I don't know if I ask this right
I
private ArrayList array = new ArrayList ();
private Point [] p;
． ． ．
p = new Point (e.X, e.Y);
An error occurs saying that it is not possible to implicitly convert System.Drawing.Point to System.Drawing.Point []
But I must use arrays
Do you guys know how to solve this problem?
Thank you
Since you stated that Point [] is a set (array), and your current p (eX, eY) is one of the elements, of course, you cannot assign this value. If you want to use it, you can try p [0] = new Point (eX, eY);
I don't know if I'm right. Under the guidance of a master, let me help you.
Does the host mean to record the points passed by the mouse into the ArrayList
Then directly array.Add (new Point (e.X, e.Y)); OK
Don't know what it means to define a Point []?
Because I do n’t just need to record these points, I need to filter these points, save them to the database, and use a for statement to make a loop. So I need to use array
I wonder if everyone has a better way
point p = new point ();
array.add (p);
The array of ArrayList is stored as a set of objects, so using its member functions can insert different objects into the array. There is a boxing process in the middle.
When reading, p = (point) array [0];
There is a process of unboxing
You can use generic List <point> list = new List <point> ();
list.add (p);
point p2 = list [0];
No explicit conversion
Just use private ArrayList array = new ArrayList ();
Add points to the array and add array.Add (new Point (e.X, e.Y));
array is equivalent to an array, and it can also loop
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Post time: 2020-1-11 18:00:01
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