Figure 1341 Showing the Top Level of an Object Hierarchy in a Data Grid in .NET framework

Generation QR Code JIS X 0510 in .NET framework Figure 1341 Showing the Top Level of an Object Hierarchy in a Data Grid
Figure 1341 Showing the Top Level of an Object Hierarchy in a Data Grid
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The data grid shows each public property from the object at each level, along with links to subobjects exposed as collection properties Figure 1342 shows the second-level collection after the link has been followed
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Figure 1342 Showing the Second Level of an Object Hierarchy in a Data Grid
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The data grid is pretty flexible, but each level of hierarchy needs to be a type that exposes one or more public properties It needs property names for column names This means that, unlike the list controls, a data grid won't use a type converter or the ToString method to show the value of the object as a whole A more full-featured integration with the data grid including enabling the data grid UI to edit the data and the ability to keep the data grid up-to-date as the list data source is modified requires an implementation of the IBindingList interface, something that is beyond the scope of this book [ Team LiB ]
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Where Are We
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Data binding is the act of connecting a control to a data source Binding lets you create an association between controls and data sources to keep a control and a data source in sync automatically The control can be simple, like a TextBox or a ListBox, or full-featured, like the DataGrid If the data source is an item data source, either it's an object having zero, one, or more public properties or you need a conversion to the data type to properly bind to what the control needs A data source can also be a list data source, in which case it's a list of objects that can be shown one at a time (when simply bound) or all at once (when complexly bound) Simple binding requires no support from the control itself and allows any number of control properties to be bound to any number of data sources Complex binding requires support from the control but allows the control greater flexibility in the way it interacts with the data source For example, it can show multiple items from a list or show multiple columns from a table (or multiple properties from an object) [ Team LiB ]
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14 Multithreaded User Interfaces
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Winforms applications often need to start long-running operations, such as an intensive calculation or a call to a Web service In those cases, it's important to run the operation so that you allow the application to continue to interact with the user without freezing, while still allowing the user to see the progress of the operation and even to cancel it Before we get started, I should mention that this chapter discusses the issues surrounding multithreaded user interfaces only This simplifies the discussion and covers the information you'll need most of the time when handling long-running operations in a WinForms application For more details of threading specifics in NET including the details of the Thread class, thread pooling, locking, synchronization, race conditions, and deadlocks you should turn to your favorite low-level NET book [ Team LiB ]
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Imagine that the value of pi in SystemMathPI, at only 20 digits, just isn't accurate enough for you In that case, you may find yourself writing an application like the one in Figure 141 to calculate pi to an arbitrary number of digits
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Figure 141 Digits of Pi Application
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This program takes as input the number of digits of pi to calculate and, when the Calc button is pressed, shows the progress as the calculation happens
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Although most applications don't need to calculate the digits of pi, many kinds of applications need to perform long-running operations, whether it's printing, making a Web service call, or calculating the interest earnings of a certain billionaire in the Pacific Northwest Users are generally content to wait for such things as long as they can see that progress is being made That's why even this simple application has a progress bar The algorithm it uses calculates pi 9 digits at a time As each new set of digits is available, the application updates the text and the progress bar For example, Figure 142 shows progress on the way to calculating 1,000 digits of pi (if 21 digits are good, then 1,000 must be better)
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