The data portal combines two common design patterns: channel adapter and message router. The channel adapter pattern provides a great deal of flexibility for n-tier applications by allowing the application to switch between 2-tier and 3-tier models, as well as switching between various network protocols. The message router pattern helps to decouple the client and server by providing a clearly defined, single point of entry for all server interaction. Each call to the server is routed to an appropriate server-side object.
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class AttributeTester<T> where T : Attribute { public bool TestForFieldAttribute(Type classType, string fieldName) { FieldInfo fieldInfo = classType.GetField(fieldName); return Attribute.IsDefined(fieldInfo, typeof(T)); } public T GetFieldAttribute(Type classType, string fieldName) { FieldInfo fieldInfo = classType.GetField(fieldName); return Attribute.GetCustomAttribute(fieldInfo, typeof(T)) as T;
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There are two ways you could have stored and handled the locations of everything on the map. One method is to have a map array of 25 25 ints and set the map data for the coordinate of an item to that item s code. For instance:
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3. Name the Buttons StartWebcamBtn, TakeSnapShotBtn, and SaveImgBtn so that your
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A Resource directory table structure is defined in Winnt.h as follows: typedef struct _IMAGE_RESOURCE_DIRECTORY { DWORD Characteristics; DWORD TimeDateStamp; WORD MajorVersion; WORD MinorVersion; WORD NumberOfNamedEntries; WORD NumberOfIdEntries; } IMAGE_RESOURCE_DIRECTORY, *PIMAGE_RESOURCE_DIRECTORY; The roles of these fields should be evident, in light of the preceding discussion about structuring unmanaged resources and the Resource directory tables. One exception might be the Characteristics field, which is reserved and should be set to 0. Name entries, which use strings to identify the type, name, or language, immediately follow the Resource directory table. After them, ID entries are stored. A Resource directory entry (either a name entry or an ID entry) is an 8-byte structure consisting of two 4-byte unsigned integers, defined in Winnt.h as follows: typedef struct _IMAGE_RESOURCE_DIRECTORY_ENTRY { union { struct { DWORD NameOffset:31; DWORD NameIsString:1; }; DWORD Name; WORD Id; }; union { DWORD OffsetToData; struct { DWORD OffsetToDirectory:31; DWORD DataIsDirectory:1; }; }; } IMAGE_RESOURCE_DIRECTORY_ENTRY, *PIMAGE_RESOURCE_DIRECTORY_ENTRY; If the top bit of the first 4-byte component is set, the entry is a name entry, and the remaining 31 bits represent the name string offset; otherwise, the entry is an ID entry, and 16 less significant bits of it hold the ID value. If the top bit of the second 4-byte component is set, the item, whose offset is represented by the remaining 31 bits, is a next-level Resource directory table; otherwise, it is a Resource data description.
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In the previous two patterns, wait-until-done and polling, the initial thread continues on with its flow of control only after it knows that the spawned thread has completed. It then retrieves the results and continues. The callback pattern is different in that once the initial thread spawns the asynchronous method, it goes on its way without synchronizing with it again. When the asynchronous method call completes, the system invokes a user-supplied method to handle its results, and to call the delegate s EndInvoke method. This user-defined method is called a callback method, or just callback. The two extra parameters at the end of the BeginInvoke parameter list are used with the callback method as follows: The first of the two parameters, the callback parameter, is the name of the callback method. The second parameter, the state parameter, can be either null or a reference to an object you want passed into the callback method. You ll be able to access this object through the method s IAsyncResult parameter using its AsyncState property. The type of this parameter is object.
Alternatively, you can group all of the statements that use a local variable inside the same code block, like this: public void PerformCalculation(int x, int y) { try { int result = x * y; Console.WriteLine("Result: {0}", result); } catch (Exception) { // handle exception... } }
SQL functions may be used against LOB types.
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