C# 中的 Lambda 属性 - "Invalid token in class, struct, or interface member declaration"

Question

在我的项目中，属性分配如下：

[ConfigurationProperty("message", IsRequired = true)]
        public string message=> this["message"] as string;

当我编译代码时出现此错误：

Invalid token '"message"' in class, struct, or interface member declaration Error 4 Identifier expected

Answer 1

表情型成员were introduced in C# 6.0。您将必须针对该版本进行编译或使用遗留成员语法。

作为解决方法，您可以这样做：

[ConfigurationProperty("message", IsRequired = true)]
public string message {
    get {
        return this["message"] as string;
    }
}

Lambda properties in C# - "Invalid token in class, struct, or interface member declaration"