Friend Module Test
 
    Friend Num As Integer = -0I
 
    Friend Sub Main()
 
        Console.Title = "Introduciendo valores... By Elektro"
        Console.WriteLine()
 
        Num = ReadNumber(Of Integer)(
                         MaxValue:=Integer.MaxValue,
                         Mask:="."c,
                         CommentFormat:="[+] Introduce un valor {0} :",
                         IndicatorFormat:=" >> ",
                         DataTypeFormat:=New Dictionary(Of Type, String) From
                                         {
                                             {GetType(Integer),
                                              String.Format("entero (Int32 Max: {0})", CStr(Integer.MaxValue))}
                                         })
 
        Console.WriteLine(Environment.NewLine)
        Console.WriteLine(String.Format("Valor {0}: {1}", Num.GetType.Name, CStr(Num)))
        Console.ReadKey()
 
        Environment.Exit(0)
 
    End Sub
 
    ' By Elektro
    '
    ''' <summary>
    ''' Reads the console input to wait for an specific numeric value.
    ''' </summary>
    ''' <typeparam name="T"></typeparam>
    ''' <param name="MaxValue">Indicates the maximum value to expect.</param>
    ''' <param name="Mask">Indicates the character mask.</param>
    ''' <param name="CommentFormat">Indicates a comment string format.</param>
    ''' <param name="IndicatorFormat">Indicates a value indicator string format.</param>
    ''' <param name="DataTypeFormat">Indicates a data type string format.</param>
    Friend Function ReadNumber(Of T)(Optional ByVal MaxValue As Object = -0S,
                                     Optional ByVal Mask As Char = "",
                                     Optional ByVal CommentFormat As String = "",
                                     Optional ByVal IndicatorFormat As String = "",
                                     Optional ByVal DataTypeFormat As Dictionary(Of Type, String) = Nothing) As T
 
        ' A temporal string that stores the value.
        Dim TmpString As String = String.Empty
 
        ' Stores the current typed character.
        Dim CurrentKey As New ConsoleKeyInfo("", ConsoleKey.NoName, False, False, False)
 
        ' Retrieve the numeric object Type.
        Dim DataType As Type = GetType(T)
 
        ' Retrieve the Type name.
        Dim ValueFormat As String = DataType.Name
 
        ' Retrieve the Type converter.
        Dim Converter As System.ComponentModel.TypeConverter =
            System.ComponentModel.TypeDescriptor.GetConverter(DataType)
 
        ' Set the maximum number value.
        If Not CBool(MaxValue) Then
            MaxValue = DataType.GetField("MaxValue").GetValue(Nothing)
        End If
 
        ' Set the maximum number length.
        Dim MaxValueLength As Integer = CStr(MaxValue).Length
 
        ' Set the indicator length.
        Dim IndicatorLength As Integer = IndicatorFormat.Length
 
        ' Set the datatype name format.
        If DataTypeFormat IsNot Nothing Then
            ValueFormat = DataTypeFormat(DataType)
        End If
 
        ' Write the comment.
        If Not String.IsNullOrEmpty(CommentFormat) Then
            Console.WriteLine(String.Format(CommentFormat, ValueFormat))
            Console.WriteLine()
        End If
 
        ' Write the indicator.
        If Not String.IsNullOrEmpty(IndicatorFormat) Then
            Console.Write(IndicatorFormat)
        End If
 
        ' Write the value mask.
        For X As Integer = 0 To MaxValueLength - 1
            Console.Write(Mask)
        Next
 
        ' Set the cursor at the start of the mask.
        Console.SetCursorPosition(Console.CursorLeft - MaxValueLength, Console.CursorTop)
 
        ' Ready to parse characters!
        Do
 
            CurrentKey = Console.ReadKey(True)
 
            Select Case CurrentKey.Key
 
                Case ConsoleKey.Enter ' Accept the input.
                    Exit Do
 
                Case ConsoleKey.Backspace ' Delete the last written character.
 
                    If Not String.IsNullOrEmpty(TmpString) Then
                        Console.SetCursorPosition(Console.CursorLeft - 1, Console.CursorTop)
                        Console.Write(Mask)
                        Console.SetCursorPosition(Console.CursorLeft - 1, Console.CursorTop)
                        TmpString = TmpString.ToString.Substring(0, TmpString.ToString.Length - 1)
                    End If
 
                Case ConsoleKey.LeftArrow ' Move 1 cell to Left.
                    ' Not implemented yet (Too much work deleting character in the current cursor position).
                    ' Console.SetCursorPosition(Console.CursorLeft - 1, Console.CursorTop)
 
                Case ConsoleKey.RightArrow ' Move 1 cell to Right.
                    ' Not implemented yet (Too much work deleting character in the current cursor position).
                    ' Console.SetCursorPosition(Console.CursorLeft + 1, Console.CursorTop)
 
                Case Else ' Another key
 
                    Dim NextValue As String = If(Not String.IsNullOrEmpty(TmpString),
                                                 TmpString.ToString & CurrentKey.KeyChar,
                                                 CurrentKey.KeyChar)
 
                    ' If value is valid and also does not exceed the maximum value then...
                    If Converter.IsValid(NextValue) _
                        AndAlso Not NextValue > MaxValue _
                        AndAlso Not NextValue.Length > MaxValueLength Then
 
                        TmpString = NextValue
                        Console.Write(CurrentKey.KeyChar)
 
