Google Ads API更新CampaignBudget的AmountMicros无报错但未生效问题

操作类型配置错误，你使用了创建预算的操作来执行更新逻辑：

• CampaignBudgetOperation下的Create字段专门用于新建预算，哪怕你传入了已有预算的ResourceName和Id，API也会忽略这些标识生成全新的预算实例，不会修改原有预算，因此你原来Campaign绑定的预算不会有任何变化，自然在后台看不到更新效果。

1. 替换操作类型：将CampaignBudgetOperation的Create属性改为Update即可，修改后代码如下：

CampaignBudget budget = new CampaignBudget()
{
    ResourceName = ResourceNames.CampaignBudget(customerId, budgetId),
    AmountMicros = (price + amount) * 100000,
    Id = budgetId
};

CampaignBudgetOperation budgetOperation = new CampaignBudgetOperation()
{
    // 把原来的Create = budget改为Update = budget
    Update = budget,
    UpdateMask = FieldMasks.AllSetFieldsOf(budget),
};

try
{
    MutateCampaignBudgetsResponse responseBudget = 
    budgetService.MutateCampaignBudgets(
    customerId.ToString(), new CampaignBudgetOperation[] { budgetOperation 
  });

    foreach(MutateCampaignBudgetResult result in responseBudget.Results)
    {
        updateResponse.CampignId = campaignId;
        updateResponse.Updated = true;
        // 调试时可以打印资源名确认修改的是目标预算
        Console.WriteLine($"更新成功，预算资源名：{result.ResourceName}");
    }

    return updateResponse;
}
catch (GoogleAdsException e)
{
    Console.WriteLine("Failure:");
    Console.WriteLine($"Message: {e.Message}");
    Console.WriteLine($"Failure: {e.Failure}");
    Console.WriteLine($"Request ID: {e.RequestId}");
    updateResponse.Updated = false;
    return updateResponse;
}

2. 可选优化项：

• 手动指定UpdateMask只更新amount_micros字段，避免误修改其他未明确要调整的属性，写法如下：
  UpdateMask = new FieldMask { Paths = { "amount_micros" } }
• 原代码catch块中return updateResponse后的throw语句永远不会执行，可以直接删除。
• 确认你传入的budgetId是对应Campaign实际绑定的预算ID，避免操作错预算对象。

内容的提问来源于stack exchange，提问作者willsgobi