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CHAPTER 8 s DATA BINDING IN ATLAS
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#pragma managed (push, off) int f() { int i = 1; return 1 / --i; } #pragma managed (pop) int main() { __try { f(); } __except(GetExceptionCode() == EXCEPTION_INT_DIVIDE_BY_ZERO EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) { System::Console::WriteLine("Divide by zero exception"); } return 0; } This code shows the three parts of Win32 SEH: a try block, an exception filter, and an exception handler. When an exception is thrown in the try block, the exception filter is evaluated. This exception filter is an expression that is used to determine how the exception handling proceeds. If it returns EXCEPTION_EXECUTE_HANDLER, then the handler is executed. EXCEPTION_CONTINUE_SEARCH means that the exception is not handled and other filters on the call stack are checked. The IL code generated from the preceding C++/CLI code shows how main is separated into the try block, exception filter, and exception handler. .method assembly static int32 modopt([mscorlib]System.Runtime.CompilerServices.CallConvCdecl) main() cil managed { .maxstack 2 .locals (int32 filterResult) begin_: call int32 modopt([mscorlib]System.Runtime.CompilerServices.CallConvCdecl) f() pop leave return_ theFilter_: pop // GetExceptionCode() == EXCEPTION_INT_DIVIDE_BY_ZERO // EXCEPTION_EXECUTE_HANDLER :
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Your vertex shader has to construct the Tangent-to-World matrix so your pixel shader can immediately use it: BMVertexToPixel BMVertexShader(float4 inPos: POSITION0, float3 inNormal: NORMAL0, float2 inTexCoord: TEXCOORD0, float3 inTangent: TANGENT0) { BMVertexToPixel Output = (BMVertexToPixel)0; float4x4 preViewProjection = mul(xView, xProjection); float4x4 preWorldViewProjection = mul(xWorld, preViewProjection); Output.Position = mul(inPos, preWorldViewProjection); Output.TexCoord = inTexCoord; float3 Binormal = cross(inTangent,inNormal); float3x3 tangentToObject; tangentToObject[0] = normalize(Binormal); tangentToObject[1] = normalize(inTangent); tangentToObject[2] = normalize(inNormal); float3x3 tangentToWorld = mul(tangentToObject, xWorld); Output.TTW = tangentToWorld; return Output; } The vertex shader samples the bump map and maps the color into the [ 1,1] range to obtain the normal defined in tangent space. By multiplying this vector by the Tangent-toWorld matrix, the normal defined in world space is obtained, which can be dotted with the light direction: BMPixelToFrame BMPixelShader(BMVertexToPixel PSIn) : COLOR0 { BMPixelToFrame Output = (BMPixelToFrame)0; float3 bumpColor = tex2D(BumpMapSampler, PSIn.TexCoord*xTexStretch); float3 normalT = (bumpColor - 0.5f)*2.0f; float3 normalW = mul(normalT, PSIn.TTW);
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The final common interface is ICommandObject. Like IReadOnlyCollection, this is an empty interface: interface ICommandObject : IBusinessObject { } Again, you can use this interface to easily determine if a business object inherits from CommandBase within your business or UI code.
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The ReadWriteAuthorization control from the Csla.Windows namespace helps Windows Forms developers build interfaces where the controls on the form alter their appearance based on whether the user is authorized to read or write to the underlying business object property. The Authorizer control in the Csla.Wpf namespace provides similar functionality for WPF. The Authorizer control is a decorator control and is a subclass of DataDecoratorBase. If you want it to affect the appearance of multiple controls, you can nest those controls within a panel or other container control, then put that container control inside the Authorizer control. In most cases, developers will probably prefer the PropertyStatus control instead of Authorizer, because it handles not only authorization but also validation and busy status notification. However, Authorizer does provide an alternative, making it easy to implement authorization for a group of data bound controls contained within the Authorizer control. Authorizer uses the IAuthorizeReadWrite interface from the Csla.Security namespace to interact with the business object. I ll discuss this interface in more detail in 13. The control uses this interface to determine whether the user is authorized to read or write to each business object property that is data bound to a control contained within the Authorizer control.
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Decision Tree for Quickly Interpreting the Statistics
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A Parent entry set to nil means a deleted ClassLayout record. However, if the Parent entry is non-nil, the following rules apply: The Parent entry must hold a valid reference to the TypeDef table, and the referenced TypeDef record must have the Flags bit explicit or sequential set and must have the interface bit not set. [run time] The PackingSize entry must be set to 0 or to a power of 2 in the range 1 to 128. The table must contain no duplicate records with the same Parent entries.
