1. What is a local type?
C# 2.0 introduces the concept of local types. Local types allow us to divide a class, structure or interface into several parts and implement them in several different .cs files.
Partial types are suitable for the following situations:
(1) The type is particularly large and should not be implemented in one file.
(2) Part of the code in a type is code generated by automated tools and should not be mixed with code written by ourselves.
(3) Multiple people need to collaborate to write a class.
Local types are a pure language layer compilation process that does not affect any execution mechanism - in fact, the C# compiler will still merge the local types of each part into a complete class during compilation.
public partial class Program
{
static void Main(string[] args)
{
}
}
partial class Program
{
public void Test()
{ }
}
2. Partial Type restrictions
(1) Local types are only applicable to classes, interfaces, and structures, and do not support delegation and enumeration.
(2) Each part of the same type must have the modifier partial.
(3) When using local types, all parts of a type must be in the same namespace.
(4) All parts of a type must be compiled at the same time.
3. Points to note about partial types
(1) The keyword partial is a contextual keyword, which only has the meaning of the keyword when placed together with class, struct, and interface. Therefore, the introduction of partial will not affect variables named partial in existing code.
(2) Each part of a local type is usually placed in several different .cs files, but the C# compiler allows us to put them in the same file.
4. Application features of local types
Features on local types have a "cumulative" effect.
partial class Class1{}
[Attribute3, Attribute2("Exit")]
partial class Class1{}
is equivalent to
class Class1 {}
Note: The Attribute2 attribute is allowed to be used multiple times on the class.
5. Modifiers on local types
(1) Access modifiers on various parts of a type must maintain consistency.
(2) If a partial class uses the abstract modifier, the entire class will be considered an abstract class.
(3) If a partial class uses the sealed modifier, the entire class will be considered a sealed class.
(4) Each part of a class cannot use contradictory modifiers. For example, you cannot use abstract on one part and sealed on another part.
(5) If a partial class uses the static modifier, the entire class will be considered a static class.
6. Base classes and interfaces of local types
(1) The base classes specified on each part of a type must be consistent. A section may not specify a base class, but if specified, it must be the same.
(2) Interfaces on local types have a "cumulative" effect.
partial class Class2: Iinterface3 {}
partial class Class2: Iinterface2 {}
is equivalent to

C# and .NET runtime work closely together to empower developers to efficient, powerful and cross-platform development capabilities. 1) C# is a type-safe and object-oriented programming language designed to integrate seamlessly with the .NET framework. 2) The .NET runtime manages the execution of C# code, provides garbage collection, type safety and other services, and ensures efficient and cross-platform operation.

To start C#.NET development, you need to: 1. Understand the basic knowledge of C# and the core concepts of the .NET framework; 2. Master the basic concepts of variables, data types, control structures, functions and classes; 3. Learn advanced features of C#, such as LINQ and asynchronous programming; 4. Be familiar with debugging techniques and performance optimization methods for common errors. With these steps, you can gradually penetrate the world of C#.NET and write efficient applications.

The relationship between C# and .NET is inseparable, but they are not the same thing. C# is a programming language, while .NET is a development platform. C# is used to write code, compile into .NET's intermediate language (IL), and executed by the .NET runtime (CLR).

C#.NET is still important because it provides powerful tools and libraries that support multiple application development. 1) C# combines .NET framework to make development efficient and convenient. 2) C#'s type safety and garbage collection mechanism enhance its advantages. 3) .NET provides a cross-platform running environment and rich APIs, improving development flexibility.

C#.NETisversatileforbothwebanddesktopdevelopment.1)Forweb,useASP.NETfordynamicapplications.2)Fordesktop,employWindowsFormsorWPFforrichinterfaces.3)UseXamarinforcross-platformdevelopment,enablingcodesharingacrossWindows,macOS,Linux,andmobiledevices.

C# and .NET adapt to the needs of emerging technologies through continuous updates and optimizations. 1) C# 9.0 and .NET5 introduce record type and performance optimization. 2) .NETCore enhances cloud native and containerized support. 3) ASP.NETCore integrates with modern web technologies. 4) ML.NET supports machine learning and artificial intelligence. 5) Asynchronous programming and best practices improve performance.

C#.NETissuitableforenterprise-levelapplicationswithintheMicrosoftecosystemduetoitsstrongtyping,richlibraries,androbustperformance.However,itmaynotbeidealforcross-platformdevelopmentorwhenrawspeediscritical,wherelanguageslikeRustorGomightbepreferable.

The programming process of C# in .NET includes the following steps: 1) writing C# code, 2) compiling into an intermediate language (IL), and 3) executing by the .NET runtime (CLR). The advantages of C# in .NET are its modern syntax, powerful type system and tight integration with the .NET framework, suitable for various development scenarios from desktop applications to web services.


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