驗證輸入textbox的值是否為數字

判斷值是否為數字,此方法驗證字串中的每個字元，如果是數字，繼續，如不是，返回false

public bool IsInteger(string strIn)<br />{<br />bool bolResult=true;<br />if(strIn=="")<br />{<br />bolResult=false;<br />}<br />else<br />{<br />foreach(char Char in strIn)<br />{<br />if(char.IsNumber(Char))<br />continue;<br />else<br />{<br />bolResult=false;<br />break;<br />}<br />}<br />}<br />return bolResult;<br />}<br />

 

2. vb版

Public Class DataCheck<br /> '驗證數字輸入<br /> Public Shared Function Check(ByVal checkObject As String) As Integer<br /> Dim result As Integer = 0<br /> Dim strLen As Integer = checkObject.Length<br /> Dim i As Integer<br /> Dim baseStr As String<br /> baseStr = "0123456789"<br /> For i = 0 To strLen - 1<br /> If baseStr.IndexOf(checkObject.Substring(i, 1)) = -1 Then<br /> result = -1<br /> Exit For<br /> Else<br /> result = baseStr.IndexOf(checkObject.Substring(i, 1))<br /> End If<br /> Next<br /> Return result<br /> End Function

 

3 綜合（借鑒）

public static class Common<br /> {<br /> //isDigit<br /> public static bool isNumberic1(this string _string)<br /> {<br /> if (string.IsNullOrEmpty(_string))<br /> return false;<br /> foreach (char c in _string)<br /> {<br /> if (!char.IsDigit(c))<br /> return false;<br /> }<br /> return true;<br /> }</p><p> //vb isnumberic<br /> public static bool isNumberic2(this string _string)<br /> {<br /> return !string.IsNullOrEmpty(_string) && Microsoft.VisualBasic.Information.IsNumeric(_string);<br /> }<br /> //try parese<br /> public static bool isNumberic3(this string _string)<br /> {<br /> if (string.IsNullOrEmpty(_string))<br /> return false;<br /> int i = 0;<br /> return int.TryParse(_string, out i);<br /> }</p><p> //try catch<br /> public static bool isNumberic4(this string _string)<br /> {<br /> if (string.IsNullOrEmpty(_string))<br /> return false;<br /> int i = 0;<br /> try { int.Parse(_string); }<br /> catch { return false; }<br /> return true;<br /> }<br /> //regex<br /> public static bool isNumberic5(this string _string)<br /> {<br /> return !string.IsNullOrEmpty(_string) && Regex.IsMatch(_string, "^//d+$");<br /> }<br /> }