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There s a class library that I ve been using in every example in the book so far. It is the one that contains the Console class. The Console class is defined in an assembly called mscorlib in a file called mscorlib.dll. You won t find this assembly listed in the References folder, however. Assembly mscorlib contains the definitions of the C# types and the basic types for most .NET languages. It must always be referenced when compiling a C# program, so Visual Studio doesn t bother showing it in the References folder. When you take into account mscorlib, the compilation process for MyWidgets looks more like the representation shown in Figure 10-3. After this, I ll assume the use of the mscorlib assembly without representing it again.
You invoke a delegate by calling it, as if it were simply a method. The parameters used to invoke the delegate are used to invoke each of the methods on the invocation list (unless one of the parameters is an output parameter, which we ll cover shortly). For example, the delegate delVar, as shown in the following code, takes a single integer input value. Invoking the delegate with a parameter causes it to invoke each of the members in its invocation list with the same parameter value (55, in this case). Figure 15-9 illustrates the invocation. MyDel delVar = inst.MyM1; delVar += SCl.m3; delVar += X.Act; ... delVar( 55 ); ...
Even if your choice of hardware is appropriate, your data design is reasonable, your indexing is carefully thought out, your SQL is well structured, and you haven t introduced inefficiencies in the outer levels of code, you could still have performance problems because the optimizer can t cope with your SQL. You have seen that you may be able to pinpoint a bug in the optimizer by stripping complicated production code back to the minimum. You have also seen that it s possible to find optimization strategies that are obvious to the human eye but not yet coded into the optimizer. Apart from these issues, you also know that the optimizer can pick the wrong path because it is simply not possible for it to determine how much data it is going to have to process. Although some of the problems of estimating data volumes are inherently impossible for the optimizer to handle, in some cases we can supply statistical information that helps the optimizer produce better estimates of volume and (equally important) the pattern of data scatter. The critical strategy then is to do the minimum amount of work while ensuring that the optimizer gets good enough figures. Whatever the problems the optimizer has with statistics, though, we need to recognize that a single, simple, strategy for gathering statistics is unlikely to produce an ideal set of statistics for anything other than the simpler applications. We need to design a mechanism that is easy to manage but allows special handling for critical objects at a detailed level. The obvious difficulty is that some applications have literally tens of thousands of tables (or partitions thereof) and indexes and it would be undesirable to have to worry about every object (and subobject) separately. Given the potential complexity (and sheer size) of a framework for controlling statistics, the best bet seems to be to use a basic generic approach to generate most statistics and then follow this up with a table-driven approach for exceptions. Although there are difficulties in implementing such a system, it can be done incrementally. Usually only a few special cases need to be corrected after an easily implemented driving mechanism has run (such as a call to Oracle s automatic statscollection routine with histogram collection disabled). In a nutshell, the mechanisms you need to create are as follows: A default mechanism that generates statistics for objects that need them (for example, Oracle s gather stale) A mechanism to identify any objects that dropped out of sight of the default mechanism A mechanism for unlocking and locking stats on objects that must not be touched by the default mechanism A follow-up that checks whether any of the gathered stats need to be fixed, or whether any special cases need handling A custom mechanism for dealing with each partitioned object
This works with CLOBs as well as BLOBs. Loading a directory of text files using SQLLDR in this fashion is easy.
CHAPTER 5 GROUPING AND TOTALING PIVOT TABLE DATA
INTRODUCING SILVERLIGHT
Your results may vary, of course, depending on the data in your database.
Adds the specified CSS class to the ListView control. Can be used to (for example) change the style of the control based on the current circumstances, such as changing the color to red if the dataset is currently dirty. Passes the cursor to this control. If the control is off the screen, scrolls the browser until it is visible. Removes the specified CSS from the ItemView control. In a similar manner to addCssClass, you can change the visual state of the control based on the current circumstances. Complements the add and remove CSS class methods. If the class is currently active, this will turn it off; otherwise, it will turn it on. Adds a new item to the underlying dataset. This will make the dataset dirty. Removes the current item. This will make the dataset dirty. Moves to the next record in the dataset and triggers the binding of all controls within the ItemTemplate that are bound to it. Moves to the previous record in the dataset and triggers the binding of all controls within the ItemTemplate that are bound to it.
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