多种减轻方案,决断二个string是或不是为数字

方案一:Try…Catch(试行作用不高State of Qatar
///
/// 名称:IsNumberic
/// 成效:判定输入的是或不是是数字
/// 参数:string oText:源文本
/// 返回值: bool true:是 false:否
///
///
///
private bool IsNumberic(string oText)
{
try
         {
int var1=Convert.ToInt32 (oText,’,’,’);
return true;
         }
catch
{
return false;
}
}

案一:Try…Catch(试行成效不高卡塔尔(قطر‎
private bool IsNumberic(string oText)
{
          try
         {
                  int var1=Convert.ToInt32 (oText);
                  return true;
         }
          catch
         {
                  return false;
         }
}

方案二:正则表达式(推荐卡塔尔国
a)
using System;
using System.Text.RegularExpressions;

 

public bool IsNumber(String strNumber)
{
Regex objNotNumberPattern=new Regex(“[^0-9.-]”,’,’,’);
Regex objTwoDotPattern=new
Regex(“[0-9]*[.][0-9]*[.][0-9]*”,’,’,’);
Regex objTwoMinusPattern=new
Regex(“[0-9]*[-][0-9]*[-][0-9]*”,’,’,’);
String
strValidRealPattern=”^([-]|[.]|[-.]|[0-9])[0-9]*[.]*[0-9]+$”;
String strValidIntegerPattern=”^([-]|[0-9])[0-9]*$”;
Regex objNumberPattern =new Regex(“(” + strValidRealPattern +”)|(” +
strValidIntegerPattern + “)”,’,’,’);

方案二:正则表明式(推荐卡塔尔国
a)
public static bool IsNumeric(string value)
{
         return Regex.IsMatch(value, @”^[+-]?d*[.]?d*$”);
}
public static bool IsInt(string value)
{
         return Regex.IsMatch(value, @”^[+-]?d*$”);
}
public static bool IsUnsign(string value)
{
         return Regex.IsMatch(value, @”^d*[.]?d*$”);
}

return !objNotNumberPattern.IsMatch(strNumber) &&
!objTwoDotPattern.IsMatch(strNumber) &&
!objTwoMinusPattern.IsMatch(strNumber) &&
objNumberPattern.IsMatch(strNumber,’,’,’);
}

 public static bool isTel(string strInput)
{
        return Regex.IsMatch(strInput,
@”d{3}-d{8}|d{4}-d{7}”);
}

b)
public static bool IsNumeric(string value)
{
return Regex.IsMatch(value, @”^[+-]?d*[.]?d*$”,’,’,’);
}
public static bool IsInt(string value)
{
return Regex.IsMatch(value, @”^[+-]?d*$”,’,’,’);
}
public static bool IsUnsign(string value)
{
return Regex.IsMatch(value, @”^d*[.]?d*$”,’,’,’);
}
方案三:遍历
a)
public bool isnumeric(string str)
{
    char[] ch=new char[str.Length];
    ch=str.ToCharArray(,’,’,’);
    for(int i=0;i    {
        if(ch[i]<48 || ch[i]>57)
            return false;
    }
    return true;
}

b)

b)
public bool IsInteger(string strIn) {
bool bolResult=true;
if(strIn==””) {
bolResult=false;
}
else {
foreach(char Char in strIn) {
if(char.IsNumber(Char))
continue;
else {
bolResult=false;
break;
}
}
}
return bolResult;
}

using System;
using System.Text.RegularExpressions;

c)
public static bool isNumeric(string inString)
{
inString=inString.Trim(,’,’,’);
bool haveNumber=false;
bool haveDot=false;
for(int i=0;i{
if (Char.IsNumber(inString[i]))
{
haveNumber=true;
}
else if(inString[i]==’.’)
{
if (haveDot)
{
return false;
}
else
{
haveDot=true;
}
}
else if(i==0)
{
if(inString[i]!=’+’&&inString[i]!=’-‘)
{
return false;
}
}
else
{
return false;
}
if(i>20)
{
return false;
}
}
return haveNumber;
}
}

public bool IsNumber(String strNumber)
{
           Regex objNotNumberPattern=new Regex(“[^0-9.-]”);
           Regex objTwoDotPattern=new
Regex(“[0-9]*[.][0-9]*[.][0-9]*”);
           Regex objTwoMinusPattern=new
Regex(“[0-9]*[-][0-9]*[-][0-9]*”);
           String
strValidRealPattern=”^([-]|[.]|[-.]|[0-9])[0-9]*[.]*[0-9]+$”;
           String strValidIntegerPattern=”^([-]|[0-9])[0-9]*$”;
           Regex objNumberPattern =new Regex(“(” + strValidRealPattern
+”)|(” + strValidIntegerPattern + “)”);

