How Can I Efficiently Access Specific Lines from a Large Text File with a Defined Structure?

Efficiently process large text files: accurately read specified lines

For large text files, it is crucial to avoid loading the entire file content and read arbitrary lines directly. This article provides an efficient solution for specific file structures.

Assume that the text file has a specific structure: the first 25 lines of header information, followed by an indefinite number of numerical data lines. The solution to extract the header information and numerical data array requires iterating the file line by line:

<code>using (var sr = new StreamReader(fileName))
{
    string[] header = new string[25];
    int lineNum = 0;
    while (lineNum < 25)
    {
        header[lineNum++] = sr.ReadLine();
    }
    // ... (读取数值数据部分的代码) ...
}</code>

This scheme efficiently obtains the required header information and numerical data array by iterating only the necessary lines and avoiding reading the entire file into memory. Additionally, storing these values ​​in an array is optimized for subsequent database storage and manipulation.

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