UpdateDataBinding Method in VS .NET

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Listing 89 UpdateDataBinding Method
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private void UpdateDataBinding() { if (m_Initializing) return; if (m_DataSource == null || m_RowIdMember == null) return; IList list = ListBindingHelperGetList(m_DataSource, m_DataMember) as IList; if (list == null || listCount < 0) return; // Get the property descriptors for the items PropertyDescriptorCollection objProps = TypeDescriptorGetProperties(list[0]); // Loop through the items, extracting the row identifier member // and binding each of the other numeric columns as ChartPairs int vertPos = 0; for (int index = 0; index < listCount; index++) { object obj = list[index]; // Locate the row identifier property in the object PropertyDescriptor propDesc = objPropsFind(m_RowIdMember, true); if (propDesc == null) { continue; // Not a valid row } // Code to add a label based on the row identifier omitted AddBarChartControl(index, 150, vertPos,obj,objProps); vertPos += 150; } }
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This method first checks to see if the control is initializing; if so, it does nothing If it isn't initializing, the method checks to make sure that, at a minimum, there is a data source and row identifier to work with Then it calls the GetList method on the ListBindingHelper class This method does a lot of complex work for you, based on the various data-binding interfaces discussed in 7 Basically what it does is to first check the data source to see if it implements the IListSource interface If so, it uses the GetList method on that interface to get back a list It then checks the data member and tries to resolve that data member on the data source and return that as a list It goes through a few other gyrations, handling different combinations of lists of lists, data member vs no data member, and so on, but basically it takes care of trying to find a valid IList collection from the provided data source and data member If it fails to find a valid collection to work with, the data-binding method gives up and returns null Once the list has been determined from the data source and member, the code reaches into the list, again using property descriptors, and locates the field or property containing the row identifier label and gets its value The method then creates an instance of a Label control, sets appropriate properties on that control, and adds it to theControls collection of your custom control to render the row identifier label The code for this is omitted because it is just rudimentary Windows Forms control initialization code like that the designer generates every time you drag and drop a Label control onto a form and set itsText property Next the loop calls theAddBarChartControl method
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The AddBarChartControl method gets the property descriptors for all of the columns or properties in the corresponding data item, determines if the field is a numeric type based on the property descriptor's PropertyType property, and then extracts the field name and value and adds a corresponding ChartPair to the Data property of the bar chart This method is shown inListing 810
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Listing 810 AddBarChartControl Method
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private void AddBarChartControl(int index, int xpos, int ypos, object dataItem, PropertyDescriptorCollection objProps) { BarChartControl bar = new BarChartControl(); m_BarIndexesAdd(bar, index); barLocation = new Point(xpos, ypos); barSize = new Size(ClientSizeWidth-250, 150); ControlsAdd(bar); barDataClear(); foreach (PropertyDescriptor propDesc in objProps) { Type propType = propDescPropertyType; string propName = propDescDisplayName; if (propName == m_RowIdMember) continue; double propVal; if (propType == typeof(int) || propType == typeof(short) || propType == typeof(float) || propType == typeof(double) || propType == typeof(long)) { object val = propDescGetValue(dataItem); propVal = ConvertToDouble(val);
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} else if (propType == typeof(string)) { bool converted = doubleTryParse((string)propDescGetValue(dataItem), out propVal); if (!converted) continue; } else { continue; } barDataAdd(new ChartPair(propName, propVal)); } }
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The AddBarChartControl method creates an instance of a BarChartControl, initializes it size and location, and adds it to the Controls collection of the container user control It then loops through each of the properties on the data item that was passed in, and if it is a numeric type, or is a string that can be converted to a numeric type, then a corresponding ChartPair is added to the Data collection of the bar chart control Notice the use of the new tryParse method on the double class Each primitive class in NET has aParse method that has been there since version 10 of the Framework The problem with the Parse method is that it will throw an exception if it fails to convert the string passed inand throwing an exception is a very expensive operation and can seriously hinder your performance if it is done frequently As a result, in version 20 of the Framework, each of the primitive types has had a TRyParse method added, which lets you try to parse a string value into a value of the primitive type without throwing an exception If the parsing succeeds, it returns a Boolean value of TRue, and you can use the value you passed in as the second (out) parameter to the method If the return value is false, parsing was unsuccessful and should ignore the value that you passed in As you can see, there isn't a ton of code involved to handle the data binding yourself for basic iteration through a data source and presenting the data without a binding source, but there are a lot of things that aren't handled in the code so far, such as support for sorting, filtering, editing, adding new rows, and so on, which the binding source handles for you The ListBindingHelperGetList method handles the initial probing and discovery aspects of locating an appropriate list in a data source To handle all those other things requires working with a number of other interface types You will usually want to harness the support of the binding source for these
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