How Do `typeof`, `GetType`, and `is` Differ in C# Type Checking?

C# type examination:

, and typeof comparison GetType is When processing types in C#, there are many ways to check the type of object or variable. Understanding the difference between , and

is essential for effective types of inspection.

typeof GetType is

The operator is a compilation operator, which returns a object that indicates the specified type. It is usually used to compare the type of object during compilation. For example: typeof

typeof Type

Method return the type of runtime of the instance. It is used to determine the type of the object during runtime, even if it does not know the actual type when compiling. For example:

<code class="language-csharp">Type t = typeof(int);
if (t == typeof(int))
    // 一些代码</code>

GetType

The operator is a runtime operator. If the instance is located in the specified inheritance tree, it returns GetType. It is usually used to check whether the object is a specific type or its derivative type. For example:

<code class="language-csharp">object obj1 = 5;
if (obj1.GetType() == typeof(int))
    // 一些代码</code>

Main differences is

is: Operation during compilation, provide type information based on the specified type name. true

<code class="language-csharp">object obj1 = 5;
if (obj1 is int)
    // 一些代码</code>

: Operation during runtime, retrieve the actual type of instance.

: Operation at runtime, check whether the instance is a given type or its inheritance tree.
• typeof Precautions
• The best choice of these three methods depends on the specific scene. Priority is used to perform type examinations during compilation to ensure type compatibility as soon as possible. GetType It is useful when checking the instance type, such as in dynamic code scenarios. The operator is convenient to check the inheritance relationship during runtime.
• Example is Consider the following code:

In this example, if is an instance of ,

will return

, because typeof inherit GetType. However, and return is when

actually

instances. Back when is

instance.

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