IPAddress.Parse 方法

定义

命名空间:

System.Net

程序集:

System.Net.Primitives.dll

重载

Parse(String)	将 IP 地址字符串转换为 IPAddress 实例。
Parse(ReadOnlySpan<Char>)	将以字符范围表示的 IP 地址转换为 IPAddress 实例。

Parse(String)

Source:

IPAddress.cs

将 IP 地址字符串转换为 IPAddress 实例。

public:
 static System::Net::IPAddress ^ Parse(System::String ^ ipString);

public static System.Net.IPAddress Parse (string ipString);

static member Parse : string -> System.Net.IPAddress

Public Shared Function Parse (ipString As String) As IPAddress

参数

ipString

String

包含 IP 地址（IPv4 使用点分四组表示法，IPv6 使用冒号十六进制表示法）的字符串。

返回

IPAddress

一个 IPAddress 实例。

例外

ArgumentNullException

ipString 为 null。

FormatException

ipString 不是有效的 IP 地址。

示例

下面的代码将包含 IP 地址的字符串（对于 IPv4 使用点四表示法）或 IPv6 的冒号十六进制表示法转换为 类的 IPAddress 实例。 然后，它使用重载 ToString 方法以标准表示法显示地址。

#using <System.dll>

using namespace System;
using namespace System::Net;

// This method calls the IPAddress::Parse method to check the ipAddress
// input string. If the ipAddress argument represents a syntatically correct IPv4 or
// IPv6 address, the method displays the Parse output into quad-notation or
// colon-hexadecimal notation, respectively. Otherwise, it displays an
// error message.
void parse( String^ ipAddress )
{
   try
   {
      
      // Create an instance of IPAddress for the specified address string (in
      // dotted-quad, or colon-hexadecimal notation).
      IPAddress^ address = IPAddress::Parse( ipAddress );
      
      // Display the address in standard notation.
      Console::WriteLine( "Parsing your input string: \"{0}\" produces this address (shown in its standard notation): {1}", ipAddress, address );
   }
   catch ( ArgumentNullException^ e ) 
   {
      Console::WriteLine( "ArgumentNullException caught!!!" );
      Console::WriteLine( "Source : {0}", e->Source );
      Console::WriteLine( "Message : {0}", e->Message );
   }
   catch ( FormatException^ e ) 
   {
      Console::WriteLine( "FormatException caught!!!" );
      Console::WriteLine( "Source : {0}", e->Source );
      Console::WriteLine( "Message : {0}", e->Message );
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( "Exception caught!!!" );
      Console::WriteLine( "Source : {0}", e->Source );
      Console::WriteLine( "Message : {0}", e->Message );
   }

}

int main()
{
   array<String^>^args = Environment::GetCommandLineArgs();
   String^ IPaddress;
   if ( args->Length == 1 )
   {
      Console::WriteLine( "Please enter an IP address." );
      Console::WriteLine( "Usage:   >cs_parse any IPv4 or IPv6 address." );
      Console::WriteLine( "Example: >cs_parse 127.0.0.1" );
      Console::WriteLine( "Example: >cs_parse 0:0:0:0:0:0:0:1" );
      return 0;
   }
   else
      IPaddress = args[ 1 ];

   
   // Get the list of the IPv6 addresses associated with the requested host.
   parse( IPaddress );
}

using System;
using System.Net;

class ParseAddress
{

  private static void Main(string[] args)
  {
    string IPaddress;

    if (args.Length == 0)
    {
      Console.WriteLine("Please enter an IP address.");
      Console.WriteLine("Usage:   >cs_parse any IPv4 or IPv6 address.");
      Console.WriteLine("Example: >cs_parse 127.0.0.1");
      Console.WriteLine("Example: >cs_parse 0:0:0:0:0:0:0:1");
      return;
    }
    else
        {
            IPaddress = args[0];
        }

        // Get the list of the IPv6 addresses associated with the requested host.
        Parse(IPaddress);
  }

  // This method calls the IPAddress.Parse method to check the ipAddress
  // input string. If the ipAddress argument represents a syntatically correct IPv4 or
  // IPv6 address, the method displays the Parse output into quad-notation or
  // colon-hexadecimal notation, respectively. Otherwise, it displays an
  // error message.
  private static void Parse(string ipAddress)
  {
    try
    {
      // Create an instance of IPAddress for the specified address string (in
      // dotted-quad, or colon-hexadecimal notation).
      IPAddress address = IPAddress.Parse(ipAddress);

