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Most software projects get off to a rocky start. It s hard to predict what strategies will work best for the unique circumstances of a project team before you begin to accumulate real experience. Many troubled projects have gone on to eventual success because the team took time out from their day-to-day development work to think about how to improve or fix their processes. One of the benefits of using iterations is that they provide a natural rhythm for these reviews. Another is that the process for finishing up the iteration provides important feedback on how well, or how badly, the project is progressing. Crystal encourages teams to hold a reflection workshop every few weeks to identify the practices, conventions, and habits that work, and to find alternatives for the ones that don t. The team can test different strategies until they find one that works for them. This reflection workshop isn t intended to substitute for iteration planning and review meetings, but reflection could also occur in those meetings if the team is encouraged to contribute issues and suggestions in them.

this.ChartLabels = new List<string>(); } public String BuildUrl() { StringBuilder sb = new StringBuilder(); sb.Append(ChartBaseUrl); switch (ChartType) { case ChartTypeEnum.LineLC: sb.Append("cht=lc"); break; case ChartTypeEnum.LineLS: sb.Append("cht=ls"); break; case ChartTypeEnum.LineXY: sb.Append("cht=lxy"); break; } // Build data string sb.Append("&chd=t:"); for (int i = 0; i < ChartData.Count; i++) { if (i>0) sb.Append(","); sb.Append(ChartData[i]); } // Build label string sb.Append("&chl="); for (int i = 0; i < ChartLabels.Count; i++) { if (i > 0) sb.Append("|"); sb.Append(HttpUtility.UrlEncode(ChartLabels[i])); } // Build chart size sb.Append("&chs=" + ChartWidth + "x" + ChartHeight); return sb.ToString(); } } The code in Listing 14 8 defines a class whose BuildUrl method constructs a chart image URL such as the following: The next big improvement we can make is to implement an ASP.NET web handler that sends chart requests to Google and returns the binary image data. Consequently, the user s browser never connects to Google only to the SharePoint server. This technique has the advantage that it also works on secured HTTPS/SSL connections. An example for a web handler that requests data from Google is shown in Listing 14 9.

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Do not use the RIA link between the Silverlight applications and the web project. Instead, place domain services into separate Microsoft .NET RIA Services class library projects, and only add references to the libraries that the Silverlight application requires.

Listing 14 9. GoogleChartHandler.ashx for Requesting Charts from Google <%@ WebHandler Language="C#" Class="GoogleChartHandler" %> using using using using System; System.Web; System.Net; System.IO;

public class GoogleChartHandler : IHttpHandler { public bool IsReusable { get { return true;} } public void ProcessRequest(HttpContext context) { context.Response.ContentType = "image/jpeg"; context.Response.BufferOutput = false; // Get the Google image source string googleImage = context.Request.QueryString["GrabUrl"]; if (googleImage == null) return; HttpWebRequest request = (HttpWebRequest)WebRequest.Create(googleImage); try { HttpWebResponse MyResponse = (HttpWebResponse)request.GetResponse(); if (HttpStatusCode.OK == MyResponse.StatusCode) { using (Stream MyResponseStream = MyResponse.GetResponseStream()) { // 4K buffer byte[] buffer = new byte[4096]; int bytesRead; while (0 < (bytesRead = MyResponseStream.Read(buffer, 0, buffer.Length))) { context.Response.OutputStream.Write(buffer, 0, bytesRead); } } } } catch (Exception ex) { throw new Exception("Error: " + ex.Message, ex); } } } GoogleChartHandler.ashx expects a GrabUrl query string containing the URL of the Google Chart API to grab. The following line shows how to use it: imgChart.ImageUrl = "GoogleChartHandler.ashx GrabUrl=" + HttpUtility.UrlEncode(gc.BuildUrl());

When a Silverlight application has an RIA link with a web project, all services and types declared in the web project as well as all domain services referenced within the web project are made available via the RIA link in the code-generated file to all associated Silverlight applications that take advantage of .NET RIA Services.

As a result the image is displayed as if it were received directly from the server. The user is unaware of the source of the image (see Figure 14 25).

Caution Be aware that all chart data is sent to Google. Even if you use an ASP.NET web handler, the data is sent over the Internet, and because the query string contains the data, it may be readable within log files of switches, routers, proxies, and such. Don t use the Google Chart API for business-critical data!

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