CODEWITHSUNDEEP
c#methods
Susan
Susan

Reputation:

How to pass control to a method

I want to create a method that changes enabled property. How do I pass the contorl name and property to a method.

If the following were my original method:

public void ChangeProperties()
{ 
     btnAcesScore.Enabled = true;
}

I want to be able to change the "btnAcesScore" each time I call this method. How do I pass this to the method. I tried passing it as a string but that doesn't work.

Here is what I tried:

public void ChangeProperties(string category)
{ 
     category = true;
}

ChangeProperties("btnAcesScore.Enabled");

Susan

Upvotes: 5

Views: 16582

Answers (8)

svik
svik

Reputation: 222

  Main()
   {
    ChangeProperties(ref category,True);    //Where Category is the ID  of the Textbox control  i.e <asp:textbox ID="Category "></textbox>
    }

   public void ChangeProperties(ref TextBox category,bool val)
    { 
      category.Enabled = val;
     }

Upvotes: 0

tofi9
tofi9

Reputation: 5853

Try this:

    public void ChangeProperties(string category, object value)
    {      
        var categoryConcat = category.Split('.');
        var control = this.Controls.Cast<Control>()
            .Where(x => x.Name == categoryConcat[0]).First();
        control.GetType().GetProperty(categoryConcat[1])
            .SetValue(control, value);        
    }

The example probably needs some checks on the existance of the control and the property.

Upvotes: 0

Robert Kozak
Robert Kozak

Reputation: 2033

Since the original question had a reflection tag I think she wanted a reflection answer (whether or not that is good design) so here is a Reflection answer.

the form has a controls collection and with this you can search for it and use reflection to set the property:

public void ChangeProperties(Form form, string category)
{
   string[] parts = category.Split(".");
   int index = form.Controls.IndexOfKey(parts[0]);

   Control control = null;
   if (index >= 0)
   {
     control = form.Controls[index].;
   }

   if (control != null)
   {
     PropertyInfo propertyInfo = control.GetType().GetProperty(parts[1]);
     if (propertyInfo != null)
     {
       propertyInfo.SetValue(control, true);
     }
   }
}

if you call it from the form the control lives on 

ChangeProperties(this, "btnAcesScore.Enabled");

Upvotes: 1

Madeleine
Madeleine

Reputation: 2182

I'd use reflection - use the GetType() Method on the object you send through to your method and then use the GetProperties to match against the property you send through. You can then set the values at that point.

Upvotes: 0

John Rudy
John Rudy

Reputation: 37850

What exactly is the purpose of this? Is it to reuse the method to arbitrarily change the Enabled property of any given control? If so, there is an easier way to accomplish it, as outlined by Canavar.

Or is the point of this method to toggle the setting? In which case, your method would look either like:

public void ChangeProperties()
{ 
     btnAcesScore.Enabled = !btnAcesScore.Enabled;
}

or

public void ChangeProperties(Control ctrl)
{ 
     ctrl.Enabled = !ctrl.Enabled;
}

depending on whether you wanted to hit just the one control, or provide access to many. In any event, I personally don't see much point to encapsulating a single property access within a method, and if you were insistent (and this method didn't adjust other properties), I'd at least rename it to something like ToggleEnabled.

Upvotes: 4

n8wrl
n8wrl

Reputation: 19765

Not sure I totally understand your intent, but you could pass a delegate to some code that changed your property...

public void ChangeProperties(Action<bool> setprop)
{
    ...
    setprop(true);
}

then call it:

ChangeProperties(b => btnAcesScore.Enabled = b);

Upvotes: 0

Daniel A. White
Daniel A. White

Reputation: 190942

How about also

void ChangeProperty(ref bool output)
{
    output = true;
}
ChangeProperty(ref btnAcesScore.Enabled);

Upvotes: 0

Canavar
Canavar

Reputation: 48088

Try this : 

public void ChangeProperties(Control ctrl)
{ 
     ctrl.Enabled = true;
}

and call it like that : 

ChangeProperties(btnAcesScore);

Upvotes: 13

Related Questions