尝试解析为 JSON 对象时出错答案

【问题标题】：Get error while trying to parse into a JSON object尝试解析为 JSON 对象时出错
【发布时间】：2023-02-25 20:12:42
【问题描述】：

我想构建一个支付 API，但我总是收到以下错误：

{“解析值时遇到意外字符：e.Path ''，第 0 行，位置 0。”}

代码如下所示：

var priceAmount = txtBoxTopUpBalance.Text;
            

var client = new RestClient("https://api.nowpayments.io/v1/invoice");
client.Timeout = -1;
var request1 = new RestRequest(Method.POST);
request1.AddHeader("x-api-key", apiKey);
request1.AddHeader("Content-Type", "application/json");
var body = @"{" + "\n" +
    @"  ""price_amount"":" + priceAmount + "\n" +
    @"  ""price_currency"": ""usd""," + "\n" +
    @"  ""order_id"": ""RGDBP-21314""," + "\n" +
    @"  ""order_description"": ""order #1""," + "\n" +
    @"  ""ipn_callback_url"": ""https://nowpayments.io""," + "\n" +
    @"  ""success_url"": ""https://nowpayments.io""," + "\n" +
    @"  ""cancel_url"": ""https://nowpayments.io""" + "\n" +
    @"}" + "\n" +
    @"" + "\n" +
    @"";
request1.AddParameter("application/json", body, ParameterType.RequestBody);
IRestResponse response1 = client.Execute(request1);

JObject responseObject = JObject.Parse(response1.Content); // <--The error occurs here
invoiceUrl = responseObject["invoice_url"].ToString();

问题是“正文”无法解析为 JSON 对象。

当我删除 priceAmount var 时它起作用了，但这是必要的。

我还是个初学者，你有什么想法吗？

【问题讨论】：

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标签： c# json parsing serialization

【解决方案1】：

不要手动构建（序列化）JSON。很有可能会遇到语法错误，例如缺少引号、缺少左/右大括号等。

使用 JSON 库，例如系统.Text.Json或者牛顿软件.Json序列化为 JSON。

在示例 NOWPayments API Create Invoice documentation 中，您应该将 price_amount 作为数字类型传递。

using System.Text.Json;

var body = JsonSerializer.Serialize(new
{
    price_amount = decimal.Parse(priceAmount),
    price_currency = "usd",
    order_id = "RGDBP-21314",
    order_description = "order #1",
    ipn_callback_url = "https://nowpayments.io",
    success_url = "https://nowpayments.io",
    cancel_url = "https://nowpayments.io"
});

或者

using Newtonsoft.Json;

var body = JsonConvert.SerializeObject(new
{
    price_amount = decimal.Parse(priceAmount),
    price_currency = "usd",
    order_id = "RGDBP-21314",
    order_description = "order #1",
    ipn_callback_url = "https://nowpayments.io",
    success_url = "https://nowpayments.io",
    cancel_url = "https://nowpayments.io"
});

【讨论】：

【解决方案2】：

你有错字，需要在 priceAmount 之后加上“,”，但恕我直言，最好使用这种语法

    var client = new RestClient("https://api.nowpayments.io/");
    RestRequest request = new RestRequest("v1/invoice",Method.Post);
    request.AddHeader("Accept", "application/json");
    request.RequestFormat = DataFormat.Json;

    var body = new
    {
        price_amount = decimal.Parse(priceAmount),
        price_currency = "usd",
        order_id = "RGDBP-21314",
        order_description = "order #1",
        ipn_callback_url = "https://nowpayments.io",
        success_url = "https://nowpayments.io",
        cancel_url = "https://nowpayments.io"
    };
    request.AddJsonBody(body);

    var response = client.Execute(request).Content;
JObject responseObject = JObject.Parse(response);
var invoiceUrl = responseObject["invoice_url"].ToString();

【讨论】：