LINQ字符串的查询方式有很多,在这里介绍一种最常规的方法。如果大家有更多更好的方法,欢迎提出来一起讨论。
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;
- }
- }
当前标题:查询LINQ字符串方法浅析
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