发送JSON数组ASHX处理程序

问题描述

我有这样的code和当我执行它这种不断显示了同样的错误：无效的JSON原始：标题

I have this code, and when i'm executing it this keeps showing the same error: Invalid JSON primitive: titles.

客户端：

        var title = new Array();

        ...

        for (var i = 0; i < names.length; ++i) {
            title[i] = '{ "titulo' + i + ':"' + names[i] + '"}';
        }

        $("#gif").show();

        $.ajax({
            async: true,
            contentType: 'application/json; charset=utf-8',
            dataType: 'json',
            type: "POST",
            data: { titles: title },
            url: "../handlers/saveUpload.ashx",
            success: function (msg) {
                $("#gif").hide();
            }
        });

服务器端：

        context.Response.ContentType = "application/json";
        var data = context.Request;
        var sr = new StreamReader(data.InputStream);
        var stream = sr.ReadToEnd();

        var javaScriptSerializer = new JavaScriptSerializer();

        var arrayOfStrings = javaScriptSerializer.Deserialize<string[]>(stream);

        foreach (var item in arrayOfStrings)
        {
            context.Response.Write(item);
        }

问候

推荐答案

解决了这个帖子：convert数组JSON和在ashx的处理程序收到

字符串[]是不是有效的泛型类型为操作;字符串没有参数的构造函数所以当串行器尝试了新一轮上涨，它失败。此外，你已经从sr.ReadToEnd（字符串），所以你没有真正deserialising，它更像是你问它来解析和分割字符串你，它不能做。

的JavaScriptSerializer是pretty无情的，老实说我最后总是试图deserialise这样的一个阵列时撕裂我的头发......你是好得多在服务器端定义DTO类来处理映射

JavaScriptSerializer is pretty unforgiving and to be honest I always end up tearing my hair out when trying to deserialise an array like this...you are much better off defining a DTO class on the server side to handle the mapping:

 [Serializable]
 public class Titles
 {
    public List<Title> TheTitles { get; set; }
 }

 [Serializable]
 public class Title
 {
    public string title { get; set; }
 }

所以，现在你的处理程序是这样的：

So now your handler looks like this:

 public void ProcessRequest(HttpContext context)
        {
            try
            {
                context.Response.ContentType = "application/json";
                var data = context.Request;
                var sr = new StreamReader(data.InputStream);
                var stream = sr.ReadToEnd();
                var javaScriptSerializer = new JavaScriptSerializer();
                var PostedData = javaScriptSerializer.Deserialize<Titles>(stream);
                foreach (var item in PostedData.TheTitles )
                {
                   //this will write SteveJohnAndrew as expected in the response
                   //(check the console!)
                   context.Response.Write(item.title);
                }
            }
            catch (Exception msg) { context.Response.Write(msg.Message); }
        }

和您的AJAX是这样的：

And your AJAX is like this:

 function upload()
        {
           //example data
            var Titles = [
                {'title':'Steve'}, {'title':'John'}, {'title':'Andrew'}
            ];
            var myJSON = JSON.stringify({ TheTitles: Titles });
            console.log(myJSON);
            $.ajax({
                async: true,
                contentType: 'application/json; charset=utf-8',
                dataType: 'json',
                type: "POST",
                data: myJSON,
                url: "jsonhandler.ashx",
                success: function (msg) {
                    console.log(msg);
                }
            });
        }

请注意的DTO类的定义如何JSON对象属性的完全定义相匹配，如果它不那么deserialisation将无法工作。

Note how the definition of the DTO classes matches exactly the definition of the JSON object properties, if it doesn't then the deserialisation will not work.

希望有所帮助。

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