Silverlight 图片进度化加载小工具类

快速将加载图片的过程可视化,后台化.

今天的小东西,在Silverlight.net上回答问题时候写的，共享了。

---------------------------------------------------------ImageLoader Class---------------------------------------------------------

 

//Created by Struggle-luan
//Thanks for using~

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Collections.Generic;
using System.Windows.Media.Imaging;

namespace Silverlight_ImageLoader
{
    public class ImageLoader
    {
        //FDS:
        private int ID_Count;
        public int TaskCount { get { return ID_Count; } }
        private double C_Progress;
        public double TaskProgress { get { return C_Progress / ID_Count; } }
        private List<ImageData> OperatingData;
        private Grid G_Temp;
        private Panel Container;
        private Dictionary<BitmapImage,int> ProgressCounter;
        private bool AvoidDoubleFinishes = false;

        //DELES:
        public delegate void D_ProgressChanged(ImageLoader Sender, double Progress);
        public delegate void D_TaskAllFinished(ImageLoader Sender,List<Image> DataOutPut);

        //PUB_EVENTS:
        public event D_ProgressChanged ProgressChanged;
        public event D_TaskAllFinished TaskFinished;

        //P_FUNCT"
        public void LoadImages(List<ImageData> RequestDataList,Panel VisibleContainer)
        {
            AvoidDoubleFinishes = false;
            ProgressCounter = new Dictionary<BitmapImage,int>();
            Container = VisibleContainer;
            OperatingData = RequestDataList;
            C_Progress = 0;
            ID_Count = RequestDataList.Count;
            G_Temp = new Grid();
            G_Temp.Height = 0;
            G_Temp.Width = 0;
            foreach (ImageData ID in OperatingData)
            {
                BitmapImage BI = new BitmapImage();
                ProgressCounter.Add(BI, 0);
                BI.DownloadProgress += new EventHandler<DownloadProgressEventArgs>(BI_DownloadProgress);
                BI.UriSource = ID.TargetURI;
                ID.TargetImagePointer.Source = BI;
                G_Temp.Children.Add(ID.TargetImagePointer);
            }
            Container.Children.Add(G_Temp);
        }

        //INNER_EVENTS:
        void BI_DownloadProgress(object sender, DownloadProgressEventArgs e)
        {
            ProgressCounter[sender as BitmapImage] = e.Progress;
            int Temp = 0;
            foreach (int i in ProgressCounter.Values)
            {
                Temp += i;
            }
            C_Progress = Temp;
            if (TaskProgress == 100 && (!AvoidDoubleFinishes))
            {
                List<Image> Ready = new List<Image>();
                foreach (ImageData ID in OperatingData)
                {
                    G_Temp.Children.Remove(ID.TargetImagePointer);
                    Ready.Add(ID.TargetImagePointer);
                }
                TaskFinished.Invoke(this,Ready);
                AvoidDoubleFinishes = true;
                Container.Children.Remove(G_Temp);
            }
            else
            {
                ProgressChanged.Invoke(this,TaskProgress);
            }
        }

    }


    public class ImageData
    {
        public Uri TargetURI { get; set; }
        public Image TargetImagePointer { get; set; }
    }
}

 

 

---------------------------------------------------------Page.xaml------------------------------------------------------------------------------------

<UserControl x:Class="Silverlight_ImageLoader.Page"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    >
    <Grid x:Name="LayoutRoot" Background="White">
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition Height="30"/>
        </Grid.RowDefinitions>
        <Button x:Name="TEST" Grid.Row="1" Content="Let's do it" Click="Test"/>
        <ScrollViewer VerticalScrollBarVisibility="Auto">
            <StackPanel x:Name="StackMain"/>
        </ScrollViewer>
    </Grid>
</UserControl>

 

----------------------------------------------------Page.xaml.cs---------------------------------------------------------

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Windows.Media.Imaging;

namespace Silverlight_ImageLoader
{
    public partial class Page : UserControl
    {
        public Page()
        {
            InitializeComponent();
            PB = new ProgressBar();
            LayoutRoot.Children.Add(PB);
            PB.Visibility = Visibility.Collapsed;
            PB.SetValue(Grid.RowProperty, 1);
        }

        ProgressBar PB;
        private void Test(object sender, RoutedEventArgs e)
        {
            PB.Maximum = 100;
            PB.Value = 0;
            PB.Visibility = Visibility.Visible;

            List<ImageData> LD = new List<ImageData>();
            LD.Add(new ImageData { TargetURI = new Uri("http://www.geobabble.org/~hnw/neon/withindomainrep2/withindomainrep2.neonIII.clustdist2.medium.png"), TargetImagePointer = new Image() });
            LD.Add(new ImageData { TargetURI = new Uri("http://www.astray.com/static/earth.png"), TargetImagePointer = new Image() });
            ImageLoader IL = new ImageLoader();
            IL.ProgressChanged += new ImageLoader.D_ProgressChanged(IL_ProgressChanged);
            IL.TaskFinished += new ImageLoader.D_TaskAllFinished(IL_TaskFinished);
            IL.LoadImages(LD, LayoutRoot);
        }

        void IL_TaskFinished(ImageLoader Sender, List<Image> DataOutPut)
        {
            PB.Visibility = Visibility.Collapsed;
            foreach (Image I in DataOutPut)
            {
                StackMain.Children.Add(I);
            }
        }

        void IL_ProgressChanged(ImageLoader Sender, double Progress)
        {
            PB.Value = Progress;
        }

        void B_DownloadProgress(object sender, DownloadProgressEventArgs e)
        {
            
        }
    }
}

 

以上就是所有的代码了。。。

 

至少解决了我自己的问题，弥补了Silverlight图片加载时候一片白，死机状的情景。。

下面的是Sample下载。。

觉得稍微有点作用的就拿这个类爽一爽。。

https://files.cnblogs.com/struggle-luan/SilverlightImgLoader.zip

 

（例子里面图片加载的大小大概是10mb左右。。Google上搜索HugePicture...）

 

 

小玩意，不值一提。。各位高手见笑了