Summary of usage of EXCEL examples
This article mainly introduces the C# example code for operating Excel through oledb. The editor thinks it is quite good. Now I will share it with you and give it as a reference. Let's follow the editor to take a look and sort out the documents. I searched out a C# example code for operating Excel through oledb. I sorted it out and streamlined it a little for sharing. public string GetConnectionString() { Dictionary & lt; string, string & gt; props = new dictionary & lt; string, string & gt; (); // xlsx & nbsp
# 1. C#Operation Excel instance code through OLEDB
Introduction: This article mainly introduces the C# example code for operating Excel through oledb. The editor thinks it is quite good. Now I will share it with you and give it as a reference. Let’s follow the editor to take a look
2. Introduction to using Python to operate Excel xlsx files
Introduction: When doing a project some time ago, I had to use Python to directly generate Excel files. Later, as the needs changed, I had to read the existing Excel files. So I wanted to record it. This article mainly introduces you to the relevant information on Python's operation of Excel's xlsx file. Friends in need can refer to it.
3. Java uses POI to operate excel files sample code sharing (picture and text)
Introduction: This article mainly introduces the method of using java to operate excel files and realize batch export and import using POI. Has very good reference value. Let’s take a look with the editor below
4. How to use Android to operate Excel files
Introduction: When operating Excel files to export reports in Android, the open source library jxl is mainly used. It was first used in java, but it can also be used in Android. Similar POI can only be used for Java, not Android, because it relies on many libraries.
5. C# Example of operating EXCEL style--generating EXCEL audit table
Introduction: #region Generate audit table public static void GenerateAccountGrid(string fileName, string tableName, string companyName, string owner, DateTime endline, string copyMan, AnalysisEnt ent) {
6. C# Detailed code introduction for operating EXCEL
7.
C# Example of adding, deleting, modifying and querying Excel data
##Introduction: C# operating Excel Data addition, deletion, modification and query. First create the ExcelDB.xlsx file and add two worksheets.
8.
C#Example code for operating EXCEL DataTable conversionIntroduction: C# example code for operating EXCEL DataTable conversion, friends in need can refer to it 9. C# How to simply export Excel using winform ##Introduction: This article mainly introduces Learn how to simply export Excel using C# using winform, and analyze WinForm operations such as writing and exporting Excel files in the form of examples. Friends in need can refer to the following C# Method to update and add data to Excel table using Ado.Net [Related Q&A recommendations]: Can python operate with excel open? Python operates excel, Add color to cells As shown in the figure, Java uses poi to operate excel. When the cell is null, how to make it an empty string? python - xlwt operates excel, how to modify the cell color by directly specifying the rgb value? python - calling win32com to operate excel drawing and reporting an error##Introduction: This article mainly This article introduces the C# method of using Ado.Net to update and add data to Excel tables, and analyzes the principles and usage skills of OLEDB in more detail, which can achieve more convenient operation of Excel data. Friends in need can refer to the following
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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, 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.

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 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 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().

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.
