用于函数重试的 C# Polly WaitAndRetry 策略

Question

我是 C# 编码的新手，我只想知道如何在函数失败时为我的函数设置 polly WaitAndRetry。以下是我的步骤

我使用 NuGet 包安装了包 Install-Package Polly
在我的代码中添加了using polly。
下面是我的代码

public async Task<string> ConfigInsert(config model)
{
    try
    {
        SendToDatabase(model);

        await Policy.Handle<Exception>()
            .RetryAsync(NUMBER_OF_RETRIES)
            .ExecuteAsync(async () =>
                await SendToDatabase(model))
            .ConfigureAwait(false);
    } 
    Catch(Exception e)
    {
        _log.write("error occurred");
    }
        
    public async Task<string> SendToDataBase(config model)
    {
        var ss = DataBase.PostCallAsync(model)
            .GetAwaiter()
            .GetResult();
        return ss;
    }
}

但是这个电话一直在打，没有任何延迟。我尝试在 catch 调用中使用 WaitAndRetryAsync，但它不起作用。 WaitAndRetryAsync 仅接受 HTTP repose 消息。我想在 try-catch

中实现 ait 和 retry 选项

Answer 1

您说您想要 WaitAndRetry 但您没有使用该功能...而且它不仅适用于 HttpResponse。请阅读 documentation.

下面的代码应该可以让您先行一步：

class Program
{
    static async Task Main(string[] args)
    {
        // define the policy using WaitAndRetry (try 3 times, waiting an increasing numer of seconds if exception is thrown)
        var policy = Policy
          .Handle<Exception>()
          .WaitAndRetryAsync(new[]
          {
            TimeSpan.FromSeconds(1),
            TimeSpan.FromSeconds(2),
            TimeSpan.FromSeconds(3)
          });

        // execute the policy
        await policy.ExecuteAsync(async () => await SendToDatabase());

    }

    static async Task SendToDatabase()
    {
        Console.WriteLine("trying to send to database");
        await Task.Delay(100);
        throw new Exception("it failed!");
    }
}

Answer 2

class Program
{
    static Main(string[] args)
    {
        // define the policy using WaitAndRetry (try 3 times, waiting an increasing numer of seconds if exception is thrown)
        var policy = Policy
          .Handle<Exception>()
          .WaitAndRetry(new[]
          {
            TimeSpan.FromSeconds(1),
            TimeSpan.FromSeconds(2),
            TimeSpan.FromSeconds(3)
          });

        // execute the policy
         policy.Execute(() =>  SendToDatabase());

    }
}

用于函数重试的 C# Polly WaitAndRetry 策略

C# Polly WaitAndRetry policy for function retry

c#

polly