CODEWITHSUNDEEP
c#winformscontrolsruntime
Ahoura Ghotbi
Ahoura Ghotbi

Reputation: 2896

Change the location of an object programmatically

I've tried the following code: 

 this.balancePanel.Location.X = this.optionsPanel.Location.X;

to change the location of a panel that I made in design mode while the program is running but it returns an error:

Cannot modify the return value of 'System.Windows.Forms.Control.Location' because it is not a variable.

So how can I do it?

Upvotes: 44

Views: 150229

Answers (6)

bagz_man
bagz_man

Reputation: 575

If somehow balancePanel won't work, you could use this:

this.Location = new Point(127, 283);

or

anotherObject.Location = new Point(127, 283);

Upvotes: 5

shf301
shf301

Reputation: 31394

Use either:

balancePanel.Left = optionsPanel.Location.X;

or

balancePanel.Location = new Point(optionsPanel.Location.X, balancePanel.Location.Y);

See the documentation of Location:

Because the Point class is a value type (Structure in Visual Basic, struct in Visual C#), it is returned by value, meaning accessing the property returns a copy of the upper-left point of the control. So, adjusting the X or Y properties of the Point returned from this property will not affect the Left, Right, Top, or Bottom property values of the control. To adjust these properties set each property value individually, or set the Location property with a new Point.

Upvotes: 9

Praveen
Praveen

Reputation: 195

When the parent panel has locked property set to true, we could not change the location property and the location property will act like read only by that time.

Upvotes: 0

Mark Byers
Mark Byers

Reputation: 838276

The Location property has type Point which is a struct.

Instead of trying to modify the existing Point, try assigning a new Point object:

 this.balancePanel.Location = new Point(
     this.optionsPanel.Location.X,
     this.balancePanel.Location.Y
 );

Upvotes: 77

Marc Gravell
Marc Gravell

Reputation: 1062865

Location is a struct. If there aren't any convenience members, you'll need to reassign the entire Location:

this.balancePanel.Location = new Point(
    this.optionsPanel.Location.X,
    this.balancePanel.Location.Y);

Most structs are also immutable, but in the rare (and confusing) case that it is mutable, you can also copy-out, edit, copy-in;

var loc = this.balancePanel.Location;
loc.X = this.optionsPanel.Location.X;
this.balancePanel.Location = loc;

Although I don't recommend the above, since structs should ideally be immutable.

Upvotes: 17

Ash Burlaczenko
Ash Burlaczenko

Reputation: 25445

You need to pass the whole point to location

var point = new Point(50, 100);
this.balancePanel.Location = point;

Upvotes: 3

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