LINQ如何查询匹配给定的字符

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LINQ可用于查询和转换LINQ字符串和字符串集合。它对文本文件中的半结构化数据尤其有用。LINQ 查询可与传统的字符串函数和正则表达式结合使用。例如，可以使用 Split 或 Split 方法来创建字符串数组，然后可以使用LINQ 来查询或修改此数组。可以在 LINQ 查询的where 子句中使用IsMatch 方法。可以使用LINQ 来查询或修改由正则表达式返回的MatchCollection 结果。

LINQ查询匹配给定的字符

using System;  using System.Linq;  using System.Collections.Generic;  using System.Collections;    /// 
  ///Class1 学习linq    /// 
  public class Class1  {   public Class1()   {    //    //TODO: 在此处添加构造函数逻辑    //   }      public string LinqToString()      {            string text = @"Historically, the world of data and the world of objects" +            @" have not been well integrated. Programmers work in C# or Visual Basic" +            @" and also in SQL or XQuery. On the one side are concepts such as classes," +            @" objects, fields, inheritance, and .NET Framework APIs. On the other side" +            @" are tables, columns, rows, nodes, and separate languages for dealing with" +            @" them. Data types often require translation between the two worlds; there are" +            @" different standard functions. Because the object world has no notion of query, a" +            @" query can only be represented as a string without compile-time type checking or" +            @" IntelliSense support in the IDE. Transferring data from SQL tables or XML trees to" +            @" objects in memory is often tedious and error-prone.";           string searchTerm = "data";           //将内容拆分成数组          string[] source = text.Split(new char[] { '.', '?', '!', ' ', ';', ':', ',' }, StringSplitOptions.RemoveEmptyEntries);           //从数组里查询符合条件的数据          var matchQuery = from s in source where s.IndexOf('a')==0 orderby s ascending select s ;                    int wordCount = matchQuery.Count();          string str="";          foreach(string a in matchQuery)              str+=a+",";          //返回查询后的结果          return str+":::"+wordCount;       }        }

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