处理system.Format Exception C#

Question

在我的应用程序中,我不明白如何处理system.format异常.见下面的代码

public Harvest_Project(XmlNode node)
    {
        this._node = node;
        this._name = node.SelectSingleNode("name").InnerText;

        this._created_at = storeTime(node.SelectSingleNode("created-at").InnerText);
        this._updated_at = storeTime(node.SelectSingleNode("updated-at").InnerText);
        this._over_budget_notified_at = storeTime(node.SelectSingleNode("over-budget-notified-at").InnerText);
        this._latest_record_at = storeTime(node.SelectSingleNode("hint-latest-record-at").InnerText);
        this._earliest_record_at = storeTime(node.SelectSingleNode("hint-earliest-record-at").InnerText);

        this._billable = bool.Parse(node.SelectSingleNode("billable").InnerText);

        try
        {
                this._id = Convert.ToInt32(node.SelectSingleNode("id").InnerText);
                this._client_id = Convert.ToInt32(node.SelectSingleNode("client-id").InnerText);
                this._budget = float.Parse(node.SelectSingleNode("budget").InnerText);
                this._fees = Convert.ToInt32(getXmlNode("fees", node));

        }
        catch (FormatException e)
        {

           Console.WriteLine();
        }
        catch (OverflowException e)
        {
            Console.WriteLine("The number cannot fit in an Int32.");
        }

        this._code = node.SelectSingleNode("code").InnerText;
        this._notes = node.SelectSingleNode("notes").InnerText;

    }

在这里,尝试并捕获块,所有节点都采用int值,但是,因为_fees取"0"值.它显示了格式异常.我只是希望我的节点不显示空字符串.我想处理这个异常.这意味着,它不应该在"this._fees = Convert.ToInt32(getXmlNode("fees",node))"行中抛出异常;" 因为它返回了我想要的int值.

我怎么能实现这一目标？

Answer 1

通过使用方法,您可以通过try/catch机制避免 控制流 编程 ; 在你的情况下,这样:TryXint.TryParse

int output;
if (int.TryParse(input, out output)) {
  // success
} else {
  // failure
}