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// get an IList and copy the data CopyData(dt, GetIList(source), columns); } The first thing this method does is get a list of column names (typically, the public properties and fields) from the data source It does this by calling a GetColumns() method (which will be covered later) Next, the target DataTable is checked to ensure that it has a column corresponding to every column name retrieved from GetColumns() If any columns are missing, they are added to the DataTable: foreach (string column in columns) if (!dtColumnsContains(column)) dtColumnsAdd(column); This ensures that all properties or fields from the data source have a column in the DataTable so they can be copied.

// create the definition description var ddesc = document.createElement("dd"); var ddesc_text = document.createTextNode(definition); ddesc.appendChild(ddesc_text); // add them to the definition list dlist.appendChild(dtitle); dlist.appendChild(ddesc); } if (dlist.childNodes.length < 1) return false; Again, this runs counter to the principles of structured programming because there is now an additional exit point in the middle of the function. But this is probably the simplest way of dealing with Internet Explorer s quirk without altering the existing function significantly. The finished function looks like this: function displayAbbreviations() { if (!document.getElementsByTagName || !document.createElement || !document.createTextNode) return false; // get all the abbreviations var abbreviations = document.getElementsByTagName("abbr"); if (abbreviations.length < 1) return false; var defs = new Array(); // loop through the abbreviations for (var i=0; i<abbreviations.length; i++) { var current_abbr = abbreviations[i]; if (current_abbr.childNodes.length < 1) continue; var definition = current_abbr.getAttribute("title"); var key = current_abbr.lastChild.nodeValue; defs[key] = definition; } // create the definition list var dlist = document.createElement("dl"); // loop through the definitions for (key in defs) { var definition = defs[key]; // create the definition title var dtitle = document.createElement("dt"); var dtitle_text = document.createTextNode(key); dtitle.appendChild(dtitle_text); // create the definition description var ddesc = document.createElement("dd"); var ddesc_text = document.createTextNode(definition); ddesc.appendChild(ddesc_text); // add them to the definition list dlist.appendChild(dtitle); dlist.appendChild(ddesc); } if (dlist.childNodes.length < 1) return false; // create a headline var header = document.createElement("h2"); var header_text = document.createTextNode("Abbreviations"); header.appendChild(header_text); // add the headline to the body document.body.appendChild(header);

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SqlCommand.Begin/EndExecuteReader SqlCommand.Begin/EndExecuteXmlReader SqlCommand.Begin/EndExecuteNonQuery

With that done, all that remains is to initiate the copy of data from the source object to the DataTable: CopyData(dt, GetIList(source), columns); Unfortunately, this is complicated slightly by the fact that the source object could be one of several object types The GetIList() method sorts that out and ensures that it is an IList that is passed to the CopyData() method GetIList() looks like this: private IList GetIList(object source) { if (source is IListSource) return ((IListSource)source)GetList(); else if (source is IList) return source as IList; else { // this is a regular object - create a list ArrayList col = new ArrayList(); colAdd(source); return col; } } If the source object implements the IListSource interface, then its GetList() method is used to retrieve the underlying IList This is typically the case with a DataTable, for instance.

If the source object directly implements IList, then it is simply cast and returned Otherwise, the source object is assumed to be a simple type (such as string), a struct, or an object In order to return an IList in this case, an ArrayList is created, the source object is added to the ArrayList, and it is returned as the result Since ArrayList implements IList, the end result is that an IList is returned..

Execute an SqlCommand asynchronously. Execute a read of XML asynchronously. Execute a nonreading SqlCommand asynchronously.

This is the same technique used by the BindingSource object in Windows Forms data binding when a simple type or object is provided as a data source for data binding.

Sometimes you may need to write a few primitives to map .NET asynchronous operations into the F# asynchronous framework. We give some examples later in this section and in 14.

// add the definition list to the body document.body.appendChild(dlist); } The two new lines will ensure that there will be no errors even if the abbr element isn t understood. They act as safety checks, much like the object detection at the start of the script.

The Fill() method calls a GetColumns() method to retrieve a list of the column names from the source object. If the source object is an ADO.NET DataView, it really will return a list of column

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