CodeDomProvider.GetLanguageFromExtension(String) 方法

定義

命名空間:

System.CodeDom.Compiler

組件:

System.CodeDom.dll

套件:

System.CodeDom v8.0.0

來源:

CodeDomProvider.cs

傳回與指定副檔名關聯的語言名稱，如 CodeDomProvider 編譯器組態區段的設定。

public:
 static System::String ^ GetLanguageFromExtension(System::String ^ extension);

public static string GetLanguageFromExtension (string extension);

static member GetLanguageFromExtension : string -> string

Public Shared Function GetLanguageFromExtension (extension As String) As String

參數

extension

String

副檔名。

傳回

String

與指定副檔名關聯的語言名稱，如 CodeDomProvider 編譯器組態設定的設定。

例外狀況

ConfigurationException

extension 在這部電腦上沒有已設定的語言提供者。

ConfigurationErrorsException

extension 為 null。

SecurityException

呼叫端沒有必要的權限。

範例

下列程式代碼範例會 CodeDomProvider 決定輸入檔擴展名的實作，並顯示語言提供者的已設定設定。 此程式代碼範例是針對 類別提供的較大範例的 CompilerInfo 一部分。

if (  !fileExtension->StartsWith(  "." ) )
   fileExtension = String::Concat( ".", fileExtension );

// Get the language associated with the file extension.
CodeDomProvider^ provider = nullptr;
if ( CodeDomProvider::IsDefinedExtension( fileExtension ) )
{
   String^ language = CodeDomProvider::GetLanguageFromExtension( fileExtension );
   if ( language )
      Console::WriteLine( "The language \"{0}\" is associated with file extension \"{1}\"\n",
                           language, fileExtension );

   // Check for a corresponding language provider.
   if ( language && CodeDomProvider::IsDefinedLanguage( language ) )
   {
      provider = CodeDomProvider::CreateProvider( language );
      if ( provider )
      {
         // Display information about this language provider.
         Console::WriteLine( "Language provider:  {0}\n", provider->ToString() );
         
         // Get the compiler settings for this language.
         CompilerInfo^ langCompilerInfo = CodeDomProvider::GetCompilerInfo( language );
         if ( langCompilerInfo )
         {
            CompilerParameters^ langCompilerConfig = langCompilerInfo->CreateDefaultCompilerParameters();
            if ( langCompilerConfig )
            {
               Console::WriteLine( "  Compiler options:        {0}", langCompilerConfig->CompilerOptions );
               Console::WriteLine( "  Compiler warning level:  {0}", langCompilerConfig->WarningLevel.ToString() );
            }
         }
      }
   }
}

if ( provider == nullptr )  // Tell the user that the language provider was not found.
   Console::WriteLine( "There is no language provider associated with input file extension \"{0}\".", fileExtension );

if (fileExtension[0] != '.')
{
    fileExtension = "." + fileExtension;
}

// Get the language associated with the file extension.
if (CodeDomProvider.IsDefinedExtension(fileExtension))
{
    CodeDomProvider provider;
    String language = CodeDomProvider.GetLanguageFromExtension(fileExtension);

    Console.WriteLine("The language \"{0}\" is associated with file extension \"{1}\"",
        language, fileExtension);
    Console.WriteLine();

    // Next, check for a corresponding language provider.

    if (CodeDomProvider.IsDefinedLanguage(language))
    {
        provider = CodeDomProvider.CreateProvider(language);

        // Display information about this language provider.

        Console.WriteLine("Language provider:  {0}",
            provider.ToString());
        Console.WriteLine();

        // Get the compiler settings for this language.

        CompilerInfo langCompilerInfo = CodeDomProvider.GetCompilerInfo(language);
        CompilerParameters langCompilerConfig = langCompilerInfo.CreateDefaultCompilerParameters();

        Console.WriteLine("  Compiler options:        {0}",
            langCompilerConfig.CompilerOptions);
        Console.WriteLine("  Compiler warning level:  {0}",
            langCompilerConfig.WarningLevel);
    }
}
else
{
    // Tell the user that the language provider was not found.
    Console.WriteLine("There is no language provider associated with input file extension \"{0}\".",
        fileExtension);
}

If Not fileExtension.StartsWith(".") Then
   fileExtension = "." + fileExtension
End If

' Get the language associated with the file extension.
If CodeDomProvider.IsDefinedExtension(fileExtension) Then
   Dim provider As CodeDomProvider
   Dim language As String = CodeDomProvider.GetLanguageFromExtension(fileExtension)
   
   Console.WriteLine("The language ""{0}"" is associated with file extension ""{1}""", _
       language, fileExtension)
   Console.WriteLine()
   
   ' Check for a corresponding language provider.
   If CodeDomProvider.IsDefinedLanguage(language) Then
      provider = CodeDomProvider.CreateProvider(language)
      
      ' Display information about this language provider.
      Console.WriteLine("Language provider:  {0}", _
         provider.ToString())
      Console.WriteLine()
      
      ' Get the compiler settings for this language.
      Dim langCompilerInfo As CompilerInfo = CodeDomProvider.GetCompilerInfo(language)
      Dim langCompilerConfig As CompilerParameters = langCompilerInfo.CreateDefaultCompilerParameters()
      
      Console.WriteLine("  Compiler options:        {0}", _
          langCompilerConfig.CompilerOptions)
      Console.WriteLine("  Compiler warning level:  {0}", _
          langCompilerConfig.WarningLevel)
   End If
Else
   ' Tell the user that the language provider was not found.
   Console.WriteLine("There is no language provider associated with input file extension ""{0}"".", fileExtension)
End If

備註

電腦組態檔中的 system.codedom> 元素 (Machine.config) 包含電腦上每個實作的語言提供者和編譯程式組態設定。<CodeDomProvider 方法會 GetLanguageFromExtension 搜尋每個提供者組態專案，以取得指定的擴展名。

方法 IsDefinedExtension 會檢查至少一個提供者實作是否支援特定的擴展名。 您可以將擴展名傳遞至 GetLanguageFromExtension之前，先使用 IsDefinedExtension 驗證擴展名。 這可防止 GetLanguageFromExtension 針對不支援的擴展名擲回 System.Configuration.ConfigurationException 。

如果提供者實作支援輸入檔擴展名，且該提供者已設定多個支持的語言，則 GetLanguageFromExtension 傳回該提供者的第一個語言名稱。 如果為輸入檔擴展名設定多個提供者實作，請 GetLanguageFromExtension 從最後一個相符的提供者組態專案傳回語言名稱。

語言名稱和擴展名不區分大小寫。

另請參閱

• IsDefinedExtension(String)
• CreateProvider(String)
• 編譯器和語言提供者設定結構描述