将 LINQ 查询与正则表达式合并在一起代码,CSharp代码库,德仔网

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【CSharp】将 LINQ 查询与正则表达式合并在一起

作者:DDT / 发布于2012/10/8/ 563

使用 Regex 类创建正则表达式以便在文本字符串中进行更复杂的匹配。

<div>using System.IO;
using System.Text;
class QueryWithRegEx
{
 public static void Main()
 {
 // Modify this path as necessary so that it accesses your version of Visual Studio.
 string startFolder = @"c:\program files\Microsoft Visual Studio 9.0\";
 // One of the following paths may be more appropriate on your computer.
 //string startFolder = @"c:\program files (x86)\Microsoft Visual Studio 9.0\";
 //string startFolder = @"c:\program files\Microsoft Visual Studio 10.0\";
 //string startFolder = @"c:\program files (x86)\Microsoft Visual Studio 10.0\";</div>
<div> // Take a snapshot of the file system.
 IEnumerable<FileInfo> fileList = GetFiles(startFolder);</div>
<div> // Create the regular expression to find all things "Visual".
 RegularExpressions.Regex searchTerm =
 new RegularExpressions.Regex(@"Visual (Basic|C#|C\+\+|J#|SourceSafe|Studio)");</div>
<div> // Search the contents of each .htm file.
 // Remove the where clause to find even more matchedValues!
 // This query produces a list of files where a match
 // was found, and a list of the matchedValues in that file.
 // Note: Explicit typing of "Match" in select clause.
 // This is required because MatchCollection is not a 
 // generic IEnumerable collection.
 var queryMatchingFiles =
 from file in fileList
 where file.Extension == ".htm"
 let fileText = File.ReadAllText(file.FullName)
 let matches = searchTerm.Matches(fileText)
 where matches.Count > 0
 select new
 {
 name = file.FullName,
 matchedValues = from RegularExpressions.Match match in matches
 select match.Value
 };</div>
<div> // Execute the query.
 Console.WriteLine("The term \"{0}\" was found in:", searchTerm.ToString());</div>
<div> foreach (var v in queryMatchingFiles)
 {
 // Trim the path a bit, then write 
 // the file name in which a match was found.
 string s = v.name.Substring(startFolder.Length - 1);
 Console.WriteLine(s);</div>
<div> // For this file, write out all the matching strings
 foreach (var v2 in v.matchedValues)
 {
 Console.WriteLine(" " + v2);
 }
 }
<div> // Keep the console window open in debug mode
 Console.WriteLine("Press any key to exit");
 Console.ReadKey();
 }
<div> // This method assumes that the application has discovery 
 // permissions for all folders under the specified path.
 static IEnumerable<System.IO.FileInfo> GetFiles(string path)
 {
 if (!System.IO.Directory.Exists(path))
 throw new DirectoryNotFoundException();</div>
<div> string[] fileNames = null;
 List<FileInfo> files = new List<FileInfo>();</div>
<div> fileNames = Directory.GetFiles(path, "*.*", SearchOption.AllDirectories);
 foreach (string name in fileNames)
 {
 files.Add(new FileInfo(name));
 }
 return files;
 }
}

试试其它关键字

　LINQ　　查询与正则表达式　

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