空字符串，空集合，初始化用他们

class DummyModel
{
    public string DummyString { get; } = string.Empty;

    public string[] DummyArray { get; } = [];

    public Process? DumbProcess { get; }    
}

 

foreach 的时候不应去判断 DummyArray == null && DummyArray.Count != 0

直接 foreach (var item in DummyArray) 便可。