如何从 C# 8 switch 表达式 return 转换为属性和两个本地声明的变量？

Question

我有这段代码，效果很好：

        var (msg, isCC, upd) = Settings.Mode switch
        {
            MO.Learn => ("Use this mode when you are first learning the phrases and their meanings.",
                                Settings.Cc == CC.H,
                                false),
            MO.Practice => ("Use this mode to help you memorize the phrases and their meanings.",
                                Settings.Cc == CC.H,
                                false),
            MO.Quiz => ("Use this mode to run a self marked test.",
                                Settings.Cc == CC.H,
                                true),
            _ => ("", false, false)
        };

但在实际的应用程序中，我想将一个值 return 转换为属性并在此处分配给多个位置：

    string _modeMessage2;
    public string ModeMessage2 { get => _modeMessage2; set => SetProperty(ref _modeMessage2, value); }

尝试这行不通：

        var (this.ModeMessage2, isCC, upd) = Settings.Mode switch
        {
            MO.Learn => ("Use this mode when you are first learning the phrases and their meanings.",
                                Settings.Cc == CC.H,
                                false),
            MO.Practice => ("Use this mode to help you memorize the phrases and their meanings.",
                                Settings.Cc == CC.H,
                                false),
            MO.Quiz => ("Use this mode to run a self marked test.",
                                Settings.Cc == CC.H,
                                true),
            _ => ("", false, false)
        };

有谁知道如何在不添加如下代码的情况下 return 将值 return 放入 ModeMesage2 中？

ModeMessage2 = msg;

Answer 1

如果左边的所有项目都是字段或属性，那么它将起作用，如果您随后尝试将其中一项更改为 var isCC 之类的表达式，那么您将收到一个编译器错误，提示您不能混合表达式和声明。

很遗憾，这不受支持。

如何从 C# 8 switch 表达式 return 转换为属性和两个本地声明的变量？

How can I return from a C# 8 switch expression into a property and two locally declared variables?

c#

c#-8.0

如何从 C# 8 switch 表达式 return 转换为 属性 和两个本地声明的变量？

How can I return from a C# 8 switch expression into a property and two locally declared variables?

c#

c#-8.0

如何从 C# 8 switch 表达式 return 转换为属性和两个本地声明的变量？