獲取字串中每個字元的十六進位制值。 
獲取與十六進位制字串中的每個值對應的字元。 
將十六進位制 string 轉換為整型。 
將十六進位制 string 轉換為浮點型。 
將位元組陣列轉換為十六進位制 string。

示例一:  輸出 string 中的每個字元的十六進位制值。

首先，它將 string 分析為字元陣列，然後對每個字元呼叫 ToInt32(Char) 以獲取相應的數字值。最後，在 string 中將數字的格式設定為十六進位制表示形式。

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 
*/

示例二:分析十六進位制值的 string 並輸出對應於每個十六進位制值的字元

首先，它呼叫 Split(array<Char>[]()[]) 方法以獲取每個十六進位制值作為陣列中的單個 string。然後呼叫 ToInt32(String, Int32) 以將十六進位制轉換為表示為 int 的十進位制值。示例中演示了用於獲取對應於該字元程式碼的字元的兩種不同方法。第一種方法是使用 ConvertFromUtf32(Int32)，它將對應於整型引數的字元作為 string 返回。第二種方法是將 int 顯式轉換為 char。

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 ! 
*/ 
示例三: 演示了將十六進位制 string 轉換為整數的另一種方法，即呼叫 Parse(String, NumberStyles) 方法。

string hexString = "8E2";
int num = Int32.Parse(hexString, System.Globalization.NumberStyles.HexNumber);
Console.WriteLine(num); 

//Output: 2274 
示例四:演示如何使用 System..::.BitConverter 類和 Int32..::.Parse 方法將十六進位制 string 轉換為浮點型。

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 
示例五:下面的示例演示如何使用 System..::.BitConverter 類將位元組陣列轉換為十六進位制字串。 
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上的盜版！

public string StrToHex(string mStr) //返回處理後的十六進位制字串
{
return BitConverter.ToString(
ASCIIEncoding.Default.GetBytes(mStr)).Replace("-", " ");
} /* StrToHex */
public string HexToStr(string mHex) // 返回十六進位制代表的字串
{
mHex = mHex.Replace(" ", "");
if (mHex.Length <= 0) return "";
byte[] vBytes = new byte[mHex.Length / 2];
for (int i = 0; i < mHex.Length; i += 2)
if (!byte.TryParse(mHex.Substring(i, 2), NumberStyles.HexNumber, null, out vBytes[i / 2]))
vBytes[i / 2] = 0;
return ASCIIEncoding.Default.GetString(vBytes);
} /* HexToStr */