using the Method defined above
var viewToString = StringUtilities.RenderViewToString(ControllerContext, "~/Views/PathToView/ViewToRender.cshtml", viewModel, true);
You then have the view, generated by a ViewModel, as a string that can be converted to a pdf, using one of the libraries out there.
Hope it helps, or at least sets you on the way.
In ASP.NET Core, I need to fetch the content value from the namespace Microsoft.AspNetCore.Mvc.Razor.HelperResult and assign the value in a variable but its assigning the namespace to that variable.
It works fine in MVC when i use namespace System.Web.WebPages.HelperResult and assign that content to variable. (Content are some html elements).
Please, check the picture to find the issue.
My code:
Variable with namespace name as value
In .NET Core HelperResult returns IHtmlContent instead of IHtmlString.
For IHtmlContent it might be convenient to use an extension like the one mentioned here:
public static IHtmlContent GetList(this IHtmlHelper helper)
{
var listHtml = new HtmlContentBuilder();
listHtml.AppendHtml("<ol><li>");
listHtml.AppendHtml(helper.ActionLink("foo", "bar", "example"));
listHtml.AppendHtml("</li></ol>");
return listHtml;
}
Try this (since HelperResult implements IHtmlContent interface):
public static string ToHtmlString(this IHtmlHelper source, IHtmlContent htmlContent)
{
var sb = new StringBuilder();
using (TextWriter tw = new StringWriter(sb))
{
var encoder = (HtmlEncoder)source.ViewContext.HttpContext.RequestServices.GetService(typeof(HtmlEncoder));
htmlContent.WriteTo(tw, encoder);
}
return sb.ToString();
}
and call this method in your Razor view like this:
#Html.ToHtmlString(helperResultObject)
Is their a way to convert a string (this string can change and contains asp-route-... attributes) to a list of html attributes? The razor engine should use all the asp-route-... attributes to convert to a correct url. I have the following code but that doesn't work.
#{
var Attributes = ViewData["Attributes"] as Dictionary<string,string>;
var AttributeRoute = "";
#foreach (var key in Attributes.Keys)
{
AttributeRoute += "asp-route-"+key+"=\""+Attributes[key]+"\" ";
}
}
...
#AttributeRoute #Prints output (ex. asp-route-testkey="testvalue")
<a class='item' #AttributeRoute>test</a> #Doesn't print the list of attributes
Solved it myself by doing the following:
1. Create custom Taghelper class
namespace test
{
[HtmlTargetElement("special-link")]
public class SpecialLinkTagHelper : TagHelper
{
[ViewContext]
public ViewContext ViewContext { get; set; }
public override void Process(TagHelperContext context, TagHelperOutput output)
{
//Create a tag
output.TagName="a";
//Get the parameters
string parameters="";
Dictionary<string,string> Parameters = (Dictionary<string,string>)this.ViewContext.ViewData["Attributes"];
foreach(KeyValuePair<string, string> pair in Parameters){
parameters+= pair.Key+"="+pair.Value+"&";
}
output.Attributes.SetAttribute("href", "?"+parameters);
}
}
}
2. Create Link (in a .cshtml file)
<special-link>link</special-link>
Hope this can help someone!
How does MVC 6 renders a view. What's the actual method in Razor ViewEngine that generates the html output? Also if possible please explain the process of rendering a view.
May be you could point me to a file on mvc source on github. thanks!
Here is a complete solution of what you are looking for. I used dependency injection to get the HtmlHelper in the controller. You can inject your own helper if you want too.
using Microsoft.AspNet.Html.Abstractions;
using Microsoft.AspNet.Mvc;
using Microsoft.AspNet.Mvc.ModelBinding;
using Microsoft.AspNet.Mvc.Rendering;
using Microsoft.AspNet.Mvc.ViewEngines;
using Microsoft.AspNet.Mvc.ViewFeatures;
using Microsoft.AspNet.Mvc.ViewFeatures.Internal;
using Microsoft.Extensions.WebEncoders;
using System.ComponentModel.DataAnnotations;
using System;
public class MyController : Controller
{
private readonly IHtmlGenerator htmlGenerator;
ICompositeViewEngine viewEngine;
IModelMetadataProvider metadataProvider;
private readonly IHtmlHelper helper;
IHtmlEncoder htmlEncoder;
IUrlEncoder urlEncoder;
IJavaScriptStringEncoder javaScriptStringEncoder;
public MyController(IHtmlHelper helper, IHtmlGenerator htmlGenerator, ICompositeViewEngine viewEngine, IModelMetadataProvider metadataProvider, IHtmlEncoder htmlEncoder, IUrlEncoder urlEncoder, IJavaScriptStringEncoder javaScriptStringEncoder)
{
this.htmlGenerator = htmlGenerator;
this.viewEngine = viewEngine;
this.metadataProvider = metadataProvider;
this.htmlEncoder = htmlEncoder;
this.urlEncoder = urlEncoder;
this.javaScriptStringEncoder = javaScriptStringEncoder;
this.helper = helper;
}
[HttpGet]
public IActionResult MyHtmlGenerator()
{
MyViewModel temp = new MyViewModel();
var options = new HtmlHelperOptions();
options.ClientValidationEnabled = true;
ViewDataDictionary<MyViewModel> dic = new ViewDataDictionary<MyViewModel>(this.metadataProvider, new ModelStateDictionary());
ViewContext cc = new ViewContext(ActionContext, new FakeView(), dic, TempData, TextWriter.Null, options);
var type = typeof(MyViewModel);
var metadata = this.metadataProvider.GetMetadataForType(type);
ModelExplorer modelEx = new ModelExplorer(this.metadataProvider, metadata, temp);
ViewData["Description"] = "test desc";
ViewData["Id"] = 1;
this.ViewData = new ViewDataDictionary(this.metadataProvider, new ModelStateDictionary());
IHtmlHelper<MyViewModel> dd = new HtmlHelper<MyViewModel>(this.htmlGenerator, this.viewEngine, this.metadataProvider, this.htmlEncoder, this.urlEncoder, this.javaScriptStringEncoder);
((ICanHasViewContext)dd).Contextualize(cc);
dd.ViewContext.ViewData = this.ViewData;
var desc = GetString(dd.TextBoxFor(m => m.ID));
var ID = GetString(dd.TextBoxFor(m => m.Description));
// Do whatever you want with the ID and desc
return new ContentResult() { Content = ID + desc };
}
public static string GetString(IHtmlContent content)
{
var writer = new System.IO.StringWriter();
content.WriteTo(writer, new HtmlEncoder());
return writer.ToString();
}
}
public class MyViewModel : BaseAssetViewModel
{
// [RegularExpression(#"^-?\d{1,13}(\.\d{0,5})?$|^-?\.\d{1,5}$")]
[Required]
public int ID { get; set; }
[MinLength(2)]
public string Description { get; set; }
// Property with no validation
public string Other { get; set; }
}
public class FakeView : IView
{
string IView.Path
{
get
{
throw new NotImplementedException();
}
}
public Task RenderAsync(ViewContext viewContext)
{
throw new InvalidOperationException();
}
Task IView.RenderAsync(ViewContext context)
{
throw new NotImplementedException();
}
}
I don't know if this may be of help, may be you have to start to look at tag helpers:
https://github.com/DamianEdwards/TagHelperStarterWeb
they're working to a different way to create helpers that integrate in the page in a more natural way.