c# datamatrix barcode 1.x Problem: Proxies Generate Fields and Not Properties in Visual C#.NET

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1.x Problem: Proxies Generate Fields and Not Properties
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The proxy types generated to represent the state information of complex elements coming in off the wire use fields to expose this information. For example, let s take a look at the proxy type generated for the PhoneNumber class in Visual Studio .NET 2003: [System.Xml.Serialization.XmlTypeAttribute(Namespace="http://phoneNumber/")] public class PhoneNumber { /// <remarks/> public string AreaCode; /// <remarks/> public string Number; /// <remarks/> public PhoneType NumberType; }
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CHAPTER 6 SOA IN .NET: WEB SERVICES
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This class definition isn t suitable for a data binding operation. Consider the following simple code that should result in a list of numbers (see TryToBind.aspx in Web06_11): private void btn1_Click(object sender, System.EventArgs e) { Proxy.PhoneNumberLib p = new Proxy.PhoneNumberLib(); ddl.DataSource = p.PhoneNumberList(""); ddl.DataTextField = "Number"; ddl.DataBind(); } Instead of a fine drop-down list, this code produces the following travesty (see Figure 6-15).
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Figure 6-15. Exception that occurs when you try to bind to fields instead of properties This exception occurs because the data-binding engine is using reflection to find the properties named by DataTextField. It doesn t use reflection to look for fields, only properties. Your choices in this situation are to rewrite the proxy type manually, or create a different PhoneNumber type on the client that exposes this state information as properties instead of fields, and then accept an instance of the proxy type in a custom constructor and map the fields to the properties. The 2.0 proxy generator solves this problem by using properties. Adding a reference to exactly the same service using Visual Studio .NET 2005 results in the following type declared in the generated proxy: [System.SerializableAttribute()] [System.Xml.Serialization.XmlTypeAttribute(Namespace="http://phoneNumber/")] public partial class PhoneNumber {
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CHAPTER 6 SOA IN .NET: WEB SERVICES
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private string areaCodeField; private string numberField; private PhoneType numberTypeField; public string AreaCode { get { return this.areaCodeField; } set { this.areaCodeField = value; } } public string Number { get { return this.numberField; } set { this.numberField = value; } } public PhoneType NumberType { get { return this.numberTypeField; } set { this.numberTypeField = value; } } } The differences here are so subtle that you wouldn t notice them in most contexts. They do, however, appease the data-binding engine nicely.
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1.x Problem: Type Fidelity Available Only for Datasets
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Consider what you looked at earlier with the PhoneNumber and its proxy type. You established that the type on the server isn t at all the same as the type generated for the proxy. Where the type on the server had properties and behaviors, the proxy type had only fields (see Figure 6-11). Given this, how can the following service possibly work [WebMethod] public DataSet getPubsData() { string sql = "select * from authors " + "select * from titles " + "select * from publishers " + "select * from titleauthor"; SqlConnection cn = new SqlConnection(WebStatic.ConnectionString); SqlCommand cm = new SqlCommand(sql,cn); DataSet ds = new DataSet(); new SqlDataAdapter(cm).Fill(ds); ds.Relations.Add( ds.Tables[1].Columns["title_id"], ds.Tables[3].Columns["title_id"]);
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CHAPTER 6 SOA IN .NET: WEB SERVICES
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ds.Relations.Add( ds.Tables[0].Columns["au_id"], ds.Tables[3].Columns["au_id"]); ds.Relations.Add( ds.Tables[2].Columns["pub_id"], ds.Tables[1].Columns["pub_id"]); return ds; } Here s the some code consuming this method using a Web Service proxy. void Page_Load(object sender, EventArgs e) { Proxies.TypedService ts = new Proxies.TypedService(); DataSet ds = ts.getPubsData(); foreach (DataTable dt in ds.Tables) { DataGrid dg = new DataGrid(); dg.DataSource = dt; dg.DataBind(); this.FindControl("form1").Controls.Add(dg); } } What s going on here Is this .NET type fidelity for a Web Service This is accomplished with smarts that are built into the proxy generating code. This DataSet is still XML described by XML Schema on the wire. It s still interoperable. Another platform won t see this data as a DataSet, but as a complex hierarchal document described by XML Schema from the WSDL. The .NET proxy, however, has been taught to recognize this as a DataSet, and so when it comes in off the wire, the proxy creates a new instance of a real DataSet and merges this data into it from the SOAP body of the message. In version 1.x of the Framework, the DataSet was the only type that supported this functionality. In version 2.0, Microsoft has added a point of extensibility so you can modify the proxy generator and affect the code it produces. Understand that this is a modification to the design time behavior of a developer s environment and not a way to change the run-time behavior of Web Services. In cases where the assemblies contain types that are needed on both the client and server, it can be very tempting to long for the type affinity that the client and server share in an RPC environment. This isn t really even considered a Best Practice (or a good idea, depending on who you re listening to) in a service-oriented environment. It s a throwback to the tight coupling between client and server that service orientation is supposed to liberate us from. All these considerations aside, sometimes this is the behavior you need. Today, the only choice is to manually modify the generated client-side proxies. This is not a lot of fun, because you must apply whatever changes are made anew every time the service changes and the proxy needs to be regenerated. So the new feature in 2.0 extends the pipeline that s generating the client-side proxy. This pipeline extension executes when your users choose to Add a Web Reference from within the IDE, or when they run the wsdl.exe command-line tool. Typically the proxy generator is going
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