C#发送Get/Post请求的3种方式_c# get post

一、HttpClient发送请求

1、发送Get请求

// 请求地址：url
using(var client = new HttpClient())
{
	var response = await client.GetStringAsync(url);
		
	return response;
}
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2、发送Post请求

// 格式：application/json
using(var client = new HttpClient())
{
	var response = await client.PostAsync(url, new StringContent(json, Encoding.UTF8, "application/json"));
	var content = response.Content.ReadAsStringAsync();
		
	return content;
}	

// 格式：x-www-form-urlencoded
using(var client = new HttpClient())
{
	var form = new Dictionary<string, string>();
	form.Add("name", "jerry")
	form.Add("password", "123");
	var response = await client.PostAsync(url, new FormUrlEncodedContent(form));
	var content = response.Content.ReadAsStringAsync();
		
	return content;
}

// 格式：multipart/form-data
	

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二、WebClient发送请求

1、发送Get请求

/// <summary>
/// Get请求
/// </summary>
/// <param name="url">请求地址</param>

public string Get(string url)
{
	using(var client = new WebClient())
	{
		var response = client.DownloadString(url);

		return response;
	}
}
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三、HttpWebRequest发送请求

1、发送Get请求

/// <summary>
/// Get请求
/// </summary>
/// <param name="url">请求地址</param>

public string Get(string url)
{
	var request = (HttpWebRequest)WebRequest.Create(url);
	using(var response = (HttpWebResponse)request.GetResponse())
	{
		if(response.StatusCode == HttpStatusCode.OK)
		{
			using(var reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
			{
				var content = reader.ReadToEnd();
					
				return content;
			}
		}
	}
}
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注意：在asp.net项目中，使用https发送请求前必须设置：SecurityProtocol，否则会报错：

1. 请求被中止: 未能创建 SSL/TLS 安全通道，
2. 或基础连接已经关闭: 发送时发生错误。

// asp.net发送请求前必须设置：SecurityProtocol

ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;
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