- Details
- Written by: Stanko Milosev
- Category: C#
- Hits: 1370
<?xml version="1.0" encoding="utf-8"?>
<urlset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xhtml="http://www.w3.org/1999/xhtml" xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd" xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<url>
<loc>http://www.example.com/</loc>
<lastmod>2005-01-01</lastmod>
<changefreq>monthly</changefreq>
<priority>0.8</priority>
</url>
</urlset>
The model:
using System.Collections.Generic;
using System.Xml.Schema;
using System.Xml.Serialization;
namespace SiteMapXmlCreation
{
public class Model
{
[XmlRoot("urlset")]
public class Urlset
{
[XmlAttribute("schemaLocation", Namespace = XmlSchema.InstanceNamespace)]
public string SchemaLocation { get; set; }
[XmlElement(ElementName = "url")] public List<url> Url { get; set; }
}
public class url
{
[XmlElement(ElementName = "loc")] public string Loc { get; set; }
[XmlElement(ElementName = "lastmod")] public string Lastmod { get; set; }
[XmlElement(ElementName = "changefreq")] public string Changefreq { get; set; }
[XmlElement(ElementName = "priority")] public string Priority { get; set; }
}
}
}
The Program:
using System.Collections.Generic;
using System.IO;
using System.Xml.Serialization;
namespace SiteMapXmlCreation
{
class Program
{
static void Main(string[] args)
{
Model.Urlset serializedUrlset = new Model.Urlset
{
Url = new List<Model.url> {
new() {
Changefreq = "monthly"
, Lastmod = "2005-01-01"
, Loc = "http://www.example.com/"
, Priority = "0.8"
}
}
, SchemaLocation = "http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd"
};
TextWriter txtWriter = new StreamWriter(Path.ChangeExtension(System.Reflection.Assembly.GetEntryAssembly().Location, ".xml"));
XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
ns.Add(string.Empty, "http://www.sitemaps.org/schemas/sitemap/0.9");
ns.Add("xsi", "http://www.w3.org/2001/XMLSchema-instance");
ns.Add("xhtml", "http://www.w3.org/1999/xhtml");
XmlSerializer xmlSerializer = new XmlSerializer(typeof(Model.Urlset), "http://www.sitemaps.org/schemas/sitemap/0.9");
xmlSerializer.Serialize(txtWriter, serializedUrlset, ns);
txtWriter.Close();
}
}
}
Example download from here.
- Details
- Written by: Stanko Milosev
- Category: C#
- Hits: 1312
using System;
using System.Threading;
using System.Threading.Tasks;
namespace AwaitAsyncExample
{
class Program
{
static void Main(string[] args)
{
Task.Run(async () =>
{
await MultipleAwaits();
});
Console.ReadKey();
}
static async Task MultipleAwaits()
{
Task task1 = Task.Run(() =>
{
Thread.Sleep(2_000);
Console.WriteLine("Done with first task!");
});
Task task2 = Task.Run(() =>
{
Thread.Sleep(1_000);
Console.WriteLine("Done with second task!");
});
Task task3 = Task.Run(() =>
{
Thread.Sleep(1_000);
Console.WriteLine("Done with third task!");
});
await Task.WhenAll(task1, task2, task3);
}
}
}
Another example:
private static readonly Object ThisLock = new Object();
static void Main(string[] args)
{
Task.Run(async () =>
{
await MultipleAwaits();
});
Console.ReadKey();
}
static async Task MultipleAwaits()
{
Task task1 = Task.Run(() =>
{
lock (ThisLock)
{
File.AppendAllText("test.txt", "test 1");
}
});
Task task2 = Task.Run(() =>
{
lock (ThisLock)
{
File.AppendAllText("test.txt", "test 2");
}
});
Task task3 = Task.Run(() =>
{
lock (ThisLock)
{
File.AppendAllText("test.txt", "test 3");
}
});
await Task.WhenAll(task1, task2, task3);
}
Notice:
lock (ThisLock)
{
File.AppendAllText("test.txt", "test 2");
}
Without lock exception "The process cannot access the file 'test.txt' because it is being used by another process." will be raised.
One more example in Windows forms:
namespace AsyncTest;
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
btnStart.Click += DoSomeWork;
}
async void DoSomeWork(object sender, EventArgs e)
{
label1.Text = "start";
string text = await DoWait();
label1.Text = text;
}
private Task<string> DoWait()
{
Task<string> task1 = Task.Run(() =>
{
Thread.Sleep(2_000);
return Task.FromResult("did it");
});
return task1;
}
}
- Details
- Written by: Stanko Milosev
- Category: C#
- Hits: 1952
Create table with code like:
DataTable dtMaster = new DataTable("Master");
In this example I will add Columns without specifying type:
dtMaster.Columns.Add("Id");
Create new row:
DataRow drMaster = dtMaster.NewRow(); drMaster["Id"] = 1;Add row to DataTable:
dtMaster.Rows.Add(drMaster);Now details table:
DataTable dtDetail = new DataTable("Details");
dtDetail.Columns.Add("Id");
dtDetail.Columns.Add("FkDetailMasterId");
DataRow drDetail = dtDetail.NewRow();
drDetail["Id"] = 1;
drDetail["FkDetailMasterId"] = 1;
dtDetail.Rows.Add(drDetail);
Create DataSet and add relation:
DataSet ds = new DataSet();
ds.Tables.Add(dtMaster);
ds.Tables.Add(dtDetail);
DataRelation relMasterDetail = new DataRelation("MyRelation"
, ds.Tables["Master"].Columns["Id"]
, ds.Tables["Details"].Columns["FkDetailMasterId"]
);
ds.Relations.Add(relMasterDetail);
Example download from here.
- Details
- Written by: Stanko Milosev
- Category: C#
- Hits: 1696
MethodInfoClass mic = new MethodInfoClass();
const BindingFlags bindingFlags = BindingFlags.InvokeMethod |
BindingFlags.Public |
BindingFlags.NonPublic |
BindingFlags.Static |
BindingFlags.Instance;
System.Reflection.MethodInfo privateTestMethod = typeof(MethodInfoClass).GetMethod("PrivateTestMethod", bindingFlags);
if (privateTestMethod is not null)
{
string returnFromPrivateTestMethod = (string)privateTestMethod.Invoke(mic, null);
Console.WriteLine($"privateTestMethod: {returnFromPrivateTestMethod}");
}
Example project download from here.