When implementing an auto-complete control on your site, you may want to cache the results to keep the database queries to a minimum. Here’s a quick way to do that:
I’ve continued enhancing the Stanza catalog I created earlier. New features include purchase links and Google Analytics tracking. I reverse-engineered the FeedBooks API and the AllRomanceBooks.com feeds to figure out how to do some of these things. Also I’ve been reading the OPDS spec (an industry-standard successor to the Stanza format) to add support for e-readers on other platforms. For example Aldiko officially supports OPDS, but it recognizes Stanza tags as well. It crashes if you try to open a PDF file however – so it just needs to be sent the right mime type.
Here’s the snippet where I reference the custom Analytics class I added:
p.StoreDescription+= Mises.Domain.Mobile.Analytics.GetAnalyticsImageTag(this.request.RequestContext.HttpContext);
var content =new TextSyndicationContent(p.StoreDescription,
TextSyndicationContentKind.Html);
item.Content= content;
And here’s how to add external links to a book info view:
item.Links.Add(new SyndicationLink(new Uri(string.Format("http://mises.org/store/Product.aspx?ProductId={0}&utm_source=MisesCatalog", p.ProductId)), "alternate", "Purchase at the Mises Store",
"text/html", 0));
Easy enough, but if you follow their example exactly for a file and use File.ReadAllText() to get the string, you will get the wrong MD5 string for binary files. Instead, use File.ReadAllBytes() to bypass encoding issues. (This also applies to SHA1 hashing.)
privatestaticstring GetMD5Hash(string filePath){byte[] computedHash =new MD5CryptoServiceProvider().ComputeHash(File.ReadAllBytes(filePath));
var sBuilder =new StringBuilder();foreach(byte b in computedHash){
sBuilder.Append(b.ToString("x2").ToLower());}return sBuilder.ToString();}
Stanza is a book reader for the iPhone/iPad. One of Stanza’s features is the ability to browse specially formatted book catalogs. While it has a number of built-in catalogs, you can also add your own. I have created such a catalog with ASP.Net MVC 2.0 (screenshots). The Stanza catalog format is pretty simple – just AtomPub with some proprietary attributes for images and things like search. This was a quick and easy project because the .Net Framework 4.0 has the System.ServiceModel.Syndication namespace which does all the RSS/Atom feed generation. We just have to add some custom attributes and serialize the feed to the browser.
This is the default controller specified in global.asax. It defers to MisesFeeds to generate the feed items and to FeedResult to serialize and write out the feed.
Sample Method:
public FeedResult Journal(int journalId){
var feeds =new MisesFeeds(Request);
SyndicationFeed feed = feeds.GetJournalFeed(journalId);returnnew FeedResult(new Atom10FeedFormatter(feed));}
MisesFeed contains all the code to generate a SyndicationFeed object containing a List of SyndicationItem. Note the Stanza-specific links added in search list-builder and the final helper method:
Suppose that you have a DTO (data transfer object) that you want to convert into a parameter array to be saved to file or sent over the web. You could serialize it and convert it to XML or JSON. But maybe you want to send it in an HTTP POST or GET and you don’t want to know anything about the class itself. You could use Reflection to iterate through the properties and extract the property names and values and output them to a string.
For example, this code will convert a class into a string suitable for a REST API call:
var properties = prefs.GetType().GetProperties(BindingFlags.Public| BindingFlags.Instance);
properties.ToList().ForEach(property =>{
var hasDataMemberAttribute = property.GetCustomAttributes(typeof(DataMemberAttribute), false);if(hasDataMemberAttribute.Length==1){string name = property.Name.ToLower();string value =String.Empty;object objValue = property.GetValue(prefs, null);if(null!= objValue)
value = objValue.ToString();// Only serialize properties marked with the [DataMember] attribute:
var hasBrokerMapAttribute = property.GetCustomAttributes(typeof(DataMemberBrokerMapAttribute),
false);if(hasBrokerMapAttribute.Length==1){
name =((DataMemberBrokerMapAttribute)hasBrokerMapAttribute[0]).Key;}if(value.Length>0){
filter.Append(String.Concat("/", name, "=", value));}}});
Debug.WriteLine("Search Filter:"+ filter);return filter.ToString();
If you use Response.Redirect to direct users to a new location, you should be aware that it issues a status code of 302, which means that “the resource resides temporarily under a different URI.” If you intend to communicate that the resource has permanently changed locations, you should not use Response.Redirect. This is important for search engines and other crawlers that might need to know the definitive url.
To send a 301 redirect:
Response.Status="301 Moved Permanently";
Response.StatusCode=301;
Response.AddHeader("Location", url);
Response.End();
Here is an interesting tutorial for developing .Net apps in OS X using the Eclipse IDE. The XCode equivalent is CSharpPlugin. If a native IDE isn’t important to you, running Visual Studio via VMware works just fine too.
I haven’t tried MonoMate yet, but I’ve been playing with Monobjc (used by MonoMate), which allows me to write and compile code in Visual Studio 2008, and then build native apps in OSX.
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