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possible, is it safer to check the key exists in the table rst, and we can use the ContainsKey() method to perform this check The method returns True if the key exists in the HashTable and False otherwise In retrieving an employee from the table (using the HashTable s Item() method), the Employee class s Value function returns a formatted string of employee data, using the ControlCharsTab format character as a separator

Figure 129 The generic class diagram of Inheritance Mappers (302)

Sub LoadText() 'In this sub, we check whether a file exists 'If it does, the file is loaded as a block 'of text into txtFileInfo Dim fileName As String Dim inStream As IOStreamReader fileName = "c:\data\TextFiletxt" If IOFileExists(fileName) Then 'Open the file inStream = New IOStreamReader(fileName) 'Read contents as a block and add to text box txtFileInfoText = inStreamReadToEnd() inStreamClose() Else MessageBoxShow(fileName & " does not exist") End If End Sub Listing 113: Reading text from a le using a StreamReader

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Fault Contract Strategies A variety of strategies exist for describing your services with fault contracts You could de ne a shared core library of contracts that are used by all your company s services Fault contracts may be speci c to a single service or application, including details speci c to that system You might decide to create a contract associated speci cally with individual problems potentially encountered by your services We suggest that each time you create WCF service projects, you consider -based approach to be your default excepa comprehensive for tion policy Careful decoration of your operations with expected exceptions will enable creation of client applications with strongly typed representations of the exceptions that may be thrown by your services Whatever strategy you adopt, ensure that you consistently follow that strategy so that clients developed against your services will have improved maintainability and usability

class AbstractPlayerMapper abstract public String TypeCode {get;} protected static String TABLENAME = "Players"; class FootballerMapper public override String TypeCode { get {return "F";} } protected new static String TABLENAME = "Footballers";

In addition to the steps of getting a le name and creating a StreamReader object, we have one other check to perform if the program is to be robust While a StreamWriter will create a new le if one does not exist to write to, a StreamReader expects the le-name passed in its constructor to be the name of an existing le, and the code will cause a crash if this is not so The File class gives us a method for checking to see if the named le exists before the StreamReader is constructed If the Exists() method of the File class (all of the methods of this class are Shared, so we do not need to create an object) returns True, we can go on and create the stream If not, a suitable error message can be displayed The ReadToEnd() method of the StreamReader class will return the entire contents of the le, which can be passed directly to the Text property of the TextBox Again, the stream is closed immediately to place the le into a safe state

Unlike the other inheritance examples, this one doesn't have a overridden table name because we have to have the table name for this class even when the instance is an instance of the subclass Loading an Object

All operations that deal with bringing data into a program from some device or writing data to a device are likely to cause problems When a program tries to read from a device, the device name could be wrong, the device might not exist, or might be switched off, or the information on the device might be in a different format from what is expected; all situations that will cause the read operation to fail Similarly, an attempt to write data to a device can fail because the device is missing, or cannot be written to, or has failed in some other way Compared to moving information around inside a program, moving data to or from a storage device is fraught with danger When writing code to interact with some storage device, it is necessary to be aware of the potential pitfalls, and optimally, to deal with them when they arise Fortunately, the NET framework gives us a catch-all way of dealing with such problems; exceptions, described in- 5, are tailor-made for coping with the types of run-time error that can occur while trying to move data to or from les

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