TaskFactory<TResult>.FromAsync 方法

参考

定义

命名空间:: System.Threading.Tasks

程序集:: System.Threading.Tasks.dll

程序集:: System.Runtime.dll

程序集:: mscorlib.dll

程序集:: netstandard.dll

重要

一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。

创建一个任务实例。

重载

FromAsync(IAsyncResult, Func<IAsyncResult,TResult>)	创建一个任务，它在指定的 IAsyncResult 完成时执行一个结束方法函数。
FromAsync(Func<AsyncCallback,Object,IAsyncResult>, Func<IAsyncResult,TResult>, Object)	创建一个任务，它表示符合异步编程模型模式的成对的开始和结束方法。
FromAsync(IAsyncResult, Func<IAsyncResult,TResult>, TaskCreationOptions)	创建一个任务，它在指定的 IAsyncResult 完成时执行一个结束方法函数。
FromAsync(Func<AsyncCallback,Object,IAsyncResult>, Func<IAsyncResult,TResult>, Object, TaskCreationOptions)	创建一个任务，它表示符合异步编程模型模式的成对的开始和结束方法。
FromAsync(IAsyncResult, Func<IAsyncResult,TResult>, TaskCreationOptions, TaskScheduler)	创建一个任务，它在指定的 IAsyncResult 完成时执行一个结束方法函数。
FromAsync<TArg1,TArg2,TArg3>(Func<TArg1,TArg2,TArg3,AsyncCallback, Object,IAsyncResult>, Func<IAsyncResult,TResult>, TArg1, TArg2, TArg3, Object, TaskCreationOptions)	创建一个任务，它表示符合异步编程模型模式的成对的开始和结束方法。
FromAsync<TArg1,TArg2,TArg3>(Func<TArg1,TArg2,TArg3,AsyncCallback,Object,IAsyncResult>, Func<IAsyncResult,TResult>, TArg1, TArg2, TArg3, Object)	创建一个任务，它表示符合异步编程模型模式的成对的开始和结束方法。
FromAsync<TArg1,TArg2>(Func<TArg1,TArg2,AsyncCallback,Object,IAsyncResult>, Func<IAsyncResult,TResult>, TArg1, TArg2, Object, TaskCreationOptions)	创建一个任务，它表示符合异步编程模型模式的成对的开始和结束方法。
FromAsync<TArg1,TArg2>(Func<TArg1,TArg2,AsyncCallback,Object,IAsyncResult>, Func<IAsyncResult,TResult>, TArg1, TArg2, Object)	创建一个任务，它表示符合异步编程模型模式的成对的开始和结束方法。
FromAsync<TArg1>(Func<TArg1,AsyncCallback,Object,IAsyncResult>, Func<IAsyncResult,TResult>, TArg1, Object)	创建一个任务，它表示符合异步编程模型模式的成对的开始和结束方法。
FromAsync<TArg1>(Func<TArg1,AsyncCallback,Object,IAsyncResult>, Func<IAsyncResult,TResult>, TArg1, Object, TaskCreationOptions)	创建一个任务，它表示符合异步编程模型模式的成对的开始和结束方法。

FromAsync(IAsyncResult, Func<IAsyncResult,TResult>)

Source:: FutureFactory.cs

Source:: FutureFactory.cs

Source:: FutureFactory.cs

创建一个任务，它在指定的 IAsyncResult 完成时执行一个结束方法函数。

public:
 System::Threading::Tasks::Task<TResult> ^ FromAsync(IAsyncResult ^ asyncResult, Func<IAsyncResult ^, TResult> ^ endMethod);

public System.Threading.Tasks.Task<TResult> FromAsync (IAsyncResult asyncResult, Func<IAsyncResult,TResult> endMethod);

member this.FromAsync : IAsyncResult * Func<IAsyncResult, 'Result> -> System.Threading.Tasks.Task<'Result>

