C# .NET 利用 HttpWebRequest 模拟浏览器 http、https 请求。

/// <summary>
/// Http 请求
/// </summary>
/// <param name="url">url地址</param>
/// <param name="data">请求参数(可选参数)</param>
/// <param name="method">请求方法(可选参数,默认:GET)</param>
/// <param name="timeout">连接超时(可选参数,默认: 100,000 毫秒(100 秒))</param>
/// <param name="encoding">编码(可选参数,默认:utf-8)</param>
/// <param name="contentType">Content-type HTTP 标头(可选参数)</param>
/// <param name="userAgent">模拟浏览器UA(可选参数)</param>
/// <param name="headers">HTTP 标头(可选参数)</param>
/// <returns>远程服务器返回的数据</returns>
public static string HttpRequest(string url, string data = null, string method = "GET", int? timeout = null, Encoding encoding = null, string contentType = "application/x-www-form-urlencoded", string userAgent = null, Dictionary<string, string> headers = null)
{
	encoding = encoding ?? Encoding.UTF8;
	var myWebRequest = (HttpWebRequest)WebRequest.Create(url);
	myWebRequest.ContentType = contentType;
	myWebRequest.Method = method;
	if (!string.IsNullOrWhiteSpace(userAgent))
	{
		myWebRequest.UserAgent = userAgent;
	}
	if (timeout.HasValue)
	{
		myWebRequest.Timeout = timeout.Value;
	}
	if (myWebRequest.RequestUri.Scheme == "https")
	{
		myWebRequest.ProtocolVersion = HttpVersion.Version11;
		myWebRequest.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CertificateValidationCallback);
		// 这里设置了协议类型。
		ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;// SecurityProtocolType.Tls1.2; 
		myWebRequest.KeepAlive = false;
		ServicePointManager.CheckCertificateRevocationList = true;
		ServicePointManager.DefaultConnectionLimit = 100;
		ServicePointManager.Expect100Continue = false;
	}
	if (headers != null && headers.Count > 0)
	{
		foreach (KeyValuePair<string, string> item in headers)
		{
			myWebRequest.Headers[item.Key] = item.Value;
		}
	}
	try
	{
		if (!string.IsNullOrWhiteSpace(data))
		{
			using (Stream stream = myWebRequest.GetRequestStream())
			{
				var bytes = encoding.GetBytes(data);
				stream.Write(bytes, 0, bytes.Length);
				stream.Flush();
			}
		}
		using (HttpWebResponse myWebResponse = (HttpWebResponse)myWebRequest.GetResponse())
		{
			if (myWebResponse.StatusCode == HttpStatusCode.OK)
			{
				using (Stream receiveStream = myWebResponse.GetResponseStream())
				{
					using (StreamReader readStream = new StreamReader(receiveStream, Encoding.UTF8))
					{
						return readStream.ReadToEnd();
					}
				}
			}
			else
			{
				throw new WebException(myWebResponse.StatusDescription);
			}
		}
	}
	catch (Exception ex)
	{
		throw ex;
	}
	finally
	{
		myWebRequest.Abort();
	}
}
/// <summary>
/// (SSL) 证书验证回调
/// </summary>
/// <param name="sender">一个对象,它包含此验证的状态信息。</param>
/// <param name="certificate">用于对远程方进行身份验证的证书。</param>
/// <param name="chain">与远程证书关联的证书颁发机构链。</param>
/// <param name="sslPolicyErrors">与远程证书关联的一个或多个错误。</param>
/// <returns>是否接受指定证书进行身份验证</returns>
private static bool CertificateValidationCallback(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
{
	if (sslPolicyErrors == SslPolicyErrors.None)
		return true;

	Console.WriteLine("Certificate error: {0}", sslPolicyErrors);
	return false;
}

IP地址转数字

public long IPToNumber(string ip)
{
	string[] arrayIP = ip.Split('.');
	long sip1 = long.Parse(arrayIP[0]);
	long sip2 = long.Parse(arrayIP[1]);
	long sip3 = long.Parse(arrayIP[2]);
	long sip4 = long.Parse(arrayIP[3]);
	long ipNum = sip1 * 256 * 256 * 256 + sip2 * 256 * 256 + sip3 * 256 + sip4;
	return ipNum;
}

数字转IP地址

public string NumberToIP(long ipNum)
{
	StringBuilder builder = new StringBuilder();
	builder.Append((ipNum >> 24) & 0xFF).Append(".");
	builder.Append((ipNum >> 16) & 0xFF).Append(".");
	builder.Append((ipNum >> 8) & 0xFF).Append(".");
	builder.Append(ipNum & 0xFF);
	return builder.ToString();
}

using System;
using System.Data.SqlTypes;
using System.IO;
using System.Xml;
using System.Xml.Serialization;

namespace utility
{
    /// <summary>
    /// Xml序列化与反序列化
    /// </summary>
    public class XmlUtil
    {
        /// <summary>
        /// 反序列化
        /// </summary>
        /// <param name="xml">XML字符串</param>
        /// <returns></returns>
        public static T Deserialize<T>(string xml) where T : new()
        {
            try
            {
                using (Stream sr = new FileStream(xml, FileMode.Open))
                {
                    XmlSerializer xmldes = new XmlSerializer(typeof(T));
                    return (T)xmldes.Deserialize(sr);
                }
            }
            catch
            {
                return default(T);
            }
        }
		
