【導讀】企業(yè)級Web應用程序所必需的各種服務。當您編寫應用程序的代碼時，可以訪問.NETFramework中。您可以使用與公共語言運行庫兼容的任何語言來編寫應用程序的。通常，您可以對多個。瀏覽器使用相同的頁，因為會為發(fā)出請求的瀏覽器呈現(xiàn)適當?shù)臉擞?。網(wǎng)頁是完全面向?qū)ο蟮摹７ê褪录硖幚鞨TML元素?？蛻舳撕头掌鞲綦x的實現(xiàn)細節(jié)。該框架還會在頁處理生命周期中自動維護頁及。該頁上控件的狀態(tài)?？丶恍杈帉懸淮危纯捎糜谠S多頁并集成到網(wǎng)頁中。這些控件在呈現(xiàn)期間放入網(wǎng)頁中。站的整體外觀和感覺。用戶進行身份驗證和授權，并執(zhí)行其他與安全相關的功能。使用Forms身份驗證和成員資格來管理身份驗證。ASCII文本文件，因此對Web應用程序進行配置更改比較簡單。置方案，使其符合自己的要求。這些事件顯示診斷和監(jiān)視特征的組合，并在記錄哪些。事件以及如何記錄事件等方面提供了高度的靈活性。XMLWebservices是包含業(yè)務功能的組。C#語法表現(xiàn)力強，只有不到90個關鍵字，而且簡單易學。委托、匿名方法和直接內(nèi)存訪問，

　　

【正文】 keyword as a way to avoid accidental redefinition. In C, a struct is like a lightweight class。 it is a stackallocated type that can implement interfaces but does not support inheritance. In addition to these basic objectoriented principles, C facilitates the development of software ponents through several innovative language constructs, including: method signatures called delegates, which enable typesafe event notifications. , which serve as accessors for private member variables. , which provide declarative metadata about types at run time. XML documentation ments. If you need to interact with other Windows software such as COM objects or native Win32 DLLs, you can do this in C through a process called Interop. Interop enables C programs to do just about anything that a native C++ application can do. C even supports pointers and the concept of unsafe code for those cases in which direct memory access is absolutely critical. The C build process is simple pared to C and C++ and more flexible than in Java. There are no separate header files, and no requirement that methods and types be declared in a particular order. A C source file may define any number of classes, structs, interfaces, and events. C programs run on the .NET Framework, an integral ponent of Windows that includes a virtual execution system called the mon language runtime (CLR) and a unified set of class libraries. The CLR is Microsoft39。s mercial implementation of the mon language infrastructure (CLI), an international standard that is the basis for creating execution and development environments in which languages and libraries work together seamlessly. Source code written in C is piled into an intermediate language (IL) that conforms to the CLI specification. The IL code, along with resources such as bitmaps and strings, is stored on disk in an executable file called an assembly, typically with an extension of .exe or .dll. An assembly contains a manifest that provides information on the assembly39。s types, version, culture, and security requirements. When the C program is executed, the assembly is loaded into the CLR, which might take various actions based on the information in the manifest. Then, if the security requirements are met, the CLR performs just in time (JIT) pilation to convert the IL code into native machine instructions. The CLR also provides other services related to automatic garbage collection, exception handling, and resource management. Code that is executed by the CLR is sometimes referred to as managed code, in contrast to unmanaged code which is piled into native machine language that targets a specific system. The following diagram illustrates the piletime and run time relationships of C source code files, the base class libraries, assemblies, and the CLR. Language interoperability is a key feature of the .NET Framework. Because the IL code produced by the C piler conforms to the Common Type Specification (CTS), IL code generated from C can interact with code that was generated from the .NET versions of Visual Basic, Visual C++, Visual J, or any of more than 20 other CTSpliant languages. A single assembly may contain multiple modules written in different .NET languages, and the types can reference each other just as if they were written in the same language. In addition to the run time services, the .NET Framework also includes an extensive library of over 4000 classes anized into namespaces that provide a wide variety of useful functionality for everything from file input and output to string manipulation to XML parsing, to Windows Forms controls. The typical C application uses the .NET Framework class library extensively to handle mon plumbing chores.