<%@ Page Language="C#" ContentType="text/html"%> <%@ Import Namespace="System"%> <script language="C#" runat="server"> void Page_Load(Object sender,EventArgs e){ //获取要加密的字段,并转化为Byte[]数组 byte[] data=System.Text.Encoding.Unicode.GetBytes(source.Text.ToCharArray()); //建立加密服务 System.Security.Cryptography.MD5 md5 = new System.Security.Cryptography.MD5CryptoServiceProvider(); //加密Byte[]数组 byte[] result= md5.ComputeHash(data); //将加密后的数组转化为字段 string sResult=System.Text.Encoding.Unicode.GetString(result); //显示出来 sha1_1.Text="MD5普通加密:"+sResult.ToString()+"<br/>"; //作为密码方式加密 string EnPswdStr=System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(source.Text.ToString(),"MD5"); //显示出来 sha1_2.Text="MD5密码加密:"+EnPswdStr+"<br/>"; } </script> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>测试</title> </head> <body> <h3 id="SHA-加密">SHA1加密</h3> <form runat="server"> <asp:label id="sha1_1" runat="server"></asp:label> <asp:label id="sha1_2" runat="server"></asp:label> <asp:textbox ID="source" runat="server" TextMode="SingleLine" Text="test" AutoPostBack="true" /> (回车) </form> </body> </html>
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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().

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.

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.

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, 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.

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.

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.

A strategy to avoid errors caused by default in C switch statements: use enums instead of constants, limiting the value of the case statement to a valid member of the enum. Use fallthrough in the last case statement to let the program continue to execute the following code. For switch statements without fallthrough, always add a default statement for error handling or provide default behavior.


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