Are There Better Alternatives to Simulating a Switch on Type in C#?

Is there a better alternative to switching according to the type?

The code fragment provided is a common method that simulates the switching according to the type in C#. When the type cannot be actually switched according to the type because of the type relationship, this method can be used. However, in different scenarios, there may be several more suitable alternatives.

C# 7 and higher versions

With the introduction of C# 7, it can be switched to realize the real type according to the mode match:

C# 6

<code class="language-csharp">switch(shape)
{
    case Circle c:
        WriteLine($"圆形，半径为 {c.Radius}");
        break;
    case Rectangle s when (s.Length == s.Height):
        WriteLine($"{s.Length} x {s.Height} 正方形");
        break;
    case Rectangle r:
        WriteLine($"{r.Length} x {r.Height} 矩形");
        break;
    default:
        WriteLine("<未知形状>");
        break;
    case null:
        throw new ArgumentNullException(nameof(shape));
}</code>

In C# 6, you can use the nameof () operator in the switch statement:

C# 5 and earlier versions

<code class="language-csharp">switch(o.GetType().Name) {
    case nameof(AType):
        break;
    case nameof(BType):
        break;
}</code>

Before C# 5, you can still simulate switching according to the type, but this requires a string containing the type name:

Which alternative to choose depends on the specific requirements of the application and the C# version used.

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