Question about a LINQ expression with void parameter

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Hi. My question is, is there a difference between this:

C#

private ScreenMenuCategory _selectedCategory;
public ScreenMenuCategory SelectedCategory
{
     get { return _selectedCategory; }
     set { _selectedCategory = value; RaisePropertyChanged(() => SelectedCategory); }
}

and this?

C#

private ScreenMenuCategory _selectedCategory;
public ScreenMenuCategory SelectedCategory
{
    get { return _selectedCategory; }
    set { _selectedCategory = value; RaisePropertyChanged(SelectedCategory); }
}

Thanks in advance.

Posted 25-Sep-13 4:22am

YourAverageCoder

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Richard C Bishop 25-Sep-13 10:33am

Well, obviously there is a syntax difference. Do they both compile? Do they both do the same thing?

YourAverageCoder 25-Sep-13 10:39am

It's just a random code i made up. Obviously there are differences but i don't get them.

Richard C Bishop 25-Sep-13 10:44am

Very well, does the top example even compile?

YourAverageCoder 25-Sep-13 10:51am

No, it says it can't convert from some object to string[].

Richard C Bishop 25-Sep-13 10:57am

I didn't think so. If RaisePropertyChanged() is a method, then the argument you are passing it is not valid code. What datatype does that method expect?

YourAverageCoder 25-Sep-13 11:01am

ValueClass class that has lots of string variables and properties.

BillWoodruff 25-Sep-13 13:15pm

"It's just a random code i made up. Obviously there are differences but i don't get them."

Please do not post code you "made up" that you know does not compile !

However, if you have a piece of code you know works under some circumstances, for someone, and you are having problems getting it to work for you, then posting that code is fine.

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Mehdy Moini · Accepted Answer · 2013-09-25T05:09:00

An Expression<tdelegate> represents the abstract syntax tree of the lambda expression. So you just have to analyze this syntax tree to find out the property name:

C#

protected void RaisePropertyChanged<T>(Expression<Func<T>> propertyExpression)
{
    var memberExpr = propertyExpression.Body as MemberExpression;
    if (memberExpr == null)
        throw new ArgumentException("propertyExpression should represent access to a member");
    string memberName = memberExpr.Member.Name;
    RaisePropertyChanged(memberName);
}