UTF7Encoding 构造函数

Source:

UTF7Encoding.cs

Source:

UTF7Encoding.cs

Source:

UTF7Encoding.cs

Source:

UTF7Encoding.cs

Source:

UTF7Encoding.cs

public:
 UTF7Encoding();

public UTF7Encoding();

[System.Obsolete("The UTF-7 encoding is insecure and should not be used. Consider using UTF-8 instead.", DiagnosticId="SYSLIB0001", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
public UTF7Encoding();

Public Sub New ()

属性

ObsoleteAttribute

示例

下面的代码示例演示如何创建新 UTF7Encoding 实例并显示编码的名称。

using System;
using System.Text;

class UTF7EncodingExample {
    public static void Main() {
        UTF7Encoding utf7 = new UTF7Encoding();
        String encodingName = utf7.EncodingName;
        Console.WriteLine("Encoding name: " + encodingName);
    }
}

Imports System.Text

Class UTF7EncodingExample
    
    Public Shared Sub Main()
        Dim utf7 As New UTF7Encoding()
        Dim encodingName As String = utf7.EncodingName
        Console.WriteLine("Encoding name: " & encodingName)
    End Sub
End Class

注解

此构造函数创建不允许可选字符的实例。 UTF7Encoding调用构造函数等效于调用UTF7Encoding.UTF7Encoding(Boolean)采用参数allowOptionals并指定false该参数的构造函数。

如果实例允许可选字符，则 Unicode 码位使用相应的可选字符进行编码，而不是修改后的 base 64 字符。 可选字符是感叹号（“！”）、向后斜杠（“\”），竖线（“|”），双引号（“”“），数字符号（”#“），美元符号（”$“），百分比符号（”%“），和号（”&“），星号（”*“），分号（”;“），左 尖括号（”“），右尖括号（”“），<>左大括号（”{“），右大括号（”}“），左方括号（”[“），右方括号（”]“），等号（”=“），符号（”@“），扬反射口音（”^“），下划线（”_“），和严重口音（”'“）。

Source:

UTF7Encoding.cs

Source:

UTF7Encoding.cs

Source:

UTF7Encoding.cs

Source:

UTF7Encoding.cs

Source:

UTF7Encoding.cs

public:
 UTF7Encoding(bool allowOptionals);

public UTF7Encoding(bool allowOptionals);

[System.Obsolete("The UTF-7 encoding is insecure and should not be used. Consider using UTF-8 instead.", DiagnosticId="SYSLIB0001", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
public UTF7Encoding(bool allowOptionals);

new System.Text.UTF7Encoding : bool -> System.Text.UTF7Encoding

[<System.Obsolete("The UTF-7 encoding is insecure and should not be used. Consider using UTF-8 instead.", DiagnosticId="SYSLIB0001", UrlFormat="https://aka.ms/dotnet-warnings/{0}")>]
new System.Text.UTF7Encoding : bool -> System.Text.UTF7Encoding

Public Sub New (allowOptionals As Boolean)

参数

属性

ObsoleteAttribute

示例

下面的代码示例演示如何创建允许可选字符的新 UTF7Encoding 实例。

using System;
using System.Text;

class UTF7EncodingExample {
    public static void Main() {

        // A few optional characters.
        string chars = "!@#$";

        // The default Encoding does not allow optional characters.
        // Alternate byte values are used.
        UTF7Encoding utf7 = new UTF7Encoding();
        Byte[] bytes1 = utf7.GetBytes(chars);
        
        Console.WriteLine("Default UTF7 Encoding:");
        ShowArray(bytes1);

        // Convert back to characters.
        Console.WriteLine("Characters:");
        ShowArray(utf7.GetChars(bytes1));

        // Now, allow optional characters.
        // Optional characters are encoded with their normal code points.
        UTF7Encoding utf7AllowOptionals = new UTF7Encoding(true);
        Byte[] bytes2 = utf7AllowOptionals.GetBytes(chars);
        
        Console.WriteLine("UTF7 Encoding with optional characters allowed:");
        ShowArray(bytes2);

        // Convert back to characters.
        Console.WriteLine("Characters:");
        ShowArray(utf7AllowOptionals.GetChars(bytes2));
    }

    public static void ShowArray(Array theArray) {
        foreach (Object o in theArray) {
            Console.Write("[{0}]", o);
        }
        Console.WriteLine();
    }
}

Imports System.Text

Class UTF7EncodingExample
    
    Public Shared Sub Main()
        
        ' A few optional characters.
        Dim chars As String = "!@#$"
        
        ' The default Encoding does not allow optional characters.
        ' Alternate byte values are used.
        Dim utf7 As New UTF7Encoding()
        Dim bytes1 As Byte() = utf7.GetBytes(chars)
        
        Console.WriteLine("Default UTF7 Encoding:")
        ShowArray(bytes1)
        
        ' Convert back to characters.
        Console.WriteLine("Characters:")
        ShowArray(utf7.GetChars(bytes1))
        
        ' Now, allow optional characters.
        ' Optional characters are encoded with their normal code points.
        Dim utf7AllowOptionals As New UTF7Encoding(True)
        Dim bytes2 As Byte() = utf7AllowOptionals.GetBytes(chars)
        
        Console.WriteLine("UTF7 Encoding with optional characters allowed:")
        ShowArray(bytes2)
        
        ' Convert back to characters.
        Console.WriteLine("Characters:")
        ShowArray(utf7AllowOptionals.GetChars(bytes2))
    End Sub
    
    
    Public Shared Sub ShowArray(theArray As Array)
        Dim o As Object
        For Each o In  theArray
            Console.Write("[{0}]", o)
        Next o
        Console.WriteLine()
    End Sub
End Class

注解

如果实例允许可选字符，则 Unicode 码位使用相应的可选字符进行编码，而不是修改后的 base 64 字符。 可选字符是感叹号（“！”）、向后斜杠（“\”），竖线（“|”），双引号（“”“），数字符号（”#“），美元符号（”$“），百分比符号（”%“），和号（”&“），星号（”*“），分号（”;“），左 尖括号（”“），右尖括号（”“），<>左大括号（”{“），右大括号（”}“），左方括号（”[“），右方括号（”]“），等号（”=“），符号（”@“），扬反射口音（”^“），下划线（”_“），和严重口音（”'“）。