将某些 vb.net 代码转换为 c#

Question

I am converting a class library from vb.net to C#. Everything is fine, but in one function that I am converting I am having trouble with it.

VB.NET Code

Protected Function CloseButtonOfTabPage(ByVal tp As TabPage) As PictureBox
    Return (From item In CloseButtonCollection Where item.Value Is tp Select item.Key).FirstOrDefault
End Function

Where CloseButtonOfTabPage is a System.Collection.Generic.Dictionary

I am having trouble converting this code. Can any body help me?

Answer 1

Assumed your dictionary has the correct types for key and value, this code in C# should do it:

protected PictureBox CloseButtonOfTabPage(TabPage tp)
{
   return CloseButtonCollection
          .Where(item => item.Value == tp)
          .Select(item => item.Key).FirstOrDefault();
}

(and you surely meant CloseButtonCollection is a dictionary, not CloseButtonOfTabPage ).

Answer 2

Also a possible code sample: (using LINQ)

protected PictureBox CloseButtonOfTabPage(TabPage tp)
{
    return (from item in CloseButtonCollection
            where item.Value == tp
            select item.Key).FirstOrDefault();
}