VB к функциям C#

• UBound() -> if x is an array of string[] for example: x.GetUpperBound();
• LBound() -> if x is an array of string[] for example: x.GetLowerBound();
• IsNothing() -> if (x == null)
• Chr() -> char x = (char)65;
• Len() -> x.Length();
• UCase() -> assume x is a string: x.ToUpper();
• LCase() -> assume x is a string: x.ToLower();
• Left() -> assume x is a string: x.Substring(0, 10); // first 10 characters
• Right() -> assume x is a string: x.Substring(x.Length - 10); // last 10 characters
• RTrim() -> x.TrimEnd();
• LTrim() -> x.TrimStart();
• Trim() -> x.Trim();
• Mid() -> assume x is a string: x.Substring()
• Replace() -> assume x is a string: x.Replace();
• Split() -> assume x is a string: x.Split();
• Join() -> String.Join();
• MsgBox() -> MessageBox.Show();
• IIF() -> ternary operator (x == true ? true-value : false-value);

Если вы посмотрите на MSDN, вы увидите, что в большинстве случаев есть примеры кода для обоих языков.

Another one...

VB - IsDBNull(value)

C# - yourdatarow.IsNull("columnName")

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.

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

IIf (test, trueval, falseval) >> (тест? Trueval: falseval);

IsNothing (obj) >> (obj == null);

UCase (str) >> str.ToUpper ();

LCase (str) >> str.ToLower ();

Большинство из них будут методами экземпляра строкового объекта, которые возвращают измененную строку.

MsgBox vs. MessageBox.Show(..)

IIF vs. (expression?returnValueIfTrue:returnValueElse)

All these functions are member methods of the Microsoft.VisualBasic.Information class, in the Microsoft.VisualBasic assembly, so you can use them directly. However, most of them have C# equivalents, or non language specific equivalents in core .NET framework classes :

• UBound() : Array.GetUpperBound
• LBound() : Array.GetLowerBound
• IsNothing() : == null
• Chr() : (char)intValue (cast)
• Len() : String.Length
• UCase() : String.ToUpper
• LCase() : String.ToLower
• Left(), Right() and Mid() : String.Substring (with different arguments)
• RTrim() : String.TrimEnd
• LTrim() : String.TrimStart
• Trim() : String.Trim
• Replace() : String.Replace
• Split() : String.Split
• Join() : String.Join
• MsgBox() : MessageBox.Show
• IIF() : condition ? valueIfTrue : valueIfFalse (conditional operator)

Links

• Array members
• String members
• MessageBox.Show
• conditional operator

UBound()  "array".Length
LBound()
IsNothing(): "object" == null
Chr()     (char)"N"
Len()     "string".Length
UCase()   "string".ToUpper()
LCase()   "string".ToLower()
Left()    "string".Substring(from, to)
Right()   "string".Substring(from, to)
RTrim()   "string".TrimEnd()
LTrim()   "string".TrimStart()
Trim()    "string".Trim()
Mid()     "string".Substring(from, to)
Replace() "string".Replace()
Split()   "string".Split()
Join()    String.Join()
MsgBox()  MessageBox.Show()
IIF()     validate ? iftrue : iffalse;

Вы найдете преобразование для многих из этих функций на этой странице википедии .