switch的模式中有一种叫类型模式,可以根据switch的类型来执行对应的case,这点在代码中用到的比较频繁,特别是在对应同类型对象的操作中。本例是把一组数据,转成一种格式,就是很简单的使用switch类型模式实现,具体见代码:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SwitchDemo;

public class ClassOne
{
public void Run()
{
var entity = new YamlFormatCreater();
var data = new Data();
Console.WriteLine(GetData(entity, data));
}
public string GetDataFormat(IFormatCreater entity, Data data) => entity switch
{
CSVFormatCreater csvFormatCreater => csvFormatCreater.ToCSV(data),
JsonFormatCreater jsonFormatCreater => jsonFormatCreater.ToJson(data),
XMLFormatCreater xmlFormatCreater => xmlFormatCreater.ToXML(data),
YamlFormatCreater yamlFormatCreater => yamlFormatCreater.ToYAML(data),
_ => "this format is not adapted"
};
}

public class Data
{
public int ID { get; set; }
public string? Name { get; set; }
public string? Model { get; set; }
}
public interface IFormatCreater
{ }

public class CSVFormatCreater : IFormatCreater
{
public string ToCSV(Data data)
{
return "To CSV";
}
}
public class JsonFormatCreater : IFormatCreater
{
public string ToJson(Data data)
{
return "To JSON";
}
}
public class XMLFormatCreater : IFormatCreater
{
public string ToXML(Data data)
{
return "To XML";
}
}
public class YamlFormatCreater : IFormatCreater
{
public string ToYAML(Data data)
{
return "To YAML";
}
}

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switch类型模式_xml