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Another set of changes results from replacing the local variable loading/storing instructions ldloc Retval and stloc Retval with the instructions ldloc.0 and stloc.0, respectively. IL defines special operation codes for loading/storing the first four local variables on the list, numbered 0 to 3. This is advantageous because the canonic form of the instruction (ldloc Retval) compiles into the operation code (ldloc) followed by an unsigned integer indexing the local variable (in this case 0), and the instructions ldloc.n compile into single-byte operation codes without parameters. You might also notice that all branching instructions (br, brfalse, and brtrue) in the method check are replaced with the short forms of these instructions (br.s, brfalse.s, and brtrue.s). A standard (long) form of an instruction compiles into an operation code followed by a 4-byte parameter (in the case of branching instructions, offset from the current position), whereas a short form compiles into an operation code followed by a 1-byte parameter. This limits the range of branching to a maxima of 128 bytes backward and 127 bytes forward from the current point in the IL stream, but in this case you can safely afford to switch to short forms because the method is rather small. Short forms that take an integer or unsigned integer parameter are defined for all types of IL instructions. So even if you declare more than four local variables, you still could save a few bytes by using the instructions ldloc.s and stloc.s instead of ldloc and stloc, as long as the index of a local variable does not exceed 255. The high-level language compilers, emitting the IL code, automatically estimate the ranges and choose whether a long form or a short form of the instruction should be used in each particular case. The ILAsm compiler, of course, does nothing of the sort. If you specify a long or short instruction, the compiler takes it at face value you are the boss, and you are supposed to know better. But if you specify a short branching instruction and place the target label out of range, the ILAsm compiler will diagnose an error. Once, a colleague of mine came to me complaining that the IL assembler obviously could not compile the code the ILDASM produced. The disassembler and the assembler are supposed to work in absolute concert, so I was quite startled by this discovery. A short investigation uncovered the grim truth. In an effort to work out a special method for automatic test program generation, my colleague was compiling the initial programs written in Visual C# and Visual Basic .NET, disassembling the resulting executables, inserting test-specific ILAsm segments, and reassembling the modified code into new executables. The methods in the initial executables, produced by Visual C# and Visual Basic .NET compilers, were rather small, so the compilers were emitting the short branching instructions, which, of course, were shown in the disassembly as is. And every time my colleague s automatic utility inserted enough additional ILAsm code between a short branching instruction and its destination, the branching instruction, figuratively speaking, kissed its target label good-bye. One more change to note in the sample: the instruction ldc.i4 1 was replaced with ldc.i4.1. The logic here is the same as in the case of replacing ldloc Retval with ldloc.0 in other words, a shortcut operation code to get rid of a 4-byte integer parameter. The shortcuts ldc.i4.n exist for n from 0 to 8, and ( 1) can be loaded using the operation code ldc.i4.m1. The short form of the ldc.i4 instruction ldc.i4.s works for the integers in the byte range (from 128 to 127). Now copy the source file Simple1.il from the Apress Web site, compile it with the console command ilasm simple1 into an executable (Simple1.exe), and ensure that it runs exactly as Simple.exe does. Then disassemble both executables side by side using the console commands ildasm simple.exe /bytes and ildasm simple1.exe /bytes. (The /bytes option makes the
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Setting a Default Value
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Implementing Exists Methods
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Concerts: Find Out and Share with Friends
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CHAPTER 11 RELIABLE RESOURCE MANAGEMENT
