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Silverlight DataBindings for 1.1 (Managed code)

silverlight   发布时间：2022-05-04  发布网站：大佬教程  code.js-code.com
大佬教程收集整理的这篇文章主要介绍了Silverlight DataBindings for 1.1 (Managed code)，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。

概述

  Silverlight DataBindings for 1.1 (Managed codE)     文 / 黃忠成      RC1方興未艾， RC2已在路上了，看來1.0 Release之日不遠了！前面一篇文章利用了PageMethods與JavaScript為Silverlight 1.0RC加上DataBindings的功能，此次舞台換到了Silverlight 1.1 Alpha
 
Silverlight DataBindings for 1.1 (Managed codE)
 
 
文 / 黃忠成
 
   RC1方興未艾， RC2已在路上了，看來1.0 Release之日不遠了！前面一篇文章利用了PageMethods與JavaScript為Silverlight 1.0RC加上DataBindings的功能，此次舞台換到了Silverlight 1.1 Alpha @R_618_7017@h及Visual studio 2008 Beta 2上，與1.1時不同，這次已無法用單一的Web Site模式實作，基於ASP.NET Ajax與Silverlight所使用的CLR Runtime不同，我們必須將Silverlight與ASP.NET Ajax拆開，別誤會！這並非意味你無法將Silverlight與ASP.NET Ajax放在同一個虛擬目錄下，Silverlight 1.1使用的Binary目錄是ClientBin，ASP.NET是Bin，兩者並無衝突，限制只在於你必須將Silverlight與ASP.NET Ajax分成兩個Project來編譯，在Silverlight編譯完成後將.xaml、.js複製到ASP.NET Ajax的專案目錄下，再將.dll複製到ASP.NET Ajax的ClientBin目錄下即可。回到主題，在Silverlight 1.1中，實現Data Bindings除了可以用前一篇文章的JavaScript技巧外，還多了一個選擇，那就是使用C#等Managed的語言，SLDH.js的C#版本如下。
 
SLDH.cs
/////////////////////////////////////////////////////////////////////////
// Silverlight Data Binding Helper 0.1 for Silverlight 1.1 Alpha @R_618_7017@h
/////////////////////////////////////////////////////////////////////////
using System;
using System.Text;
using System.IO;
using System.Net;
using System.Reflection;
using System.Linq;
using System.Collections.Generic;
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.Windows.browser.Net;
using System.Windows.browser.serialization;
 
namespace SilverlightDataHelper
{
    public class JSONDa@R_795_2301@w
    {
        private List<object> _columns;
        private List<object> _values;
 
        public object this[int index]
            get
            {
                return _values[index];
            }
 
        public object this[String name]
            get
            {
                for (int i = 0; i < _columns.Count; i++)
                    if (((String)_columns[i]).Equals(Name))
            }
 
        internal JSONDa@R_795_2301@w(object[] columns,object[] values)
            _columns = new List<object>(columns);
            _values = new List<object>(values);
    }
 
    public class BindingData
    {
        private bool _bindingComplete = false;
        private String _bindingProperty = String.Empty;
        private String _bindingField = String.Empty;
        private FrameworkElement _control;
        private String _format = String.Empty;
        private PropertyInfo _cachedProp = null;
 
        public bool BindingComplete
            get
            {
                return this._bindingComplete;
            }
 
        public String BindingProperty
            get
            {
                return _bindingProperty;
            }
 
        public String BindingField
            get
            {
                return _bindingField;
            }
 
        public FrameworkElement Control
            get
            {
                return _control;
            }
 
        public String Format
            get
            {
                return _format;
            }
            set
            {
                _format = value;
            }
 
        public void updateValue(JSONDa@R_795_2301@w dataItem)
            if (_bindingCompletE)
            {
                if (_cachedProp == null)
                    _cachedProp = _control.GetType().GetProperty(_bindingProperty);
                    if (_cachedProp == null)
                if (_cachedProp != null && Format != String.Empty)
                    if (_cachedProp.propertyType == typeof(Uri))
                        Uri uri = new Uri(String.Format(Format,
                               dataItem[BindingField]),UriKind.RelativE);
                        _cachedProp.SETVALue(_control,uri,null);
                        _cachedProp.SETVALue(_control,String.Format(Format,
dataItem[BindingField]),null);
                else if (_cachedProp != null)
                    _cachedProp.SETVALue(_control,dataItem[BindingField],null);
            }
 
