users.xml 存放路径: 当前C#工程目录下的debug文件夹中
<?xml version="1.0" encoding="gb2312"?>
<root>
<user>
<username>meteorWJ</username>
<password>123</password>
</user>
<user>
<username>eleven</username>
<password>111</password>
</user>
</root>Windows 窗体程序
public partial class Form1 : Form
{
private DataSet ds = new DataSet();
public Form1()
{
InitializeComponent();
} private void button1_Click(object sender, EventArgs e)
{
ds.ReadXml("users.xml");
bool flag = false;
foreach (DataTable dt in ds.Tables)
{
if (dt.TableName == "user")
{
foreach (DataRow dr in dt.Rows)
{
if (dr["username"].ToString() == username.Text)
{
if (dr["password"].ToString() == password.Text)
{
flag = true;
}
} }
}
} if (flag == true)
{
dataGrid.DataSource = ds.Tables[0];
}
else
{
MessageBox.Show("登录信息不正确！");
}
} private void button3_Click(object sender, EventArgs e)
{
try
{
XmlDocument doc = new XmlDocument();
doc.Load("users.xml");
XmlElement newUser = doc.CreateElement("user"); XmlElement newUsername = doc.CreateElement("username");
newUsername.InnerText = username.Text;
newUser.AppendChild(newUsername);
XmlElement newUserpass = doc.CreateElement("password");
newUserpass.InnerText = password.Text;
newUser.AppendChild(newUserpass);
doc.DocumentElement.AppendChild(newUser);
doc.Save("user.xml");
MessageBox.Show("用户"+username.Text+"添加成功！");
}
catch (Exception ex)
{
MessageBox.Show(ex.Message); }
}
}运行效果：
users.xml
<?xml versinotallow="1.0" encoding="gb2312"?>
<root>
<user>
<username>meteorWJ</username>
<password>123</password>
</user>
<user>
<username>eleven</username>
<password>111</password>
</user>
<user>
<username>crystal</username>
<password>123</password>
</user>
</root>