                    End If
 
            End Select
 
        Loop
 
        If Not String.IsNullOrEmpty(TmpString) Then ' Return the value.
            Return Converter.ConvertFromString(TmpString)
        Else
            Return Nothing
        End If
 
    End Function
 
End Module

using Microsoft.VisualBasic;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
static internal class Test
{
 
 
	static internal int Num = -0;
 
	static internal void Main()
	{
		Console.Title = "Introduciendo valores... By Elektro";
		Console.WriteLine();
 
		Num = ReadNumber<int>(MaxValue: int.MaxValue, Mask: '.', CommentFormat: "[+] Introduce un valor {0} :", IndicatorFormat: " >> ", DataTypeFormat: new Dictionary<Type, string> { {
			typeof(int),
			string.Format("entero (Int32 Max: {0})", Convert.ToString(int.MaxValue))
		} });
 
		Console.WriteLine(Environment.NewLine);
		Console.WriteLine(string.Format("Valor {0}: {1}", Num.GetType.Name, Convert.ToString(Num)));
		Console.ReadKey();
 
		Environment.Exit(0);
 
	}
 
	/// <summary>
	/// Reads the console input to wait for an specific numeric value.
	/// </summary>
	/// <typeparam name="T"></typeparam>
	/// <param name="MaxValue">Indicates the maximum value to expect.</param>
	/// <param name="Mask">Indicates the character mask.</param>
	/// <param name="CommentFormat">Indicates a comment string format.</param>
	/// <param name="IndicatorFormat">Indicates a value indicator string format.</param>
	/// <param name="DataTypeFormat">Indicates a data type string format.</param>
	static internal T ReadNumber<T>(object MaxValue = -0, char Mask = "", string CommentFormat = "", string IndicatorFormat = "", Dictionary<Type, string> DataTypeFormat = null)
	{
 
		// A temporal string that stores the value.
		string TmpString = string.Empty;
 
		// Stores the current typed character.
		ConsoleKeyInfo CurrentKey = new ConsoleKeyInfo("", ConsoleKey.NoName, false, false, false);
 
		// Retrieve the numeric object Type.
		Type DataType = typeof(T);
 
		// Retrieve the Type name.
		string ValueFormat = DataType.Name;
 
		// Retrieve the Type converter.
		System.ComponentModel.TypeConverter Converter = System.ComponentModel.TypeDescriptor.GetConverter(DataType);
 
		// Set the maximum number value.
		if (!Convert.ToBoolean(MaxValue)) {
			MaxValue = DataType.GetField("MaxValue").GetValue(null);
		}
 
		// Set the maximum number length.
		int MaxValueLength = Convert.ToString(MaxValue).Length;
 
		// Set the indicator length.
		int IndicatorLength = IndicatorFormat.Length;
 
		// Set the datatype name format.
		if (DataTypeFormat != null) {
			ValueFormat = DataTypeFormat(DataType);
		}
 
		// Write the comment.
		if (!string.IsNullOrEmpty(CommentFormat)) {
			Console.WriteLine(string.Format(CommentFormat, ValueFormat));
			Console.WriteLine();
		}
 
		// Write the indicator.
		if (!string.IsNullOrEmpty(IndicatorFormat)) {
			Console.Write(IndicatorFormat);
		}
 
		// Write the value mask.
		for (int X = 0; X <= MaxValueLength - 1; X++) {
			Console.Write(Mask);
		}
 
		// Set the cursor at the start of the mask.
		Console.SetCursorPosition(Console.CursorLeft - MaxValueLength, Console.CursorTop);
 
		// Ready to parse characters!
 
		do {
			CurrentKey = Console.ReadKey(true);
 
			switch (CurrentKey.Key) {
 
				case ConsoleKey.Enter:
					// Accept the input.
					break; // TODO: might not be correct. Was : Exit Do
 
 
					break;
				case ConsoleKey.Backspace:
					// Delete the last written character.
 
					if (!string.IsNullOrEmpty(TmpString)) {
						Console.SetCursorPosition(Console.CursorLeft - 1, Console.CursorTop);
						Console.Write(Mask);
						Console.SetCursorPosition(Console.CursorLeft - 1, Console.CursorTop);
						TmpString = TmpString.ToString.Substring(0, TmpString.ToString.Length - 1);
					}
 
					break;
				case ConsoleKey.LeftArrow:
					// Move 1 cell to Left.
					break;
				// Not implemented yet (Too much work deleting character in the current cursor position).
				// Console.SetCursorPosition(Console.CursorLeft - 1, Console.CursorTop)
 
				case ConsoleKey.RightArrow:
					// Move 1 cell to Right.
					break;
				// Not implemented yet (Too much work deleting character in the current cursor position).
				// Console.SetCursorPosition(Console.CursorLeft + 1, Console.CursorTop)
 
				default:
					// Another key
 
					string NextValue = !string.IsNullOrEmpty(TmpString) ? TmpString.ToString + CurrentKey.KeyChar : CurrentKey.KeyChar;
 
					// If value is valid and also does not exceed the maximum value then...
 
					if (Converter.IsValid(NextValue) && !(NextValue > MaxValue) && !(NextValue.Length > MaxValueLength)) {
						TmpString = NextValue;
						Console.Write(CurrentKey.KeyChar);
 
					}
 
					break;
			}
 
		} while (true);
 
		// Return the value.
		if (!string.IsNullOrEmpty(TmpString)) {
			return Converter.ConvertFromString(TmpString);
		} else {
			return null;
		}
 
	}
 
}
 
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