Why Does VB.NET Have a Default Form Instance While C# Does Not?

What is the fundamental difference between the instance of VB.NET and the C#window?

VB.NET, each window has a default instance, while C#does not. This difference originated from different design concepts of different languages. VB.NET's attribute directly identifies the instance of the window class, while C#does not have the concept of this default instance.

The default instance of vb.net:

(Name)

The default instance design of vb.net is to facilitate programmers who have migrated from VB6. VB6 programmers are often difficult to distinguish types and types of types, and

attributes allow them to directly access the default instance of the window. There is no default example in C#:

(Name) C#emphasizes the object -oriented principle, and requires programmers to explicitly create instances. Unlike VB.NET, C#does not allow any attributes and methods to name the global name space. Therefore, C#does not provide a mechanism for defining the definition type default instance.

Code example:

In C#, the instance and display of the window are explicit:

In vb.net, it can be implicitly instantiated or explicitly instantiated:

generated IL code:

<code class="language-csharp">// 唯一方法
Form1 frm = new Form1();
frm.Show();</code>

The IL code generated by the two code is different. In the default instance method of VB.NET, use the

instruction to instantiate the

class, and call the

<code class="language-vb.net">' 常用方法一
Form1.Show()

' 常用方法二
Dim frm As New Form1()
frm.Show()</code>

method on the newly created instance. In C#, there is no need to

instructions, and directly call the method on the created instance.

C#can simulate the default instance? newobj Form1 You can simulate the default instance by using static attributes in the C#window class to simulate the default instance. However, this method is not elegant enough and requires additional model code. Show() newobj The reasons for design differences: Form1 Show()

The design differences between VB.NET and C#reflect their respective target users. The default instance characteristics of VB.NET are designed to help programmers who move from VB6. C#focuses on object -oriented principles and encourages the instantiated classes, so that developers can better control the code.

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