c# - 格式异常 : Could not find any recognizable digits

Question

我得到这个异常:

A first chance exception of type 'System.FormatException' occurred in mscorlib.dll

在这一行:

String value = "2";
uint? test = Convert.ToUInt32(value, 2);

Answer 1

那是因为你的第二个参数将基数设置为 2，而 2 不是二进制的有效数字。

来自 MSDN

The call to public static uint ToUInt32(string value, int fromBase) will throw a FormatException when value contains a character that is not a valid digit in the base specified by fromBase. The exception message indicates that there are no digits to convert if the first character in value is invalid; otherwise, the message indicates that value contains invalid trailing characters.