①, data Format validation control (RegularExpressionValidator)
Copy Code code as follows:
<asp:regularexpressionvalidator id= "RegularExpressionValidator1" runat= "Server" errormessage= "This username has already been registered" ControlToValidate = "Txtname" validationexpression = "\s+@\s+\.\s+" ></asp:RegularExpressionValidator>
A pattern match is made to the control you want to validate by customizing the regular expression.
Take the previous piece of code for example:
The ErrorMessage attribute indicates that the error message occurs when the validation is not valid;
The ControlToValidate property represents the ID of the control that needs to be validated;
The ValidationExpression property is specified as a regular expression of the validation condition;
Paste the common regular expression characters and their meanings here:
Copy Code code as follows:
Number Regular expression character meaning
1 [...] matches any one of the characters in parentheses
2 [^ ...] matches any one character not in parentheses
3 \w matches any one character (A~z, A~z and 0~9)
4 \w match any one whitespace character
5 \s matches any non-white-space character
6 \s matches any non-word character
7 \d Match any one number (0~9)
8 \d Match any non-digit (^0~9)
9 [\b] matches a backspace key character
Ten {n,m} matches the preceding expression n times at least, the maximum is m times
One {n,} matches the preceding expression n times at least
The {n} exactly matches the preceding expression n times
13? Match the preceding expression 0 or 1 times {0,1}
14 + at least match the preceding expression 1 times {1}
15 * Match the preceding expression at least 0 times {0}
16 | Match the preceding expression or the following expression
17 (...) Group items in a unit
18 ^ The beginning of a matching string
19 $ match End of string
\b Matching character bounds
\b A location that matches a non-character boundary
At the same time, enumerate several commonly used regular expressions: (some of which I have used, some of which are found on the Internet)
Copy Code code as follows:
Verify e-mail:
"\w+ ([-+.] \w+) *@\w+ ([-.] \w+) *\.\w+ ([-.] \w+) * "
\s+@\s+\.\s+
Verify URL:
"\s+://\s+\.\s+"
Verify ZIP Code: "\d{6}"
Other common regular Expressions:
Represents 0~9 10 digits: "[0-9]"
Represents any number: "\d*"
Fixed telephone number for mainland China: "\d{3,4}-\d{7,8}"
Verify the ID number consisting of two digits, one hyphen, and 5 digits: "\d{2}-\d{5}"
②, custom validation controls (CustomValidator)
Default page:
Copy Code code as follows:
<asp:customvalidator id= "CustomValidator1" runat= "Server" errormessage= "This username has been registered" ControlToValidate = "Txtname" OnServerValidate = "Validatename" >
</asp:CustomValidator>
Defalult.cs page:
Copy Code code as follows:
public void Validatename (Object sender, ServerValidateEventArgs args)
{
SqlConnection myconn = new SqlConnection ("Data source= (local); Initial catalog=csharp;integrated security=true");
MyConn.Open ();
SqlCommand mycmd = new SqlCommand ("Select Use_account from Users", myconn);
SqlDataAdapter Myda = new SqlDataAdapter (myCMD);
DataSet myds = new DataSet ();
Myda.fill (myds);
for (int i = 0; i < myds.tables[0]. Rows.Count; i++)
{
if (args. value.tostring () = = Myds.tables[0]. Rows[i][0]. ToString ())
{
Args. IsValid = false;
Break
}
Else
{
Args. IsValid = true;
}
}
}
By customizing the server-side function code, it associates with the foreground validation control to form a false client-the effect of the current page validation.
In front of the previous validation control this code as an example:
The ErrorMessage attribute indicates that the error message occurs when the validation is not valid;
The ControlToValidate property represents the ID of the control that needs to be validated;
The OnServerValidate attribute representation is associated with the custom function to perform validation on the server;
The effect is as follows:
Excerpt from secretly in Bloom
