HttpClient PostAsync

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一、PostAsync 範例

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using Newtonsoft.Json;
using System.Net.Http.Headers;
using System.Text;

namespace ConsoleApp1
{
    class Program
    {
        static async Task Main(string[] args)
        {
            using (HttpClient client = new HttpClient())
            {
                //1、FromQuery
                try
                {
                    string url = "https://localhost:7155/WeatherForecast/ToFromQuery?Name=Mary&Age=30";
                    HttpResponseMessage response = await client.PostAsync(url, null);
                    response.EnsureSuccessStatusCode();
                    string responseBody = await response.Content.ReadAsStringAsync();
                    Console.WriteLine(responseBody);
                }
                catch (HttpRequestException e)
                {
                    Console.WriteLine("\nException Caught!");
                    Console.WriteLine("MessAge :{0} ", e.Message);
                }

                //FromBody
                try
                {
                    //2、StringContent
                    var stringContent = new StringContent($@"{{""name"":""Mary"",""Age"":30}}");
                    stringContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");

                    string url = "https://localhost:7155/WeatherForecast/ToFromBody";
                    HttpResponseMessage response = await client.PostAsync(url, stringContent);
                    response.EnsureSuccessStatusCode();
                    string responseBody = await response.Content.ReadAsStringAsync();
                    Console.WriteLine(responseBody);

                    //3、ByteArrayContent
                    string content = JsonConvert.SerializeObject(new { Name = "Bill", Age = 13 });
                    var buffer = Encoding.UTF8.GetBytes(content);
                    var byteContent = new ByteArrayContent(buffer);
                    byteContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");

                    string url2 = "https://localhost:7155/WeatherForecast/ToFromBody";
                    HttpResponseMessage response2 = await client.PostAsync(url2, byteContent);
                    response2.EnsureSuccessStatusCode();
                    string responseBody2 = await response2.Content.ReadAsStringAsync();
                    Console.WriteLine(responseBody2);

                    //4、XML format
                    string str = "";
                    str += "<?xml version=\"1.0\" encoding=\"utf-8\"?>";
                    str += "<People>";
                    str += "   <Name>tim</Name>";
                    str += "   <Age>13</Age>";
                    str += "</People>";
                    var stringXmlContent = new StringContent(str);
                    stringXmlContent.Headers.ContentType = new MediaTypeHeaderValue("text/xml");

                    string url3 = "https://localhost:7155/WeatherForecast/ToFromBody";
                    HttpResponseMessage response3 = await client.PostAsync(url3, stringXmlContent);
                    response3.EnsureSuccessStatusCode();
                    string responseBody3 = await response3.Content.ReadAsStringAsync();
                    Console.WriteLine(responseBody3);
                }
                catch (HttpRequestException e)
                {
                    Console.WriteLine("\nException Caught!");
                    Console.WriteLine("MessAge :{0} ", e.Message);
                }
            }

        }
    }
}

說明：

Post 的方式有分以 FromQuery 或 FromBody 的型式來打 api，

而 FromBody 又可以分以 StringContent、ByteArrayContent、XML format 的型式來送資料。