XmlWriter.WriteDocTypeAsync(String, String, String, String) Method
Definition
Important
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Asynchronously writes the DOCTYPE declaration with the specified name and optional attributes.
public:
virtual System::Threading::Tasks::Task ^ WriteDocTypeAsync(System::String ^ name, System::String ^ pubid, System::String ^ sysid, System::String ^ subset);public virtual System.Threading.Tasks.Task WriteDocTypeAsync (string name, string pubid, string sysid, string subset);public virtual System.Threading.Tasks.Task WriteDocTypeAsync (string name, string? pubid, string? sysid, string? subset);abstract member WriteDocTypeAsync : string * string * string * string -> System.Threading.Tasks.Task
override this.WriteDocTypeAsync : string * string * string * string -> System.Threading.Tasks.TaskPublic Overridable Function WriteDocTypeAsync (name As String, pubid As String, sysid As String, subset As String) As TaskParameters
- name
- String
The name of the DOCTYPE. This must be non-empty.
- pubid
- String
If non-null it also writes PUBLIC "pubid" "sysid" where pubid and sysid are replaced with the value of the given arguments.
- sysid
- String
If pubid is null and sysid is non-null it writes SYSTEM "sysid" where sysid is replaced with the value of this argument.
- subset
- String
If non-null it writes [subset] where subset is replaced with the value of this argument.
Returns
The task that represents the asynchronous WriteDocType operation.
Exceptions
An XmlWriter method was called before a previous asynchronous operation finished. In this case, InvalidOperationException is thrown with the message "An asynchronous operation is already in progress."
-or-
An XmlWriter asynchronous method was called without setting the Async flag to true. In this case, InvalidOperationException is thrown with the message "Set XmlWriterSettings.Async to true if you want to use Async Methods."
Remarks
This is the asynchronous version of WriteDocType, with the same functionality. To use this method, you must set the Async flag to true.
This method stores in the task it returns all non-usage exceptions that the method's synchronous counterpart can throw. If an exception is stored into the returned task, that exception will be thrown when the task is awaited. Usage exceptions, such as ArgumentException, are still thrown synchronously. For the stored exceptions, see the exceptions thrown by WriteDocType(String, String, String, String).
