C# Casting: Direct Cast vs. `as` Operator: When to Use Which?

The comparison of directly conversion and

operational symbols as In C#, the conversion between different data types is an important aspect in programming. When the object is converted from one type to another type, there are two main methods: direct conversion and use of

operators.

as Direct conversion, as shown in the first line of the code fragment, involves the use of

grammar to explicitly convert the object to the required type. If the object cannot be converted to a specified type, this method will trigger

abnormal. However, even if the object is null, it will give the value to the variable. (type) InvalidCastException In contrast,

The operator (shown in the second line) attempts to convert the object into a specified type without causing abnormalities. If the conversion fails, it will give NULL to the variable. This behavior is particularly useful when processing cannot return NULL.

as The third method, using

, is not a way of conversion. Instead, it calls the "🎜> method of the object to obtain its string representation. This method provides flexibility because it is suitable for any type of object. However, when it is applied to NULL objects, it may cause abnormalities.

ToString() Select the right conversion type ToString()

The choice of conversion method depends on the specific scene. Generally, due to its simplicity and explicit processing of invalid conversion, direct conversion (line 1) is more suitable for most conversion. The operator (line 2) is mainly used to accept the result of the NULL value as the result of unsuccessful conversion, or when the use value type.

Finally, when you need the string of the object (no matter what the type),

(line 3) is the most suitable.

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