下面是现有的代码。我正在尝试重构这段代码。
用C#实现这一点的最佳方法是什么
第一次，我要等200秒，第二次要等400秒，第三次要等600秒
await Task.Delay(200);
var category = this.categoryRepository.Categories.SingleOrDefault(x => x.CategoryId == categoryId);
if (category == null)
{
await Task.Delay(400);
category = this.categoryRepository.Categories.SingleOrDefault(x => x.CategoryId == categoryId);
if (category == null)
{
await Task.Delay(600);
category = this.categoryRepository.Categories.SingleOrDefault(x => x.CategoryId == categoryId);
if (category == null)
{
throw NullReferenceException;
}
}
}
添加计数器并使用循环:
int numTries = 0;
Category category = null;
do
{
numTries++;
await Task.Delay(200 * numTries);
category = this.categoryRepository.Categories.SingleOrDefault(x => x.CategoryId == categoryId);
} while (category == null && numTries < 3);
if (category == null)
{
throw NullReferenceException;
}
