VB to C# Functions

Question

Which are the equivalent of the following operators from VB.Net to C#?

• UBound()
• LBound()
• IsNothing()
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Answer 1

Another one...

VB - IsDBNull(value)

C# - yourdatarow.IsNull("columnName")

Answer 2

If you look on MSDN you see that most of the time there are sample code for both languages.

Answer 3

One more addition to this could be IndexOf() function to Find String within string

An example below...

string MainString = "String Manipulation"; 
string SearchString = "pul"; 
int FirstChr = MainString.IndexOf(SearchString); 
//SHOWS START POSITION OF STRING 
MessageBox.Show("Found at : " + FirstChr );

Answer 4

First of all, most of those are NOT operators. They are functions, and the functions are only included in VB.Net for compatibility reasons. That means you shouldn't use them in VB.net either, and instead use the equivalents provided by the new API.

• UBound() — arrayVar.Length
• LBound() — obsolete, lower bound is always 0 in a normal .Net array
• IsNothing() — obsolete. Use Is Nothing in VB.Net and == null in C#
• Chr() — Convert.ToChar() or (char)someVar
• Len() — stringVar.Length use this in VB too
• UCase() — stringVar.ToUpper() use this in VB too
• LCase() — stringVar.ToLower() use this in VB too
• Left() — stringVar.Substring(0, n) use this in VB too
• Right() — stringVar.Substring(stringVar.Length - n) use this in VB too
• RTrim() — stringVar.TrimEnd() use this in VB too
• LTrim() — stringVar.TrimStart() use this in VB too
• Trim() — stringVar.Trim() use this in VB too
• Mid() — stringVar.Substring(n, m) use this in VB too
• Replace() — stringVar.Replace() use this in VB too
• Split() — stringVar.Split() use this in VB too
• Join() — String.Join() use this in VB too
• MsgBox() — MessageBox.Show()
• IIF() — (condition) ? truepart : falsepart - note that there are some differences, because "?" is an operator and not a function

Answer 5

I believe some of these like Mid() are still available in the .NET Framework in the Microsoft.VisualBasic namespace which you can still reference from C# code.

Answer 6

The space function is missing from everyone else's list:

Space(16) -> new String(" ", 16)