        /// <summary>
        /// 序列化
        /// </summary>
        /// <param name="obj">对象</param>
        /// <returns></returns>
        public static string Serializer<T>(T obj)
        {
            using (MemoryStream Stream = new MemoryStream())
            {
                XmlSerializer xml = new XmlSerializer(typeof(T));
                try
                {
                    //序列化对象
                    xml.Serialize(Stream, obj);
                }
                catch (InvalidOperationException)
                {
                    throw;
                }
                Stream.Position = 0;
                using (StreamReader sr = new StreamReader(Stream))
                {
                    return sr.ReadToEnd();
                }
            }
        }
    }
}

//源Execl名称
string sourceExeclFileName = "C:\\SourceExecl.xlsx";
//目标Execl名称
string targetExeclFileName = "C:\\TargetExecl.xlsx";
using (ExcelPackage package = new ExcelPackage(new FileInfo(targetExeclFileName)))
{
	using (ExcelPackage sourcePackage = new ExcelPackage(new FileInfo(sourceExeclFileName)))
	{
		//new sheet form copy为复制到目标Execl的SheetName
		package.Workbook.Worksheets.Add("new sheet from copy", sourcePackage.Workbook.Worksheets[1]);
	}
	package.Save();
}

/// <summary>
/// 获取日期是第几周
/// </summary>
/// <param name="date">日期</param>
/// <returns>第几周</returns>
public static int GetWeekOfYear(DateTime date)
{
	//确定此时间在一年中的位置
	int dayOfYear = date.DayOfYear;
	//当年第一天
	DateTime tempDate = new DateTime(date.Year, 1, 1);
	//确定当年第一天
	int tempDayOfWeek = (int)tempDate.DayOfWeek;
	tempDayOfWeek = tempDayOfWeek == 0 ? 7 : tempDayOfWeek;
	//确定星期几
	int index = (int)date.DayOfWeek;
	index = index == 0 ? 7 : index;
	//当前周的范围
	DateTime retStartDay = date.AddDays(-(index - 1));
	DateTime retEndDay = date.AddDays(7 - index);
	//确定当前是第几周
	int weekOfYear = (int)Math.Ceiling(((double)dayOfYear + tempDayOfWeek - 1) / 7);
	if (retStartDay.Year < retEndDay.Year)
	{
		weekOfYear = 1;
	}
	return weekOfYear;
}

注意:.NET Core仅支持64位系统。

1、添加 dotnet repos

在安装.NET之前,需要注册 Microsoft key,注册 repos 并安装所需的依赖项。

打开 terminal 并运行以下命令:

sudo rpm -Uvh https://packages.microsoft.com/config/rhel/7/packages-microsoft-prod.rpm

2、 安装 .NET SDK

在 terminal 中,运行以下命令:

sudo yum update
sudo yum install dotnet-sdk-2.2

官方英文原文:https://dotnet.microsoft.com/download/linux-package-manager/centos/sdk-current

Ubuntu 16.04 或更高版本安装 .NET Core SDK,需要注意的是.NET Core仅支持 16.04 或更高版本的 64位系统。

1、注册 Microsoft key和 repos

在安装.NET之前,需要注册 Microsoft key,注册 repos 并安装所需的依赖项。

打开 terminal 并运行以下命令:

wget -q https://packages.microsoft.com/config/ubuntu/16.04/packages-microsoft-prod.deb
sudo dpkg -i packages-microsoft-prod.deb

2、 安装 .NET SDK

在 terminal 中,运行以下命令:

sudo apt-get install apt-transport-https
sudo apt-get update
sudo apt-get install dotnet-sdk-2.2

如果出现Unable to locate package dotnet-sdk-2.2错误,运行以下命令:

sudo dpkg --purge packages-microsoft-prod && sudo dpkg -i packages-microsoft-prod.deb
sudo apt-get update
sudo apt-get install dotnet-sdk-2.2

如果还没有安装成功,可以尝试以下命令运行手动安装:

sudo apt-get install -y gpg
wget -qO- https://packages.microsoft.com/keys/microsoft.asc | gpg --dearmor > microsoft.asc.gpg
sudo mv microsoft.asc.gpg /etc/apt/trusted.gpg.d/
wget -q https://packages.microsoft.com/config/ubuntu/18.04/prod.list
sudo mv prod.list /etc/apt/sources.list.d/microsoft-prod.list
sudo chown root:root /etc/apt/trusted.gpg.d/microsoft.asc.gpg
sudo chown root:root /etc/apt/sources.list.d/microsoft-prod.list
sudo apt-get install -y apt-transport-https
sudo apt-get update
sudo apt-get install dotnet-sdk-2.2

官方英文原文:https://dotnet.microsoft.com/download/linux-package-manager/ubuntu18-04/sdk-current