十六進(jìn)制字符串與數(shù)值類型之間轉(zhuǎn)換（C# 編程指南） 
以下示例演示如何執(zhí)行下列任務(wù)： 
獲取字符串中每個(gè)字符的十六進(jìn)制值。 
獲取與十六進(jìn)制字符串中的每個(gè)值對(duì)應(yīng)的字符。 
將十六進(jìn)制 string 轉(zhuǎn)換為整型。 
將十六進(jìn)制 string 轉(zhuǎn)換為浮點(diǎn)型。 
將字節(jié)數(shù)組轉(zhuǎn)換為十六進(jìn)制 string。 
示例 
此示例輸出 string 中的每個(gè)字符的十六進(jìn)制值。首先，它將 string 分析為字符數(shù)組，然后對(duì)每個(gè)字符調(diào)用 ToInt32(Char) 以獲取相應(yīng)的數(shù)字值。最后，在 string 中將數(shù)字的格式設(shè)置為十六進(jìn)制表示形式。 
C# 
string input = "Hello World!"; 
char[] values = input.ToCharArray(); 
foreach (char letter in values) 
{ 
// 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 
*/ 
此示例分析十六進(jìn)制值的 string 并輸出對(duì)應(yīng)于每個(gè)十六進(jìn)制值的字符。首先，它調(diào)用 Split(array<Char>[]()[]) 方法以獲取每個(gè)十六進(jìn)制值作為數(shù)組中的單個(gè) string。然后調(diào)用 ToInt32(String, Int32) 以將十六進(jìn)制轉(zhuǎn)換為表示為 int 的十進(jìn)制值。示例中演示了用于獲取對(duì)應(yīng)于該字符代碼的字符的兩種不同方法。第一種方法是使用 ConvertFromUtf32(Int32)，它將對(duì)應(yīng)于整型參數(shù)的字符作為 string 返回。第二種方法是將 int 顯式轉(zhuǎn)換為 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); 
char charValue = (char)value; 
Console.WriteLine("hexadecimal value = {0}, int value = {1}, char value = {2} or {3}", 
hex, value, stringValue, charValue); 
} 
/* Output: 
hexadecimal value = 48, int value = 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, char value = l or l 
hexadecimal value = 64, int value = 100, char value = d or d 
hexadecimal value = 21, int value = 33, char value = ! or ! 
*/ 
此示例演示了將十六進(jìn)制 string 轉(zhuǎn)換為整數(shù)的另一種方法，即調(diào)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 類和 Int32..::.Parse 方法將十六進(jìn)制 string 轉(zhuǎn)換為浮點(diǎn)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 類將字節(jié)數(shù)組轉(zhuǎn)換為十六進(jìn)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 
*/ 
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