C#使用HttpClient

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C#使用HttpClient

這篇介紹在C#上使用HttpClient

Restful API: GET

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private static readonly string DefaultMediaType = "application/json";

public static byte[] GET(string url, NameValueCollection values, int timeOut)
{
	try
	{
		if (values != null)
		{
			url = url + "?" + ToQueryString(values);
		}

		byte[] result = null;
		using (var client = new HttpClient())
		{
			client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue(DefaultMediaType));
			client.Timeout = TimeSpan.FromMilliseconds(timeOut);
			result = client.GetByteArrayAsync(url).Result;
			string str = Encoding.Default.GetString(result);
			Console.WriteLine(str);
		}
		return result;
	}
	catch (Exception ex)
	{
		LogUtil.logger.Error("Get failed:" + url);
		LogUtil.logger.Error(Convert.ToString(ex));
		return null;
	}
}
private static string ToQueryString(NameValueCollection col)
{
	return string.Join("&", col.AllKeys.Select(key => string.Format("{0}={1}", HttpUtility.UrlEncode(key), HttpUtility.UrlEncode(col[key]))));
}
private static IDictionary<string, string> ToDictionary(this NameValueCollection source)
{
	return source.AllKeys.ToDictionary(k => k, k => source[k]);
}

Restful API: POST

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private static readonly string DefaultMediaType = "application/json";

public static string POST(string url, NameValueCollection values, int timeOut)
{
	string result = "";
	try
	{
		using (var client = new HttpClient())
		{
			client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue(DefaultMediaType));
			client.Timeout = TimeSpan.FromMilliseconds(timeOut);
			HttpContent contentPost = null;
			if (values != null)
			{
				var json = JsonConvert.SerializeObject(values.ToDictionary());
				contentPost = new StringContent(json, Encoding.UTF8, DefaultMediaType);
			}

			ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };
			ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls;

			HttpResponseMessage response = client.PostAsync(url, contentPost).GetAwaiter().GetResult();
			result = response.Content.ReadAsStringAsync().GetAwaiter().GetResult();
		}
	}
	catch(Exception ex)
	{
		LogUtil.logger.Error("Post failed:" + url);
		LogUtil.logger.Error(Convert.ToString(ex));
	}
	return result;
}

private static IDictionary<string, string> ToDictionary(this NameValueCollection source)
{
	return source.AllKeys.ToDictionary(k => k, k => source[k]);
}