C# is an object-oriented language. In object-oriented thinking, there are only objects, and everything can be described by classes. So for example, these, int, bool, char, string, double, long, etc. are all classes, then things like 30, 2.5, "test" are all objects of the corresponding class.
It can be seen that they have the ToString() method, so they are objects. When writing code in daily life, in addition to the above-mentioned ones, I have definitely used it to define data types:
This is actually a mechanism of .NET. .NET is a platform. On this platform There are languages like C# and VB. Therefore, .NET defines a series of types that are mapped to different languages. Int32 is int in c#. Such data types are called primitive types. In C#, class objects must be generated using new. This part of the class can be directly represented by constants. Primitive types are defined in the .net Framework under the System namespace. Take a look at the type mapping of primitive types in the C# language.
public class ClassPositiveNumber : ICloneable
{
private int number;
public int Number
{
get
{
return this.number;
}
set
{
if (value <= 0)
{
throw new Exception();
}
this.number = value;
}
}
//引用类型自己可以初始化为null,无需定义初始值
//public readonly static ClassPositiveNumber InitialValue = new ClassPositiveNumber();
public ClassPositiveNumber(int value)
{
if (value <= 0)
{
throw new Exception();
}
this.number = value;
}
public object Clone()
{
return new ClassPositiveNumber(this.number);
}
}
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The difference between multithreading and asynchronous is that multithreading executes multiple threads at the same time, while asynchronously performs operations without blocking the current thread. Multithreading is used for compute-intensive tasks, while asynchronously is used for user interaction. The advantage of multi-threading is to improve computing performance, while the advantage of asynchronous is to not block UI threads. Choosing multithreading or asynchronous depends on the nature of the task: Computation-intensive tasks use multithreading, tasks that interact with external resources and need to keep UI responsiveness use asynchronous.
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