在c＃foreach循环中调用对象成员

Question

I have lot of tab pages in my program and I want to add or remove these pages. I'm using the following statement to do it.

if(this.myControlForm.TabPages.Contains(tabPage1))
{
    this.myControlForm.TabPages.Remove(tabPage1));
}
if(this.myControlForm.TabPages.Contains(tabPage2))
{
    this.myControlForm.TabPages.Remove(tabPage2));
}
[...] //similar code for other tabPages

but it makes too much code when I have a lot of tabpages to add or remove so I want to add them in an array and make a foreach loop but I got an error

my code is :

object[] listToRemove = {tabPage1, tabPage2,tabPage3, ... tabPage20};

foreach ( object itr in listToRemove)
{
    if(this.myControlForm.TabPages.Contains(itr))
    {
        this.myControlForm.TabPages.Remove(itr));
    }
}

Why is this happening, can anyone please help?

Answer 1

Change your listToRemove to be explicitly typed, ie from array of objects to the array of TabPage .

Same story with itr variable in loop.

Contains and Remove methods expects argument to be of type TabPage , not object - that's why you're getting errors.

TabPage[] listToRemove = {tabPage1, tabPage2,tabPage3, ... tabPage20};

foreach (TabPage itr in listToRemove)
{
  if(this.myControlForm.TabPages.Contains(itr))
      this.myControlForm.TabPages.Remove(itr);
}