"The object reference is not set to the instance of the object" I believe that anyone who has written code will encounter this problem regardless of their skill level. This sentence means that we did not initialize the object before referencing it. This is usually caused when the object we reference is empty. This problem often occurs when we pass parameters. At this time, we have to consider whether the parameters we call are empty. The following are the problems I encountered myself: The problem occurred when I called the interface on layer B in the three-tier architecture. According to my own analysis, it was because the called interface was not successfully created because I created the interface through an abstract factory. The error points are as follows: The class name in the code is different from the actual class name. There is an extra 1 in the code. Although it is a careless mistake, the principle of this error must be clarified. This time it may just be a different class name, but it may not be the same next time. Here are other possible reasons for this error that I found on the Internet. I hope it can be helpful to you. 1. ViewStat
1. Instance tutorial of not setting the object reference to the object
##Introduction: "The object reference is not set to the instance of the object" I believe that anyone who has written code will encounter this problem regardless of their technical level. The meaning of this sentence is that we are referencing the object. The object has not been initialized before. This is usually caused when the object we reference is empty. This problem often occurs when we pass parameters. At this time, we have to consider whether the parameters we call are empty. The following is the problem I encountered myself: It occurred when layer B called the interface in the three-tier architecture...
2. A problem that both rookies and veterans cannot avoid - not setting the object reference to an instance of the object
Introduction: "The object reference is not set to the instance of the object" I believe that anyone who has written code will encounter this problem regardless of their technical level. This sentence means that we did not initialize the object before referencing it. This is usually caused when the object we reference is empty. This problem often occurs when we pass parameters. At this time, we have to consider whether the parameters we call are empty.
3. Object reference not set to instance of object OOP-----Class vs. Object Object
Introduction: The object reference is not set to the instance of the object: The object reference is not set to the instance of the object OOP-----Class and object object: It is natural that when we see something, we can quickly reflect that it is What it can do is our accumulated understanding. This way of thinking is almost innate. So have we ever thought about how it is achieved? Use a very simple word - analogy. We have many "models" in our heads, and the appearance of these "models" helps us understand what we see. OOP is based on this idea. We call the "models" in our heads "classes" ", the objects recognized through these "models" are called "objects", use an
#Introduction: The interface party requires xml, but I can’t get through it with xml data. It always says “The object reference is not set to an instance of the object.”, and I can only use xml. There is a return value only after switching to the opposite direction, but it seems that the interface party did not receive the parameters. "The basic information of the group in the message header is incomplete, and the group code, user, and password are required." ini_set("soap.wsdl_cache_enabled", "0"); header ("content-type:text/html;charset=utf-8"); $url = 'http:/
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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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