Question

我想从控制器调用WebAPI。我也想从控制器传递多个json参数。那么，如何使用api绑定数据？

 var jsonData = "{\"jsonrpc\":2.0," +
                "\"method\":eth_blockNumber," +
                "\"params\":[]," +
                "\"id\":83}";

HttpWebRequest webreq = (HttpWebRequest)WebRequest.Create(string.Format("https://mainnet.infura.io/qhggowRXK7HIgXB0NEyw",jsonData));
webreq.Method = "POST";
webreq.ContentType = "application/json";
using (var streamWriter = new StreamWriter(webreq.GetRequestStream()))
{
    JavaScriptSerializer serializer = new JavaScriptSerializer();
    //var resToWrite = serializer.Deserialize<Dictionary<string, object>>(jsonData);
    //streamWriter.Write(jsonData);
    streamWriter.Flush();
    streamWriter.Close();
}
WebResponse response = webreq.GetResponse();
var streamReader = new StreamReader(response.GetResponseStream());
var result = streamReader.ReadToEnd();

Answer 1

您可以使用HttpClient：

private static readonly HttpClient client = new HttpClient();
var values = new Dictionary<string, string>
{
   { "param1", "value1" },
   { "param2", "value2" }
};
*var content = new FormUrlEncodedContent(values);
var response = await client.PostAsync("https://mainnet.infura.io/qhggowRXK7HIgXB0NEyw", content);
var responseString = await response.Content.ReadAsStringAsync();

或者，如果您不使用NET 4.5或更高版本，则使用WebClient：

using (var client = new WebClient())
{
    var values = new NameValueCollection();
    values["thing1"] = "hello";
    values["thing2"] = "world";

    var response = client.UploadValues("http://www.example.com/recepticle.aspx", values);

    var responseString = Encoding.Default.GetString(response);
}

Answer 2

您可以按如下所示简单地调用API：

using (var client = new HttpClient())
{
    client.BaseAddress = new Uri("https://mainnet.infura.io/qhggowRXK7HIgXB0NEyw");
    client.DefaultRequestHeaders.Clear();
    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

    var requestBody = new
    {
        jsonrpc = "2.0",
        method = "eth_blockNumber",
        @params = new int[]{},
        id = 83,
    };

    HttpResponseMessage apiResponse = await client.PostAsJsonAsync(client.BaseAddress, requestBody);

    if (apiResponse.IsSuccessStatusCode)
    {
        var documentResponse = await apiResponse.Content.ReadAsStringAsync();
        dynamic response = JsonConvert.DeserializeObject(documentResponse);
    }                
}

需要添加Http.Formatting.Extension的nuget包：

Install-Package System.Net.Http.Formatting.Extension

侧面说明：您将在动态变量中获得响应，此外，您还可以在模型中反序列化响应，而该响应未包括在内。

如何从C＃MVC控制器使用多个JSON参数调用API

2 个答案: