编写的XML文件而不覆盖previous数据 [英] Writing XML to a file without overwriting previous data
本文介绍了编写的XML文件而不覆盖previous数据的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我现在有一个C#程序将数据写入到一个XML文件中使用.NET Framework。
I currently have a C# program that writes data to an XML file in using the .NET Framework.
if (textBox1.Text!="" && textBox2.Text != "")
{
XmlTextWriter Writer = new XmlTextWriter(textXMLFile.Text, null);
Writer.WriteStartDocument();
Writer.WriteStartElement("contact");
Writer.WriteStartElement("firstName");
Writer.WriteString(textBox1.Text);
Writer.WriteEndElement();
Writer.WriteEndElement();
Writer.WriteEndDocument();
Writer.Close();
}
else
{
MessageBox.Show("Nope, fill that textfield!");
}
现在的问题是,我的XML文件被覆盖每次我试图挽救一些新的东西。
The problem is that my XML file gets overwritten every time I try to save something new.
我有两个空
和 Encoding.UTF8
在的XmlTextWriter
,但它似乎并没有成为什么样的变化,非重写/覆盖功能。
I've had both null
and Encoding.UTF8
for the second parameter in the XmlTextWriter
but it doesn't seem to be what changes the non-overwrite/overwrite function.
推荐答案
您可以使用的的XDocument :
public static void Append(string filename, string firstName)
{
var contact = new XElement("contact", new XElement("firstName", firstName));
var doc = new XDocument();
if (File.Exists(filename))
{
doc = XDocument.Load(filename);
doc.Element("contacts").Add(contact);
}
else
{
doc = new XDocument(new XElement("contacts", contact));
}
doc.Save(filename);
}
,然后用这样的:
and then use like this:
if (textBox1.Text != "" && textBox2.Text != "")
{
Append(textXMLFile.Text, textBox1.Text);
}
else
{
MessageBox.Show("Nope, fill that textfield!");
}
这将创建/添加联系人到以下XML结构:
This will create/append the contact to the following XML structure:
<?xml version="1.0" encoding="utf-8"?>
<contacts>
<contact>
<firstName>Foo</firstName>
</contact>
<contact>
<firstName>Bar</firstName>
</contact>
</contacts>
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