Silverlike » C#

Simple File Upload Solution

admin — Wed, 18 Nov 2009 12:18:50 +0000

Gergely Orosz target to implement a simple solution in uploading file using Silverlight. The upload control contains a progress indicator where you can keep track of the upload progress. The sample also showed you how you can collect the uploaded file using PHP or C#.

Website: Click here

Download: Click here

Strip HTML Tags

admin — Fri, 09 Oct 2009 22:15:20 +0000

Corey referred a very useful code snippet provided by John which helps you to strip HTML Tags.

Silverlight Demo: Click here to view

csharp title:

private string StripHtmlTags(string value){
    int length = 0;
    int.TryParse(value, out length);

    // Remove HTML tags and empty newlines and spaces and leading spaces
    string formattedValue = Regex.Replace(value as string, "<.*?>", "");
    formattedValue = Regex.Replace(formattedValue, @"\n+\s+", "\n\n");
    formattedValue = formattedValue.TrimStart(' ');
    formattedValue = HttpUtility.HtmlDecode(formattedValue);
    if(length > 0 && formattedValue.Length >= length)
        formattedValue = formattedValue.Substring(0, length - 1);
    return formattedValue;
}

Website: Click here

Data Driven Services with Silverlight 2: Click here

Checking Image Download Progress

admin — Mon, 28 Sep 2009 06:02:58 +0000

This application demonstrated how we may check the download progress of an image. The progress is visualized with a Progress Bar.

Silverlight Demo: Click here to view

Check the download progress:

// C#
BitmapImage bitmapImage = new BitmapImage();
bitmapImage.DownloadProgress += new EventHandler(bitmapImage_DownloadProgress);
bitmapImage.UriSource = new Uri(URL, UriKind.Absolute);
Image newImage = new Image() { Source = _bitmapImage };  

void bitmapImage_DownloadProgress(object sender, DownloadProgressEventArgs e)
{
    int progress = e.Progress; // 0 = 100  

    if (e.Progress == 100)
    {
        // finish
    }
}

Website: Click here

Download: Click here

Create Path in C# and XAML

admin — Thu, 24 Sep 2009 10:40:13 +0000

Matthias Shapiro demonstrated how you create a geometry object using C# and XAML.

View: Click here

Download: Click here

Create Gradient Background

admin — Sun, 27 Sep 2009 06:50:04 +0000

Most of the time when you are using Visual Studio and you don’t’ want to open Blend for just setting a very Gradient Background! The below code can surely help you.

Creat gradient background in c#:

LinearGradientBrush linear = new LinearGradientBrush();
linear.StartPoint = new Point(0.5, 0);
linear.EndPoint = new Point(0.5, 1);

GradientStop g1 = new GradientStop();
g1.Color = _backgroundColor1;
g1.Offset = 0;

GradientStop g2 = new GradientStop();
g2.Color = _backgroundColor2;
g1.Offset = 1;

linear.GradientStops.Add(g2);
linear.GradientStops.Add(g1);

Border border = new Border();
border.Background = linear;

Creating gradient background in xaml:

Silverlight Demo: Click here to view

Website: Click here

Upload file using File Dialog

admin — Sun, 27 Sep 2009 06:52:55 +0000

The coding below demonstrating how you might utilize your FileDialog to upload files from your local disk to server.

The code demonstrated the following:

Limited the selection of JPG and PNG files only
Only 1 file can be selected
Upload the file with the corresponding file name
How to get the file data inside PHP

Select and upload file in c#:

OpenFileDialog dialog = new OpenFileDialog();
dialog.Filter = "Image Files (.jpg,.png)|*.JPG;*.jpg;*.PNG;*.png";
dialog.FilterIndex = 1;
bool? userClickedOK = _imageDialog.ShowDialog();

// Process input if the user clicked OK.
if (userClickedOK == true)
{
    UploadFile(dialog.File.Name, dialog.File.OpenRead());
}

private void UploadFile(string filename, Stream data)
{
    UriBuilder ub = new UriBuilder(UPLOAD_PATH);
    ub.Query = string.Format("filename={0}", filename);

    WebClient c = new WebClient();
    c.OpenWriteCompleted += (sender, e) =>
    {
        PushData(data, e.Result);
        e.Result.Close();
        data.Close();
    };
    c.OpenWriteAsync(ub.Uri, "Post");
}

private void PushData(Stream input, Stream output)
{
    byte[] buffer = new byte[4096];
    int bytesRead;

    while ((bytesRead = input.Read(buffer, 0, buffer.Length)) != 0)
    {
        output.Write(buffer, 0, bytesRead);
    }
}

Get and save file in PHP:

$filepath = $_REQUEST['filename'];
$handle = fopen("php://input", "r");
$file = fopen($filepath,"w");

if($file != null && $handle != null)
{
        while ($data = fread($handle, 8192)) fwrite($file, $data);
        fclose($handle);
        fclose($file);
}

Website: Click here

Loading external assembly

admin — Sun, 27 Sep 2009 06:46:51 +0000

Terence Tsang demonstrated how to load an external assembly library (Usually a dll or xap file) into your own Silverlight application. This is a very effective method to minimize the application file size.

