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The following example demonstrates how to invoke a method via the MethodInfo class:
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As you can see, this method returns true or false indicating whether the specified string can be parsed into an Int32 . If the method returns true, the variable passed by reference to the result parameter will contain the parsed numeric value . The TryXxx pattern is discussed in 20, "Exceptions and State Management ."
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MethodBase Member IsAbstract IsAssembly IsConstructor IsPrivate IsPublic IsStatic IsVirtual
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The following section shows the interactions between an active client and a Web service that is con gured to trust tokens generated by an ADFS issuer. Figure 12 shows a detailed message sequence diagram.
Query Tuning
Figure 12-7: FxCop analysis tool. FxCop is available as a stand-alone tool or integrated into Visual Studio. Testers can use the standalone tool to examine a managed binary for errors, but most testers and developers use the integrated version of the tool for analysis. Note The Code Analysis Team Blog at contains a wealth of information on analysis tools in Visual Studio Team System. Code Analysis Overload The most difficult challenge in using code analysis tools is getting started. In a brand new project where code analysis tools are used in the early stages, the "extra" work to detect and fix code errors is barely noticeable. However, when starting to use analysis tools in established products, the initial overload of potential errors can scare a team into turning off the tool. A few years ago, I was in charge of supporting, maintaining, and implementing static analysis tools across a large code base. My initial reports indicated that there were thousands of errors that needed to be investigated before our next release. Although everyone knew that the errors were coming, in a team of about 100 developers, I knew I would take some heat if I gave everyone 10 to 20 new bugs to investigate. So, I explained to everyone that I was going to start logging bugs for errors found by our static analysis tools in our legacy code. I went on to explain that, initially, I would log bugs only for the most critical errors (potential crashes and security issues), but over time I would be adding additional rules and checks. I logged a small number of bugs initially, and a few more every week after that while I added a more strict set of rules. Sometimes there was some grumbling, but within a few months, we had fixed thousands of analysis errors including many beyond what were used in my initial report. This is a classic application of the Boiled Frog parable [7]: people don't notice gradual changes as much as drastic changes. Over time, the team more than caught up on their backlog of code analysis bugs, but an even more impressive feat is that many members of the team frequently approached me and asked me to turn on more code analysis rules.
.method public static int32 modopt([mscorlib]System.Runtime.CompilerServices.CallConvCdecl) main() cil managed { .vtentry 1 : 1 // Code size 28 (0x1c) .maxstack 1 IL_0000: ldsflda valuetype $ArrayType$0x0faed885 A0x44d29f64.unnamed global 0 IL_0005: call vararg int32 modopt([mscorlib]System.Runtime.CompilerServices.CallConvCdecl) printf(int8 modopt([Microsoft.VisualC]Microsoft.VisualC.NoSignSpecifiedModifier) modopt([Microsoft.VisualC]Microsoft.VisualC.IsConstModifier)*) IL_000a: pop IL_000b: ldsflda valuetype $ArrayType$0x0e6cb2b2 A0x44d29f64.unnamed global 1 IL_0010: newobj instance void [mscorlib]System.String::.ctor(int8*) IL_0015: call void [mscorlib]System.Console::WriteLine(string) IL_001a: ldc.i4.0 IL_001b: ret } // end of method Global Functions ::main
ANSI SQL:1992 introduced support for outer joins, and this drove the need for a separation of filtersthe ON filter and the WHERE filter. I'll explain this in detail in the outer joins section. Part of the confusion surrounding the two syntaxes has to do with the fact that T-SQL supported a proprietary syntax for outer joins before SQL Server added support for the ANSI SQL:1992 syntax. There was a practical need for outer joins, and SQL Server provided an answer to that need.
