Question

我在WPF C＃中编程。我有例如以下路径：

C:\Program Files\hello.txt

我希望从中输出“ hello ”。

路径是从数据库中提取的字符串。目前我正在使用以下方法（从'\'拆分路径然后再用'。'拆分）：

string path = "C:\\Program Files\\hello.txt";
string[] pathArr = path.Split('\\');
string[] fileArr = pathArr.Last().Split('.');
string fileName = fileArr.Last().ToString();

它有效，但我相信应该有更短更聪明的解决方案。有什么想法吗？

Answer 1

Path.GetFileName

Path.GetFileNameWithoutExtension

Path课很棒。

Answer 2

试

fileName = Path.GetFileName (path);

http://msdn.microsoft.com/de-de/library/system.io.path.getfilename.aspx

Answer 3

试

System.IO.Path.GetFileNameWithoutExtension(path);

演示

string fileName = @"C:\mydir\myfile.ext";
string path = @"C:\mydir\";
string result;

result = Path.GetFileNameWithoutExtension(fileName);
Console.WriteLine("GetFileNameWithoutExtension('{0}') returns '{1}'", 
    fileName, result);

result = Path.GetFileName(path);
Console.WriteLine("GetFileName('{0}') returns '{1}'", 
    path, result);

// This code produces output similar to the following:
//
// GetFileNameWithoutExtension('C:\mydir\myfile.ext') returns 'myfile'
// GetFileName('C:\mydir\') returns ''

https://msdn.microsoft.com/en-gb/library/system.io.path.getfilenamewithoutextension%28v=vs.80%29.aspx

Answer 4

您可以使用Path API，如下所示：

 var filenNme = Path.GetFileNameWithoutExtension([File Path]);

更多信息：Path.GetFileNameWithoutExtension

Answer 5

var fileNameWithoutExtension = Path.GetFileNameWithoutExtension(path);

Path.GetFileNameWithoutExtension

Answer 6

试试这个：

string fileName = Path.GetFileNameWithoutExtension(@"C:\Program Files\hello.txt");

这将为fileName返回“hello”。

Answer 7

试试这个，

string FilePath=@"C:\mydir\myfile.ext";
string Result=Path.GetFileName(FilePath);//With Extension
string Result=Path.GetFileNameWithoutExtension(FilePath);//Without Extension

Answer 8

首先，问题中的代码不会产生描述的输出。它提取文件扩展名（"txt"），而不提取文件基本名（"hello"）。为此，最后一行应这样调用First()，而不是Last() ...

static string GetFileBaseNameUsingSplit(string path)
{
    string[] pathArr = path.Split('\\');
    string[] fileArr = pathArr.Last().Split('.');
    string fileBaseName = fileArr.First().ToString();

    return fileBaseName;
}

进行了这种更改，就改进此代码而言，要考虑的一件事是它创建的垃圾量：

一个string[]，其中每个string中的每个路径段都包含一个path
在string[]的最后一个路径段中，每个string至少包含一个.的{{1}}

因此，从示例路径path中提取基本文件名应产生"C:\Program Files\hello.txt"，object，"C:"，"Program Files"，{ {1}}，"hello.txt"，"hello"和"txt"。如果在大量路径上调用该方法，则可能很重要。为了改善这一点，我们可以自己搜索string[3]来找到基本名称的起点和终点，并使用它们创建一个一个新的string[2] ...

path

这是使用最后一个string之后的字符索引作为基础名称的开头，然后从那里寻找第一个static string GetFileBaseNameUsingSubstringUnsafe(string path) { // Fails on paths with no file extension - DO NOT USE!! int startIndex = path.LastIndexOf('\\') + 1; int endIndex = path.IndexOf('.', startIndex); string fileBaseName = path.Substring(startIndex, endIndex - startIndex); return fileBaseName; }用作结尾之后的字符索引基本名称的名称。这比原始代码短吗？不完全的。它是“更智能”的解决方案吗？我认同。至少，如果不是这样的话……

从注释中可以看到，以前的方法有问题。尽管如果您假设所有路径都以带有扩展名的文件名结尾是可行的，但是如果路径以\结尾（即目录路径），或者在最后一段中不包含任何扩展名，它将抛出异常。要解决此问题，我们需要为.为\（即未找到endIndex）时添加一个额外的支票来说明...

