十六进制字符串与数值类型之间转换（C# 编程指南）
以下示例演示如何执行下列任务：
示例
此示例输出 string 中的每个字符的十六进制值。首先，它将 string 分析为字符数组，然后对每个字符调用ToInt32(Char) 以获取相应的数字值。最后，在 string 中将数字的格式设置为十六进制表示形式。
C#
string input = "Hello World!"; char[] values = input.ToCharArray(); foreach (char letter invalues) { // Get the integral value of the character. int value = Convert.ToInt32(letter); // Convert the decimal value to a hexadecimal value in string form. string hexOutput = String.Format("{0:X}", value); Console.WriteLine("Hexadecimal value of {0} is {1}", letter, hexOutput); } /* Output: Hexadecimal value of H is 48 Hexadecimal value of e is 65 Hexadecimal value of l is 6C Hexadecimal value of l is 6C Hexadecimal value of o is 6F Hexadecimal value of is 20 Hexadecimal value of W is 57 Hexadecimal value of o is 6F Hexadecimal value of r is 72 Hexadecimal value of l is 6C Hexadecimal value of d is 64 Hexadecimal value of ! is 21 */
此示例分析十六进制值的 string 并输出对应于每个十六进制值的字符。首先，它调用 Split(array<Char>[]()[])方法以获取每个十六进制值作为数组中的单个 string。然后调用 ToInt32(String, Int32) 以将十六进制转换为表示为 int 的十进制值。示例中演示了用于获取对应于该字符代码的字符的两种不同方法。第一种方法是使用ConvertFromUtf32(Int32)，它将对应于整型参数的字符作为 string 返回。第二种方法是将 int 显式转换为char。
C#
string hexValues = "48 65 6C 6C 6F 20 57 6F 72 6C 64 21"; string[] hexValuesSplit = hexValues.Split(' '); foreach (String hex in hexValuesSplit) { // Convert the number expressed in base-16 to an integer. int value = Convert.ToInt32(hex, 16); // Get the character corresponding to the integral value. string stringValue = Char.ConvertFromUtf32(value); charcharValue = (char)value; Console.WriteLine("hexadecimal value = {0}, int value = {1}, char value = {2} or {3}", hex, value, stringValue, charValue); } /* Output: hexadecimal value = 48, intvalue = 72, char value = H or H hexadecimal value = 65, int value = 101, char value = e or e hexadecimal value = 6C, int value = 108, char value = l or l hexadecimal value = 6C, int value = 108, char value = l or l hexadecimal value = 6F, int value = 111, char value = o or o hexadecimal value = 20, int value = 32, char value = or hexadecimal value = 57, int value = 87,char value = W or W hexadecimal value = 6F, int value = 111, char value = o or o hexadecimal value = 72, int value = 114, char value = r or r hexadecimal value = 6C, int value = 108, charvalue = l or l hexadecimal value = 64, int value = 100, char value = d or d hexadecimal value = 21, int value = 33, char value = ! or ! */
此示例演示了将十六进制 string 转换为整数的另一种方法，即调用 Parse(String, NumberStyles) 方法。
C#
string hexString = "8E2"; int num = Int32.Parse(hexString, System.Globalization.NumberStyles.HexNumber); Console.WriteLine(num); //Output: 2274
下面的示例演示如何使用 System..::.BitConverter 类和 Int32..::.Parse 方法将十六进制 string 转换为浮点型。
C#
string hexString = "43480170"; uint num = uint.Parse(hexString, System.Globalization.NumberStyles.AllowHexSpecifier); byte[] floatVals = BitConverter.GetBytes(num); float f = BitConverter.ToSingle(floatVals, 0); Console.WriteLine("float convert = {0}", f); // Output: 200.0056
下面的示例演示如何使用 System..::.BitConverter 类将字节数组转换为十六进制字符串。
C#
byte[] vals = { 0x01, 0xAA, 0xB1, 0xDC, 0x10, 0xDD }; string str = BitConverter.ToString(vals); Console.WriteLine(str); str = BitConverter.ToString(vals).Replace("-", ""); Console.WriteLine(str); /*Output: 01-AA-B1-DC-10-DD 01AAB1DC10DD */只是msdn上的盗版！
yuan:http://msdn.microsoft.com/zh-cn/library/bb311038.aspx