在C#中,可以将整数转换为没有打字的未插入整数



是否可以将整数转换为未插入的整数,而无需明确打字?

我有以下代码 -

using System;
class MainClass
{
    public static void Main ()
    {
        int num1 = -33;
        uint num2 = Convert.ToUInt32 (num1);
        Console.WriteLine (num2);
    }
}

它给我带来了错误 -

System.OverFlowException已抛出。

值太大或太小,对于uint32

我不想使用显式打字。有可能吗?

这个问题不是一个问题的重复,如何将签名的整数转换为无签名的整数?正如我特别提到的那样,我想知道不使用显式打字吗?

我想知道是否可以不明确打字?

简短的答案是: nope

我想知道函数convert.touint32()

存在的原因

答案:微软的某人发现它有帮助并创建了。其他人则发现它有用/易于使用并使用。我想我们找不到实施该功能的具体原因。

有关此主题的更多信息:

此答案指出了4种可能性。它们每个都包含一个类型。我不知道将UINT转换为INT的另一个内置功能。答案很好地解释了uint-> int的转换和陷阱。

(Ultrashort)摘要:您必须照顾溢出

处理未签名类型时,您应该查看检查和未选中的关键字。

typeConversion

取决于这4种打字方法。

  • 隐式
  • 显式
  • 使用转换Oerator的用户定义的转换。
  • 与Helüer课程的转换(如转换类)

convert.toint32()/convert.touint32()

的用户酶

toint32()的codeSample取自MSDN。

float[] values= { Single.MinValue, -1.38e10f, -1023.299f, -12.98f,
                  0f, 9.113e-16f, 103.919f, 17834.191f, Single.MaxValue };
int result;
foreach (float value in values)
{
   try {
      result = Convert.ToInt32(value);
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                        value.GetType().Name, value, result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("{0} is outside the range of the Int32 type.", value);
   }   
}                                 
// The example displays the following output:
//    -3.40282346638529E+38 is outside the range of the Int32 type.
//    -13799999488 is outside the range of the Int32 type.
//    Converted the Double value -1023.29901123047 to the Int32 value -1023.
//    Converted the Double value -12.9799995422363 to the Int32 value -13.
//    Converted the Double value 0 to the Int32 value 0.
//    Converted the Double value 9.11299983940444E-16 to the Int32 value 0.
//    Converted the Double value 103.918998718262 to the Int32 value 104.
//    Converted the Double value 17834.19140625 to the Int32 value 17834.
//    3.40282346638529E+38 is outside the range of the Int32 type.

转换的代码样本。 touint(int32)也取自MSDN

int[] numbers = { Int32.MinValue, -1203, 0, 121, 1340, Int32.MaxValue };
uint result;
foreach (int number in numbers)
{
   try {
      result = Convert.ToUInt32(number);
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                        number.GetType().Name, number,
                        result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("The {0} value {1} is outside the range of the UInt32 type.",
                        number.GetType().Name, number);
   }
}
// The example displays the following output:
//    The Int32 value -2147483648 is outside the range of the UInt32 type.
//    The Int32 value -1203 is outside the range of the UInt32 type.
//    Converted the Int32 value 0 to the UInt32 value 0.
//    Converted the Int32 value 121 to the UInt32 value 121.
//    Converted the Int32 value 1340 to the UInt32 value 1340.
//    Converted the Int32 value 2147483647 to the UInt32 value 2147483647.

作为OP注释的请求:

//Sample inputs
string str = "15";
bool b = false;
int i = 15;
double d = 14.5;
object o = str;
object oi = i;
//These are not valid
//uint ustr = (uint)str; 
//uint ub = (uint)b;
//This is valid at compile time but throw a run time exception
//uint uo = (uint)o;
//uint uoi = (uint)oi;
//These are valid
uint ustr = Convert.ToUInt32(str);
uint ub = Convert.ToUInt32(b);
uint uo = Convert.ToUInt32(o);
uint uoi2 = Convert.ToUInt32(oi);
//both ways are valid
uint ud = (uint)d;
uint ud2 = Convert.ToUInt32(d);
uint ui = (uint)i;
uint ui2 = Convert.ToUInt32(i);
//Some inputs can't be converted by either way (casting may be possible but result in wrong values)
string str2 = "Bananas";
int i2 = -15;

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