[C#] 數字(string)和數值(value)之間的轉換

●值(value)轉16進位字串(string) 

private void btn1_Click(object sender, EventArgs e)
{
   int value = 10;
   textBox2.Text = Convert.ToString(value, 16);
}

●值(Value)轉16進位字串(string) - 在前面補0

private void btn1_Click(object sender, EventArgs e)
{
   int value = 10;
   textBox2.Text = value.ToString("X2");
}

●值(Value)轉16進位字串(string) - 在前面補0x 

private void btn1_Click(object sender, EventArgs e)
{
   int value = 10;
   textBox2.Text = String.Format("0x{0:X2}", value);
}

補充說明:多個value用法及不同格式

textBox2.Text = String.Format("0x{0:X2}, 0x{1:X2}, 0x{2:0.00%}", value0, value1, (float)value1/value2);

X: 格式,十六進位
D: 格式,十進位
E: 科學記號
N: 用分號隔開

2: 顯示兩位數寬度,若不足,會補0

●byte陣列轉成字串

private void btn1_Click(object sender, EventArgs e)
{
   byte[] bBuff = {0x41, 0x42, 0x43, 0x44};  //範例是轉換0x42,0x43
   textBox2.Text = Encoding.ASCII.GetString(bBuff, 2, 2);
}

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●16進位字串(String)轉成值(Value)

private void btn1_Click(object sender, EventArgs e)
{

   int value;
   string String = "0A";

   /*Convert string to value*/
   value = Convert.ToByte(String, 16);

   /*Display value converted to string*/
   textBox2.Text = Convert.ToString(value);
}

●16進位字串(Hex string)轉成位元組陣列Byte[]

string hexString = richTextBox1.Text;

byte[] data = new byte[hexString.Length / 2];

for (int i = 0; i < data.Length; i++)
{
    string byteValue = hexString.Substring(i * 2, 2);

    /*Check input data*/
    data[i] = byte.Parse(byteValue, NumberStyles.HexNumber);
}

●string轉成Byte

byte b;

s = "1";
b = Convert.ToByte(s);

// b = 0x01;

C# String.Format用法和格式说明