        public BindingData(FrameworkElement ctrl,String bindingExpression)
            String[] bindings = bindingExpression.Split(';');
            _bindingComplete = false;
            _control = ctrl;
            for (int i = 0; i < bindings.Length; i++)
            {
                String[] temp = bindings[i].Split(':');
                if (temp.Length != 2)
                    _bindingComplete = false;
                    return;
                if (temp[0].ToLower() == "bindingfield")
                    _bindingField = temp[1];
                else if (temp[0].ToLower() == "bindingproperty")
                    _bindingProperty = temp[1];
                else if (temp[0].ToLower() == "format")
                    _format = temp[1];
            }
            if (_bindingField != String.Empty &&
               _bindingProperty != String.Empty)
                _bindingComplete = true;
    }
 
    public class BindingContext
    {
        private Panel _container;
        private List<BindingData> _bindingControls = null;
        private bool _bindingComplete = false;
        private int _position = 0;
        private int _count = -1;
        private String _serviceUrl = String.Empty;
        private String _bindingMethod = String.Empty;
        private String _bindingCountMethod = String.Empty;
        private String _countMethod = String.Empty;
 
 
        public int Position
            get
            {
                return _position;
            }
            set
            {
                if (_position != value && value < Count && value >= 0)
                    _position = value;
            }
 
        public int Count
            get
            {
                return _count;
            }
 
        public bool BindingComplete
            get
            {
                return _bindingComplete;
            }
 
        public List<BindingData> BindingControls
            get
            {
                if (_bindingControls == null)
                    _bindingControls = new List<BindingData>();
                return _bindingControls;
            }
 
        private void ChildWorker(FrameworkElement elem)
            String expRSSsion = elem.Tag == null ? String.Empty : elem.Tag;
            BindingData data = new BindingData(elem,expRSSsion);
            if (data.bindingCompletE)
                BindingControls.Add(data);
            if (elem is Panel)
            {
                Panel pnl = (Panel)elem;
                for (int i = 0; i < pnl.Children.Count; i++)
                    if (pnl.Children[i] is FrameworkElement)
                        ChildWorker((FrameworkElement)pnl.Children[i]);
            }
 
        private void FetchCount()
            BrowserhttpWebrequest request =
                    new BrowserhttpWebrequest(new Uri(_serviceUrl + "/" +
            request.ContentType = "application/json; charset=utf-8";
            request.Method = "POST";
            request.ContentLength = 0;
            request.Referer = System.Windows.browser.HtmlPage.DocumentUri.AbsolutePath;
            request.Accept = "/*/";
            httpWebResponse response = request.GetResponse();
            StreamReader sr = new StreamReader(response.GetResponseStream());
            JavaScriptserializer serializer = new JavaScriptserializer();
            String data = sr.ReadToEnd();
            _count = serializer.Deserialize<int>(data);
            sr.Close();
            response.Close();
            request.Close();
 
        private JSONDa@R_795_2301@w FetchData(int indeX)
            BrowserhttpWebrequest request =
                new BrowserhttpWebrequest(new Uri(_serviceUrl + "/" +
            JavaScriptserializer serializer = new JavaScriptserializer();
            request.ContentType = "application/json; charset=utf-8";
            request.Method = "POST";
            request.Referer = System.Windows.browser.HtmlPage.DocumentUri.AbsolutePath;
            request.Accept = "/*/";
            Stream reqStream = request.GetrequestStream();
            byte[] buff = Encoding.UTF8.GetBytes("{index:" + index.ToString() + "}");
            reqStream.Write(buff,buff.Length);
            request.ContentLength = buff.Length;
            httpWebResponse response = request.GetResponse();
            StreamReader sr = new StreamReader(response.GetResponseStream());
            String data = sr.ReadToEnd();
            sr.Close();
            response.Close();
            request.Close();
            object[] parsedData = serializer.Deserialize<object[]>(data);
            return new JSONDa@R_795_2301@w((object[])parsedData[0],(object[])parsedData[1]);
 
 
        private void updateBinding()
            JSONDa@R_795_2301@w row = FetchData(Position);
            foreach (BindingData item in BindingControls)
 
        public void Initialize()
            ChildWorker(_container);
            FetchCount();
            updateBinding();
 
