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正确使用 HttpClient

正确使用 HttpClient

使用 HttpClient 注意事项

  1. HttpClient默认最大并发连接数是2
  2. 本机测试(被请求的WebApi部署在本机)HttpClient不会被限制最大并发连接数
  3. 使用HttpClient要写个工厂类,因为HttpClient不能频繁创建
  4. HttpClient类提供的方法是线程安全的

HttpClient 工厂类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Factory
{
/// <summary>
/// HttpClient工厂类
/// 注意:
/// 1. HttpClient默认最大并发连接数是2
/// 2. 本机测试HttpClient不会被限制最大并发连接数
/// </summary>
public class HttpClientFactory
{
private int _httpClientCount;

private readonly HttpClient[] _httpClientArray;

private int _index = -1;

private readonly object _lock = new object();

private static readonly HttpClientFactory _instance = new HttpClientFactory();

public static HttpClientFactory Instance
{
get
{
return _instance;
}
}

public HttpClientFactory(int httpClientCount = 50)
{
_httpClientCount = httpClientCount;
_httpClientArray = new HttpClient[_httpClientCount];
for (int i = 0; i < _httpClientCount; i++)
{
_httpClientArray[i] = new HttpClient();
}
}

public HttpClient Get()
{
lock (_lock)
{
_index++;
if (_index == _httpClientCount)
{
_index = 0;
}
return _httpClientArray[_index];
}
}
}
}

如何使用

string url = "http://192.168.31.11:5028/Test/Get";
HttpClient httpClient = HttpClientFactory.Instance.Get();
string strResult = await (await httpClient.GetAsync(url)).Content.ReadAsStringAsync();



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