I am still studying. I want to write down some of the knowledge I learned every day. This will deepen my memory and facilitate my review later. Come on!
Using System;
Using System. Collections. Generic;
Using System. Linq;
Using System. Text;
Namespace StringOperate
{
/// <Summary>
/// String operation class
/// </Summary>
Class StrOperate
{
Private static int count; // number of times
Public static int Count
{
Get {return StrOperate. count ;}
Set {StrOperate. count = value ;}
}
Private string strContent; // string
Public string StrContent
{
Get {return strContent ;}
Set {strContent = value ;}
}
Private char searchChar; // The characters to be queried
Public char SearchChar
{
Get {return searchChar ;}
Set {searchChar = value ;}
}
/// <Summary>
/// Define the constructor and initialize the data
/// </Summary>
Public StrOperate (string strContent, char searchChar)
{
This. strContent = strContent;
This. searchChar = searchChar;
}
# Region // number of times a specified character appears in the query string
# Region method 1
/// <Summary>
/// In C #, a string is a character array,
/// Cyclically traverse each element in the character array,
/// Determine the number of times the specified Char appears
/// </Summary>
/// <Returns> specify the number of occurrences of a Char </returns>
Public int SearchCharCount_1 ()
{
Count = 0;
// Cyclically traverse each element (character) in string)
For (int I = 0; I <strContent. Length; I ++)
{
// Determine whether it is equal to the specified character
If (strContent [I] = searchChar)
{
// If the value is equal to, the number of times is increased by 1.
Count ++;
}
}
// Return times
Return count;
}
# Endregion
# Region method 2
/// <Summary>
/// Obtain the number of times through the IndexOf () function and Substring () function
/// </Summary>
/// <Returns> specify the number of occurrences of a Char </returns>
Public int SearchCharCount_2 ()
{
Count = 0;
String strCont = strContent;
While (true)
{
// Use the IndexOf () function to obtain the position where the specified character (searchChar) appears for the first time in the current string.
Int indexChar = strCont. IndexOf (searchChar );
// If the position is greater than or equal to 0, this character exists.
If (indexChar> = 0)
{
// Increase the number of times by 1
Count ++;
// String Update (use the Substring () function to extract the string that appears after the specified character for the next search)
StrCont = strCont. Substring (indexChar + 1 );
}
// Otherwise, if the position is smaller than 0, the current string does not contain any character to be searched.
Else
{
// End the loop
Break;
}
}
// Return times
Return count;
}
# Endregion
# Region method 3
/// <Summary>
/// Obtain the number of times through the Split () function
/// </Summary>
/// <Returns> specify the number of occurrences of a Char </returns>
Public int SearchCharCount_3 ()
{
Count = 0;
// Split the string according to the specified characters, so how many characters will be split)
String [] strs = strContent. Split (searchChar );
// For (int I = 0; I <strs. Length; I ++)
//{
// Console. WriteLine ("-" + strs [I] + "-");
//}
Count = strs. Length-1;
Console. WriteLine ("Lenght =" + strs. Length );
Return count;
}
# Endregion
# Region method 4
/// <Summary>
/// Obtain the number of times through the LastIndexOf () function and Substring () function
/// </Summary>
/// <Returns> specify the number of occurrences of a Char </returns>
Public int SearchCharCount_4 ()
{
Count = 0;
String strCont = strContent;
While (true)
{
// Use the IndexOf () function to obtain the position where the specified character (searchChar) appears for the first time in the current string.
Int indexChar = strCont. LastIndexOf (searchChar );
// If the position is greater than or equal to 0, this character exists.
If (indexChar> = 0)
{
// Increase the number of times by 1
Count ++;
// String Update (use the Substring () function to extract the string that appears after the specified character for the next search)
StrCont = strCont. Substring (0, indexChar );
}
// Otherwise, if the position is smaller than 0, the current string does not contain any character to be searched.
Else
{
// End the loop
Break;
}
}
// Return times
Return count;
}
# Endregion
# Region Method 5
/// <Summary>
/// Use the indexOf (), LastIndexOf (), and Substring () Functions
/// </Summary>
/// <Returns> specify the number of occurrences of a Char </returns>
Public int SearchCharCount_5 ()
{
Count = 0;
String strCont = strContent;
While (true)
{
Int indexof = strCont. IndexOf (searchChar );
Int lastIndexof = strCont. LastIndexOf (searchChar );
If (indexof! = LastIndexof)
{
Count + = 2;
StrCont = strCont. Substring (indexof + 1, lastIndexof-1-indexof );
// Bacdefa
// 0123456
}
Else
{
Break;
}
}
Return count;
}
# Endregion
# Region Method 6
/// <Summary>
/// Use string. ToArray () to convert the string into a character array.
/// </Summary>
/// <Returns> specify the number of occurrences of a Char </returns>
Public int SearchCharCount_6 ()
{
Count = 0;
Char [] chars = strContent. ToArray ();
For (int I = 0; I <chars. Length; I ++)
{
If (chars [I] = searchChar)
{
Count ++;
}
}
Return count;
}
# Endregion
# Endregion
}
}
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