如何在c#.net中查找文本文件包含特定段落 [英] How to find that a text file contains a specific paragraph in c#.net

问题描述

假设有一个包含文本的文本文件(示例:-任何网站的内容). 现在，如果我想从文本文件中匹配作为段落的字符串 strA ，即文本文件中的文本说a.txt是否包含字符串 strA ?

Suppose there is one text file which contains a text(Example :-content of any website). Now if I want to match a string strA, which is as paragraph, from the text file i.e the text in a text file say a.txt contains the string strA or not?

如何比较?

推荐答案

这是您要查找的内容的非常基本的实现.有很多需要改进的地方.

Here is a very basic implementation of what you're looking for. There are vast improvements to be made.

    /// <summary>
    /// Finds the text files that contain paragraph.
    /// </summary>
    /// <param name="paragraph">The paragraph to check for.</param>
    /// <param name="textFilePaths">A list of paths to text files to check.</param>
    /// <returns></returns>
    List<string> FindFilesWithParagraph(string paragraph, List<string> textFilePaths)
    {
        List<string> foundPaths = new List<string>(); // list of paths to text files w/ paragraph

        foreach (string path in textFilePaths) // iterate through each file
        {
            if (!File.Exists(path)) // check files actually exist
                throw new ArgumentException();

            using (var sr = new System.IO.StreamReader(path))
            {
                if (sr.ReadToEnd().Contains(paragraph)) // read contents of file
                    foundPaths.Add(path); // and add it to list if it contains the paragraph
            }
        }

        return foundPaths;
    }

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