How to Render a View as a String in .NET Core?

How to Return a View as a String in .NET Core

Overview

Returning a view as a string can be useful in various scenarios, such as when generating reports or emails. This article provides a solution for converting a view to a string in .NET Core, addressing compilation errors and offering alternative approaches.

Converting Existing Code to .NET Core

The provided code assumes the use of System.Web.Mvc, which is not available in .NET Core. To adapt it, you need the following:

• Install the Microsoft.AspNetCore.Mvc NuGet package with a version of at least 1.1.0.
• Replace Controller with ControllerBase.
• Add ViewEngines.Engines using using Microsoft.AspNetCore.Mvc.ViewEngines;.
• Remove dependency on System.Web.Routing.
• Use IViewEngine viewEngine = controller.HttpContext.RequestServices.GetService(typeof(ICompositeViewEngine)) as ICompositeViewEngine; to retrieve the view engine.

An Alternative Extension Method

An alternative approach involves creating a controller extension method that leverages some features of .NET Core:

public static async Task<string> RenderViewAsync<TModel>(this Controller controller, string viewName, TModel model, bool partial = false)
{
    // ... Implement the logic as described in the provided code
}

Usage

To use this method, you can simply call it from your controller:

var viewHtml = await this.RenderViewAsync("Report", model);

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