ElementInformation.IsPresent 属性

定义

命名空间:

System.Configuration

程序集:

System.Configuration.ConfigurationManager.dll

程序集:

System.Configuration.dll

获取一个值，该值指示关联的 ConfigurationElement 对象是否位于配置文件中。

public:
 property bool IsPresent { bool get(); };

public bool IsPresent { get; }

member this.IsPresent : bool

Public ReadOnly Property IsPresent As Boolean

属性值

Boolean

如果关联的 ConfigurationElement 对象位于配置文件中，则为 true；否则为 false。

示例

下面的示例演示如何使用 IsPresent 属性。

static public void IsElementPresent()
{
    // Get the current configuration file.
    System.Configuration.Configuration config =
            ConfigurationManager.OpenExeConfiguration(
            ConfigurationUserLevel.None);

    // Get the section.
    UrlsSection section =
        (UrlsSection)config.GetSection("MyUrls");

    // Get the element.
    UrlConfigElement url = section.Simple;

    bool isPresent =
        url.ElementInformation.IsPresent;
    Console.WriteLine("Url element is present? {0}",
        isPresent.ToString());
}

Public Shared Sub IsElementPresent() 

    ' Get the current configuration file.
    Dim config _
    As System.Configuration.Configuration = _
    ConfigurationManager.OpenExeConfiguration( _
    ConfigurationUserLevel.None)

    ' Get the section.
    Dim section As UrlsSection = _
    CType(config.GetSection("MyUrls"), UrlsSection)
    
    ' Get the element.
    Dim url As UrlConfigElement = _
    section.Simple
    
    Dim isPresent As Boolean = _
    url.ElementInformation.IsPresent
    Console.WriteLine("Url element is present? {0}", _
    isPresent.ToString())

End Sub