如何在LINQ查询中使用随机函数? [英] How to use random function in LINQ Query?

问题描述

尊敬的先生，


如何在LINQ中使用随机函数?

我有50条记录，现在将其自动更改为随机顺序....


如何解决此问题回复我.....

Dear sir,


How to use Random function in LINQ?

I have 50 records, now change this automatically into random order....


How to solve this Reply me.....

推荐答案

一种选择是使用从IComparer<T>类继承的Comparer 类，如下所示:

One option is to use a Comparer class inherited from IComparer<T> class as shown below:

void Main()
{
    List<person> persons = new List<person>(){
    	new Person("A","M"),
    	new Person("B","N"),
    	new Person("C","O"),
    	new Person("D","P"),
    	new Person("E","Q"),
    	new Person("F","R"),
    	new Person("G","S"),
    	new Person("H","T")	
    };
    var query = persons.OrderBy(p => p,new RandomComparer());
}
//query output
//Name Address 
//A M 
//C O 
//D P 
//F R 
//E Q 
//B N 
//H T 
//G S 

public class Person {
    public string Name {get; set;}
    public string Address {get; set;}
    
    public Person(string name, string address){
    	Name = name;
    	Address = address;
    }
}
public class RandomComparer : IComparer<person> {
    Random random = new Random();
    public int Compare(Person first, Person second){
    	return random.Next(-1,2);	
    }
}

请参阅此链接..

http://stackoverflow.com/questions/648196/random-row-from-linq- to-sql [^ ]

http://netpl.blogspot.com/2008/07/generating-random- sequence-with-linq.html [ ^ ]

http://blog.wujitouch.com/post/LINQ-Select- a-random-object-or-entity.aspx [ ^ ]

Please refer this link..

http://stackoverflow.com/questions/648196/random-row-from-linq-to-sql[^]

http://netpl.blogspot.com/2008/07/generating-random-sequences-with-linq.html[^]

http://blog.wujitouch.com/post/LINQ-Select-a-random-object-or-entity.aspx[^]

我刚刚发布了一些代码，其中包括用于向LINQ添加随机功能的几种扩展方法，包括random选择和改组.

使用随机操作扩展LINQ [

I''ve just posted some code that includes several extension methods for adding random functionality to LINQ, include random selection and shuffling.

Extending LINQ with Random Operations[^]

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