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This article mainly introduces the relevant knowledge of "how to use the empty data types of C#". The editor shows you the operation process through an actual case. The operation method is simple, fast and practical. I hope this article "how to use the empty data types of C#" can help you solve the problem.

C # nullable type (Nullable)

C # provides a special data type, the nullable type (nullable type), which can represent a value within the normal range of its underlying value type, plus a null value.

For example, Nullable

Pronounced "nullable Int32" and can be assigned to any value between-2147483648 and 2147483647, or to a null value Similarly, Nullable

Variables can be assigned as true or false or null.

The ability to assign null to numeric or Boolean types is particularly useful when working with databases and other data types that contain elements that may not be assigned. For example, a Boolean field in a database can store the value true or false, or it can be undefined.

The syntax for declaring a nullable type (nullable type) is as follows:

? = null

The following example demonstrates the use of nullable data types:

Example

Using System

Namespace CalculatorApplication

{

Class NullablesAtShow

{

Static void Main (string [] args)

{

Int? Num1 = null

Int? Num2 = 45

Double? Num3 = new double? ()

Double? Num4 = 3.14157

Bool? Boolval = new bool? ()

/ / display value

Console.WriteLine ("Show values of nullable types: {0}, {1}, {2}, {3}"

Num1, num2, num3, num4)

Console.WriteLine ("A nullable Boolean value: {0}", boolval)

Console.ReadLine ()

}

}

}

When the above code is compiled and executed, it produces the following results:

Display the value of the nullable type: 45, 3.14157 A nullable Boolean value: this is the end of the content on "how to use the nullable data types of C#". Thank you for reading. If you want to know more about the industry, you can follow the industry information channel. The editor will update different knowledge points for you every day.

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