        public BindingContext(Panel container)
            _container = container;
            if (_container.Tag == null)
            {
                _bindingComplete = false;
            }
            String[] parseBinding = container.Tag.Split(':');
            _bindingComplete = false;
            if (parseBinding.Length == 2 && parseBinding[0].ToLower() == "bindingcontext")
            {
                String[] bindingMethods = parseBinding[1].Split(',');
                if (bindingMethods.Length == 3)
                    _serviceUrl = bindingMethods[0];
                    _bindingMethod = bindingMethods[1];
                    _bindingCountMethod = bindingMethods[2];
                    _bindingComplete = true;
            }
            if (_bindingCompletE)
                ChildWorker(container);
    }
}
ㄟ...程式碼變長了哦~~~ >"<，在某些情況下，Managed Code不見得比JavaScript簡單吧！只是別忘了，這些程式碼是預先編譯後再下載到客戶端，由Silverlight CLR執行的，就理論上來說，執行效率應該比JavaScript好才對。由於Managed SLDH使用了另一種JSON格式來交換資料，所以.aspx.cs也要做一些調整。
Default.aspx.cs
using System;
using System.IO;
using System.Data;
using System.Collections.Generic;
using System.Data.sqlClient;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Xml.Linq;
using System.Web.services;
 
public partial class _Default : System.Web.UI.Page
{
    private static DataTable BuildDataCache()
    {
        if (httpRuntime.Cache["DataCache_employees"] != null)
            return httpRuntime.Cache["DataCache_employees"] as DataTable;
            using (sqlConnection conn = new sqlConnection(ConfigurationManager.ConnectionStrings["
ConnectionString" ].ConnectionString))
            {
                sqlDataAdapter adapter = new sqlDataAdapter(
"SELECT * FROM employees ORDER BY employeEID" ,conn);
                DataTable table = new DataTable("employees");
                adapter.Fill(tablE);
                httpRuntime.Cache["DataCache_employees"] = table;
            }
    }
 
    private static List<object> BuildJSONRow(Da@R_795_2301@w row)
    {
        List<object> result = new List<object>();
        List<String> columns = new List<String>();
        List<object> values = new List<object>();
        foreach (Datacolumn col in row.Table.columns)
            values.Add(row.IsNull(col) ? String.Empty : row[col].ToString());
        result.Add(columns);
        result.Add(values);
        return result;
    }
 
    [WebMethod]
    public static List<object> GetData(int indeX)
    {
        DataTable table = BuildDataCache();
        return BuildJSONRow(table.DefaultView[index].Row);
    }
 
    [WebMethod]
    public static int GetCount()
    {
        DataTable table = BuildDataCache();
        return table.DefaultView.Count;
    }
 
    protected void Page_Load(object sender,EventArgs E)
    {
        if (request.QueryString["ID"] != null &&
           request.QueryString["ID"].Length > 0)
            using (sqlConnection conn = new sqlConnection(ConfigurationManager.ConnectionStrings[
"ConnectionString" ].ConnectionString))
            {
                sqlCommand cmd = new sqlCommand(
"SELECT Photo FROM employees WHERE employeEID = @ID" ,conn);
                cmd.Parameters.AddWithValue("@ID",request.QueryString["ID"]);
                object data = cmd.ExecuteScalar();
                if (data != null && ((byte[])data).Length > 0)
                    Response.Clear();
                    Response.bufferOutput = true;
                    Response.ContentType = "image/jpeg";
                    @H_760_198@memoryStream ms = new @H_760_198@memoryStream();
                    ms.Write(((byte[])data),78,((byte[])data).Length - 78);
                    @H_760_198@memoryStream jpegms = new @H_760_198@memoryStream();
                    System.Drawing.Image.FromStream(ms).Save(jpegms,
System.Drawing.Imaging.ImageFormat.Jpeg);
                    jpegms.Position = 0;
                    response.outputStream.Write(jpegms.GetBuffer(),(int)jpegms.Length);
                    ms.Dispose();
                    jpegms.Dispose();
                    Response.Flush();
                    Response.End();
            }
    }
}
當需要做DataBindings時，只需要在.xaml.cs的Page_Loaded事件處理函式中建立此物件即可，見下面程式碼。
 
