CodeDomProvider.IsDefinedLanguage(String) 方法

定义

命名空间:

System.CodeDom.Compiler

程序集:

System.CodeDom.dll

包:

System.CodeDom v8.0.0

Source:

CodeDomProvider.cs

测试某语言是否已在计算机上配置了 CodeDomProvider 实现。

public:
 static bool IsDefinedLanguage(System::String ^ language);

public static bool IsDefinedLanguage (string language);

static member IsDefinedLanguage : string -> bool

Public Shared Function IsDefinedLanguage (language As String) As Boolean

参数

language

String

语言名称。

返回

Boolean

如果为指定语言配置了 CodeDomProvider 实现，则为 true；否则，为 false。

例外

ArgumentNullException

language 为 null。

SecurityException

调用方没有所要求的权限。

示例

下面的代码示例确定输入语言的 CodeDomProvider 实现，并显示语言提供程序的配置设置。 此代码示例是为 CompilerInfo 类提供的一个更大示例的一部分。

CodeDomProvider^ provider = nullptr;

// Check for a provider corresponding to the input language.  
if ( CodeDomProvider::IsDefinedLanguage( language ) )
{
   provider = CodeDomProvider::CreateProvider( language );
   if ( provider )
   {
      // Display information about this language provider.
      Console::WriteLine( "Language provider:  {0}", provider->ToString() );
      Console::WriteLine();
      Console::WriteLine( "  Default file extension:  {0}", provider->FileExtension );
      Console::WriteLine();
      
      // 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 provider configured for input language \"{0}\".", language );

CodeDomProvider provider;

// Check for a provider corresponding to the input language.
if (CodeDomProvider.IsDefinedLanguage(language))
{
    provider = CodeDomProvider.CreateProvider(language);

    // Display information about this language provider.

    Console.WriteLine("Language provider:  {0}",
        provider.ToString());
    Console.WriteLine();
    Console.WriteLine("  Default file extension:  {0}",
        provider.FileExtension);
    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 provider configured for input language \"{0}\".",
        language);
}

Dim provider As CodeDomProvider

' Check for a provider corresponding to the input language.  
If CodeDomProvider.IsDefinedLanguage(language) Then
   provider = CodeDomProvider.CreateProvider(language)
   
   ' Display information about this language provider.
   Console.WriteLine("Language provider:  {0}", _
       provider.ToString())
   Console.WriteLine()
   Console.WriteLine("  Default file extension:  {0}", _
       provider.FileExtension)
   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)
Else
   ' Tell the user that the language provider was not found.
   Console.WriteLine("There is no provider configured for input language ""{0}"".", _
       language)
End If

注解

计算机配置文件中的 system.codedom> 元素 (Machine.config) 包含计算机上每个实现的语言提供程序和编译器配置设置。<CodeDomProvider 方法 IsDefinedLanguage 在提供程序配置元素中搜索指定的语言名称。

语言名称不区分大小写。

另请参阅

• CreateProvider(String)
• 编译器和语言提供程序设置架构