Develop Reference

C# Pulling RSS LastBuildDate

all.
I am interested in pulling the Last Build Date information from an RSS feed. I will use the information to let the user know when there is a new feed out.
Here is the RSS feed...
<?xml version="1.0" encoding="utf-8" ?>
<rss version="2.0" xmlns:media="http://search.yahoo.com/mrss/"
xmlns:dc="http://purl.org/dc/elements/1.1/">
<channel>
<title>User's Facebook Notifications</title>
<link>https://www.facebook.com/notifications?id=USERIDHERE</link>
<description>User's Facebook Notifications</description>
<language>en-us</language>
<category domain="Facebook">NotificationSyndicationFeed</category>
<generator>Facebook Syndication</generator>
<docs>http://www.rssboard.org/rss-specification</docs>
<lastBuildDate>Thu, 13 Feb 2014 21:19:52 -0500</lastBuildDate>
<webMaster>webmaster#facebook.com</webMaster>
</channel>
<access:restriction relationship="deny" xmlns:access="http://www.bloglines.com/about/specs/fac-1.0" />
</rss>
On load, the application will pull the initial lastBuildDate and store it in a label then use a timer to compare the label to a newly pulled value every few minutes. For example:
private void frmFacebookRSS(object sender, EventArgs e)
{
getLastBuild();
DateTime now = DateTime.Now;
lblLastBuild.Text = LastBuild;
}
private void tmrUpdate_Tick(object sender, EventArgs e)
{
getLastBuild();
DateTime now = DateTime.Now;
if (lblLastBuild.text != LastBuild)
{
System.Beep // Or whatever desired output
lblLastBuild.Text = LastBuild;
}
I'm just not certain on how to pull the lastBuildDate in the private void getLastBuild(). I'm not great with the whole nodes thing. Any help would be great on this last piece of the puzzle. Thanks!

Use LINQ-to-XML:
from buildDate in xmlData.Descendants("lastBuildDate")
select buildDate.Value
Where xmlData is the rss string you loaded.

dynamically add values to resources (C#)

I want to add values to the resources dynamically through codings(C#). My below coding runs without any error but the values are not getting added to the resource file.
protected void Button2_Click(object sender, EventArgs e)
{
using (ResXResourceWriter resx = new ResXResourceWriter("Resources.resx"))
{
resx.AddResource( "joth", "joth");
resx.Close();
}
}

protected void Button2_Click(object sender, EventArgs e)
{
using (ResXResourceWriter resx = new ResXResourceWriter("Resources.resx"))
{ resx.AddResource( "joth", "joth");
resx.Save();
resx.Close();
}
}

I tried the above it doesn't seem to work, I looked around and try editing the resx file like a xml file and it worked for me.
<data name="v13" xml:space="preserve">
<value>Test TEst</value>
</data>
Above is the structure of a single key/value pair in the resx file opened in nodepadd ++
XDocument doc = XDocument.Load(Server.MapPath(#"~\App_GlobalResources\myResource2.resx"));
XElement data = new XElement("data");
XNamespace ns = "xml";
data.Add(new XAttribute("name", "v13"));
data.Add(new XAttribute(XNamespace.Xml + "space", "preserve"));
data.Add(new XElement("value", "Test TEst"));
doc.Element("root").Add(data);
doc.Save(Server.MapPath(#"~\App_GlobalResources\myResource2.resx"));