-1

现在，此版本比原始版本短得多，但效率更高，现在也正确。

对于实现此功能的.NET方法，许多其他答案建议使用Path.GetFileNameWithoutExtension()，这是一个显而易见的简单解决方案，但不会产生与其中的代码相同的结果问题。 .和static string GetFileBaseNameUsingSubstringSafe(string path) { int startIndex = path.LastIndexOf('\\') + 1; int endIndex = path.IndexOf('.', startIndex); int length = (endIndex >= 0 ? endIndex : path.Length) - startIndex; string fileBaseName = path.Substring(startIndex, length); return fileBaseName; }（下面的GetFileBaseNameUsingSplit()）之间存在细微但重要的区别：前者提取 first Path.GetFileNameWithoutExtension()之前的所有内容，而后者提取 first GetFileBaseNameUsingPath()提取 last .之前的所有内容。这与问题中的示例.并没有什么区别，但请看一下这张表，比较了以不同路径调用时上述四种方法的结果...

path

...，您将看到| Description | Method | Path | Result | |-----------------------|---------------------------------------|----------------------------------|------------------------------------------------------------------| | Single extension | GetFileBaseNameUsingSplit() | "C:\Program Files\hello.txt" | "hello" | | Single extension | GetFileBaseNameUsingPath() | "C:\Program Files\hello.txt" | "hello" | | Single extension | GetFileBaseNameUsingSubstringUnsafe() | "C:\Program Files\hello.txt" | "hello" | | Single extension | GetFileBaseNameUsingSubstringSafe() | "C:\Program Files\hello.txt" | "hello" | |-----------------------|---------------------------------------|----------------------------------|------------------------------------------------------------------| | Double extension | GetFileBaseNameUsingSplit() | "C:\Program Files\hello.txt.ext" | "hello" | | Double extension | GetFileBaseNameUsingPath() | "C:\Program Files\hello.txt.ext" | "hello.txt" | | Double extension | GetFileBaseNameUsingSubstringUnsafe() | "C:\Program Files\hello.txt.ext" | "hello" | | Double extension | GetFileBaseNameUsingSubstringSafe() | "C:\Program Files\hello.txt.ext" | "hello" | |-----------------------|---------------------------------------|----------------------------------|------------------------------------------------------------------| | No extension | GetFileBaseNameUsingSplit() | "C:\Program Files\hello" | "hello" | | No extension | GetFileBaseNameUsingPath() | "C:\Program Files\hello" | "hello" | | No extension | GetFileBaseNameUsingSubstringUnsafe() | "C:\Program Files\hello" | EXCEPTION: Length cannot be less than zero. (Parameter 'length') | | No extension | GetFileBaseNameUsingSubstringSafe() | "C:\Program Files\hello" | "hello" | |-----------------------|---------------------------------------|----------------------------------|------------------------------------------------------------------| | Leading period | GetFileBaseNameUsingSplit() | "C:\Program Files\.hello.txt" | "" | | Leading period | GetFileBaseNameUsingPath() | "C:\Program Files\.hello.txt" | ".hello" | | Leading period | GetFileBaseNameUsingSubstringUnsafe() | "C:\Program Files\.hello.txt" | "" | | Leading period | GetFileBaseNameUsingSubstringSafe() | "C:\Program Files\.hello.txt" | "" | |-----------------------|---------------------------------------|----------------------------------|------------------------------------------------------------------| | Trailing period | GetFileBaseNameUsingSplit() | "C:\Program Files\hello.txt." | "hello" | | Trailing period | GetFileBaseNameUsingPath() | "C:\Program Files\hello.txt." | "hello.txt" | | Trailing period | GetFileBaseNameUsingSubstringUnsafe() | "C:\Program Files\hello.txt." | "hello" | | Trailing period | GetFileBaseNameUsingSubstringSafe() | "C:\Program Files\hello.txt." | "hello" | |-----------------------|---------------------------------------|----------------------------------|------------------------------------------------------------------| | Directory path | GetFileBaseNameUsingSplit() | "C:\Program Files\" | "" | | Directory path | GetFileBaseNameUsingPath() | "C:\Program Files\" | "" | | Directory path | GetFileBaseNameUsingSubstringUnsafe() | "C:\Program Files\" | EXCEPTION: Length cannot be less than zero. (Parameter 'length') | | Directory path | GetFileBaseNameUsingSubstringSafe() | "C:\Program Files\" | "" | |-----------------------|---------------------------------------|----------------------------------|------------------------------------------------------------------| | Current file path | GetFileBaseNameUsingSplit() | "hello.txt" | "hello" | | Current file path | GetFileBaseNameUsingPath() | "hello.txt" | "hello" | | Current file path | GetFileBaseNameUsingSubstringUnsafe() | "hello.txt" | "hello" | | Current file path | GetFileBaseNameUsingSubstringSafe() | "hello.txt" | "hello" | |-----------------------|---------------------------------------|----------------------------------|------------------------------------------------------------------| | Parent file path | GetFileBaseNameUsingSplit() | "..\hello.txt" | "hello" | | Parent file path | GetFileBaseNameUsingPath() | "..\hello.txt" | "hello" | | Parent file path | GetFileBaseNameUsingSubstringUnsafe() | "..\hello.txt" | "hello" | | Parent file path | GetFileBaseNameUsingSubstringSafe() | "..\hello.txt" | "hello" | |-----------------------|---------------------------------------|----------------------------------|------------------------------------------------------------------| | Parent directory path | GetFileBaseNameUsingSplit() | ".." | "" | | Parent directory path | GetFileBaseNameUsingPath() | ".." | "." | | Parent directory path | GetFileBaseNameUsingSubstringUnsafe() | ".." | "" | | Parent directory path | GetFileBaseNameUsingSubstringSafe() | ".." | "" | |-----------------------|---------------------------------------|----------------------------------|------------------------------------------------------------------|在传递路径时出现不同的结果，该路径中文件名具有双扩展名或前导和/或尾随Path.GetFileNameWithoutExtension()。您可以使用以下代码自行尝试...

