Remove file extension from a file name string

Question

If I have a string saying  abc txt   is there a quick way to get a substring that is just  abc    I can t do an fileName IndexOf      because the file name could be  abc 123 txt  or something and I obviously just want to get rid of the extension  i e   abc 123

User · Answer

String LastIndexOf would work   string fileName   abc 123 txt   int fileExtPos   fileName LastIndexOf       if  fileExtPos  gt   0    fileName  fileName Substring 0  fileExtPos

User · Answer

You can use  string extension   System IO Path GetExtension filename     And then remove the extension manually   string result   filename Substring 0  filename Length - extension Length

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You maybe not asking the UWP api   But in UWP  file DisplayName is the name without extensions  Hope useful for others

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if you want to use String operation then you can use the function lastIndexOf    which Searches for the last occurrence of a character or substring  Java has numerous string functions

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This implementation should work     string file    abc txt   string fileNoExtension   file Replace   txt

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lt summary gt          Get the extension from the given filename          lt  summary gt           lt param name  fileName  gt the given filename ie abc 123 txt lt  param gt           lt returns gt the extension ie txt lt  returns gt      public static string GetFileExtension this string fileName                string ext   string Empty          int fileExtPos   fileName LastIndexOf      StringComparison Ordinal           if  fileExtPos  gt   0              ext   fileName Substring fileExtPos  fileName Length - fileExtPos            return ext

User · Answer

If you want to create full path without extension you can do something like this   Path Combine  Path GetDirectoryName fullPath   Path GetFileNameWithoutExtension fullPath     but I m looking for simpler way to do that  Does anyone have any idea

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The Path GetFileNameWithoutExtension method gives you the filename you pass as an argument without the extension  as should be obvious from the name

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I know it s an old question and Path GetFileNameWithoutExtensionis a better and maybe cleaner option  But personally I ve added this two methods to my project and wanted to share them  This requires C  8 0 due to it using ranges and indices   public static string RemoveExtension this string file    gt  ReplaceExtension file  null    public static string ReplaceExtension this string file  string extension        var split   file Split            if  string IsNullOrEmpty extension           return string Join      split    1         split  1    extension       return string Join      split

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I used the below  less code  string fileName    C  file docx   MessageBox Show Path Combine Path GetDirectoryName fileName  Path GetFileNameWithoutExtension fileName       Output will be      C  file

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private void btnfilebrowse Click object sender  EventArgs e                        OpenFileDialog dlg   new OpenFileDialog                  dlg ShowDialog                dlg Filter    CSV files    csv    csv XML files    xml    xml               if  dlg ShowDialog      DialogResult OK                                string fileName                  fileName   dlg FileName                  string filecopy                  filecopy   dlg FileName                  filecopy   Path GetFileName filecopy                   string strFilename                  strFilename   filecopy                   strFilename   strFilename Substring 0  strFilename LastIndexOf                          fileName   Path GetFileName fileName                                 txtfilepath Text   strFilename                   string filedest   System IO Path GetFullPath     Excels Read     txtfilepath Text    csv                      filedest    C   Users  adm  Documents  Visual Studio 2010  Projects  ConvertFile  ConvertFile  Excels Read                   FileInfo file   new FileInfo fileName                   file CopyTo filedest                   File Copy fileName  filedest true                   MessageBox Show  Import Done

User · Answer

There s a method in the framework for this purpose  which will keep the full path except for the extension   System IO Path ChangeExtension path  null     If only file name is needed  use  System IO Path GetFileNameWithoutExtension path

[c#] Remove file extension from a file name string

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