Public Function FromAsync (asyncResult As IAsyncResult, endMethod As Func(Of IAsyncResult, TResult)) As Task(Of TResult)

参数

asyncResult: IAsyncResult

IAsyncResult，完成它时将触发对 endMethod 的处理。

endMethod: Func<IAsyncResult,TResult>

用于处理完成的 asyncResult 的函数委托。

Task<TResult>

表示异步操作的 Task<TResult>。

例外

ArgumentNullException

asyncResult 参数为 null。

- 或 -

endMethod 参数为 null。

另请参阅

适用于

FromAsync(Func<AsyncCallback,Object,IAsyncResult>, Func<IAsyncResult,TResult>, Object)

Source:: FutureFactory.cs

Source:: FutureFactory.cs

Source:: FutureFactory.cs

创建一个任务，它表示符合异步编程模型模式的成对的开始和结束方法。

public:
 System::Threading::Tasks::Task<TResult> ^ FromAsync(Func<AsyncCallback ^, System::Object ^, IAsyncResult ^> ^ beginMethod, Func<IAsyncResult ^, TResult> ^ endMethod, System::Object ^ state);

public System.Threading.Tasks.Task<TResult> FromAsync (Func<AsyncCallback,object,IAsyncResult> beginMethod, Func<IAsyncResult,TResult> endMethod, object state);

public System.Threading.Tasks.Task<TResult> FromAsync (Func<AsyncCallback,object?,IAsyncResult> beginMethod, Func<IAsyncResult,TResult> endMethod, object? state);

member this.FromAsync : Func<AsyncCallback, obj, IAsyncResult> * Func<IAsyncResult, 'Result> * obj -> System.Threading.Tasks.Task<'Result>

Public Function FromAsync (beginMethod As Func(Of AsyncCallback, Object, IAsyncResult), endMethod As Func(Of IAsyncResult, TResult), state As Object) As Task(Of TResult)

参数

beginMethod: Func<AsyncCallback,Object,IAsyncResult>

用于启动异步操作的委托。

endMethod: Func<IAsyncResult,TResult>

用于结束异步操作的委托。

state: Object

一个包含由 beginMethod 委托使用的数据的对象。

Task<TResult>

创建的表示异步操作的任务。

例外

ArgumentNullException

beginMethod 参数为 null。

- 或 -

endMethod 参数为 null。

注解

此方法引发由 beginMethod引发的任何异常。 endmethod等待返回的任务时，会引发异常。

另请参阅

适用于

FromAsync(IAsyncResult, Func<IAsyncResult,TResult>, TaskCreationOptions)

Source:: FutureFactory.cs

Source:: FutureFactory.cs

Source:: FutureFactory.cs

创建一个任务，它在指定的 IAsyncResult 完成时执行一个结束方法函数。

public:
 System::Threading::Tasks::Task<TResult> ^ FromAsync(IAsyncResult ^ asyncResult, Func<IAsyncResult ^, TResult> ^ endMethod, System::Threading::Tasks::TaskCreationOptions creationOptions);

public System.Threading.Tasks.Task<TResult> FromAsync (IAsyncResult asyncResult, Func<IAsyncResult,TResult> endMethod, System.Threading.Tasks.TaskCreationOptions creationOptions);

member this.FromAsync : IAsyncResult * Func<IAsyncResult, 'Result> * System.Threading.Tasks.TaskCreationOptions -> System.Threading.Tasks.Task<'Result>

Public Function FromAsync (asyncResult As IAsyncResult, endMethod As Func(Of IAsyncResult, TResult), creationOptions As TaskCreationOptions) As Task(Of TResult)

