它的代码是更好的：使用" AS"或QUOT;是"？

问题描述

This code:

    if (sheet.Models.Data is GroupDataModel)
    {
        GroupDataModel gdm = (GroupDataModel)sheet.Models.Data;

and this code:

    GroupDataModel gdm = sheet.Models.Data as GroupDataModel;
    if (gdm != null)
    {

Do you recommend any of the two styles above over the other one?

解决方案

I think its better to go for as because it convert as well as you can do check easily ..second one is good

More about this: Explicit and Implicit Casting of object and Role of 'is' and 'as' keyword in Explicit casting

Difference between as and is

• as operator do conversion form one type to another type and return Null if converstionfails. There is no need to conversion again if its convertible.

• is operator checks weather one object is convertible in another type or not and return false if not. So need to convert object to base type if it convertible.

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