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Here s the markup: <li id="PHGraph"> <div id="PHGraphDiv"> <table width="400px" cellspacing="0" cellpadding="0" style="border-width: 0"> <tr> <td style="background-color: #1077AD"> <span class="style2"> Price History Graph </span> </td> </tr> <tr> <td> <atlas:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> <asp:Label ID="lblPHGraph" runat="server" Text="Label"> </asp:Label> </ContentTemplate> </atlas:UpdatePanel> <atlas:UpdateProgress runat="server" ID="Prog4"> <ProgressTemplate> Loading... </ProgressTemplate> </atlas:UpdateProgress> </td> </tr> </table> </div> </li> The <li> tag denotes this section as being part of an HTML list. The drag-and-drop mechanism, which I ll discuss later in the Using Atlas Client Controls for an Enhanced UI section, uses this. The markup defines a table with a header row containing the text Price History Graph and a second row containing the graph itself. The graph is implemented using a Label control, which is contained within the content template of an UpdatePanel control. The UpdatePanel control is contained within a <td> element, putting it within a cell in the table. The name of this Label control is lblPHGraph. As you probably remember, the entire page update is triggered by the user changing the contents of the text box to select a new stock ticker. This calls the DoUpdate() function on the server. Within this function, you ll find this line of C# code: lblPHGraph.Text = "<img src='PH.aspx ticker=" + TextBox1.Text + "&days=100' />";
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CHAPTER 5 s COMPLETING THE FRAMEWORK
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CHAPTER 11 INDEXES
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9.21. Creating Customized Pivot Table Copies
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delegate bool Processor<type>( type element); class RefactoredIterator < type> { IList _list; Processor< type> _processor; public RefactoredIterator ( IList list, Processor< type> processor) { _list = list; _processor = processor; } public bool Iterate() { foreach( type element in _list) { if( !_processor( element)) { return false; } } return true; } } In this new definition, the RefactoredIterator<> constructor requires both a list to iterate and a delegate that will be called by the foreach loop. The implementation of the loop is identical to the previous example that called a virtual method. Now consider the following example that refactors the GetItem method using the new class and anonymous delegates: class DuplicatedInternal { public IList _items = new ArrayList(); public Item GetItem( int id) { Item found = null; new RefactoredIterator< Item>( _items, new Processor< Item>( delegate( Item item) { if( item.Id == id) { found = item; return false; } return true; })).Iterate(); return found ; } } In the implementation of the method GetItem, the class RefactoredIterator<> is instantiated, and then the method Iterate is called. Like the previous example, the RefactoredIterator<> instance isn t assigned to any variable. The delegate that is passed to Processor is an anonymous delegate, where the implementation of the delegate is defined in the method GetItem. In the
The syntax for the INTERVAL DAY TO SECOND type is straightforward INTERVAL DAY(n) TO SECOND(m) where N is an optional number of digits to support for the day component and varies from 0 to 9, with a default of 2. M is the number of digits to preserve in the fractional part of the seconds field and varies from 0 to 9, with a default of 6. Once again, the function I prefer to use to create instances of these INTERVAL type is NUMTODSINTERVAL ops$tkyte@ORA11GR2> select numtodsinterval( 10, "day" )+ 2 numtodsinterval( 2, "hour" )+ 3 numtodsinterval( 3, "minute" )+ 4 numtodsinterval( 2.3312, "second" ) 5 from dual; NUMTODSINTERVAL(10,"DAY")+NUMTODSINTERVAL(2,"HOUR")+NUMTODSINTERVAL(3,"MINU --------------------------------------------------------------------------+000000010 02:03:02.331200000 or simply ops$tkyte@ORA11GR2> select numtodsinterval( 10*86400+2*3600+3*60+2.3312, "second" ) 2 from dual; NUMTODSINTERVAL(10*86400+2*3600+3*60+2.3312,"SECOND") --------------------------------------------------------------------------+000000010 02:03:02.331200000 using the fact that there are 86,400 seconds in a day, 3,600 seconds in an hour, and so on. Alternatively, as before, we can use the TO_DSINTERVAL function to convert a string into a DAY TO SECOND interval ops$tkyte@ORA11GR2> select to_dsinterval( "10 02:03:02.3312" ) 2 from dual; TO_DSINTERVAL("1002:03:02.3312") --------------------------------------------------------------------------+000000010 02:03:02.331200000
CHAPTER 14 MANAGED EXCEPTION HANDLING
In the DataPortal_Fetch() method of Project, a call is made to the GetProjectResources() factory method in ProjectResources. That factory method calls a parameterized constructor, passing a data reader that contains the collection of data for the child objects to be loaded into the collection. That constructor then calls the following Fetch() method to load the object with data: private void Fetch(SafeDataReader dr) { RaiseListChangedEvents = false; while (dr.Read()) this.Add(ProjectResource.GetResource(dr)); RaiseListChangedEvents = true; } This method loops through all the items in the data reader, using each row of data to create a new ProjectResource child object. I ll discuss the GetResource() factory method later in the chapter, but you can see that it accepts the data reader object as a parameter so the new child object can populate itself with data from the current row. As discussed in 7, the RaiseListChangedEvents property is set to false and then true to suppress the ListChanged events that would otherwise be raised as each item is added.
Typing In Other Languages International Keyboards
WCF DATA SERVICES
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