参数

asyncResult: IAsyncResult

IAsyncResult，完成它时将触发对 endMethod 的处理。

endMethod: Func<IAsyncResult,TResult>

用于处理完成的 asyncResult 的函数委托。

creationOptions: TaskCreationOptions

控制所创建的任务的行为的枚举值之一。

Task<TResult>

表示异步操作的任务。

例外

ArgumentNullException

asyncResult 参数为 null。

- 或 -

endMethod 参数为 null。

ArgumentOutOfRangeException

creationOptions 参数指定的值无效。

另请参阅

适用于

FromAsync(Func<AsyncCallback,Object,IAsyncResult>, Func<IAsyncResult,TResult>, Object, TaskCreationOptions)

Source:: FutureFactory.cs

Source:: FutureFactory.cs

Source:: FutureFactory.cs

创建一个任务，它表示符合异步编程模型模式的成对的开始和结束方法。

public:
 System::Threading::Tasks::Task<TResult> ^ FromAsync(Func<AsyncCallback ^, System::Object ^, IAsyncResult ^> ^ beginMethod, Func<IAsyncResult ^, TResult> ^ endMethod, System::Object ^ state, System::Threading::Tasks::TaskCreationOptions creationOptions);

public System.Threading.Tasks.Task<TResult> FromAsync (Func<AsyncCallback,object,IAsyncResult> beginMethod, Func<IAsyncResult,TResult> endMethod, object state, System.Threading.Tasks.TaskCreationOptions creationOptions);

public System.Threading.Tasks.Task<TResult> FromAsync (Func<AsyncCallback,object?,IAsyncResult> beginMethod, Func<IAsyncResult,TResult> endMethod, object? state, System.Threading.Tasks.TaskCreationOptions creationOptions);

member this.FromAsync : Func<AsyncCallback, obj, IAsyncResult> * Func<IAsyncResult, 'Result> * obj * System.Threading.Tasks.TaskCreationOptions -> System.Threading.Tasks.Task<'Result>

Public Function FromAsync (beginMethod As Func(Of AsyncCallback, Object, IAsyncResult), endMethod As Func(Of IAsyncResult, TResult), state As Object, creationOptions As TaskCreationOptions) As Task(Of TResult)

参数

beginMethod: Func<AsyncCallback,Object,IAsyncResult>

用于启动异步操作的委托。

endMethod: Func<IAsyncResult,TResult>

用于结束异步操作的委托。

state: Object

一个包含由 beginMethod 委托使用的数据的对象。

creationOptions: TaskCreationOptions

控制所创建的任务的行为的枚举值之一。

Task<TResult>

创建的表示异步操作的 Task<TResult>。

例外

ArgumentNullException

beginMethod 参数为 null。

- 或 -

endMethod 参数为 null。

ArgumentOutOfRangeException

creationOptions 参数指定的值无效。

注解

此方法引发由 beginMethod引发的任何异常。 endmethod等待返回的任务时，会引发异常。

另请参阅

适用于

FromAsync(IAsyncResult, Func<IAsyncResult,TResult>, TaskCreationOptions, TaskScheduler)

Source:: FutureFactory.cs

Source:: FutureFactory.cs

Source:: FutureFactory.cs

创建一个任务，它在指定的 IAsyncResult 完成时执行一个结束方法函数。

public:
 System::Threading::Tasks::Task<TResult> ^ FromAsync(IAsyncResult ^ asyncResult, Func<IAsyncResult ^, TResult> ^ endMethod, System::Threading::Tasks::TaskCreationOptions creationOptions, System::Threading::Tasks::TaskScheduler ^ scheduler);

public System.Threading.Tasks.Task<TResult> FromAsync (IAsyncResult asyncResult, Func<IAsyncResult,TResult> endMethod, System.Threading.Tasks.TaskCreationOptions creationOptions, System.Threading.Tasks.TaskScheduler scheduler);

member this.FromAsync : IAsyncResult * Func<IAsyncResult, 'Result> * System.Threading.Tasks.TaskCreationOptions * System.Threading.Tasks.TaskScheduler -> System.Threading.Tasks.Task<'Result>

Public Function FromAsync (asyncResult As IAsyncResult, endMethod As Func(Of IAsyncResult, TResult), creationOptions As TaskCreationOptions, scheduler As TaskScheduler) As Task(Of TResult)

