处理system.Format Exception C#

时间:2013-08-23 13:56:42

标签: c# wpf exception-handling formatexception

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。

我怎么能实现这个目标?

2 个答案:

答案 0 :(得分:5)

您通常可以使用TryX方法avoid control-flow programming try/catch机制;在您的情况下,int.TryParse,以便:

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

答案 1 :(得分:0)

你还没有发布xml,我找不到getXmlNode函数
但我相信它返回的XmlNode只有int的内容(否则,你会使用InnerText属性。

试试这个:

XmlNode fees = getXmlNode(...)
var curr = fees.FirstChild;
int _fees = 0;
while (curr != null) {
    _fees += (Convert.ToInt32(curr.InnerText);
    curr = curr.NextSibling();
}