1. Base64 encoding rules
The idea of Base64 encoding is to use 64 basic ASCII characters to re-encode the data. It splits the data that needs to be encoded into a byte array. In groups of 3 bytes. Arrange the 24-bit data in order, and then divide the 24-bit data into 4 groups, that is, 6 bits in each group. Then add two 0s before the highest bit of each group to make up one byte. This re-encodes a 3-byte group of data into 4 bytes. When the number of bytes of data to be encoded is not an integral multiple of 3, that is to say, the last group is not enough 3 bytes when grouping. At this time, 1 to 2 0 bytes are filled in the last group. And add 1 to 2 "=" at the end after the final encoding is completed.
Example: BASE64 encoding of ABC:
1. First get the ASCII code value corresponding to ABC. A (65) B (66) C (67);
2. Then take the binary value A (01000001) B (01000010) C (01000011);
3. Then connect the binary codes of these three bytes (010000010100001001000011 );
4. Then divide it into 4 data blocks in units of 6 bits, and fill the highest bit with two 0s to form a 4-byte encoded value, (00010000) (00010100) (00001001) (00000011), The blue part is the real data;
5. Then convert these four bytes of data into decimal numbers to get (16) (20) (9) (3);
6. Finally, the 64 given by BASE64 Basic character table, find the corresponding ASCII code character (Q) (U) (J) (D). The value here is actually the index of the data in the character table.
Note: BASE64 character table: ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/
2. Decoding rules
The decoding process is to restore 4 bytes to 3 bytes and then rearrange the byte array into data according to different data forms.
3. Implementation in C#
byte[] bytes = Encoding.Default.GetBytes("helloworld"); string str = Convert.ToBase64String(bytes); Console.WriteLine(str); Console.ReadLine(); //base 64 decode bytes = Convert.FromBase64String(str); Console.WriteLine(Encoding.Default.GetString(bytes)); Console.ReadLine();
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C#.NET is a powerful development platform that combines the advantages of the C# language and .NET framework. 1) It is widely used in enterprise applications, web development, game development and mobile application development. 2) C# code is compiled into an intermediate language and is executed by the .NET runtime environment, supporting garbage collection, type safety and LINQ queries. 3) Examples of usage include basic console output and advanced LINQ queries. 4) Common errors such as empty references and type conversion errors can be solved through debuggers and logging. 5) Performance optimization suggestions include asynchronous programming and optimization of LINQ queries. 6) Despite the competition, C#.NET maintains its important position through continuous innovation.

The future trends of C#.NET are mainly focused on three aspects: cloud computing, microservices, AI and machine learning integration, and cross-platform development. 1) Cloud computing and microservices: C#.NET optimizes cloud environment performance through the Azure platform and supports the construction of an efficient microservice architecture. 2) Integration of AI and machine learning: With the help of the ML.NET library, C# developers can embed machine learning models in their applications to promote the development of intelligent applications. 3) Cross-platform development: Through .NETCore and .NET5, C# applications can run on Windows, Linux and macOS, expanding the deployment scope.

The latest developments and best practices in C#.NET development include: 1. Asynchronous programming improves application responsiveness, and simplifies non-blocking code using async and await keywords; 2. LINQ provides powerful query functions, efficiently manipulating data through delayed execution and expression trees; 3. Performance optimization suggestions include using asynchronous programming, optimizing LINQ queries, rationally managing memory, improving code readability and maintenance, and writing unit tests.

How to build applications using .NET? Building applications using .NET can be achieved through the following steps: 1) Understand the basics of .NET, including C# language and cross-platform development support; 2) Learn core concepts such as components and working principles of the .NET ecosystem; 3) Master basic and advanced usage, from simple console applications to complex WebAPIs and database operations; 4) Be familiar with common errors and debugging techniques, such as configuration and database connection issues; 5) Application performance optimization and best practices, such as asynchronous programming and caching.

C# is widely used in enterprise-level applications, game development, mobile applications and web development. 1) In enterprise-level applications, C# is often used for ASP.NETCore to develop WebAPI. 2) In game development, C# is combined with the Unity engine to realize role control and other functions. 3) C# supports polymorphism and asynchronous programming to improve code flexibility and application performance.

C# and .NET are suitable for web, desktop and mobile development. 1) In web development, ASP.NETCore supports cross-platform development. 2) Desktop development uses WPF and WinForms, which are suitable for different needs. 3) Mobile development realizes cross-platform applications through Xamarin.

The C#.NET ecosystem provides rich frameworks and libraries to help developers build applications efficiently. 1.ASP.NETCore is used to build high-performance web applications, 2.EntityFrameworkCore is used for database operations. By understanding the use and best practices of these tools, developers can improve the quality and performance of their applications.

How to deploy a C# .NET app to Azure or AWS? The answer is to use AzureAppService and AWSElasticBeanstalk. 1. On Azure, automate deployment using AzureAppService and AzurePipelines. 2. On AWS, use Amazon ElasticBeanstalk and AWSLambda to implement deployment and serverless compute.


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