UInt32.TryParse（）十六进制数不起作用

Question

由于某种原因，以下C＃控制台程序始终输出：

  

32
  假
  WTF = 0

我做错了什么？

using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Globalization;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(Convert.ToUInt32("0x20", 16));
            UInt32 wtf = 0;
            Console.WriteLine(UInt32.TryParse("0x20",
                              NumberStyles.HexNumber, // I've tried also AllowHexSpecifier
                              CultureInfo.InvariantCulture,  // I've also tried CurrentCulture
                              out wtf));
            Console.WriteLine("wtf={0}", wtf);
        }
    }
}

Answer 1

您需要删除“0x”前缀。请参阅this blog entry

Answer 2

// stupid but effective way to improve the parsing
char[] _trim_hex = new char[] {'0','x'};
int temp;

if (int.TryParse(value.TrimStart(_trim_hex), NumberStyles.HexNumber, null, out temp))
{
    // temp is good
}

Answer 3

摆脱你想要解析的字符串中的前导“0x”。

Answer 4

另见http://msdn.microsoft.com/en-us/library/kadka85s%28v=VS.100%29.aspx 在页面底部的示例中：

  

尝试转换'0x8F8C'失败。