c# - 如何使用转义为\u1234 的 unicode 字符返回 json 结果

Question

我正在实现一个返回 json 结果的方法，例如:

public JsonResult MethodName(Guid key){
    var result = ApiHelper.GetData(key); //Data is stored in db as varchar with åäö
    return Json(new { success = true, data = result },"application/json", Encoding.Unicode, JsonRequestBehavior.AllowGet );
}

显示结果:

{"success":true,"data":[{"Title":"Here could be characters like åäö","Link":"http://www.url.com/test",...},

但我想这样显示:

{"success":true,"data":[{"Title":"Here could be characters like \u00e5\u00e4\u00f6","Link":"http:\/\/www.url.com\/test",...},

我怎样才能做到这一点？我可以转换它、解析它或更改 web.config 中的 responseEncoding 以使其显示 unicode 字符吗？

Answer 1

如果客户端是网络浏览器，或者任何其他正确处理 http 的客户端，则不需要转义，只要您的服务器正确告知客户端内容类型和内容编码，并且您选择的编码支持代码点在传出数据中。

如果客户端的行为不正确，并且确实需要像这样转义字符串，则您将不得不编写自己的 ActionResult 类并自己进行转义。从继承 JsonResult 开始，并根据需要使用反射创建 JSON 文档。

这是一件苦差事!

编辑:这会让你开始

public class MyController : Controller {
    public JsonResult MethodName(Guid key){
        var result = ApiHelper.GetData(key);
        return new EscapedJsonResult(result);
    }
}

public class EscapedJsonResult<T> : JsonResult {
    public EscapedJsonResult(T data) {
        this.Data = data;
        this.JsonRequestBehavior = JsonRequestBehavior.AllowGet;
    }

    public override ExecuteResult(ControllerContext context) {
        var response = context.HttpContext.Response;

        response.ContentType = "application/json";
        response.ContentEncoding = Encoding.UTF8;

        var output = new StreamWriter(response.OutputStream);

        // TODO: Do some reflection magic to go through all properties
        // of the this.Data property and write JSON to the output stream
        // using the StreamWriter

        // You need to handle arrays, objects, possibly dictionaries, numbers,
        // booleans, dates and strings, and possibly some other stuff... All
        // by your self!
    }

    // Finds non-ascii and double quotes
    private static Regex nonAsciiCodepoints =
        new Regex(@"[""]|[^\x20-\x7f]");

    // Call this for encoding string values
    private static string encodeStringValue(string value) {
        return nonAsciiCodepoints.Replace(value, encodeSingleChar);
    }

    // Encodes a single character - gets called by Regex.Replace
    private static string encodeSingleChar(Match match) {
        return "\\u" + char.ConvertToUtf32(match.Value, 0).ToString("x4");
    }
}