ContentHttpResult(string? content, string? contentType, int? statusCode) should be public

[jhudsoncedaron]

Background and Motivation

Normally, ContentResult is created from a controller method Content(); however we got here when an ActionFilterAttribute has determined the request cannot continue. So we need to create a ContentHttpResult without calling any methods on a controller.

Previously we would throw out of OnActionExecuting but operations has been complaining about useless logspam.

Proposed API

namespace Microsoft.AspNetCore.Http.HttpResults;

/// <summary>
/// An <see cref="ContentHttpResult"/> that when executed
/// will produce a response with content.
/// </summary>
public sealed partial class ContentHttpResult : IResult, IStatusCodeHttpResult, IContentTypeHttpResult
{
    /// <summary>
    /// Initializes a new instance of the <see cref="ContentHttpResult"/> class with the values
    /// </summary>
    /// <param name="content">The value to format in the entity body.</param>
    /// <param name="statusCode">The HTTP status code of the response.</param>
    /// <param name="contentType">The Content-Type header for the response</param>
-    internal ContentHttpResult(string? content, string? contentType, int? statusCode)
+    public ContentHttpResult(string? content, string? contentType, int? statusCode)
    {
        ResponseContent = content;
        StatusCode = statusCode;
        ContentType = contentType;
    }

## Usage Examples
```csharp
public override void OnActionExecuting(ActionExecutingContext context)
{
    if (lost session cookie)
    {
        if (context.HttpContext.Request.Method == "GET")
        {
              context.Result = new RedirectResult("/" /* login page */, false);
              return;
        } else {
             // Here's the new call
             context.Result = new ContentHttpResult("{\"error\":\"session expired in ajax call\"}", "application/json", 403);
             return;
       }
    }
}
-->

## Alternative Designs

````diff
+    public static ActionResult Create (string? content, string? contentType, int? statusCode) {/*...*/}

Risks

Less risk than not having it having to deal with weird implementations of IActionResult.

[BrennanConroy]

Does TypedResults.Text(...) provide what you want?

[jhudsoncedaron]

@BrennanConroy : No. But I messed up writing this API request as it doesn't work either.