我想从凭证 xml 文件中读取用户名和密码。对于成功登录,它应该转到目标页面,或者对于无效登录,它应该显示无效的用户名或密码。假设我在 credential.xml 文件中没有很多用户名和密码,用户可以动态输入任何用户名和密码的组合。请有人帮助我如何做到这一点......我已经编写了代码但抛出错误“对象引用未设置为对象的实例。” 这是我的 Credentials.xml
<logininfo>
<crendential>
<username>Rahul1</username>
<password>124356</password>
</crendential>
<crendential>
<username>Rahul2</username>
<password>654321</password>
</crendential>
<crendential>
<username>Rahul3</username>
<password>852741</password>
</crendential>
</logininfo>
aspx.cs 页面后面的代码:
protected void BtnLogin_Click(object sender, EventArgs e)
{
XmlDocument doc = new XmlDocument();
doc.Load(Server.MapPath("Credentials.xml"));
XmlNode root=doc.DocumentElement;
string username = root.SelectSingleNode("username").ChildNodes[0].Value;
string password = root.SelectSingleNode("password").ChildNodes[0].Value;
string user = TxtUserName.Text.Trim();
string pass = TxtPassword.Text.Trim();
if ((user == username) && (pass == password))
{
Session["User"] = username;
Response.Redirect("destinationpage.aspx");
}
else
{
lblError.Text="Invalid userid or password";
}
}