DataSources (and DataConnections) Collections in VS .NET

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The main data source is included in the DataSources collection as the empty string (StringEmpty) Likewise, a main data connection is also included in the DataConnections collection This is important to remember if you re iterating through these collections or using the Count property Subjacent to the secondary data source lines of code are the lines for getting the corresponding data connection (See where we get the WebServiceConnection object within the RequestType_Changed method) The easiest way to get the connection is to get it from the DataSource object that we used to create the XPathNavigator Remember that every secondary data source, by de nition, must have an associated query data connection, so the QueryConnection property should always be available Alternatively, a reference to the Web service connection could be attained through the DataConnections collection This happens in the same fashion in which the secondary data source was found in the DataSources collection Getting a data connection from the collection returns a DataSource object that exposes only two useful items: the Name property and the Execute method Since we know it s a Web service connection and we need to access some Web service speci c properties and methods, we need to cast the generic DataSource to a WebServiceConnection The InfoPath OM de nes a speci c data connection object for each connection type, as shown in Table 155 Some commonly used properties and methods are also listed in this table
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Passing null for an XPathNavigator parameter in an Execute override method tells InfoPath to use the default XPathNavigator that it would have used without the override
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Table 155: Types of Data Connections and Their Commonly Used Properties and Methods Connection Type AdoQueryConnection AdoSubmitConnection Commonly Used OM Command Connection Timeout AttachmentFileName Introduction Subject Execute(XPathNavigator input) FileLocation Filename FolderUrl Comments Command can change the SQL query statement; Connection modifies the connection string
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The Execute override method accepts any data source, including main or secondary, to attach to the mail message
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Receive data from XML document Submit data to a SharePoint document library Sets the name of the file and folder location when using SharePoint DAV submit The Execute override method returns the queried data to the output XPathNavigator provided by form code The Execute override method allows form code to specify optional XPathNavigator objects for providing input when sending data, getting output when receiving, or retrieving SOAP fault error output The Execute override behaves similarly for both query and submit connections
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SiteUrl Execute(XPathNavigator output) ServiceUrl SoapAction Timeout Execute(XPathNavigator input, XPathNavigator output, XPathNavigator errors)
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Now that we ve set the requestType query parameter and have the Web service connection object, it s almost time to perform the query However, we have noticed that the server hosting the Web service can sometimes get bogged down from many requests Sometimes the server can take some time to respond InfoPath s default 30-second timeout on data connections may not be enough time Once the timeout is changed, it will be persisted for the life of that connection So we could have increased the timeout in the Loading event instead of immediately before querying the connection Listing 1534 shows how to set the Timeout property
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Listing 1534: Setting the Web Service Connection Timeout Property
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// Web service timeout is 30s, increase it to 60 for slow connections getSubAreasWSCTimeout = 60;
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The Web service server has turned out to be quite the unreliable machine Even with the extended timeout, we see occasional spurious errors when performing queries InfoPath handles a data connection error by showing a dialog with server details that may not make sense to the user To make the error case a little less confusing for our users, we want to detect errors when querying the Web service and handle the errors in our form code We use a try-catch block around the Web service connection s Execute override method (see Table 155) because an exception is thrown when an error occurs You could put any error-handling logic in the catch block; however, we ve decided to just check the resulting errors navigator that will be nonempty when an error happens on the server Listing 1535 shows the code
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