C#示例使用说明

该示例适用于C#编程语言，可以调用所有OpenAPI接口。示例封装了执行集成的过程，包括添加和验证调用支付网关API的签名。这只是一个例子，我们不保证代码适用于任何编程环境。它只是演示如何调用我们的API。您可以参考此代码来编写自己的程序。

使用条件

适用于符合的各种Microsoft框架。Net Standard 2.0规范（如.Net Framework>=4.6.1、.Net Core>=2.0等）。

下载地址

• GitHub项目主页

使用步骤

1. 添加依赖项并使用NuGet等工具下载以下包

<ItemGroup>
    <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
  </ItemGroup>

Newtonsoft.Json 解析和处理Json数据包的工具。

2. 请参阅GitHub示例代码并编写您的程序，以下是主要代码：

    // 1. Global parameter settings
    string appRsaPrivateKeyPem = "<YOUR APP RSA PRIVATE KEY>";
    string gatewayRsaPublicKeyPem = "<YOUR GATEWAY RSA PUBLIC KEY>";
    string gatewayUrl = "<YOUR GATEWAY URL>";
    string appId = "<YOUR APP ID>";

    // 2. Set parameters
    Dictionary<string, string> parameters = new Dictionary<string, string>();
        // Common parameters
    parameters.Add("app_id", appId);
    parameters.Add("charset", "UTF-8");
    parameters.Add("format", "JSON");
    parameters.Add("sign_type", "RSA2");
    parameters.Add("version", "1.0");
    parameters.Add("timestamp", "" + DateTimeOffset.Now.ToUnixTimeMilliseconds());
    parameters.Add("method", "order.query");
        // API owned parameters
    parameters.Add("merchant_no", "312100000164");
    parameters.Add("merchant_order_no", "TEST_1685946062143");

    // 3. Build a string to be signed
    string stringToBeSigned = buildToBeSignString(parameters);
    Console.WriteLine("StringToBeSigned : {0} \n", stringToBeSigned);

    // 4. Calculate signature
    string sign = GenerateSign(stringToBeSigned, appRsaPrivateKeyPem);
    parameters.Add("sign", sign);

    // 5. Send HTTP request
    string jsonString = JsonConvert.SerializeObject(parameters);
    
    Console.WriteLine("Request to gateway[" + gatewayUrl + "] send data  -->> " + jsonString + "\n");

    var responseStr = "";
    try{
        var httpClient = new HttpClient();
        httpClient.DefaultRequestHeaders.Accept.Clear();
        httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
        var response = httpClient.PostAsync(gatewayUrl, new StringContent(jsonString, Encoding.UTF8, "application/json")).Result;
        if (response.IsSuccessStatusCode){
            responseStr = response.Content.ReadAsStringAsync().Result;
            Console.WriteLine("Response from gateway[" + gatewayUrl + "] receive data <<-- " + responseStr + "\n");
        }
        else{
            Console.WriteLine("Request to gateway[" + gatewayUrl + "] failed: " + response);
            return;
        }
    }catch (Exception ex){
        Console.WriteLine("Request exception: " + ex.Message);
    }

    // 6. Verify the signature of the response message
    Dictionary<string, string> respParameters = JsonConvert.DeserializeObject<Dictionary<string, string>>(responseStr);
    string respStringToBeSigned = buildToBeSignString(respParameters);
    Console.WriteLine("RespStringToBeSigned : {0} \n", respStringToBeSigned);
    string respSignature = respParameters["sign"];
    bool verified = VerifySignature(respStringToBeSigned, respSignature, gatewayRsaPublicKeyPem);
    Console.WriteLine("SignVerifyResult : {0}", verified);