      // Display the address in standard notation.
      Console.WriteLine("Parsing your input string: " + "\"" + ipAddress + "\"" + " produces this address (shown in its standard notation): "+ address.ToString());
    }

    catch(ArgumentNullException e)
    {
      Console.WriteLine("ArgumentNullException caught!!!");
      Console.WriteLine("Source : " + e.Source);
      Console.WriteLine("Message : " + e.Message);
    }

    catch(FormatException e)
    {
      Console.WriteLine("FormatException caught!!!");
      Console.WriteLine("Source : " + e.Source);
      Console.WriteLine("Message : " + e.Message);
    }

    catch(Exception e)
    {
      Console.WriteLine("Exception caught!!!");
      Console.WriteLine("Source : " + e.Source);
      Console.WriteLine("Message : " + e.Message);
    }
   }
}

Imports System.Net



Class ParseAddress
   
   'Entry point which delegates to C-style main Private Function
   Public Overloads Shared Sub Main()
      Main(System.Environment.GetCommandLineArgs())
   End Sub
   
   
   Overloads Private Shared Sub Main(args() As String)
      Dim IPaddress As String
      
      If args.Length = 1 Then
         Console.WriteLine("Please enter an IP address.")
         Console.WriteLine("Usage:   >cs_parse any IPv4 or IPv6 address.")
         Console.WriteLine("Example: >cs_parse 127.0.0.1")
         Console.WriteLine("Example: >cs_parse 0:0:0:0:0:0:0:1")
         Return
      Else
         IPaddress = args(1)
      End If 
      ' Get the list of the IPv6 addresses associated with the requested host.
      Parse(IPaddress)
   End Sub
    
   
   ' This method calls the IPAddress.Parse method to check the ipAddress 
   ' input string. If the ipAddress argument represents a syntatical correct IPv4 or
   ' IPv6 address, the method displays the Parse output into quad-notation or
   ' colon-hexadecimal notation, respectively. Otherwise, it displays an 
   ' error message.
   Private Shared Sub Parse(ipAddr As String)
      Try
         ' Create an instance of IPAddress for the specified address string (in 
         ' dotted-quad, or colon-hexadecimal notation).
         Dim address As IPAddress = IPAddress.Parse(ipAddr)
         
         ' Display the address in standard notation.
         Console.WriteLine(("Parsing your input string: " + """" + ipAddr + """" + " produces this address (shown in its standard notation): " + address.ToString()))
      
      Catch e As ArgumentNullException
         Console.WriteLine("ArgumentNullException caught!!!")
         Console.WriteLine(("Source : " + e.Source))
         Console.WriteLine(("Message : " + e.Message))
      
      Catch e As FormatException
         Console.WriteLine("FormatException caught!!!")
         Console.WriteLine(("Source : " + e.Source))
         Console.WriteLine(("Message : " + e.Message))
      
      Catch e As Exception
         Console.WriteLine("Exception caught!!!")
         Console.WriteLine(("Source : " + e.Source))
         Console.WriteLine(("Message : " + e.Message))
      End Try
   End Sub
End Class

注解

静态 Parse 方法从 IPv4 的点象限表示法表示的 IP 地址和 IPv6 的冒号十六进制表示法创建 IPAddress 实例。

每个部件 (的部件数由) 中的 ipString 句点分隔，决定了 IP 地址的构造方式。 一部分地址直接存储在网络地址中。 两部分地址（方便指定 A 类地址）将前导部分放在第一个字节中，将尾随部分放在网络地址的最右侧三个字节中。 三部分地址（方便指定 B 类地址）将第一部分放在第一个字节中，第二部分放在第二个字节中，最后一部分放在网络地址最右边的两个字节中。 例如：

部件数和示例 ipString	IPAddress 的 IPv4 地址
1 -- "65535"	0.0.255.255
2 -- "20.2"	20.0.0.2
2 -- "20.65535"	20.0.255.255
3 -- "128.1.2"	128.1.0.2
4 -- "1.1.1.10"	1.1.1.10
4 -- "1.1.1.010"	1.1.1.8
1 -- “0x2F”	0.0.0.47

Parse(ReadOnlySpan<Char>)

Source:

IPAddress.cs

将以字符范围表示的 IP 地址转换为 IPAddress 实例。

public:
 static System::Net::IPAddress ^ Parse(ReadOnlySpan<char> ipSpan);

public static System.Net.IPAddress Parse (ReadOnlySpan<char> ipSpan);

static member Parse : ReadOnlySpan<char> -> System.Net.IPAddress

Public Shared Function Parse (ipSpan As ReadOnlySpan(Of Char)) As IPAddress

参数

ipSpan

ReadOnlySpan<Char>

包含 IP 地址（IPv4 使用点分四组表示法，IPv6 使用冒号十六进制表示法）的字符跨度。

返回

IPAddress

转换后的 IP 地址。

例外

FormatException

ipString 不是有效的 IP 地址。