Page.xaml
< Canvas x:Name = "parentCanvas"
        xmlns = "http://scheR_107_11845@as.microsoft.com/client/2007"
        xmlns:x = "http://scheR_107_11845@as.microsoft.com/winfx/2006/xaml"
        Loaded = "Page_Loaded"
        x:Class = "SilverlightProject1.Page;assembly=ClientBin/SilverlightProject1.dll"
        Width = "640"
        Height = "480"
        BACkground = "White"
           < Canvas Name = "DataDemo"Height="600"Width="800"
  Tag = "BindingContext:Default.aspx,GetData,GetCount">
                     < Canvas.BACkground >
                     </ Canvas.BACkground >
           < TextBlock Tag = "BindingField:employeEID;BindingProperty:Text"
          Name = "txtemployeEID"Width="144"Height="24"Canvas.Left="166"
        Canvas.Top = "23"Text="A00001"textwrapping="Wrap"/>
                     < TextBlock Tag = "BindingField:LastName;BindingProperty:Text"
            Name = "txtLastName"Width="320"Height="24"Canvas.Left="500"
          Canvas.Top = "23"Text="Alean Company"textwrapping="Wrap"/>
                     < TextBlock Tag = "BindingField:FirstName;BindingProperty:Text"Name="txtFirstName"
                      Width = "320"Height="24"Canvas.Left="166"Canvas.Top="72"
                      Text = "jeffray"textwrapping="Wrap"/>
                     < TextBlock Tag = "BindingField@R_984_6964@;BindingProperty:Text"
                      Name = "txttitle"Width="576"Height="24"Canvas.Left="166"
                      Canvas.Top = "122"Text="Taipen 101"textwrapping="Wrap"/>
                     < TextBlock Tag = "BindingField:hiredate;BindingProperty:Text"Name="txthiredate"
                      Width = "576"Height="24"Canvas.Left="166"Canvas.Top="171"
                      Text = "2005/3/4"textwrapping="Wrap"/>
                     < Image Name = "imgPhoto" 
Tag = "BindingField:employeEID;BindingProperty:source;Format:Default.aspx?ID={0}"
       Width = "357"Height="206"Canvas.Left="400"Canvas.Top="301">
                     </ Image >
                     < TextBlock Name = "txtLabel1"Width="114"Height="24"Canvas.Left="18"
           Canvas.Top = "23"Text="employee ID:"textwrapping="Wrap"/>
                     < TextBlock Name = "txtLabel1_Copy"Width="120"Height="24"Canvas.Left="349"
             Canvas.Top = "23"Text="last name:"textwrapping="Wrap"/>
                     < TextBlock Name = "txtLabel1_Copy1"Width="130"Height="24"Canvas.Left="18"
             Canvas.Top = "72"Text="First Name:"textwrapping="Wrap"/>
                     < TextBlock Name = "txtLabel1_Copy2"Width="104"Height="24"Canvas.Left="18"
           Canvas.Top = "122"Text="title :"textwrapping="Wrap"/>
                     < TextBlock Name = "txtLabel1_Copy3"Width="93"Height="24"Canvas.Left="18"
             Canvas.Top = "171"Text="Hire Date:"textwrapping="Wrap"/>
           </ Canvas >
           < TextBlock Canvas.Left = "100"Canvas.Top="200"
Text = "Prev"@H_823_2656@mouSELEftButtonDown="OnPrevClick"/>
           < TextBlock Canvas.Left = "150"Canvas.Top="200"
Text = "Next"@H_823_2656@mouSELEftButtonDown="OnNextClick"/>
</ Canvas >
 
Page.xaml.cs
using System;
using System.Linq;
using System.Collections.Generic;
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;
 
namespace SilverlightProject1
{
    public partial class Page : Canvas
    {
        private SilverlightDataHelper.bindingContext _context = null;
        public void Page_Loaded(object o,EventArgs E)
            // required to initialize variables
            InitializeComponent();
            _context = new SilverlightDataHelper.bindingContext(FindName("DataDemo") as Panel);
            _context.Initialize();
 
        void OnPrevClick(object sender,EventArgs args)
            if (_context.Position > 0)
            {
                ((Storyboard)FindName("imgAnimation")).begin();
            }
 
        void OnNextClick(object sender,EventArgs args)
            if (_context.Position < _context.Count)
            {
                ((Storyboard)FindName("imgAnimation")).begin();
            }
    }
}
下圖是執行畫面。

Silverlight DataBindings for 1.1 (Managed code)

 
(你需要將Northwind.mdf、Northwind_log.ldf複製到App_Data目錄下，或是修改web.config中的ConnectionString來連結到北風資料庫)
 

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标签：11.1codedatabindingsmanagedsilverlight
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