Direct Casting, `as` Operator, or `ToString()`: Which C# Type Conversion Method Should You Choose?

C# type conversion: direct conversion, as operator or ToString()?

In C#, there are many ways to convert the object from one type to another. This article will discuss three common methods: direct conversion,

operator and as method. ToString()

Direct conversion

Directly convert the object

<code class="language-csharp">string s = (string)o;</code>

to

type. If is not actually o, it will throw string abnormal. However, if o is empty, it will still be assigned to the string variable string. InvalidCastException o The operator s

Try to convert the object as into

type. If the conversion is successful, the value is given to

<code class="language-csharp">string s = o as string;</code>

. However, if the conversion fails or is empty, set

to empty. This luck can not be used in the value type, because the value type cannot be NULL. as o Method string s o Strictly speaking, it is not a conversion operation. Instead, it retrieves the string of the object , regardless of its type. If is empty, this method will trigger s abnormal.

Choose the right method ToString()

For most conversion, it is recommended to use direct conversion (method 1). It provides direct behavior and allows abnormal treatment when it is invalid.

<code class="language-csharp">string s = o.ToString();</code>

The operator (method 2) is rarely used because it returns NULL when the conversion fails, which may be misleading. Only under certain circumstances can it benefit, such as the library that depends on the wrong design that depends on the error code rather than an abnormal design. ToString() o Method (Method 3) is not a conversion operation. It should be used when the string representation that needs to be obtained. o

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