方案四:改写vb的IsNumeric源代码(执行功能不高卡塔尔

           return !objNotNumberPattern.IsMatch(strNumber) &&
                  !objTwoDotPattern.IsMatch(strNumber) &&
                  !objTwoMinusPattern.IsMatch(strNumber) &&
                  objNumberPattern.IsMatch(strNumber);
}

//主调函数
public static bool IsNumeric(object Expression)
{
      bool flag1;
      IConvertible convertible1 = null;
      if (Expression is IConvertible)
      {
            convertible1 = (IConvertible) Expression;
      }
      if (convertible1 == null)
      {
            if (Expression is char[])
            {
                  Expression = new string((char[])
Expression,’,’,’);
            }
            else
            {
                  return false;
            }
      }
      TypeCode code1 = convertible1.GetTypeCode(,’,’,’);
      if ((code1 != TypeCode.String) && (code1 != TypeCode.Char))
      {
            return Utils.IsNumericTypeCode(code1,’,’,’);
      }
      string text1 = convertible1.ToString(null,’,’,’);
      try
      {
            long num2;
            if (!StringType.IsHexOrOctValue(text1, ref num2))
            {
                  double num1;
                  return DoubleType.TryParse(text1, ref num1,’,’,’);
            }
            flag1 = true;
      }
      catch (Exception)
      {
            flag1 = false;
      }
      return flag1;
}

 

//子函数
// return Utils.IsNumericTypeCode(code1,’,’,’);
internal static bool IsNumericTypeCode(TypeCode TypCode)
{
      switch (TypCode)
      {
            case TypeCode.Boolean:
            case TypeCode.Byte:
            case TypeCode.Int16:
            case TypeCode.Int32:
            case TypeCode.Int64:
            case TypeCode.Single:
            case TypeCode.Double:
            case TypeCode.Decimal:
            {
                  return true;
            }
            case TypeCode.Char:
            case TypeCode.SByte:
            case TypeCode.UInt16:
            case TypeCode.UInt32:
            case TypeCode.UInt64:
            {
                  break;
            }
      }
      return false;
}
 

方案三:遍历
a)
public bool isnumeric(string str)
{
    char[] ch=new char[str.Length];
    ch=str.ToCharArray();
    for(int i=0;i    {
        if(ch[i]<48 || ch[i]>57)
            return false;
    }
    return true;
}

//—————–
//StringType.IsHexOrOctValue(text1, ref num2))
internal static bool IsHexOrOctValue(string Value, ref long i64Value)
{
      int num1;
      int num2 = Value.Length;
      while (num1 < num2)
      {
            char ch1 = Value[num1];
            if (ch1 == ‘&’)
            {
                  ch1 = char.ToLower(Value[num1 + 1],
CultureInfo.InvariantCulture,’,’,’);
                  string text1 =
StringType.ToHalfwidthNumbers(Value.Substring(num1 + 2),’,’,’);
                  if (ch1 == ‘h’)
                  {
                        i64Value = Convert.ToInt64(text1, 0x10,’,’,’);
                  }
                  else if (ch1 == ‘o’)
永利澳门游戏网址304,                  {
                        i64Value = Convert.ToInt64(text1, 8,’,’,’);
                  }
                  else
                  {
                        throw new FormatException(,’,’,’);
                  }
                  return true;
            }
            if ((ch1 != ‘ ‘) && (ch1 != ‘u3000’))
            {
                  return false;
            }
            num1++;
      }
      return false;
}
//—————————————————-
// DoubleType.TryParse(text1, ref num1,’,’,’);
internal static bool TryParse(string Value, ref double Result)
{
      bool flag1;
      CultureInfo info1 = Utils.GetCultureInfo(,’,’,’);
      NumberFormatInfo info3 = info1.NumberFormat;
      NumberFormatInfo info2 =
DecimalType.GetNormalizedNumberFormat(info3,’,’,’);
      Value = StringType.ToHalfwidthNumbers(Value, info1,’,’,’);
      if (info3 == info2)
      {
            return double.TryParse(Value, NumberStyles.Any, info2, out
Result,’,’,’);
      }
      try
      {
            Result = double.Parse(Value, NumberStyles.Any,
info2,’,’,’);
            flag1 = true;
      }
      catch (FormatException)
      {
            flag1 = double.TryParse(Value, NumberStyles.Any, info3, out
Result,’,’,’);
      }
      catch (Exception)
      {
            flag1 = false;
      }
      return flag1;
}

 

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