How to access the current form's picturebox in a static method?

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Suppose I have a static method

C#

static void GetImage(ref Byte pbyBuffer) // can not modified the function,which is provided by third parties
{
   //do sth,and then get a bitmap 
   //bitmap Now want to assign to the current form'picturebox ,how to do?
}

Posted 22-Nov-13 22:28pm

gzdreamway

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Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Answer 1 · 2013-11-22T23:03:00

Solution 1

No this is not the correct way.

You should return that Bitmap to the calling function.
Inside the Calling/Parent function, you should assign that to PictureBox.

Posted 22-Nov-13 23:03pm

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

BillWoodruff · Answer 2 · 2013-11-23T09:15:00

You need to either:

1. as Tadit Dash suggests, modify the static method so it returns a bitmap/image to the caller ... or ...

2. pass a reference to the PictureBox to which the bitmap/image is to be assigned to the static method as a parameter.

Keep in mind that a static method "belongs" to the Class it is defined in: it is visible/usable from/in all instances of the Class.

Consider this Class:

C#

public class Class1
{
    public string ID { get; private set; }

    public Class1(string id)
    {
        ID = id;
    }

    public static void showID()
    {
        // error:
        // Keyword 'this' is not valid in a static property, 
        // static method, or static field initializer
        // MessageBox.Show(this.ID);

        // error:
        // An object reference is required for the non-static field, 
        // method, or property
        // MessageBox.Show(ID);
    }
}

What this demonstrates is that a static method has no "knowledge" of which instance of the Class it was called from: you must explicitly pass a reference to the current Class to the static method. Or, you need another variable/field defined as static that holds a reference to the current Class which the static method can access.