XmlWriter.WriteStartAttributeAsync(String, String, String) XmlWriter.WriteStartAttributeAsync(String, String, String) XmlWriter.WriteStartAttributeAsync(String, String, String) XmlWriter.WriteStartAttributeAsync(String, String, String) Method

定義

以非同步的方式寫入具有指定之前置詞、本機名稱和命名空間 URI 之屬性的開頭。Asynchronously writes the start of an attribute with the specified prefix, local name, and namespace URI.

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

參數

prefix
String String String String

屬性的命名空間前置詞。The namespace prefix of the attribute.

localName
String String String String

屬性的本機名稱。The local name of the attribute.

ns
String String String String

屬性的命名空間 URI。The namespace URI for the attribute.

傳回

表示非同步 WriteStartAttribute 作業的工作。The task that represents the asynchronous WriteStartAttribute 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WriteStartAttribute,使用相同的功能。This is the asynchronous version of WriteStartAttribute, 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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