Asp.net check whether the verification string is a pure numeric method summary

In asp.net, we verify whether the string is a number. We don't use as many rich functions as php. Here I have sorted out some examples to verify whether the string is a pure numeric method code.

Example 1

The Code is as follows:	Copy code
# Region's method of determining whether a number is used Public bool isnumeric (string str) { Char [] ch = new char [str. Length]; Ch = str. ToCharArray (); For (int I = 0; I <ch. Length; I ++) { If (ch [I] <48 | ch [I]> 57) Return false; } Return true; } # Endregion

Example 2

The Code is as follows:

Copy code

Class IsNumeric { // Determine whether the string is a pure number Public static bool IsNumber (string str) { If (str = null | str. Length = 0) // verify whether this parameter is null. Return false; // Yes, False is returned. ASCIIEncoding ascii = new ASCIIEncoding (); // instance of new ASCIIEncoding Byte [] bytestr = ascii. GetBytes (str); // Save the string type parameter to the array Foreach (byte c in bytestr) // traverses the content in this array { If (c <48 | c> 57) // determines whether it is a number. { Return false; // No, False is returned. } } Return true; // Yes, True is returned. } }

The above two instances are simple: Get the character type and traverse it to determine if it is a number.