Question

所以我有一个提示，要求用户输入文件的位置。如果文件不存在，我该怎么做才能让用户重新获取文件位置？这是我目前的代码。我有它的原始形式，因为我正在搞乱它。我接近了，但没有雪茄。提前谢谢！

编辑：因此，如果用户键入c：/file.xml并且它应该是c：/file32.xml，它将崩溃。如何让它让用户再试一次？

static void Main(string[] args)
    {
        //asks user for location of the XML file
        Console.WriteLine("Enter location of XML file and XML file name please. Example - c:/xmlfile.xml");
        //XML files becomes "xmlfile"
        string xmlfile = Console.ReadLine();


        //takes xmlfile and runs it through XPATH
        string fileName = xmlfile;
        XPathDocument doc = new XPathDocument(fileName);
        XPathNavigator nav = doc.CreateNavigator();

        //Compile a standard XPath expression
        //Selects all of the names
        XPathExpression expr;
        expr = nav.Compile("/zabbix_export/templates/template/items/item/name | /zabbix_export/templates/template/items/item/description");
        XPathNodeIterator iterator = nav.Select(expr);

Answer 1

while (!File.Exists(xmlFile))
{
       Console.WriteLine("Please reenter a valid file name:");
        xmlfile = Console.ReadLine();
}

Answer 2

继续检查文件是否存在，直到用户最终将正确的路径放入:)

string xmlFile;
do
{
    Console.WriteLine("Enter location of XML file and XML file name please. Example - c:/xmlfile.xml");
    xmlFile = Console.ReadLine();
} while (!File.Exists(xmlFile));

Answer 3

XPathDocument doc = new XPathDocument(fileName);

while (doc == null)
{
    // display prompt
    // try to retrieve new value for doc
}

    XPathNavigator nav = doc.CreateNavigator();
    //Compile a standard XPath expression
    //Selects all of the names
    XPathExpression expr;
    expr = nav.Compile("/zabbix_export/templates/template/items/item/name | /zabbix_export/templates/template/items/item/description");
    XPathNodeIterator iterator = nav.Select(expr);

如果用户在文件中键入不存在，请通知并要求重新键入文件名

3 个答案: