Introduction to asp.net string truncation functions

Character truncation function

The code is as follows:

Copy code

/// <Summary> /// Cut the specified string by the specified length, /// </Summary> /// <Param name = "oldStr"> string to be truncated </param> /// <Param name = "maxLength"> maximum length of a string </param> /// <Param name = "endWith"> suffix that exceeds the length </param> /// <Returns> If the length is exceeded, a new string with a suffix is returned. Otherwise, the original string is returned. </returns> Public static string StringTruncat (string oldStr, int maxLength, string endWith)         { If (string. IsNullOrEmpty (oldStr )) // Throw new NullReferenceException ("the original string cannot be blank "); Return oldStr + endWith; If (maxLength <1) Throw new Exception ("The Returned string length must be greater than [0]"); If (oldStr. Length> maxLength)             { String strTmp = oldStr. Substring (0, maxLength ); If (string. IsNullOrEmpty (endWith )) Return strTmp; Else Return strTmp + endWith;             } Return oldStr;         }

Call method

The code is as follows:	Copy code
<Div> <% # StringTruncat (Eval ("Title"). ToString (), 12, "...") %> </div>

Example 2

The code is as follows:

Copy code

Public string GetContent (string str, string start, string last, int n)     { If (str. ToLower (). IndexOf (start. ToLower ()> = 0)         { If (str. ToLower (). IndexOf (last. ToLower ()> = 0)             { Switch (n)                 { // Intercept both the left and right (both take the front) (including keywords) Case 1: str = str. substring (str. toLower (). indexOf (start. toLower (), str. length-str. toLower (). indexOf (start. toLower (); str = str. substring (0, str. toLower (). indexOf (last. toLower () + last. length); break; // Intercept both the left and right (both take the front) (remove keywords) Case 2: str = str. substring (str. toLower (). indexOf (start. toLower () + start. length, str. length-str. toLower (). indexOf (start. toLower ()-start. length); str = str. substring (0, str. toLower (). indexOf (last. toLower (); break; // Intercept both the left and right (both get the back) (including keywords) Case 3: str = str. substring (str. toLower (). lastIndexOf (start. toLower (), str. length-str. toLower (). lastIndexOf (start. toLower (); str = str. substring (0, str. toLower (). lastIndexOf (last. toLower () + last. length); break; // Intercept both the left and right (both obtain the back) (remove keywords) Case 4: str = str. substring (str. toLower (). lastIndexOf (start. toLower () + start. length, str. length-str. toLower (). lastIndexOf (start. toLower ()-start. length); str = str. substring (0, str. toLower (). lastIndexOf (last. toLower (); break; // Intercept both left and right (first and last) (including keywords) Case 5: str = str. substring (str. toLower (). indexOf (start. toLower (), str. length-str. toLower (). indexOf (start. toLower (); str = str. substring (0, str. toLower (). lastIndexOf (last. toLower () + last. length); break; // Intercept both left and right (first and last) (remove keywords) Case 6: str = str. substring (str. toLower (). indexOf (start. toLower () + start. length, str. length-str. toLower (). indexOf (start. toLower ()-start. length); str = str. substring (0, str. toLower (). lastIndexOf (last. toLower (); break; Default: str = ""; break;                 }             } Else             { Switch (n)                 { // Only truncate to the left (take the previous one) (including keywords) Case 7: str = str. Substring (0, str. ToLower (). IndexOf (start. ToLower () + start. Length); break; // Only truncate to the left (take the previous one) (remove the keyword) Case 8: str = str. Substring (0, str. ToLower (). IndexOf (start. ToLower (); break; // Only truncate to the left (obtain the following) (including keywords) Case 9: str = str. Substring (0, str. ToLower (). LastIndexOf (start. ToLower () + start. Length); break; // Only truncate to the left (obtain the following) (remove the keyword) Case 10: str = str. Substring (0, str. ToLower (). LastIndexOf (start. ToLower (); break; // Only truncate to the right (take the previous part) (including keywords) Case 11: str = str. substring (str. toLower (). indexOf (start. toLower (), str. length-str. toLower (). indexOf (start. toLower (); break; // Only truncate to the right (take the previous one) (remove the keyword) Case 12: str = str. substring (str. toLower (). indexOf (start. toLower () + start. length, str. length-str. toLower (). indexOf (start. toLower ()-start. length); break; // Only truncate to the right (obtain the following) (including keywords) Case 13: str = str. substring (str. toLower (). lastIndexOf (start. toLower (), str. length-str. toLower (). lastIndexOf (start. toLower (); break; // Only truncate to the right (obtain the back part) (remove the keyword) Case 14: str = str. substring (str. toLower (). lastIndexOf (start. toLower () + start. length, str. length-str. toLower (). lastIndexOf (start. toLower ()-start. length); break; Default: str = "none"; break;                 }             }         } Else         { Str = "none! ";         } Return str }