Saving Xml to a Document C#

Unlike what I've been able to find on here I wand to maintain syntax within my xml document, and serialization doesn't touch on that. I want to be able to add another "task" tag to the xml document...Loading the information isn't a problem, I've had to deal with that before... but this is.
Main Program:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Xml;
using System.Xml.Linq;
using System.Xml.Serialization;
using System.IO;
namespace ToDoList
{
public partial class Form1 : Form
{
string title; //the variable for the title textbox value to be stored in
string details; //the variable for the details textbox value to be stored in
string itemstr; //the variable for title and details to be merged in
public Form1()
{
InitializeComponent();
}
public void Form1_Load(object sender, EventArgs e)
{
optionsbtn.Text = "Options"; //make the options button's text options
var items = ToDochkbox.Items; //create a private "var" items symbolizing the Checkbox's items array
XDocument xmlDoc = XDocument.Load("tasksdoc.xml"); //load the xml document (in bin or release)
var q = from c in xmlDoc.Descendants("root") //go "within" the <root> </root> tag in the file
select (string)c.Element("task"); //find the first <task></task> tag
foreach (string N in q) //now cycle through all the <task></task> tags and per cycle save them to string "N"
{
items.Add(N); //add the item to the checkbox list
}
}
public void addbtn_Click(object sender, EventArgs e)
{
var items = ToDochkbox.Items; //create a private "var" items symbolizing the Checkbox's items array
title = Addtb.Text; //set the title string to equal the title textbox's contents
details = detailstb.Text; //set the details string to equal the detail textbox's contents
itemstr = title +" - " + details; //set a variable to equal the title string, a - with spaces on each end, and then the details string
items.Add(itemstr); //add the variable itemstr (above) to the the checkbox list
}
private void optionsbtn_Click(object sender, EventArgs e)
{
new options().Show();//show the options form
}
private void aboutToolStripMenuItem_Click(object sender, EventArgs e)
{
new options().Show();//show the options form
}
private void saveToolStripMenuItem_Click(object sender, EventArgs e)
{
}
public void loadToolStripMenuItem_Click(object sender, EventArgs e)
{
optionsbtn.Text = "Options"; //make the options button's text options
var items = ToDochkbox.Items; //create a private "var" items symbolizing the Checkbox's items array
XDocument xmlDoc = XDocument.Load("tasksdoc.xml"); //load the xml document (in bin or release)
var q = from c in xmlDoc.Descendants("root") //go "within" the <root> </root> tag in the file
select (string)c.Element("task"); //find the first <task></task> tag
foreach (string N in q) //now cycle through all the <task></task> tags and per cycle save them to string "N"
{
items.Add(N); //add the item to the checkbox list
}
}
}
}
And My XML Document:
<root>
<task>First Task - Create a Task</task>
</root>

The class that you could use to serialize:
public class MyClass
{
[XmlElement("task")]
public List<string> Tasks { get; set; }
}
Placing the XmlElementAttribute on a collection type will cause each element to be serialized without being placed a node for the list.
Xml with XmlElementAttribute:
<root>
<task>First Task - Create a Task</task>
<task>SecondTask - Create a Task</task>
<task>ThirdTask - Create a Task</task>
</root>
Xml without XmlElementAttribute:
<root>
<Tasks>
<Task>First Task - Create a Task</Task>
<Task>SecondTask - Create a Task</Task>
<Task>ThirdTask - Create a Task</Task>
</Tasks>
</root>
I answered another question about serializing lists in a similar way a few days ago. Check out his question and then the answer, it might be what you are trying to do.

How to insert data into an existing xml file in asp.net?

I'm using Visual Web Developer 2008 Express Edition and I need your assistance since I'm new to it. I'm trying to insert or write a data to my xml file so that I can display it into my xml control. Now, what I'm trying to do here is everytime the user enter a message into the textbox he has an option to save it so if he clicks the command button I want to save the text message from the textbox into any elements of my xml file. Let say, I want to insert it in the element of my xml file. How do I do it using C# or VB.Net codes? I have my xml file below and my C# code but the c# code doesn't work for me. I need the code for that either in c# or vb.net, either way will work for me.
Thank you very much and I greatly appreciate any help that could be shared.
myxmlfile.xml
<?xml version="1.0" encoding="utf-8" ?>
<comments>
<comment>
Your Comments Here: Please post your comments now. Thank you.
</comment>
<comment2>
Note: Please do not post any profane languages.
</comment2>
<comment3>
I don't like their service. It's too lousy.
</comment3>
<comment4>
Always be alert on your duty. Don't be tardy enough to waste your time.
</comment4>
</comments>
code
protected void Button1_Click(object sender, EventArgs e)
{
System.Xml.Linq.XDocument mydoc =
new System.Xml.Linq.XDocument(
new System.Xml.Linq.XDeclaration("1.0", "UTF-8", "yes"),
new System.Xml.Linq.XElement("comment",
new System.Xml.Linq.XComment(TextBox1.Text)));
mydoc.Save("myxmlfile.xml",System.Xml.Linq.SaveOptions .None);
}
#Joseph LeBrech and #AVD --Thank you very much for your reply. That code would add a new root element in myxmlfile so the problem is that the new root element is not showing on my xml control when the page is reloaded because the new root element is not included on my xslt file to show the myxmlfile on the xml control. I don't want to add a new root element on myxmlfile. I just want to insert the messages entered from the textbox into the existing element of myxmlfile which is the element so that it can be shown on the xml control where i intend to display the myxmlfile. I hope you can modify the code for me again. Thank you very for your help. I greatly appreciated it.

