TextBox不应仅接受数值和特殊字符.它可以接受字母数字值 [英] TextBox should not accept only numeric values and only special characters. It can accept alpha-numeric values

问题描述

TextBox不应仅接受数值和特殊字符.它可以接受字母数字值和字母.
请给我适当的ValidationExpression.

谢谢与问候，
Yogesh Sharma

Hi,
TextBox should not accept only numeric values and only special characters. It can accept alpha-numeric values and alphabets.
Please give me proper ValidationExpression.

Thanks & Regards,
Yogesh Sharma

推荐答案

StringBuilder newval = new StringBuilder();

foreach (char i in textbox1.Text)
{
    if (char.IsLetterOrDigit(i))
    {
        newval.Append(i);
    }
}
textbox1.Text = newval.GetString();

这应该在textbox的textchanged事件上完成.

并在textbox1_keyPress事件上

This should be done on textchanged event of textbox.

and on textbox1_keyPress event

if(!char.IsLetterOrDigit(textbox1.text)
{
    e.handled= true;
}

此代码对您很有用.将代码放在一次cs文件中，然后将功能应用于文本框.

This code is usefull to you.place the code in once cs file and apply the functions to textbox.

public static bool IsNaturalNumber(string strNumber)
       {
           Regex objNotNaturalPattern = new Regex("[^0-9]");
           Regex objNaturalPattern = new Regex("0*[1-9][0-9]*");
           return !objNotNaturalPattern.IsMatch(strNumber) &&
           objNaturalPattern.IsMatch(strNumber);
       }

       // Function to test for Positive Integers with zero inclusive
       public static bool IsWholeNumber(String strNumber)
       {
           Regex objNotWholePattern = new Regex("[^0-9]");
           return !objNotWholePattern.IsMatch(strNumber);
       }
       // Function to Test for Integers both Positive & Negative
       public static  bool IsInteger(String strNumber)
       {
           Regex objNotIntPattern = new Regex("[^0-9-]");
           Regex objIntPattern = new Regex("^-[0-9]+

| ^ [0-9] +

|^[0-9]+

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