FileInfo - ChangeExtension
Changes the extension of a specified file path.
public static void Main() { string FileName = "test.txt"; Console.WriteLine("File name: {0}",FileName); // C# Extension Method: FileInfo - ChangeExtension string newFileName = FileName.ToFileInfo().ChangeExtension("md"); Console.WriteLine("File name after changing extension: {0}", newFileName); }
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using System; using System.IO; public static partial class Extensions { /// <summary> /// Changes the extension of a @this string. /// </summary> /// <param name="this"> /// The @this information to modify. The @this cannot contain any of the characters defined in /// <see /// cref="M:System.IO.Path.GetInvalidPathChars" /> /// . /// </param> /// <param name="extension"> /// The new extension (with or without a leading period). Specify null to remove an existing /// extension from /// <paramref /// name="this" /> /// . /// </param> /// <returns> /// The modified @this information.On Windows-based desktop platforms, if <paramref name="this" /> is null or an /// empty string (""), the @this information is returned unmodified. If /// <paramref /// name="extension" /> /// is null, the returned string contains the specified @this with its extension removed. If /// <paramref /// name="this" /> /// has no extension, and <paramref name="extension" /> is not null, the returned @this string contains /// <paramref /// name="extension" /> /// appended to the end of <paramref name="this" />. /// </returns> /// ### /// <exception cref="T:System.ArgumentException"> /// <paramref name="this" /> contains one or more of the invalid /// characters defined in /// <see /// cref="M:System.IO.Path.GetInvalidPathChars" /> /// . /// </exception> public static String ChangeExtension(this FileInfo @this, String extension) { return Path.ChangeExtension(@this.FullName, extension); } }