c# - API线程和静态方法

Question

我有一个 APIController 处理 post 请求，它正在调用静态类中的静态方法，我想返回静态类中静态字典中的下一个值。例如，收到一个请求，我想查找用于该字典的下一个索引，然后在静态属性值中将该索引增加 1。当我一次发送 1 个调用时，效果非常好，但是当 2 个调用同时进入时，它们都会从静态方法中获取保存值。

我想做的是找到一种方法来锁定静态方法，以便它可以一次处理 1 个线程，这样无论有多少个同时调用，静态方法都会同步运行。这基本上是我调用的代码。如果同时调用两次，它们都会返回相同的值，这不是我想要的。

public static class Manager
{
  public static Dictionary<string, bool> ServerList { get; set; }
  public static int NumberOfServers { get; set; }
  public static int NextServerIndex { get; set; }

  public static string GetNextServer()
  {
    int indextocheck = NextServerIndex;
    string servername= null;
    if (indextocheck >= NumberOfServers)
      indextocheck = 0;
    while (timer < maxtime)
    {
      if (ServerList.Values.ElementAt(indextocheck) == false)
      {
        servername = ServerList.Keys.ElementAt(indextocheck);
        ServerList[server] = true;
        NextServerIndex = indextocheck + 1;
        break;
      }
      indextocheck++;
      if (indextocheck == NumberOfServers)
        indextocheck = 0;
    }
    return servername
  }
}

显然我在这里遗漏了一些东西，因为我认为静态方法(在静态类中)将同步运行。我可以做什么来完成我想做的事情？

谢谢!

Answer 1

您可以使用锁

static object SpinLock = new object();

lock(SpinLock)
{
   //Statements
}

就你的情况

hat I am trying to do is find a way to lock the static method so it can process 1 thread at a time so no matter how many simultaneous calls come in the static method runs synchronously. Here is basically the code I am calling. If this gets called twice at the same time they both return the same value, which is not what I want.

public static class Manager
{
  static object SpinLock = new object();
  // Remove the public or protect the get set with a lock
  static Dictionary<string, bool> ServerList { get; set; }
  static int NumberOfServers { get; set; }
  static int NextServerIndex { get; set; }

  public static string GetNextServer()
  {
     lock(SpinLock)
     {

        int indextocheck = NextServerIndex;
        string servername= null;
        if (indextocheck >= NumberOfServers)
          indextocheck = 0;
        while (timer < maxtime)
        {
          if (ServerList.Values.ElementAt(indextocheck) == false)
          {
            servername = ServerList.Keys.ElementAt(indextocheck);
            ServerList[server] = true;
            NextServerIndex = indextocheck + 1;
            break;
          }
          indextocheck++;
          if (indextocheck == NumberOfServers)
              indextocheck = 0;
          }
     }
    return servername;
  }
}