Are these two expressions the same?
public class MyClass
{
public int A { get; } = Random.Shared.Next(1000);
public int B => Random.Shared.Next(1000);
}
The short answer is, no they are not! If we run the example:
var m = new MyClass();
Console.WriteLine(m.A);
Console.WriteLine(m.A);
Console.WriteLine(m.B);
Console.WriteLine(m.B);
public class MyClass
{
public int A { get; } = Random.Shared.Next(1000);
public int B => Random.Shared.Next(1000);
}
We get the following result:
803
803
912
431
So { get; } = evaluates the expression on etime and puts it into the backing field, whereas the lambda expression "calls" the member on every access. The lowered code shows this pretty obviously:
public class MyClass
{
[CompilerGenerated]
private readonly int <A>k__BackingField = Random.Shared.Next(1000);
public int A
{
[CompilerGenerated]
get
{
return <A>k__BackingField;
}
}
public int B
{
get
{
return Random.Shared.Next(1000);
}
}
}
