本文实例为大家分享了C#实现Nginx平滑加权轮询算法的具体代码，供大家参考，具体内容如下

代码很简单，算法很经典！ 

1. 定义实体类

public struct ServerConfig
 {
  //初始权重
  public int Weight {get;set;}

  //当前权重
  public int Current {get;set;}

  //服务名称
  public string Name {get;set;}
 }

2. 算法

public static int NextServerIndex(ServerConfig[] serverConfigArray)
 {
  int index = -1;
  int total = 0;
  int size = serverConfigArray.Count();
  for(int i = 0; i< size; i++)
  {
   serverConfigArray[i].Current += serverConfigArray[i].Weight;
   total += serverConfigArray[i].Weight;
   if (index == -1 || serverConfigArray[index].Current < serverConfigArray[i].Current)
   {
    index = i;
   }
  }
  serverConfigArray[index].Current -= total;
  return index;
 }

3.调用

static void Main(string[] args)
  {       
    var sv = new ServerConfig[] {
      new ServerConfig{Name="A", Weight = 4},
      new ServerConfig{Name="B", Weight = 2},
      new ServerConfig{Name="C", Weight = 1}
    };
    int index = 0;
    int sum = sv.Sum(m => m.Weight);
    for(int i=0; i<sum; i++)
    {
      index = NextServerIndex(sv);
      Console.WriteLine("{0}{1}", sv[index].Name, sv[index].Weight);
    }
    Console.Read();
  }

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