Re: Alright. How the heck to they do it? - C# Discussion Boards

Re: Adding dynamically a custom user control into a dockPanel in xaml file

4-Dec-17 3:11

Why can't you design the user control (ostensibly in the designer), and then instantiate/display it where it's needed?

Also, if you want it to be a window, I would start with a window instead of a user control. A window can be reduced to no border or title bar if that's what you want.

If you want it in a panel that is only displayed under certain conditions, simply place the usercontrol in the parent container, and collapse the parent container when you don't want it to be displayed.

".45 ACP - because shooting twice is just silly" - JSOP, 2010
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You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
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When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013

Mycroft Holmes4-Dec-17 13:21

Mycroft Holmes

4-Dec-17 13:21

Here is another idea, change the collection serving a single combobox. Data is quicker than UI!

I would have a collection of an ID/Display class and just reload it in the VM according to the parameters.

Never underestimate the power of human stupidity
RAH

Re: Adding dynamically a custom user control into a dockPanel in xaml file

Gerry Schmitz4-Dec-17 18:59

Gerry Schmitz

4-Dec-17 18:59

When you add controls on-the-fly, the Visibility can default to hidden; "panels" may not expand; and / or you need to "redo the layout". There's also the question of how you defined / added content to the "window"; which you did not show. Lots of potential failure points.

"(I) am amazed to see myself here rather than there ... now rather than then".
― Blaise Pascal

Alright. How the heck to they do it?

#realJSOP3-Dec-17 6:37

3-Dec-17 6:37

The EditorFor method in MVC allows you to pass route parameters without specifying the type that contains the parameters, like so:

@Html.EditorFor(action, controller, new { id=1, otherparam="testing" })

I don't know what the technique is actually called, so I my google searches were fruitless. How does the method know how to deal with the random properties?

The best I could come up with was a strongly typed dictionary class that is best used to handle intrinsic types, like so:

@Html.EditorFor(action, controller, new Properties(){ {"id",1}, {"otherparam","testing"} })

I use the properties by calling the Property object's GetValue method like so:

int id = property.GetValue("id", -1);

-1 is a default value that is returned if the specified key does not exist, or if its value can't be cast to the type represented by the left side of the expression.

I tried looking at ExpandoObject, anonymous types, and that kind of thing, but coldn't really find a way to do what they are doing .

modified 3-Dec-17 15:35pm.

Luc Pattyn3-Dec-17 11:33

Luc Pattyn

3-Dec-17 11:33

Hi JSOP,

they keep adding sugar coating to C#, what you have seems to be an example of Anonymous Types[^]

Not my cup of < T >.

If you want to know the internal techniques I would suggest you use ILDASM, ILspy or some similar tool, or start wading through the .NET source code itself.

Smile | :)

Luc Pattyn [My Articles] Nil Volentibus Arduum

modified 3-Dec-17 17:42pm.

Nathan Minier4-Dec-17 1:18

Nathan Minier

4-Dec-17 1:18

Luc Pattyn wrote:
Not my cup of < T >.

I love a good pun, but this might have caused a small organ rupture on viewing.

"There are three kinds of lies: lies, damned lies and statistics."
- Benjamin Disraeli

Kenneth Haugland4-Dec-17 0:30

Kenneth Haugland

4-Dec-17 0:30

You probably found it out by now, but you could build your own function that can receive it as well:
c# - How to pass anonymous types as parameters? - Stack Overflow[^]

the code from the link:

var query = from employee in employees select new { Name = employee.Name, Id = employee.Id };
LogEmployees(query);

and the function:

public void LogEmployees (IEnumerable<dynamic> list)
{
    foreach (dynamic item in list)
    {
        string name = item.Name;
        int id = item.Id;
    }
}

#realJSOP4-Dec-17 3:02

4-Dec-17 3:02

I'm trying to do this:

SomeRandomMethod(blah, blah, new { id=1,mystring="text"})

and when I get here:

public void SomeRandomMethod(dynamic obj)
{
    int id = obj.id;
    string text = obj.mystring;
}

the code throws exceptions because the properties don't exist.

Some might say, create a class with the same properties and cast it in the method, but then what's the point? If it's gotta be strongly typed, then it should be strongly typed where you're creating the instance (IMHO).

Kenneth Haugland4-Dec-17 3:12

Kenneth Haugland

4-Dec-17 3:12

I used the latest .NET release with the latest version of C# (in WPF), and it works for me.

#realJSOP4-Dec-17 3:15

4-Dec-17 3:15

I'm using .Net 4.5 and MVC (not that the framework should have anything to do with it).

Richard Deeming4-Dec-17 4:32

Richard Deeming

4-Dec-17 4:32

It's probably just you simplifying it for the question, but why are you calling the method with three parameters, when it only takes one? Smile | :)

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

#realJSOP4-Dec-17 7:03

4-Dec-17 7:03

I was just trying to illustrate the way I was trying to use the construct. If I instantiate it BEFORE calling the method, everything is fine. If I instantiate it in the call to the method (as I showed), it fails. I can't instantiate it before calling the method because I'm calling it in a MVC view.

While we're batting this around, I've gone ahead and created a series of classes that support the desire parameters. This is part of my over-arching effort to over-engineer some extension methods. Smile | :)

Nathan Minier4-Dec-17 1:21

Nathan Minier

4-Dec-17 1:21

Like many, many things in the ASP.NET world, this is handled via reflection on the back end.

"There are three kinds of lies: lies, damned lies and statistics."
- Benjamin Disraeli

Richard Deeming4-Dec-17 2:03

Richard Deeming

4-Dec-17 2:03

There's a static helper method on the System.Web.Mvc.HtmlHelper class:
public static RouteValueDictionary AnonymousObjectToHtmlAttributes(object htmlAttributes)[^]

That delegates to the System.Web.WebPages.Html.HtmlHelper class:
public static RouteValueDictionary AnonymousObjectToHtmlAttributes(object htmlAttributes)[^]

That uses the internal System.Web.WebPages.HtmlAttributePropertyHelper[^] class, which inherits from the PropertyHelper[^] class, which finally uses reflection to read the properties of the anonymous type:
protected static PropertyHelper[] GetProperties(object instance, Func<PropertyInfo, PropertyHelper> createPropertyHelper, ConcurrentDictionary<Type, PropertyHelper[]> cache)[^]

If you just want to use the same behaviour, the simplest option is to call the helper method.

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

#realJSOP4-Dec-17 3:03

how to clear file folder search on computer?

4-Dec-17 3:03

Richard Deeming wrote:
If you just want to use the same behaviour, the simplest option is to call the helper method.

In my world (either by design or by happenstance), it's almost never a case of "just simply". Smile | :)

Le@rner1-Dec-17 18:59

Le@rner

1-Dec-17 18:59

hi all

can anybody suggest me how to clear file folder search on computer?

please help me from where i can start?

thanks in advance.

OriginalGriff1-Dec-17 20:05

OriginalGriff

1-Dec-17 20:05

If you mean the search history in Explorer: How to Delete the Search History in Windows File Explorer[^] - but this is not a "help me with my computer" site: please ask development related question here in future.

If you don't, then I have no idea what you do mean, and you need to explain in a lot better detail: remember that we can't see your screen, access your HDD, or read your mind - we only get exactly what you type to work with.

Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!

Richard MacCutchan1-Dec-17 22:03

Richard MacCutchan

1-Dec-17 22:03

format C:

Mycroft Holmes2-Dec-17 12:40

Mycroft Holmes

2-Dec-17 12:40

No no he only wants to clear the search thingy. Pop it open and use whiteout.

Never underestimate the power of human stupidity
RAH