参数

asyncResult: IAsyncResult

IAsyncResult，完成它时将触发对 endMethod 的处理。

endMethod: Func<IAsyncResult,TResult>

用于处理完成的 asyncResult 的函数委托。

creationOptions: TaskCreationOptions

控制所创建的任务的行为的枚举值之一。

scheduler: TaskScheduler

用于计划将执行结束方法的任务计划程序。

Task<TResult>

创建的表示异步操作的任务。

例外

ArgumentNullException

asyncResult 参数为 null。

- 或 -

endMethod 参数为 null。

- 或 -

scheduler 参数为 null。

ArgumentOutOfRangeException

creationOptions 参数指定的值无效。

另请参阅

适用于

FromAsync<TArg1,TArg2,TArg3>(Func<TArg1,TArg2,TArg3,AsyncCallback, Object,IAsyncResult>, Func<IAsyncResult,TResult>, TArg1, TArg2, TArg3, Object, TaskCreationOptions)

Source:: FutureFactory.cs

Source:: FutureFactory.cs

Source:: FutureFactory.cs

创建一个任务，它表示符合异步编程模型模式的成对的开始和结束方法。

public:
generic <typename TArg1, typename TArg2, typename TArg3>
 System::Threading::Tasks::Task<TResult> ^ FromAsync(Func<TArg1, TArg2, TArg3, AsyncCallback ^, System::Object ^, IAsyncResult ^> ^ beginMethod, Func<IAsyncResult ^, TResult> ^ endMethod, TArg1 arg1, TArg2 arg2, TArg3 arg3, System::Object ^ state, System::Threading::Tasks::TaskCreationOptions creationOptions);

public System.Threading.Tasks.Task<TResult> FromAsync<TArg1,TArg2,TArg3> (Func<TArg1,TArg2,TArg3,AsyncCallback,object,IAsyncResult> beginMethod, Func<IAsyncResult,TResult> endMethod, TArg1 arg1, TArg2 arg2, TArg3 arg3, object state, System.Threading.Tasks.TaskCreationOptions creationOptions);

public System.Threading.Tasks.Task<TResult> FromAsync<TArg1,TArg2,TArg3> (Func<TArg1,TArg2,TArg3,AsyncCallback,object?,IAsyncResult> beginMethod, Func<IAsyncResult,TResult> endMethod, TArg1 arg1, TArg2 arg2, TArg3 arg3, object? state, System.Threading.Tasks.TaskCreationOptions creationOptions);

member this.FromAsync : Func<'TArg1, 'TArg2, 'TArg3, AsyncCallback, obj, IAsyncResult> * Func<IAsyncResult, 'Result> * 'TArg1 * 'TArg2 * 'TArg3 * obj * System.Threading.Tasks.TaskCreationOptions -> System.Threading.Tasks.Task<'Result>

Public Function FromAsync(Of TArg1, TArg2, TArg3) (beginMethod As Func(Of TArg1, TArg2, TArg3, AsyncCallback, Object, IAsyncResult), endMethod As Func(Of IAsyncResult, TResult), arg1 As TArg1, arg2 As TArg2, arg3 As TArg3, state As Object, creationOptions As TaskCreationOptions) As Task(Of TResult)

