Using the Razor view engine to render a view as a string (go) in ASP.

First, the View rendering description

In some project requirements may need to produce static pages according to the template, then you can use the Razor syntax to directly parse your page to generate a static page of the parsed page, so many scenarios, not limited to generating static pages, The view engine gives us the ability to generate code or text from the model to the view.

Of course, in the era of MVC 4 and 5, we also used a third-party view engine such as Razorengine , when the razor in MVC was more tightly coupled to the framework, Third-party open source components enable us to use razor render views as text in any project, but razorengine open source components in. NET core are not ported.

Second, this example creates a service that handles the view and parameters that will make the path, parsing it into a string

/// <summary>///Defining the View rendering service/// </summary> Public classviewrenderservice:iviewrenderservice{Private ReadOnlyIrazorviewengine _razorviewengine; Private ReadOnlyItempdataprovider _tempdataprovider; Private ReadOnlyIServiceProvider _serviceprovider;  PublicViewrenderservice (irazorviewengine razorviewengine, Itempdataprovider Tempdataprovider, IServiceProvide R serviceprovider) {_razorviewengine=Razorviewengine; _tempdataprovider=Tempdataprovider; _serviceprovider=serviceprovider; }     Public Asynctask<string> Rendertostringasync (stringViewName,Objectmodel) {        varHttpContext =NewDefaulthttpcontext {requestservices =_serviceprovider}; varActioncontext =NewActioncontext (HttpContext,NewRoutedata (),Newactiondescriptor ()); using(varSW =NewStringWriter ()) {            varViewResult = _razorviewengine.findview (Actioncontext, ViewName,false); if(Viewresult.view = =NULL)            {                Throw NewArgumentNullException ($"{viewName} does not match any available view"); }            varViewdictionary =NewViewdatadictionary (NewEmptymodelmetadataprovider (),Newmodelstatedictionary ()) {Model=model}; varViewContext =NewViewContext (Actioncontext, Viewresult.view, Viewdictionary, Newtempdatadictionary (Actioncontext.httpcontext, _tempdataprovider), SW,Newhtmlhelperoptions ()); awaitViewResult.View.RenderAsync (ViewContext); returnSW.        ToString (); }    }} Public Interfaceiviewrenderservice{Task<string> Rendertostringasync (stringViewName,Objectmodel);}

Use procedure:

1. Registration service, in Configureservices ()

// bind service, Services. Addscoped<iviewrenderservice, viewrenderservice> ();

2. Invoking the method through the service in the controller

 Public classemall1mvccontroller:controller{PrivateIviewrenderservice _view =NULL;  PublicEmall1mvccontroller (Iviewrenderservice view) { This. _view=view; }     PublicIactionresult Index () {returnView (123); }    //Call the service method, return the HTML string     Public Asynctask<string>Test1 () {return await_view. Rendertostringasync ("Emall1mvc/index",456); }}

@model int@{    viewdata["Title"] = "Index";} < H2 > Index</h2> Test variables are as follows:<p>     @Model   </ P >

return the result;

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Use the Razor view engine to render a view as a string (go) in an ASP. NET Core