Compiling and Testing the Control
DECLARE @p2 AS NCHAR(4000); DECLARE @currchar AS CHAR(1), @nextchar AS CHAR(1); DECLARE @p2len AS INT; SET @maxlength = LEN(RTRIM(SUBSTRING(@p1,1,4000))); SET @maxlength = CASE WHEN @maxlength > @parselength THEN @parselength ELSE @maxlength END; SET @pos = 1; SET @p2 = ''; SET @p2len = 0; SET @currchar = ''; set @nextchar = ''; SET @mode = 'command'; WHILE (@pos <= @maxlength) BEGIN SET @currchar = SUBSTRING(@p1,@pos,1); SET @nextchar = SUBSTRING(@p1,@pos+1,1); IF @mode = 'command' BEGIN SET @p2 = LEFT(@p2,@p2len) + @currchar; SET @p2len = @p2len + 1 ; IF @currchar IN (',','(',' ','=','<','>','!') AND @nextchar BETWEEN '0' AND '9' BEGIN SET @mode = 'number'; SET @p2 = LEFT(@p2,@p2len) + '#'; SET @p2len = @p2len + 1; END IF @currchar = '''' BEGIN SET @mode = 'literal'; SET @p2 = LEFT(@p2,@p2len) + '#'''; SET @p2len = @p2len + 2; END END ELSE IF @mode = 'number' AND @nextchar IN (',',')',' ','=','<','>','!') SET @mode= 'command'; ELSE IF @mode = 'literal' AND @currchar = '''' SET @mode= 'command'; SET @pos = @pos + 1; END RETURN @p2; END GO
Extensions for C++ code for an assembly. Anakrino was written by Jay Freeman and is downloadable from Unlike .NET Reflector, Anakrino has source code available. Although Anakrino isn't perfect, it's a fantastic way to learn about how the .NET Framework code all fits together. Using Anakrino is self-explanatory, so I won't bother to go into it. One caveat I will mention is that the source code is quite "original" with a huge amount of template usage, so you'll need to make a serious commitment if you want to extend it. A few commercial decompilers that produce better output have been released at the time of this writing, but they're prohibitively expensive, so Anakrino's foibles are perfectly acceptable. Summary Although managed code is terrific because we no longer have to mess with memory corruptions and leaks, we still have to know how to use the debugging features. In this chapter, I concentrated on the unique issues associated with Visual Studio .NET and debugging managed applications. I started by discussing the issues particular to advanced breakpoints. It's absolutely wonderful that Visual Studio .NET can call methods and properties from conditional breakpoints, but it means you must be extra careful to avoid causing side effects in your breakpoints. Also remember that if you mess up the condition, the debugger won't stop if it can't properly evaluate the condition. The exciting Watch window offers all sorts of extra power for managed applications. With its full expression evaluator, you can easily call methods and properties so that you can influence debugging behavior to help your testing efforts. Additionally, for C# and Managed Extensions for C++ applications, you can add your custom types to the autoexpand rules to make debugging even faster. Finally, although you might never program in MSIL, it's simple to learn and can help you truly see what the .NET Framework class library is doing behind the scenes. If you'd like more information about MSIL, make sure to check out Partition III CIL.DOC, which you can find in <Visual Studio .NET installation directory>\SDK\v1.1\Tools Developers Guide\docs. In that information, you'll find the lowdown on every instruction and what each does.
The plan scans an index on the Employees table for the EmployeeID values. Each EmployeeID value drives a single seek within the covering index on Orders to return the requested most recent 3 orders for that employee. The interesting part here is that you don't get only the keys of the rows found; rather, this plan allows for returning multiple attributes. So there's no need for any additional activities to return the non-key attributes. The I/O cost of this query is only 18 logical reads. Surprisingly, there's a solution that can be even faster than the one using the APPLY operator in certain circumstances that I'll describe shortly. The solution uses the ROW_NUMBER function. You calculate the row number of each order, partitioned by EmployeeID, and based on OrderDate DESC, OrderID DESC order. Then, in an outer query, you filter only results with a row number less than or equal to 3. The optimal index for this solution is similar to the covering index created earlier, but with the OrderDate and OrderID columns defined in descending order: CREATE UNIQUE INDEX idx_eid_odD_oidD_i_cid_rd ON dbo.Orders(EmployeeID, OrderDate DESC, OrderID DESC) INCLUDE(CustomerID, RequiredDate);
To enable and configure local file logging for Windows Server 2003 IAS
Then, on your development computer, follow these steps:
Binary composite controls and User controls are similar, so there seems to be some redundancy in the framework . Because User controls have such an affinity for the Designer, perhaps it seems you don t need custom composite controls at all . However, each style of composite control has distinct advantages and disadvantages . The major advantage of binary composite controls is that they are deployed as individual assemblies . Because binary composite controls are packaged in distinct assemblies, you can sign them and deploy them across the enterprise . You also can install them in the global assembly cache . Signing and deploying global assemblies is an advanced topic but I mention it here because this is one of the main reasons to choose a binary control over a User control . The primary downside to using binary composite controls is that they require you to pay more attention to detail in the coding process (there s no Designer support as you write them because they are created entirely from code) . The primary advantage of User controls is that they do include Designer support, which makes them very easy to design visually . However, User controls have a downside in their deployment: They go with the project in which they were created, and they are deployed that way . You can include them as part of other projects, but that requires copying the .ascx and the .cs files to the new project . They are not deployed as signed, secure assemblies .
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