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CHAPTER 4 VIEWSTATE AND SCRIPTING
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cm.CommandType = CommandType.StoredProcedure; cm.Parameters.Add( "@PageName", SqlDbType.VarChar, 400).Value = Request.Url.AbsoluteUri; cm.Parameters.Add( "@SessionID", SqlDbType.VarChar, 50).Value = vsk.Value; cm.Parameters.Add( "@StateData", SqlDbType.Image).Value = ms.ToArray(); cn.Open(); cm.ExecuteNonQuery(); cn.Close(); } protected override object LoadPageStateFromPersistenceMedium() { if (Request.Params["__VIEWSTATE_KEY"] == null) return null; string viewstatekey = Request.Params["__VIEWSTATE_KEY"].ToString(); SqlConnection cn = new SqlConnection(connStr); SqlCommand cm = new SqlCommand("usp_LoadState", cn); SqlDataReader dr = null; cm.CommandType = CommandType.StoredProcedure; cm.Parameters.Add( "@PageName", SqlDbType.VarChar, 400).Value = Request.Url.AbsoluteUri; cm.Parameters.Add( "@SessionID", SqlDbType.VarChar, 50).Value = viewstatekey; try { cn.Open(); dr = cm.ExecuteReader();
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CHAPTER 4 VIEWSTATE AND SCRIPTING
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if (dr.Read()) { LosFormatter bf = new LosFormatter(); object data = bf.Deserialize (new MemoryStream((byte[])dr[0])); return data; } else return null; } finally { if (dr != null) dr.Close(); cn.Close(); } } }
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Note Notice that you re using the LosFormatter to serialize your data into the database. This is the
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limited object serializer formatter. It s like the BinaryFormatter, but is highly optimized for strings, arrays, and hashtables.
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Realize that there are only specific circumstances where this type of solution benefits your application. The first is, obviously, a thin client pipe. If you re writing an intranet application on a 100mbps LAN, you really don t need to worry about the size of ViewState. It s just not going to make that big of a difference. Even with a thin client pipe, the extra round trip to the database must be taken into account. If you re not using a Web Farm, you can put a dedicated instance of SQL Server on the web server to act as an exclusive ViewState server. This saves you a network round trip, but still introduces a process hop. If you re binding a grid, it may be just as expensive to marshal this state data to the database and back as it would be to rebind the grid with the original data. As with all things in application architecture, the solution that makes the most sense depends on your specific requirements and circumstance. The class above will work in both 1.x and 2.0. It will be useful more often in 1.x implementations, as the introduction of ControlState in 2.0 provides a solution for many situations where ViewState was previously imperative but can now be disabled.
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Post-cache substitution is a handy feature that is designed for performance optimization. It dovetails with output caching. The functionality is exposed via a web control named Substitution, but you can think of this feature as a modification to the output caching infrastructure present in version 1.x of ASP .NET.
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CHAPTER 4 VIEWSTATE AND SCRIPTING
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Output caching allows you to take the markup generated by a page object or user control and squirrel it away in the memory of the web server. You do this very simply by adding a directive to the top of the markup file. <%@ OutputCache Duration=15 VaryByParam=None %> The Duration attribute expresses the number of seconds the output should be cached. The VaryByParam attribute allows you to make different cache entries for different requests, creating a unique entry per query string value, for example. When a page is output cached, the next time a request comes in for the page, the pregenerated markup is pulled from the cache and sent as the response to the request. This saves the time and expense of creating an instance of the page object and executing all of the code it contains, and can even save network hops to the database. Output caching is screaming fast, as the results are in memory and the Framework doesn t even have to read a file from the disk (as it would for a static HTML document). The results are returned right from memory.
Note Output caching has been a feature of the ASP.NET Framework since version 1.0. If you re not familiar with it, please see the SDK documentation on it. We don t give it full coverage in this section, as this is about the new feature of ASP.NET 2.0, post-cache substitution.
So let s suppose you have a page that is mostly static, with just a small bit of markup that needs to be dynamically generated with each request. That is, all of the markup for this page could be cached using the output caching feature, but a little remaining bit of the page needs to be dynamically generated with each incoming request. Post-cache substitution accommodates this situation by allowing you to cache the entire page, but leave a certain part left out for regeneration with each incoming request. The part of the page that shouldn t be cached is marked with a Substitution element. The content for this element is returned as a string from a static method you add to the codebehind of your page. Let s take a look at a simple example. The page shown in Figure 4-10 displays the time that the code for the page was last executed on the left and the last time it was requested on the right.
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