类型参数

TArg1

传递给 beginMethod 委托的第二个自变量的类型。

TArg2

传递给 beginMethod 委托的第三个参数的类型。

TArg3

传递给 beginMethod 委托的第一个自变量的类型。

参数

beginMethod: Func<TArg1,TArg2,TArg3,AsyncCallback,Object,IAsyncResult>

用于启动异步操作的委托。

endMethod: Func<IAsyncResult,TResult>

用于结束异步操作的委托。

arg1: TArg1

传递给 beginMethod 委托的第一个参数。

arg2: TArg2

传递给 beginMethod 委托的第二个自变量。

arg3: TArg3

传递给 beginMethod 委托的第三个参数。

state: Object

一个包含由 beginMethod 委托使用的数据的对象。

creationOptions: TaskCreationOptions

一个对象，用于控制所创建的任务的行为。

Task<TResult>

创建的表示异步操作的任务。

例外

ArgumentNullException

beginMethod 参数为 null。

- 或 -

endMethod 参数为 null。

ArgumentOutOfRangeException

creationOptions 参数指定的值无效。

注解

此方法引发由 beginMethod引发的任何异常。 endmethod等待返回的任务时，会引发异常。

另请参阅

适用于

FromAsync<TArg1,TArg2,TArg3>(Func<TArg1,TArg2,TArg3,AsyncCallback,Object,IAsyncResult>, Func<IAsyncResult,TResult>, TArg1, TArg2, TArg3, Object)

Source:: FutureFactory.cs

Source:: FutureFactory.cs

Source:: FutureFactory.cs

创建一个任务，它表示符合异步编程模型模式的成对的开始和结束方法。

public:
generic <typename TArg1, typename TArg2, typename TArg3>
 System::Threading::Tasks::Task<TResult> ^ FromAsync(Func<TArg1, TArg2, TArg3, AsyncCallback ^, System::Object ^, IAsyncResult ^> ^ beginMethod, Func<IAsyncResult ^, TResult> ^ endMethod, TArg1 arg1, TArg2 arg2, TArg3 arg3, System::Object ^ state);

public System.Threading.Tasks.Task<TResult> FromAsync<TArg1,TArg2,TArg3> (Func<TArg1,TArg2,TArg3,AsyncCallback,object,IAsyncResult> beginMethod, Func<IAsyncResult,TResult> endMethod, TArg1 arg1, TArg2 arg2, TArg3 arg3, object state);

public System.Threading.Tasks.Task<TResult> FromAsync<TArg1,TArg2,TArg3> (Func<TArg1,TArg2,TArg3,AsyncCallback,object?,IAsyncResult> beginMethod, Func<IAsyncResult,TResult> endMethod, TArg1 arg1, TArg2 arg2, TArg3 arg3, object? state);

member this.FromAsync : Func<'TArg1, 'TArg2, 'TArg3, AsyncCallback, obj, IAsyncResult> * Func<IAsyncResult, 'Result> * 'TArg1 * 'TArg2 * 'TArg3 * obj -> System.Threading.Tasks.Task<'Result>

Public Function FromAsync(Of TArg1, TArg2, TArg3) (beginMethod As Func(Of TArg1, TArg2, TArg3, AsyncCallback, Object, IAsyncResult), endMethod As Func(Of IAsyncResult, TResult), arg1 As TArg1, arg2 As TArg2, arg3 As TArg3, state As Object) As Task(Of TResult)

类型参数

TArg1

传递给 beginMethod 委托的第二个自变量的类型。

TArg2

传递给 beginMethod 委托的第三个参数的类型。

TArg3

传递给 beginMethod 委托的第一个自变量的类型。

参数

beginMethod: Func<TArg1,TArg2,TArg3,AsyncCallback,Object,IAsyncResult>

用于启动异步操作的委托。

endMethod: Func<IAsyncResult,TResult>

用于结束异步操作的委托。

arg1: TArg1

传递给 beginMethod 委托的第一个参数。

arg2: TArg2

传递给 beginMethod 委托的第二个自变量。

arg3: TArg3

传递给 beginMethod 委托的第三个参数。

state: Object

一个包含由 beginMethod 委托使用的数据的对象。

Task<TResult>

创建的表示异步操作的任务。

例外

ArgumentNullException

beginMethod 参数为 null。

- 或 -

endMethod 参数为 null。

注解

此方法引发由 beginMethod引发的任何异常。 endmethod在等待返回的任务时，会引发异常。

另请参阅

适用于

FromAsync<TArg1,TArg2>(Func<TArg1,TArg2,AsyncCallback,Object,IAsyncResult>, Func<IAsyncResult,TResult>, TArg1, TArg2, Object, TaskCreationOptions)

