ReasonPhrases as switch instead of Dictionary

Author: WhatzGames

src/Http/WebUtilities/src/ReasonPhrases.cs

@@ -9,85 +9,83 @@ namespace Microsoft.AspNetCore.WebUtilities;
 /// </summary>
 public static class ReasonPhrases
 {
-    // Status Codes listed at http://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml
-    private static readonly Dictionary<int, string> Phrases = new()
-    {
-        { 100, "Continue" },
-        { 101, "Switching Protocols" },
-        { 102, "Processing" },
-
-        { 200, "OK" },
-        { 201, "Created" },
-        { 202, "Accepted" },
-        { 203, "Non-Authoritative Information" },
-        { 204, "No Content" },
-        { 205, "Reset Content" },
-        { 206, "Partial Content" },
-        { 207, "Multi-Status" },
-        { 208, "Already Reported" },
-        { 226, "IM Used" },
-
-        { 300, "Multiple Choices" },
-        { 301, "Moved Permanently" },
-        { 302, "Found" },
-        { 303, "See Other" },
-        { 304, "Not Modified" },
-        { 305, "Use Proxy" },
-        { 306, "Switch Proxy" },
-        { 307, "Temporary Redirect" },
-        { 308, "Permanent Redirect" },
-
-        { 400, "Bad Request" },
-        { 401, "Unauthorized" },
-        { 402, "Payment Required" },
-        { 403, "Forbidden" },
-        { 404, "Not Found" },
-        { 405, "Method Not Allowed" },
-        { 406, "Not Acceptable" },
-        { 407, "Proxy Authentication Required" },
-        { 408, "Request Timeout" },
-        { 409, "Conflict" },
-        { 410, "Gone" },
-        { 411, "Length Required" },
-        { 412, "Precondition Failed" },
-        { 413, "Payload Too Large" },
-        { 414, "URI Too Long" },
-        { 415, "Unsupported Media Type" },
-        { 416, "Range Not Satisfiable" },
-        { 417, "Expectation Failed" },
-        { 418, "I'm a teapot" },
-        { 419, "Authentication Timeout" },
-        { 421, "Misdirected Request" },
-        { 422, "Unprocessable Entity" },
-        { 423, "Locked" },
-        { 424, "Failed Dependency" },
-        { 426, "Upgrade Required" },
-        { 428, "Precondition Required" },
-        { 429, "Too Many Requests" },
-        { 431, "Request Header Fields Too Large" },
-        { 451, "Unavailable For Legal Reasons" },
-        { 499, "Client Closed Request" },
-
-        { 500, "Internal Server Error" },
-        { 501, "Not Implemented" },
-        { 502, "Bad Gateway" },
-        { 503, "Service Unavailable" },
-        { 504, "Gateway Timeout" },
-        { 505, "HTTP Version Not Supported" },
-        { 506, "Variant Also Negotiates" },
-        { 507, "Insufficient Storage" },
-        { 508, "Loop Detected" },
-        { 510, "Not Extended" },
-        { 511, "Network Authentication Required" },
-    };
 
     /// <summary>
     /// Gets the reason phrase for the specified status code.
     /// </summary>
     /// <param name="statusCode">The status code.</param>
     /// <returns>The reason phrase, or <see cref="string.Empty"/> if the status code is unknown.</returns>
-    public static string GetReasonPhrase(int statusCode)
+    public static string GetReasonPhrase(int statusCode) => statusCode switch
     {
-        return Phrases.TryGetValue(statusCode, out var phrase) ? phrase : string.Empty;
-    }
+        // Status Codes listed at http://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml
+        100 => "Continue",
+        101 => "Switching Protocols",
+        102 => "Processing",
+
+        200 => "OK",
+        201 => "Created",
+        202 => "Accepted",
+        203 => "Non-Authoritative Information",
+        204 => "No Content",
+        205 => "Reset Content",
+        206 => "Partial Content",
+        207 => "Multi-Status",
+        208 => "Already Reported",
+        226 => "IM Used",
+
+        300 => "Multiple Choices",
+        301 => "Moved Permanently",
+        302 => "Found",
+        303 => "See Other",
+        304 => "Not Modified",
+        305 => "Use Proxy",
+        306 => "Switch Proxy",
+        307 => "Temporary Redirect",
+        308 => "Permanent Redirect",
+
+        400 => "Bad Request",
+        401 => "Unauthorized",
+        402 => "Payment Required",
+        403 => "Forbidden",
+        404 => "Not Found",
+        405 => "Method Not Allowed",
+        406 => "Not Acceptable",
+        407 => "Proxy Authentication Required",
+        408 => "Request Timeout",
+        409 => "Conflict",
+        410 => "Gone",
+        411 => "Length Required",
+        412 => "Precondition Failed",
+        413 => "Payload Too Large",
+        414 => "URI Too Long",
+        415 => "Unsupported Media Type",
+        416 => "Range Not Satisfiable",
+        417 => "Expectation Failed",
+        418 => "I'm a teapot",
+        419 => "Authentication Timeout",
+        421 => "Misdirected Request",
+        422 => "Unprocessable Entity",
+        423 => "Locked",
+        424 => "Failed Dependency",
+        426 => "Upgrade Required",
+        428 => "Precondition Required",
+        429 => "Too Many Requests",
+        431 => "Request Header Fields Too Large",
+        451 => "Unavailable For Legal Reasons",
+        499 => "Client Closed Request",
+
+        500 => "Internal Server Error",
+        501 => "Not Implemented",
+        502 => "Bad Gateway",
+        503 => "Service Unavailable",
+        504 => "Gateway Timeout",
+        505 => "HTTP Version Not Supported",
+        506 => "Variant Also Negotiates",
+        507 => "Insufficient Storage",
+        508 => "Loop Detected",
+        510 => "Not Extended",
+        511 => "Network Authentication Required",
+        
+        _ => string.Empty
+    };
 }