int
-2,147,483,648 到 2,147,483,647
int16
-32768 到 32767
int32
-2,147,483,648 到 2,147,483,647
int = int32
在C#中：
int <==> System.Int32
short <==> System.Int16
long <==> System.Int64
int、int.Parse()、Convert.ToInt32()區別...
直到自己親自測試了才對他們有所了解，以前就知道用最后面那個，因為怕轉化出錯，所以就用它比較安全。
1.int ：(int)變量，C#默認整型為int32；(不支持bool轉化)
2.int.Parse(string sParameter) 4個構造函數，參數類型只支持string類型；
3.Convert.ToInt32()支持的類型是object；
事例：
using System;
using System.Collections.Generic;
using System.Text;
namespace IntegerSample
{
public class Program
{
private enum eNumber { Man = 1,
Woman = 2 };
private static char cNumber = 'e';
private static byte btNumber = 12;
private static long lNumber = 12345;
private static double dNumber =
12.34d;
private static decimal dlNumber =
4.5m;
private static bool bNumber = true;
private static string str = null;
private static string str1 =
"";
private static string str2 =
"123";
private static string str3 =
"Hello";
public static void TransformByInt()
{
Console.WriteLine("{0} TransformByInt Into {1}", eNumber.Man,
(int)eNumber.Man);
Console.WriteLine("{0} TransformByInt Into {1}", cNumber,
(int)cNumber);
Console.WriteLine("{0} TransformByInt Into {1}", btNumber,
(int)btNumber);
Console.WriteLine("{0} TransformByInt Into {1}", lNumber,
(int)lNumber);
Console.WriteLine("{0} TransformByInt Into {1}", dNumber,
(int)dNumber);
Console.WriteLine("{0} TransformByInt Into {1}", dlNumber,
(int)dlNumber);
//Console.WriteLine("{0} TransformByInt Into {1}", bNumber,
(int)bNumber);
//Console.WriteLine("{0}
TransformByInt Into {1}", str1, (int)str);
}
// Result: 1
// Result：101
// Result: 12
// Result: 12345
// Result: 12
// Result: 4
// 無法將類型“bool”轉換為“int”
// 編譯錯誤，不能將string轉化為int
public static void TransformByIntParse()
{
try
{
Console.WriteLine("str {0}:", int.Parse(str));
Console.WriteLine("str1 {0}:", int.Parse(str1));
Console.WriteLine("str2 {0}:", int.Parse(str2));
Console.WriteLine("str3 {0}:", int.Parse(str3));
}
catch
(Exception ex)
{
Console.WriteLine(ex.Message.ToString());
}
}
// 值不能為空。
// 輸入字符串的格式不正確。
// Result: 123
// 輸入字符串的格式不正確。
public static void TransformByConvert()
{
try
{
Console.WriteLine("{0}", Convert.ToInt32(str));
Console.WriteLine("{0}", Convert.ToInt32(str1));
Console.WriteLine("{0}", Convert.ToInt32(str2));
Console.WriteLine("{0}", Convert.ToInt32(str3));
}
catch
(Exception ex)
{
Console.WriteLine(ex.Message.ToString());
}
}
// Result: 0
// 輸入字符串的格式不正確。
// Result: 123
// 輸入字符串的格式不正確。
public static void Main(string[] args)
{
TransformByInt();
TransformByIntParse();
TransformByConvert();
}
}
}
ps：C#不會對數據進行四舍五入，只會截取。