How can I get class information by property w/ reflection C#

Question

I have code:

// 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 };
}

And implement code like:

// 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;
    }
}

How can i get MenuPermiss CLASS by MenuPermiss.PermissEdit param?

Please make your code compile first. A `bool` method cannot return a `string`, your `set;` is missing a semicolon, your method signature does not fit `DoSomething` and I'm fairly sure all the static stuff will cause issues as well. How will you pass a static class as a parameter to a method? It implies creating an instance. — Jeroen Vannevel, Nov 19 '13 at 03:25
so you want to pass in a class/property as a string then retrive the class info based on that property and return a bool that is a string? — sa_ddam213, Nov 19 '13 at 03:27
http://stackoverflow.com/questions/10338018/how-to-get-a-property-value-using-reflection — Abin, Nov 19 '13 at 03:27
Thanks for your comment. @sa_ddam213: I have edited, DoSomething method return false. We are only get MyClass info, no more :) — minhhungit, Nov 19 '13 at 03:34
@Abin Mathew: Thanks, but I only wanna get class info instead of value of property — minhhungit, Nov 19 '13 at 03:39
The problem is you are passing a string value into `DoSomething`, at the least you are going to have to pass in the PropertyInfo of MyProperty to get any information on the class it belongs to. — sa_ddam213, Nov 19 '13 at 03:42
@All: So so sorry for my code. I modified. Thanks for help :) — minhhungit, Nov 19 '13 at 04:08

score 1 · Accepted Answer · answered Nov 19 '13 at 03:43

1

It is not possible using this syntax:

ImplementClass.DoSomething(MyClass.MyProperty);

but possible with this one:

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

Solution:

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;
    }
}

answered Nov 19 '13 at 03:43

max

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I modified my question, please check again, thanks so much (y) – minhhungit Nov 19 '13 at 04:13
It worked, thanks so much! Can you help me with lasted code? Currently, I pass param as entity class, not string value. – minhhungit Nov 19 '13 at 04:22

score 0 · Answer 2 · edited May 23 '17 at 12:28

Link reference here:

It work good with syntax:

PermissHelper.CheckPermiss(()=>MenuPermiss.PermissDelete)

I try implement with this code, and it's return "<>c__DisplayClass0" value. How to fix it?

PermissHelper.CheckPermiss(MenuPermiss.PermissDelete)

and

public static string CheckPermiss(PermissInfo permissInfo)
{
    Expression<Func<PermissInfo>> x = () => permissInfo;

    var memberInfo = ((MemberExpression)x.Body).Member;
    var declaringType = memberInfo.DeclaringType;

    return declaringType != null ? declaringType.Name : "";
}

How can I get class information by property w/ reflection C#

2 Answers2