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                # 如何:在十六進制字符串與數值類型之間轉換(C# 編程指南) 以下示例演示如何執行下列任務: * 獲取[字符串](https://msdn.microsoft.com/zh-CN/library/362314fe.aspx)中每個字符的十六進制值。 * 獲取與十六進制字符串中的每個值對應的[字符](https://msdn.microsoft.com/zh-CN/library/x9h8tsay.aspx)。 * 將十六進制 **string** 轉換為[整型](https://msdn.microsoft.com/zh-CN/library/5kzh1b5w.aspx)。 * 將十六進制 **string** 轉換為[浮點型](https://msdn.microsoft.com/zh-CN/library/b1e65aza.aspx)。 * 將[字節](https://msdn.microsoft.com/zh-CN/library/5bdb6693.aspx)數組轉換為十六進制 **string**。 此示例輸出 **string** 中的每個字符的十六進制值。首先,它將 **string** 分析為字符數組,然后對每個字符調用 [ToInt32(Char)](https://msdn.microsoft.com/zh-CN/library/ww9t2871.aspx) 以獲取相應的數字值。最后,在 **string** 中將數字的格式設置為十六進制表示形式。 ``` 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 */ ``` 此示例分析十六進制值的 **string** 并輸出對應于每個十六進制值的字符。首先,它調用 [Split(Char[])](https://msdn.microsoft.com/zh-CN/library/b873y76a.aspx) 方法以獲取每個十六進制值作為數組中的單個 **string**。然后調用 [ToInt32(String,?Int32)](https://msdn.microsoft.com/zh-CN/library/1k20k614.aspx) 以將十六進制轉換為表示為 [int](https://msdn.microsoft.com/zh-CN/library/5kzh1b5w.aspx) 的十進制值。示例中演示了用于獲取對應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)](https://msdn.microsoft.com/zh-CN/library/system.char.convertfromutf32.aspx),它將對應于整型參數的字符作為 **string** 返回。第二種方法是將 **int** 顯式轉換為 [char](https://msdn.microsoft.com/zh-CN/library/x9h8tsay.aspx)。 ``` 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制 **string** 轉換為整數的另一種方法,即調用 [Parse(String,?NumberStyles)](https://msdn.microsoft.com/zh-CN/library/c09yxbyt.aspx) 方法。 ``` 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](https://msdn.microsoft.com/zh-CN/library/system.bitconverter.aspx) 類和 [Int32.Parse](https://msdn.microsoft.com/zh-CN/library/system.int32.parse.aspx) 方法將十六進制 **string** 轉換為[浮點型](https://msdn.microsoft.com/zh-CN/library/b1e65aza.aspx)。 ``` 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](https://msdn.microsoft.com/zh-CN/library/system.bitconverter.aspx) 類將[字節](https://msdn.microsoft.com/zh-CN/library/5bdb6693.aspx)數組轉換為十六進制字符串。 ``` 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 */ ``` ## 請參閱 [標準數字格式字符串](https://msdn.microsoft.com/zh-CN/library/dwhawy9k.aspx) [類型(C# 編程指南)](https://msdn.microsoft.com/zh-CN/library/ms173104.aspx) [如何:確定字符串是否表示數值(C# 編程指南)](https://msdn.microsoft.com/zh-CN/library/bb384043.aspx)
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