CodeDomProvider.IsDefinedExtension(String) 方法

public:
 static bool IsDefinedExtension(System::String ^ extension);

public static bool IsDefinedExtension(string extension);

[System.Runtime.InteropServices.ComVisible(false)]
public static bool IsDefinedExtension(string extension);

static member IsDefinedExtension : string -> bool

[<System.Runtime.InteropServices.ComVisible(false)>]
static member IsDefinedExtension : string -> bool

Public Shared Function IsDefinedExtension (extension As String) As Boolean

參數

傳回

true若CodeDomProvider實作設定為指定的副檔名;否則， false

屬性

ComVisibleAttribute

例外狀況

範例

以下程式碼範例決定輸入檔名副檔名的實作， CodeDomProvider 並顯示語言提供者的設定。 此程式碼範例是本類別更大範例 CompilerInfo 的一部分。

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

機器設定檔中的 system.codedom< 元素（Machine.config）包含電腦上每個實作的語言提供者與編譯器設定。>CodeDomProvider 該 IsDefinedExtension 方法會搜尋提供者設定元素中指定的副檔名。

檔案名稱副檔名不區分大小寫。

另請參閱

• GetLanguageFromExtension(String)
• CreateProvider(String)
• 編譯器與語言提供者設定架構