从后面的ASP.NET代码写入/覆盖特定的XML文件

Question

for(int i=0; i<list.count;i++)
{
    list[i].CounryName = //write it into the XML file;
    list[i].CountryUserAddress = //Write it into the XML file;
}

附言。我忘了提到我实际上应该覆盖已经存在的XML文件，而不是创建一个新的文件。

Answer 1

下面是一个如何使用所提供的数据进行此操作的示例：

    public string EditDoc()
    {
        string filename = "Path/MyFileName.xml";
        List<string> list = new List<string>();

        if (File.Exists(filename)) //we have the file, so update it
        {
            XmlDocument myDoc = new XmlDocument(); //create a document object
            myDoc.Load(filename); //load existing info
            XmlNode root = myDoc.DocumentElement; //the root node ("Country")
            XmlNode nodeToUpdate = root.SelectSingleNode("CountryName"); //select the node to update

            nodeToUpdate.Value = "new info"; //give it a new value

            myDoc.Save(filename); //save the document
        } 
        else //didn't find the file
        {
            XmlDocument myDoc = new XmlDocument(); //create a new document

            XmlNode countryList = myDoc.CreateElement("CountryList");
            myDoc.AppendChild(countryList);

            for (int i = 0; i < list.Count; i++)
            {
                XmlNode country = myDoc.CreateElement("Country"); //create the parent "Country" element
                myDoc.AppendChild(countryList); //append to the list

                XmlNode countryName = myDoc.CreateElement("CountryName"); //create element for "CountryName"
                countryName.AppendChild(myDoc.CreateTextNode(list[i].CountryName)); //add data from list index
                country.AppendChild(countryName); //append this as a child to "Country"

                XmlNode countryUserAddress = myDoc.CreateElement("CountryUserAddress"); //create element for "CountryUserAddress"
                countryUserAddress.AppendChild(myDoc.CreateTextNode(list[i].CountryUserAddress)); //add data from list index
                country.AppendChild(countryUserAddress); //append as a child to "Country"
            }

            myDoc.Save(filename); //save the document
        }
    }

一般的想法是遍历文档树并选择要更新的值。也许有更好的方法来做到这一点，但这是我熟悉的方法。类似地，您也可以用同样的方式创建xml文档。

主题是不同的，但这极大地帮助我理解了读/写XML数据：这个链接

<CountryList>
    <Country>
        <CountryName>Blah</CountryName>
        <CountryUserAddress>Blah</CountryUserAddress>
    </Country>
    <Country>
        <CountryName>Blah</CountryName>
        <CountryUserAddress>Blah</CountryUserAddress>
    </Country>
</CountryList>