Submitting Forms in Visual Studio .NET

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it s the only way to send all of the form data as XML data Also, it s very easy to handle this in the Web service logic Simply use the InnerXml property of the XmlNode that receives the entire form The InnerXml property is precisely the entire form you want as it strips off the arbitrary top-level wrapper The entire document, when sent as a parameter to a Web service, looks like the following XML data:
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<dfs:IPDocument xmlns:dfs=" "> < Processing-instruction1 > < Processing-instruction2 > <my:myFields> </my:myFields> </dfs:IPDocument>
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A sample Web service that will save the InfoPath form data to a temporary le (with a tmp extension) is shown in Listing 81 This code assumes that the entire form is submitted to the Web service since it is stripping off the top-level wrapper node Figure 825 shows the parameters mapping dialog con gured to use this code (Notice that the parameter is formNode, which matches the SaveEntireForm parameter name)
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Listing 81: Web Service Code to Save the Entire Form
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[WebMethod] public void SaveEntireForm(SystemXmlXmlNode formNode) { string tempFile = SystemIOPathGetTempFileName(); using (SystemIOStreamWriter writer = new SystemIOStreamWriter(tempFile)) { if (formNode != null) writerWrite(formNodeInnerXml); } }
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Submitting Digitally Signed Form Data With security and privacy being top technological issues of this day and age, it is no surprise that many companies won t settle for anything less In 11, we ll talk about the details of setting up form security and deploying secure forms For now, let s assume our form is set up properly so users can digitally sign some or all of the form data Without the need
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to discuss details, we can brie y explain how you can properly submit digitally signed data Sending digitally signed form data to an external data source such as a Web service isn t as easy as simply sending the data you want As we ll nd out in 11, there are two data source speci c characteristics associated with signed form data In addition to sending the speci c data source elds and groups to an external data source, the following must also be included: 1 The associated XML signature 2 Preserved XML content, including white space If either of these two requirements is disrespected, InfoPath will detect the form as tampered because the digital signature hash of the form won t match the data Even white-space characters (eg, tab, newline) are nodes in XML! As a result, it s critical to maintain data integrity when transmitting the form data However, a slight problem may exist when sending XML data: the sending or receiving entities (InfoPath, the Web service code, or any other software in between) may decide to reformat the XML for ef ciency or even laziness in their serialization implementations Serialization is a process in which data is packaged into a convenient transferable format As you can see, and without going into too many more details, we cannot ultimately rely on sending the XML data as is In a moment, we ll learn how to remedy this problem The most common scenario for sending digitally signed data is to submit the entire form (which may be completely signed or just partially signed, it doesn t matter) But as we saw a moment ago, we cannot just send the XML form data The way to send XML data to a Web service without worrying about any data being changed is to send it as a string This form of serialization happens within InfoPath, but it s a lossless serialization that s guaranteed to not change the shape of the original data source And since we re transferring a string literal from InfoPath to the Web service, we can rest assured that the string s exact value is preserved What do we need to do in the Web service code to support this It s quite simple Now that we re submitting a string instead of XML, we can change the XmlNode parameter to string
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