接口并发控制，限制重要接口的并发请求

[HttpPost]
[RequestLimit(EnumLimitType.BusinessCode, "同步任务正在执行中....")]
public async Task<bool> SyncSAPDataAsync(SyncSAPDataReq input)
{
    return await _business.SyncSAPDataAsync(input, HttpContext.RequestAborted);
}

/// <summary>
/// 同步采购单到SAP
/// </summary>
/// <param name="id"></param>
/// <param name="cancellationToken"></param>
/// <returns>-1失败 1 成功 2跳过</returns>
/// <exception cref="RequestErrorException"></exception>
[ProcessWithLockAttribute<ProcessWithLockKeySyncSap>("sapsync:purchaseorder", "前一次同步还未完成")]
public async Task<res_params_syncSAP> SyncToSAP(req_params_syncSAP input, CancellationToken cancellationToken)
{
  ...
}

public class ProcessWithLockKeySyncSap : IProcessWithLockKey
{
    public string GetLockDataKey(object[] arguments)
    {
        var input = arguments[0] as req_params_syncSAP;
        if (input == null)
            throw new RequestErrorException("无法解析参数：req_params_syncSAP");
        return input.RowId;
    }
}