【導(dǎo)讀】足不出戶便可以知曉天下大事,按幾下鍵盤或點幾下鼠標(biāo)可以與。為現(xiàn)代人們生活的一部分。的模式,打破了傳統(tǒng)信息傳播方式的重重壁壘,為人們帶來了新的機遇。機和信息時代的到來,人類社會前進的腳步在逐漸加快。隨著網(wǎng)頁設(shè)計技術(shù)的發(fā)展,豐富多彩的網(wǎng)頁成為網(wǎng)上一道亮麗的。要想設(shè)計美觀實用的網(wǎng)頁就應(yīng)該深入掌握網(wǎng)站建設(shè)技術(shù)。我們分析了網(wǎng)站建立的目的、內(nèi)容、功能、結(jié)構(gòu),應(yīng)用了更多的網(wǎng)頁設(shè)計技術(shù)。進行組織與規(guī)劃。產(chǎn)品是長期競爭的最大優(yōu)勢。及時更新網(wǎng)站內(nèi)容、及時反饋用戶的要求；首頁給訪問者留下的第一印象很重要,設(shè)計務(wù)必精美,以求。產(chǎn)生良好的視覺效果。CSS是一種樣式表技術(shù)。CSS與HTML的結(jié)合方式。將被可提供動態(tài)實時信息,并對客戶操作進行反應(yīng)的Web頁面的取代。運行狀況監(jiān)視和性能功能。態(tài)地生成和呈現(xiàn)網(wǎng)頁。

　　

【正文】 use with a visual design tool such as Visual Studio. Designers enable you to build a designtime user interface for a control, so that developers can configure your control39。s properties and content in the visual design tool. Introduction to the C Language and the .NET Framework C is an elegant and typesafe objectoriented language that enables developers to build a wide range of secure and robust applications that run on the .NET Framework. You can use C to create traditional Windows client applications, XML Web services, distributed ponents, clientserver applications, database applications, and much, much more. Microsoft Visual C 2021 provides an advanced code editor, convenient user interface designers, integrated debugger, and many other tools to facilitate rapid application development based on version of the C language and the .NET Framework. Note The Visual C documentation assumes that you have an understanding of basic programming concepts. If you are a plete beginner, you might want to explore Visual C Express Edition, which is available on the Web. You can also take advantage of any of several excellent books and Web resources on C to learn practical programming skills. 18 C syntax is highly expressive, yet with less than 90 keywords, it is also simple and easy to learn. The curlybrace syntax of C will be instantly recognizable to anyone familiar with C, C++ or Java. Developers who know any of these languages are typically able to begin working productively in C within a very short time. C syntax simplifies many of the plexities of C++ while providing powerful features such as nullable value types, enumerations, delegates, anonymous methods and direct memory access, which are not found in Java. C also supports generic methods and types, which provide increased type safety and performance, and iterators, which enable implementers of collection classes to define custom iteration behaviors that are simple to use by client code. As an objectoriented language, C supports the concepts of encapsulation, inheritance and polymorphism. All variables and methods, including the Main method, the application39。s entry point, are encapsulated within class definitions. A class may inherit directly from one parent class, but it may implement any number of interfaces. Methods that override virtual methods in a parent class require the override 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: ? Encapsulated method signatures called delegates, which enable typesafe event notifications. ? Properties, which serve as accessors for private member variables. ? Attributes, which provide declarative metadata about types at run time. ? Inline 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 19 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. 20 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 Fr