You have to specify the absolute file path using MapPath() to save the XML document and don't increment tag name like comment1,comment2.. etc.
Take a look at code-snippet:
protected void Button1_Click(object sender, EventArgs e)
{
string file = MapPath("~/comments.xml");
XDocument doc;
//Verify whether a file is exists or not
if (!System.IO.File.Exists(file))
{
doc = new XDocument(new XDeclaration("1.0", "UTF-8", "yes"),
new System.Xml.Linq.XElement("comments"));
}
else
{
doc = XDocument.Load(file);
}
XElement ele = new XElement("comment",TextBox1.Text);
doc.Root.Add(ele);
doc.Save(file);
}
EDIT: If you want to insert <comment> tag into existing xml document then no need to create XDocument. Just load the existing document and add a new element at the root.
protected void Button1_Click(object sender, EventArgs e)
{
string file = MapPath("~/myxmlfile.xml");
XDocument doc = XDocument.Load(file);
XElement ele = new XElement("comment",TextBox1.Text);
doc.Root.Add(ele);
doc.Save(file);
}
To add another <comment> tag inside <comment>:
XElement ele = new XElement("comment",TextBox1.Text);
doc.Root.Element("comment").Add(ele);
doc.Save(file);
To replace the text value of <comment> tag:
doc.Root.Element("comment").Value = TextBox1.Text;
//doc.Root.Element("comment").Value += TextBox1.Text; //append text
doc.Save(file);
XML document :
<?xml version="1.0" encoding="utf-8" ?>
<comments> <!-- Root Node -->
<comment>First Child</comment>
<comment> <!-- Second Child -->
<comment>Nested</comment>
</comment>
</comments>

myDoc.Element("comments").Add(new xElement("comment5") { Value = "put the value in here"});

Design the page like this.In button click event write the following
code
protected void btnInsert_Click(object sender, EventArgs e)
{
System.Xml.XmlDocument myXml = new System.Xml.XmlDocument();
myXml.Load(Server.MapPath("InsertData.xml"));
System.Xml.XmlNode xmlNode = myXml.DocumentElement.FirstChild;
System.Xml.XmlElement xmlElement = myXml.CreateElement("entry");
xmlElement.SetAttribute("Name", Server.HtmlEncode(txtname.Text));
xmlElement.SetAttribute("Location", Server.HtmlEncode(txtlocation.Text));
xmlElement.SetAttribute("Email", Server.HtmlEncode(txtemail.Text));
xmlElement.SetAttribute("Gender", Server.HtmlEncode(ddlgender.SelectedItem.Text));
myXml.DocumentElement.InsertBefore(xmlElement,xmlNode);
myXml.Save(Server.MapPath("InsertData.xml"));
BindData();
lbldisplay.Text = "Record inserted into XML file successfully";
txtname.Text = "";
txtlocation.Text = "";
txtemail.Text = "";
}
private void BindData()
{
XmlTextReader xmlReader = new XmlTextReader(Server.MapPath("InsertData.xml"));
xmlReader.Close();
}
and also put events tag in xml file.
Now run the application and check the output

textbox value to be stored into a new node in xml file

i have a textbox for users to enter their new email address. they will click the "Update" button and this text that they entered will then create a new entry in an existing XML file. this xml file is used to populate 2 dropdownlist and needs to constantly update the dropdownlist with new updated entries that user entered.
i tried the following code snipper but i am weak at methods.. so please guide me
xml file: (eg i want a new builder entry)
<?xml version="1.0" encoding="utf-8"?>
<email>
<builderemail>
<builder>
<id>1</id>
<value>builder#xyz.com</value>
</builder>
<builder>
<id>2</id>
<value>Others</value>
</builder>
</builderemail>
<manageremail>
<manager>
<id>1</id>
<value>manager#xyz.com</value>
</manager>
<manager>
<id>2</id>
<value>Others</value>
</manager>
</manageremail>
</email>
so upon this button click i call the method AddNodeToXMLFile
protected void Button1_Click(object sender, EventArgs e)
{
AddNodeToXMLFile("~/App_Data/builderemail.xml", email);
}
public void AddNodeToXMLFile(string XmlFilePath, string NodeNameToAddTo)
{
//create new instance of XmlDocument
XmlDocument doc = new XmlDocument();
//load from file
doc.Load(XmlFilePath);
//create main node
XmlNode node = doc.CreateNode(XmlNodeType.Element, "builder", null);
//create the nodes first child
XmlNode ButtonName = doc.CreateElement("id");
//set the value
ButtonName.InnerText = "1";
//create the nodes second child
XmlNode url = doc.CreateElement("value");
//set the value
url.InnerText = "" + TextBox1.Text;
// add childes to father
node.AppendChild(id);
node.AppendChild(value);
// find the node we want to add the new node to
XmlNodeList l = doc.GetElementsByTagName(NodeNameToAddTo);
// append the new node
l[0].AppendChild(node);
// save the file
doc.Save(XmlFilePath);
}
i think there is something wrong with my code..many thanks for your help

You should write:
// add children to father
node.AppendChild(ButtonName);
node.AppendChild(url);
and you should check if your xmlnodelist contains any nodes to prevent exceptions:
if (l.Count > 0)
{
// append the new node
l[0].AppendChild(node);
}
For the rest it looks alright to me. Good luck!