Loading external library in C#:

WebClient downloader = new WebClient();
downloader.OpenReadCompleted += new OpenReadCompletedEventHandler(onDownloadCompleted);
downloader.OpenReadAsync(new Uri(DLL_PATH, UriKind.Absolute));  

// Once the assembly is downloaded
private void onDownloadCompleted(object o, OpenReadCompletedEventArgs args)
{
    try
    {
        AssemblyPart ap = new AssemblyPart();
        Assembly assembly = ap.Load(args.Result);
        Object control = assembly.CreateInstance(CLASS_NAME);
    }
    catch (Exception e){}
}

Website: Click here

Download: Click here

Load & Save File from Isolated Storage

admin — Sun, 27 Sep 2009 09:36:25 +0000

Mike Snow demonstrated how to read file and load file from local storage. Please read the C# for details.

Save and read file from local storage:

using System;
using System.Windows.Controls;
using System.IO.IsolatedStorage;
using System.IO;

namespace SilverlightApplication10
{
    public class Page : UserControl
    {
        public Page()
        {
            SaveData("Hello There", "MyData.txt");
            if (HasFile("MyData.txt"))
            {
                string test = LoadData("MyData.txt");
            }
        }

        private void SaveData(string data, string fileName)
        {
            IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForApplication();
            IsolatedStorageFileStream isfs = new IsolatedStorageFileStream(fileName, FileMode.Create, isf);
            using (StreamWriter sw = new StreamWriter(isfs))
            {
                sw.Write(data);
                sw.Close();
            }
        }

        private bool HasFile(string fileName)
        {
            IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForApplication();
            return isf.FileExists(fileName);
        }

        private string LoadData(string fileName)
        {
            string data = String.Empty;
            IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForApplication();
            IsolatedStorageFileStream isfs = new IsolatedStorageFileStream(fileName, FileMode.Open, isf);
            using (StreamReader sr = new StreamReader(isfs))
            {
                string lineOfData = String.Empty;
                while ((lineOfData = sr.ReadLine()) != null) data += lineOfData;
            }
            return data;
        }
    }
}

Website: Click here

Clip/Mask To Actual Size

admin — Sun, 27 Sep 2009 09:30:33 +0000

Colin Eberhardt created a very useful Clipping behavior class which helps you do clipping easily. The behavior can detect the ActualHeight and ActualWidth at run time and create a RectangleGeometry() to Clip your Grid.

c# implementation of the behavior:

using System;
using System.Windows;

namespace Namespace
{

    public class Clip
    {
        public static bool GetToBounds(DependencyObject depObj)
        {
            return (bool)depObj.GetValue(ToBoundsProperty);
        }

        public static void SetToBounds(DependencyObject depObj, bool clipToBounds)
        {
            depObj.SetValue(ToBoundsProperty, clipToBounds);
        }

        /// 
        /// Identifies the ToBounds Dependency Property.
        /// 
        public static readonly DependencyProperty ToBoundsProperty =
        DependencyProperty.RegisterAttached("ToBounds", typeof(bool),
        typeof(Clip), new PropertyMetadata(false, OnToBoundsPropertyChanged));

        private static void OnToBoundsPropertyChanged(DependencyObject d,
        DependencyPropertyChangedEventArgs e)
        {
        FrameworkElement fe = d as FrameworkElement;
        if (fe != null)
        {
            ClipToBounds(fe);

            // whenever the element which this property is attached to is loaded
            // or re-sizes, we need to update its clipping geometry
            fe.Loaded += new RoutedEventHandler(fe_Loaded);
            fe.SizeChanged += new SizeChangedEventHandler(fe_SizeChanged);

        }
        }

        /// 
        /// Creates a rectangular clipping geometry which matches the geometry of the
        /// passed element
        /// 
        private static void ClipToBounds(FrameworkElement fe)
        {
        if (GetToBounds(fe))
        {
            fe.Clip = new RectangleGeometry()
            {
            Rect = new Rect(0, 0, fe.ActualWidth, fe.ActualHeight)
            };
        }
        else
        {
            fe.Clip = null;
        }
        }

        static void fe_SizeChanged(object sender, SizeChangedEventArgs e)
        {
            ClipToBounds(sender as FrameworkElement);
        }

        static void fe_Loaded(object sender, RoutedEventArgs e)
        {
            ClipToBounds(sender as FrameworkElement);
        }
    }
}

sample usage in XAML:

Website: Click here

Download: Click here

Hit Test (Get all objects in a specific point)

admin — Thu, 24 Sep 2009 10:55:00 +0000

Most of the time, when you are creating games, you will have to find out all the UIElemetn in a specific coordinate. (Or we can this hittest). In such circumstance, you will need to use the method VisualTreeHelper.FindElementsInHostCoordinates. Please view the C# coding for more details.

Get all the UIElement in a specific coordinate:


using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Shapes;

namespace HitTest
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();

            Loaded += new RoutedEventHandler(MainPage_Loaded);
        }

        void MainPage_Loaded(object sender, RoutedEventArgs e)
        {
            App.Current.RootVisual.MouseLeftButtonDown += new MouseButtonEventHandler(RootVisual_MouseLeftButtonDown);
        }

        void RootVisual_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            List list = VisualTreeHelper.FindElementsInHostCoordinates
            (e.GetPosition(null), LayoutRoot as UIElement) as List;

            var selectedControls = from control in list
                                   where control is Rectangle
                                   select control as Rectangle;

            if (selectedControls.Count() > 0)
            {
                foreach (var selectedControl in selectedControls)
                {
                    // do your opreation here
                }
            }
        }
    }
}

Website: Click here