XmlWriter.WriteStartElementAsync(String, String, String) XmlWriter.WriteStartElementAsync(String, String, String) XmlWriter.WriteStartElementAsync(String, String, String) XmlWriter.WriteStartElementAsync(String, String, String) Method

定義

以非同步的方式寫入指定的開頭標記,並將它與指定的命名空間與前置詞產生關聯。Asynchronously writes the specified start tag and associates it with the given namespace and prefix.

public:
 virtual System::Threading::Tasks::Task ^ WriteStartElementAsync(System::String ^ prefix, System::String ^ localName, System::String ^ ns);
public virtual System.Threading.Tasks.Task WriteStartElementAsync (string prefix, string localName, string ns);
abstract member WriteStartElementAsync : string * string * string -> System.Threading.Tasks.Task
override this.WriteStartElementAsync : string * string * string -> System.Threading.Tasks.Task
Public Overridable Function WriteStartElementAsync (prefix As String, localName As String, ns As String) As Task

參數

prefix
String String String String

項目的命名空間前置詞。The namespace prefix of the element.

localName
String String String String

項目的本機名稱。The local name of the element.

ns
String String String String

與項目相關聯的命名空間 URI。The namespace URI to associate with the element.

傳回

表示非同步 WriteStartElement 作業的工作。The task that represents the asynchronous WriteStartElement operation.

例外狀況

在先前的非同步作業完成前呼叫了 XmlWriter 方法。An XmlWriter method was called before a previous asynchronous operation finished. 在此情況下,會擲回 InvalidOperationException 與「非同步作業已經在進行中」的訊息。In this case, InvalidOperationException is thrown with the message "An asynchronous operation is already in progress."

-或--or-

在未將 Async 旗標設為 true的情況下呼叫了 XmlWriter 非同步方法。An XmlWriter asynchronous method was called without setting the Async flag to true. 在此情況下,就會擲回 InvalidOperationException 並顯示訊息「如果您要使用非同步方法,請將 XmlWriterSettings.Async 設為 true」。In this case, InvalidOperationException is thrown with the message "Set XmlWriterSettings.Async to true if you want to use Async Methods."

備註

這是非同步的WriteStartElement,使用相同的功能。This is the asynchronous version of WriteStartElement, with the same functionality. 若要使用此方法,您必須設定Async旗標設為trueTo use this method, you must set the Async flag to true.

適用於

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