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.NET Tip: Type Casting and Comparison Using "as" and "is" California

Use some of the language's lesser known features for safe type casting and comparison.

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.NET Tip: Type Casting and Comparison Using "as" and "is"

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Originally published at Internet.com

You are probably used to using C-style casts. Look at an example starting with C-style casts and see how using "as" and "is" can help your code. A common situation I run into is working with controls in an ASP.NET DataGrid. Suppose I need to work with the DataGridItem that is the parent of one of the controls in the grid. Using C-style type casting, I would do something like this: // C-style try { DataGridItem item = (DataGridItem)mycontrol.Parent; if (item.GetType().ToString() == "DataGridItem") { // Do something interesting here } } catch (InvalidCastException ex) { }

Although this method works, there is a much cleaner way. First, I'll address the type cast and exception handling using "as". With "as", there is no need to check for exceptions Because it will either return the object as the requested type or it will return null. You then can check the value against null to see whether the type conversion was successful. // Using As DataGridItem item = mycontrol.Parent as DataGridItem; if (item != null) { // Do something interesting here }

This code is much more concise and explicit than when using C-style type casting. Adding the use of "is" in the comparison makes this code more readable and is slightly more efficient than the comparison to null. The end result looks like this: // Using As and Is DataGridItem item = mycontrol.Parent as DataGridItem; if (item is DataGridItem) { // Do something interesting here }

Compare this with the original version using C-style type casting. I think that you will agree the version using "as" and "is" is easier to understand and maintain because there is no need to worry about invalid cast exceptions.

About the Author

Jay Miller is a Software Engineer with Electronic Tracking Systems, a company dedicated to robbery prevention, apprehension, and recovery based in Carrollton, Texas. Jay has been working with .NET since the release of the first beta and is co-author of Learn Microsoft Visual Basic.Net In a Weekend. Jay can be reached via email at jmiller@sm-ets.com.

Author: Jay Miller

Read article at Internet.com site

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- .NET Tip: Type Casting and Comparison Using "as" and "is" San Pablo CA
- .NET Tip: Type Casting and Comparison Using "as" and "is" San Pedro CA
- .NET Tip: Type Casting and Comparison Using "as" and "is" San Rafael CA
- .NET Tip: Type Casting and Comparison Using "as" and "is" San Ramon CA
- .NET Tip: Type Casting and Comparison Using "as" and "is" San Ysidro CA
- .NET Tip: Type Casting and Comparison Using "as" and "is" Sanger CA
- .NET Tip: Type Casting and Comparison Using "as" and "is" Santa Ana CA
- .NET Tip: Type Casting and Comparison Using "as" and "is" Santa Barbara CA
- .NET Tip: Type Casting and Comparison Using "as" and "is" Santa Clara CA
- .NET Tip: Type Casting and Comparison Using "as" and "is" Santa Clarita CA
- .NET Tip: Type Casting and Comparison Using "as" and "is" Santa Cruz CA
- .NET Tip: Type Casting and Comparison Using "as" and "is" Santa Fe Springs CA
- .NET Tip: Type Casting and Comparison Using "as" and "is" Santa Maria CA
- .NET Tip: Type Casting and Comparison Using "as" and "is" Santa Monica CA
- .NET Tip: Type Casting and Comparison Using "as" and "is" Santa Paula CA
- .NET Tip: Type Casting and Comparison Using "as" and "is" Santa Rosa CA
- .NET Tip: Type Casting and Comparison Using "as" and "is" Santee CA
- .NET Tip: Type Casting and Comparison Using "as" and "is" Saratoga CA
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