ToBase64Transform 类

定义

命名空间:

System.Security.Cryptography

程序集:

netstandard.dll, System.Security.Cryptography.dll

Source:

Base64Transforms.cs

将 CryptoStream 转换为 Base 64。

C#

public class ToBase64Transform : IDisposable, System.Security.Cryptography.ICryptoTransform

继承

Object

ToBase64Transform

实现

IDisposable ICryptoTransform

示例

下面的代码示例演示如何使用 类的成员 ToBase64Transform 。

C#

using System;
using System.IO;
using System.Security.Cryptography;

class Members
{
    [STAThread]
    static void Main(string[] args)
    {
        string appPath = (System.IO.Directory.GetCurrentDirectory() + "\\");

        // Insert your file names into this method call.
        EncodeFromFile(appPath + "members.cs", appPath + "members.enc");

        Console.WriteLine("This sample completed successfully; " +
            "press Enter to exit.");
        Console.ReadLine();
    }

    // Read in the specified source file and write out an encoded target file.
    private static void EncodeFromFile(string sourceFile, string targetFile) 
    {
        // Verify members.cs exists at the specified directory.
        if (!File.Exists(sourceFile))
        {
            Console.Write("Unable to locate source file located at ");
            Console.WriteLine(sourceFile + ".");
            Console.Write("Please correct the path and run the ");
            Console.WriteLine("sample again.");
            return;
        }

        // Retrieve the input and output file streams.
        FileStream inputFileStream = 
            new FileStream(sourceFile, FileMode.Open, FileAccess.Read);
        FileStream outputFileStream = 
            new FileStream(targetFile, FileMode.Create, FileAccess.Write);

        // Create a new ToBase64Transform object to convert to base 64.
        ToBase64Transform base64Transform = new ToBase64Transform();

        // Create a new byte array with the size of the output block size.
        byte[] outputBytes = new byte[base64Transform.OutputBlockSize];

        // Retrieve the file contents into a byte array.
        byte[] inputBytes = new byte[inputFileStream.Length];
        inputFileStream.Read(inputBytes, 0, inputBytes.Length);

        // Verify that multiple blocks can not be transformed.
        if (!base64Transform.CanTransformMultipleBlocks)
        {
            // Initializie the offset size.
            int inputOffset = 0;

            // Iterate through inputBytes transforming by blockSize.
            int inputBlockSize = base64Transform.InputBlockSize;

            while(inputBytes.Length - inputOffset > inputBlockSize)
            {
                base64Transform.TransformBlock(
                    inputBytes,
                    inputOffset,
                    inputBytes.Length - inputOffset,
                    outputBytes,
                    0);

                inputOffset += base64Transform.InputBlockSize;
                outputFileStream.Write(
                    outputBytes, 
                    0, 
                    base64Transform.OutputBlockSize);
            }

            // Transform the final block of data.
            outputBytes = base64Transform.TransformFinalBlock(
                inputBytes,
                inputOffset,
                inputBytes.Length - inputOffset);

            outputFileStream.Write(outputBytes, 0, outputBytes.Length);
            Console.WriteLine("Created encoded file at " + targetFile);
        }

        // Determine if the current transform can be reused.
        if (!base64Transform.CanReuseTransform)
        {
            // Free up any used resources.
            base64Transform.Clear();
        }

        // Close file streams.
        inputFileStream.Close();
        outputFileStream.Close();
    }
}
//
// This sample produces the following output:
//
// Created encoded file at C:\ConsoleApplication1\\membersvcs.enc
// This sample completed successfully; press Enter to exit.

注解

Base 64 内容传输编码以不可读的形式表示任意位序列。

构造函数

ToBase64Transform()

初始化 ToBase64Transform 类的新实例。

属性

CanReuseTransform	获取一个值，该值指示是否可重复使用当前转换。
CanTransformMultipleBlocks	获取一个值，该值指示是否可转换多个块。
InputBlockSize	获取输入块大小。
OutputBlockSize	获取输出块大小。

方法

Clear()	释放由 ToBase64Transform 使用的所有资源。
Dispose()	释放 ToBase64Transform 类的当前实例所使用的所有资源。
Dispose(Boolean)	释放由 ToBase64Transform 占用的非托管资源，还可以另外再释放托管资源。
Equals(Object)	确定指定对象是否等于当前对象。 (继承自 Object)
Finalize()	释放 ToBase64Transform 使用的非托管资源。
GetHashCode()	作为默认哈希函数。 (继承自 Object)
GetType()	获取当前实例的 Type。 (继承自 Object)
MemberwiseClone()	创建当前 Object 的浅表副本。 (继承自 Object)
ToString()	返回表示当前对象的字符串。 (继承自 Object)
TransformBlock(Byte[], Int32, Int32, Byte[], Int32)	将输入字节数组的指定区域转换为 Base 64，并将结果复制到输出字节数组的指定区域。
TransformFinalBlock(Byte[], Int32, Int32)	将指定字节数组的指定区域转换为 Base 64。

适用于

另请参阅

• 加密服务