c# hex to bit conversion

I'm trying to convert the hexadecimal representation of a 64-bit number (eg, the string "FFFFFFFFF" ) to binary representation ( "11111..." ).

I've tried

string result = Convert.ToString(Convert.ToUInt64(value, 16), 2);

but this results in a confusing compiler error:

The best overloaded method match for 'System.Convert.ToString(object, System.IFormatProvider)' has some invalid arguments

Argument 2: cannot convert from 'int' to 'System.IFormatProvider'

---

There might be a better solution, but check if this works:

public static string HexToBinary(string hexValue)
{
    ulong number = UInt64.Parse(hexValue, System.Globalization.NumberStyles.HexNumber);

    byte[] bytes = BitConverter.GetBytes(number);

    string binaryString = string.Empty;
    foreach (byte singleByte in bytes)
    {
        binaryString += Convert.ToString(singleByte, 2);
    }

    return binaryString;
}

The most convenient way would be to use Convert.ToString(Int64, Int32) , but there is no overload for ulong. Another solution is Convert.ToString(UInt64, IFormatProvider) and write your own IFormatProvider. By looking at the examples I found an IFormatProvider that formats numbers in binary, octal and hex string representation: http://msdn.microsoft.com/en-us/library/system.icustomformatter.aspx. The code there looks very similar to what I provided, so I thinks its not a bad solution.

---

What's wrong with the following code?

string hex = "FFFFFFFFFFFFFFFF";

// Returns -1
long longValue = Convert.ToInt64(hex, 16);

// Returns 1111111111111111111111111111111111111111111111111111111111111111
string binRepresentation = Convert.ToString(longValue, 2);

Pretty much what you wrote (only fixed the ulong to long cast), and returns what you expect.

Edit: undeleted this answer, as even if the long representation is signed, the binary representation is actually what you expect.

---

最好的选择是：

public static string hex2bin(string value)
        {
            return Convert.ToString(Convert.ToInt32(value, 16), 2).PadLeft(value.Length * 4, '0');
        }

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