C# calling Bitmap image

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1.50/5 (2 votes)

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Hi,
I am beginner, and I have a problem, maybe someone can help me.

I have Bitmap images:

C#

private static readonly Bitmap a1 = new Bitmap(WorkFolder4 + "a1.png");
private static readonly Bitmap a2 = new Bitmap(WorkFolder4 + "a2.png");
private static readonly Bitmap a3 = new Bitmap(WorkFolder4 + "a3.png");
//what I need is to call them using crafted variable name (methods first parameter is one of my images):

for (int k = 1; k < 20; k++)
   {
string temp = "a" + Convert.ToString(k);
//at this time temp = "a1",....
method(temp);
}

Please Help,

Posted 24-Jan-11 3:05am

molonuke

Updated 24-Jan-11 3:13am

Sandeep Mewara

v3

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Sandeep Mewara 24-Jan-11 9:13am

Use PRE tags to format code part, it makes the question readable.

shakil0304003 24-Jan-11 9:13am

Not clear!!!

2 solutions

Solution 2

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C#

//what I need is to call them using crafted variable name (methods first parameter is one of my images):

for (int k = 1; k < 20; k++)
{
   string temp = "a" + Convert.ToString(k);

   //First way
   Bitmap bitmap = new Bitmap(WorkFolder4 + temp);
   method(temp);
   //or Second Way
   method( new Bitmap(WorkFolder4 + temp) );
}

Posted 24-Jan-11 3:38am

Tim Groven

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Manfred Rudolf Bihy · Accepted Answer · 2011-01-24T03:28:00

Though this is possible by using functionality from the .NET System.Reflection API. I beg of you not to do this. Take this route instead by adding all Bitmaps to an array or a list and you can easily iterate over that:

C#

private List<Bitmap> myBitmaps = new List<Bitmap>();

private static readonly Bitmap a1 = new Bitmap(WorkFolder4 + "a1.png");
myBitmap.Add(a1);
private static readonly Bitmap a2 = new Bitmap(WorkFolder4 + "a2.png");
myBitmap.Add(a2);
private static readonly Bitmap a3 = new Bitmap(WorkFolder4 + "a3.png");
myBitmap.Add(a3);
// Iterate over the Bitmaps in the list
foreach(Bitmap bm in myBitmaps)
{
    method(bm);
}

Your method needs to to have a parameter of type Bitmap for this or course. You might also think about having an array / List of the image paths and build a loop over that where you create the bitmaps and call your method:

C#

private List<String> imagePaths = new List<String>();
imagePaths.Add(WorkFolder4 + "a1.png");
imagePaths.Add(WorkFolder4 + "a2.png");
imagePaths.Add(WorkFolder4 + "a3.png");

// iterate over the strings in your list to create and process the Bitmaps
foreach(String path in imagePaths)
{
    Bitmap bm = new Bitmap(path);
    method(bm);
}

Unless your method "method" stores or uses the Bitmaps somehow you'd have to put them into an array or a list so you can still access them later. (Does WorkFolder4 end in a backslash?)

Hope this helps! If you have question leave me a comment.

Regards,
Manfred