c# - 我如何通过带有反射 C# 的属性获取类信息

Question

我有代码:

// entity
public class PermissInfo
{
    public int PermissValue { get; set; }
}

// used class
public class MenuPermiss
{
    public static readonly PermissInfo PermissView = new PermissInfo { PermissValue = 1 };
    public static readonly PermissInfo PermissEdit = new PermissInfo { PermissValue = 2 };
    public static readonly PermissInfo PermissDelete = new PermissInfo { PermissValue = 4 };
}

并实现如下代码:

// implement class: check permiss
public static class ImplementClass
{
    // used like: return CheckPermiss(MenuPermiss.PermissEdit);
    public static bool CheckPermiss(PermissInfo permiss)
    {
        // How to get "MenuPermiss" class info by "permiss" param

        return false;
    }
}

如何通过 MenuPermiss.PermissEdit 参数获取 MenuPermiss CLASS？

Answer 1

不可能使用这种语法:

ImplementClass.DoSomething(MyClass.MyProperty);

但这个可能:

ImplementClass.DoSomething(() => MyClass.MyProperty);

解决方法:

using System.Linq.Expressions;

public static class ImplementClass
{
    public static bool DoSomething<T>(Expression<Func<T>> propertyExpression)
    {
        var memberInfo = ((MemberExpression)propertyExpression.Body).Member;
        var declaringType = memberInfo.DeclaringType;

        Console.WriteLine(declaringType.Name); // outputs "MyClass"

        return false;
    }
}