How Can I Render a View as a String in .NET Core?

Returning a View as a String in .NET Core

Introduction

In ASP.NET, there are times when it may be necessary to convert a view to a string for various purposes, such as sending HTML as part of an email or feeding a report generator. However, converting views to strings using code designed for ASP.NET is not directly applicable to .NET Core.

Conversion to .NET Core

To make the conversion to .NET Core, it is essential to understand the differences in the underlying frameworks. Unlike ASP.NET, .NET Core does not provide a built-in method for this task.

Provided Solution

To address this issue, a custom extension method has been created for Controller in .NET Core:

public static async Task<string> RenderViewAsync<TModel>(this Controller controller, string viewName, TModel model, bool partial = false)

Key Differences

The provided extension method offers several key differences from the ASP.NET version:

• Model strong-typing: The model argument is now strongly typed to avoid casting errors.
• Error checking: It includes error checking to handle situations where a view is not found.
• Partial/page rendering: It allows rendering views as both partials or complete pages.
• Asynchronus execution: It is implemented asynchronously to enhance performance.
• Controller extension: It is implemented as a Controller extension, simplifying its use.
• No dependency injection required: It doesn't require dependency injection, making it easier to implement.

Usage

To use this extension, simply call:

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

Or, for a partial view:

partialViewHtml = await this.RenderViewAsync("Report", model, true);

This provides a robust and customizable way to return views as strings in .NET Core applications.

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