TL; DR 问题中的代码在某些极端情况下的表现似乎并不理想。如果您要编写自己的路径操作代码，请务必考虑...

...如何定义“扩展名”（是第一个using System; using System.IO; using System.Linq; using System.Reflection; namespace SO6921105 { internal class PathExtractionResult { public string Description { get; set; } public string Method { get; set; } public string Path { get; set; } public string Result { get; set; } } public static class Program { private static string GetFileBaseNameUsingSplit(string path) { string[] pathArr = path.Split('\\'); string[] fileArr = pathArr.Last().Split('.'); string fileBaseName = fileArr.First().ToString(); return fileBaseName; } private static string GetFileBaseNameUsingPath(string path) { return Path.GetFileNameWithoutExtension(path); } private static string GetFileBaseNameUsingSubstringUnsafe(string path) { // Fails on paths with no file extension - DO NOT USE!! int startIndex = path.LastIndexOf('\\') + 1; int endIndex = path.IndexOf('.', startIndex); string fileBaseName = path.Substring(startIndex, endIndex - startIndex); return fileBaseName; } private static string GetFileBaseNameUsingSubstringSafe(string path) { int startIndex = path.LastIndexOf('\\') + 1; int endIndex = path.IndexOf('.', startIndex); int length = (endIndex >= 0 ? endIndex : path.Length) - startIndex; string fileBaseName = path.Substring(startIndex, length); return fileBaseName; } public static void Main() { MethodInfo[] testMethods = typeof(Program).GetMethods(BindingFlags.NonPublic | BindingFlags.Static) .Where(method => method.Name.StartsWith("GetFileBaseName")) .ToArray(); var inputs = new[] { new { Description = "Single extension", Path = @"C:\Program Files\hello.txt" }, new { Description = "Double extension", Path = @"C:\Program Files\hello.txt.ext" }, new { Description = "No extension", Path = @"C:\Program Files\hello" }, new { Description = "Leading period", Path = @"C:\Program Files\.hello.txt" }, new { Description = "Trailing period", Path = @"C:\Program Files\hello.txt." }, new { Description = "Directory path", Path = @"C:\Program Files\" }, new { Description = "Current file path", Path = "hello.txt" }, new { Description = "Parent file path", Path = @"..\hello.txt" }, new { Description = "Parent directory path", Path = ".." } }; PathExtractionResult[] results = inputs .SelectMany( input => testMethods.Select( method => { string result; try { string returnValue = (string) method.Invoke(null, new object[] { input.Path }); result = $"\"{returnValue}\""; } catch (Exception ex) { if (ex is TargetInvocationException) ex = ex.InnerException; result = $"EXCEPTION: {ex.Message}"; } return new PathExtractionResult() { Description = input.Description, Method = $"{method.Name}()", Path = $"\"{input.Path}\"", Result = result }; } ) ).ToArray(); const int ColumnPadding = 2; ResultWriter writer = new ResultWriter(Console.Out) { DescriptionColumnWidth = results.Max(output => output.Description.Length) + ColumnPadding, MethodColumnWidth = results.Max(output => output.Method.Length) + ColumnPadding, PathColumnWidth = results.Max(output => output.Path.Length) + ColumnPadding, ResultColumnWidth = results.Max(output => output.Result.Length) + ColumnPadding, ItemLeftPadding = " ", ItemRightPadding = " " }; PathExtractionResult header = new PathExtractionResult() { Description = nameof(PathExtractionResult.Description), Method = nameof(PathExtractionResult.Method), Path = nameof(PathExtractionResult.Path), Result = nameof(PathExtractionResult.Result) }; writer.WriteResult(header); writer.WriteDivider(); foreach (IGrouping<string, PathExtractionResult> resultGroup in results.GroupBy(result => result.Description)) { foreach (PathExtractionResult result in resultGroup) writer.WriteResult(result); writer.WriteDivider(); } } } internal class ResultWriter { private const char DividerChar = '-'; private const char SeparatorChar = '|'; private TextWriter Writer { get; } public ResultWriter(TextWriter writer) { Writer = writer ?? throw new ArgumentNullException(nameof(writer)); } public int DescriptionColumnWidth { get; set; } public int MethodColumnWidth { get; set; } public int PathColumnWidth { get; set; } public int ResultColumnWidth { get; set; } public string ItemLeftPadding { get; set; } public string ItemRightPadding { get; set; } public void WriteResult(PathExtractionResult result) { WriteLine( $"{ItemLeftPadding}{result.Description}{ItemRightPadding}", $"{ItemLeftPadding}{result.Method}{ItemRightPadding}", $"{ItemLeftPadding}{result.Path}{ItemRightPadding}", $"{ItemLeftPadding}{result.Result}{ItemRightPadding}" ); } public void WriteDivider() { WriteLine( new string(DividerChar, DescriptionColumnWidth), new string(DividerChar, MethodColumnWidth), new string(DividerChar, PathColumnWidth), new string(DividerChar, ResultColumnWidth) ); } private void WriteLine(string description, string method, string path, string result) { Writer.Write(SeparatorChar); Writer.Write(description.PadRight(DescriptionColumnWidth)); Writer.Write(SeparatorChar); Writer.Write(method.PadRight(MethodColumnWidth)); Writer.Write(SeparatorChar); Writer.Write(path.PadRight(PathColumnWidth)); Writer.Write(SeparatorChar); Writer.Write(result.PadRight(ResultColumnWidth)); Writer.WriteLine(SeparatorChar); } } }之前的所有内容还是最后一个.之前的所有内容？）
...具有多个扩展名的文件
...没有扩展名的文件
...文件中带有前导.的文件
...后缀为.的文件（可能不是Windows上遇到的文件，但它们是possible）
...具有“扩展名”或其他包含.的目录
...以.结尾的路径
...相对路径

并非所有文件路径都遵循\的通常公式！

Answer 9

.reveal {
  z-index: 5;
  position: absolute;
  top: calc(50% - 10rem);
  left: calc(50% - 10rem);
  width: 20rem;
  height: 20rem;
  background: url("http://i.imgur.com/Im9luhE.png") 50% 50% no-repeat fixed;
  background-size: cover;
  border-radius: 50%;
  -webkit-mask-image: -webkit-radial-gradient(center, ellipse cover, rgba(255,255,255,1) 0%, rgba(255,255,255,0.8) 36%, rgba(255,255,255,0) 70%);
}

Answer 10

string filepath = "C:\\Program Files\\example.txt";
FileVersionInfo myFileVersionInfo = FileVersionInfo.GetVersionInfo(filepath);
FileInfo fi = new FileInfo(filepath);
Console.WriteLine(fi.Name);

//input to the "fi" is a full path to the file from "filepath"
//This code will return the fileName from the given path

//output
//example.txt

从C＃中的路径字符串中获取文件名

10 个答案: