从原List中每次随机取一项，添加到新的List中，并在原List中删除。这样重复，直到原List为空为止。

public static List
     
       GetRandomList
      
       (List
       
         inputList){    //Copy to a array    T[] copyArray = new T[inputList.Count];    inputList.CopyTo(copyArray);    //Add range    List
        
          copyList = new List
         
          ();    copyList.AddRange(copyArray);    //Set outputList and random    List
          
            outputList = new List
           
            (); Random rd = new Random(DateTime.Now.Millisecond); while (copyList.Count > 0) { //Select an index and item int rdIndex = rd.Next(0, copyList.Count - 1); T remove = copyList[rdIndex]; //remove it from copyList and add it to output copyList.Remove(remove); outputList.Add(remove); } return outputList;}
           
          
         
        
       
      
     

用linq

List
     
       l = new List
      
       ();l = l.Select(a => new { a, newID = Guid.NewGuid() }).OrderBy(b => b.newID).Select(c=>c.a).ToList();
      
     

 

得到随机数的方法

Random r=new Random();

int n1=r.Next();        //返回非负随机整数

Response.Write(n1+"<br>");

int n2=r.Next(10);   //返回一个小于所指定最大值（10）的非负随机整数

Response.Write(n2+"<br>");

int n3=r.Next()%10;  //返回一人小于所指定最大值（10）的非负随机整数

Response.Write(n3+"<br>");

int n4=r.Next(1,20);  //返回一个指定范围（1-20）内的随机整数

Response.Write(n4+"<br>");

double d5=r.NextDouble();  //得到一个介于0.0-1.0之间的随机整数

Response.Write(d5+"<br>");