


1. What is .NET Framework? The so-called .NET FrameWork is a platform, and its purpose is for cross-operating system programming. It contains many modules, such as Windows application components, Web development modules, etc. Different operating systems support some of these modules according to their own characteristics. NET framework is a programming platform that runs on a virtual machine. It is based on the Common Language Runtime and supports the development of multiple languages (C#, VB.NET, C++, etc.). Can develop desktop applications (WinForm, WPF, SilverLight, Office), Web applications (Asp.NET, ASP.NET MVC, SilverLight), Windows Service, and mobile embedded development. Currently commonly used versions are: 2.0, 3.0, 3.5, 4.0; 2. Several concepts in .NET (1), CLR concept? Details: CLR is the common language runtime, (Common L
1. C# Basic knowledge arrangement: .NET knowledge
##Introduction: request.getHeader(Referer) is used to obtain the source page address, but sometimes it is empty. The reason is as follows: GetHeader(Referer) requires. The value is only available when using the http protocol, which means that the value can be obtained through the a mark, but the value cannot be obtained by changing the location or a. What request.getHeader(Referer) returns is an Enumeration.
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The char array stores character sequences in C language and is declared as char array_name[size]. The access element is passed through the subscript operator, and the element ends with the null terminator '\0', which represents the end point of the string. The C language provides a variety of string manipulation functions, such as strlen(), strcpy(), strcat() and strcmp().

The usage methods of symbols in C language cover arithmetic, assignment, conditions, logic, bit operators, etc. Arithmetic operators are used for basic mathematical operations, assignment operators are used for assignment and addition, subtraction, multiplication and division assignment, condition operators are used for different operations according to conditions, logical operators are used for logical operations, bit operators are used for bit-level operations, and special constants are used to represent null pointers, end-of-file markers, and non-numeric values.

In C language, special characters are processed through escape sequences, such as: \n represents line breaks. \t means tab character. Use escape sequences or character constants to represent special characters, such as char c = '\n'. Note that the backslash needs to be escaped twice. Different platforms and compilers may have different escape sequences, please consult the documentation.

The difference between multithreading and asynchronous is that multithreading executes multiple threads at the same time, while asynchronously performs operations without blocking the current thread. Multithreading is used for compute-intensive tasks, while asynchronously is used for user interaction. The advantage of multi-threading is to improve computing performance, while the advantage of asynchronous is to not block UI threads. Choosing multithreading or asynchronous depends on the nature of the task: Computation-intensive tasks use multithreading, tasks that interact with external resources and need to keep UI responsiveness use asynchronous.

In C, the char type is used in strings: 1. Store a single character; 2. Use an array to represent a string and end with a null terminator; 3. Operate through a string operation function; 4. Read or output a string from the keyboard.

In C language, char type conversion can be directly converted to another type by: casting: using casting characters. Automatic type conversion: When one type of data can accommodate another type of value, the compiler automatically converts it.

There is no built-in sum function in C language, so it needs to be written by yourself. Sum can be achieved by traversing the array and accumulating elements: Loop version: Sum is calculated using for loop and array length. Pointer version: Use pointers to point to array elements, and efficient summing is achieved through self-increment pointers. Dynamically allocate array version: Dynamically allocate arrays and manage memory yourself, ensuring that allocated memory is freed to prevent memory leaks.

In C language, the main difference between char and wchar_t is character encoding: char uses ASCII or extends ASCII, wchar_t uses Unicode; char takes up 1-2 bytes, wchar_t takes up 2-4 bytes; char is suitable for English text, wchar_t is suitable for multilingual text; char is widely supported, wchar_t depends on whether the compiler and operating system support Unicode; char is limited in character range, wchar_t has a larger character range, and special functions are used for arithmetic operations.


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