Source:: FutureFactory.cs

Source:: FutureFactory.cs

Source:: FutureFactory.cs

创建一个任务，它表示符合异步编程模型模式的成对的开始和结束方法。

public:
generic <typename TArg1, typename TArg2>
 System::Threading::Tasks::Task<TResult> ^ FromAsync(Func<TArg1, TArg2, AsyncCallback ^, System::Object ^, IAsyncResult ^> ^ beginMethod, Func<IAsyncResult ^, TResult> ^ endMethod, TArg1 arg1, TArg2 arg2, System::Object ^ state, System::Threading::Tasks::TaskCreationOptions creationOptions);

public System.Threading.Tasks.Task<TResult> FromAsync<TArg1,TArg2> (Func<TArg1,TArg2,AsyncCallback,object,IAsyncResult> beginMethod, Func<IAsyncResult,TResult> endMethod, TArg1 arg1, TArg2 arg2, object state, System.Threading.Tasks.TaskCreationOptions creationOptions);

public System.Threading.Tasks.Task<TResult> FromAsync<TArg1,TArg2> (Func<TArg1,TArg2,AsyncCallback,object?,IAsyncResult> beginMethod, Func<IAsyncResult,TResult> endMethod, TArg1 arg1, TArg2 arg2, object? state, System.Threading.Tasks.TaskCreationOptions creationOptions);

member this.FromAsync : Func<'TArg1, 'TArg2, AsyncCallback, obj, IAsyncResult> * Func<IAsyncResult, 'Result> * 'TArg1 * 'TArg2 * obj * System.Threading.Tasks.TaskCreationOptions -> System.Threading.Tasks.Task<'Result>

Public Function FromAsync(Of TArg1, TArg2) (beginMethod As Func(Of TArg1, TArg2, AsyncCallback, Object, IAsyncResult), endMethod As Func(Of IAsyncResult, TResult), arg1 As TArg1, arg2 As TArg2, state As Object, creationOptions As TaskCreationOptions) As Task(Of TResult)

类型参数

TArg1

传递给 beginMethod 委托的第二个自变量的类型。

TArg2

传递给 beginMethod 委托的第一个自变量的类型。

参数

beginMethod: Func<TArg1,TArg2,AsyncCallback,Object,IAsyncResult>

用于启动异步操作的委托。

endMethod: Func<IAsyncResult,TResult>

用于结束异步操作的委托。

arg1: TArg1

传递给 beginMethod 委托的第一个参数。

arg2: TArg2

传递给 beginMethod 委托的第二个自变量。

state: Object

一个包含由 beginMethod 委托使用的数据的对象。

creationOptions: TaskCreationOptions

一个对象，用于控制所创建的 Task<TResult> 的行为。

Task<TResult>

创建的表示异步操作的任务。

例外

ArgumentNullException

beginMethod 参数为 null。

- 或 -

endMethod 参数为 null。

ArgumentOutOfRangeException

creationOptions 参数指定的值无效。

注解

此方法引发由 beginMethod引发的任何异常。 endmethod在等待返回的任务时，会引发异常。

另请参阅

适用于

FromAsync<TArg1,TArg2>(Func<TArg1,TArg2,AsyncCallback,Object,IAsyncResult>, Func<IAsyncResult,TResult>, TArg1, TArg2, Object)

Source:: FutureFactory.cs

Source:: FutureFactory.cs

Source:: FutureFactory.cs

创建一个任务，它表示符合异步编程模型模式的成对的开始和结束方法。

public:
generic <typename TArg1, typename TArg2>
 System::Threading::Tasks::Task<TResult> ^ FromAsync(Func<TArg1, TArg2, AsyncCallback ^, System::Object ^, IAsyncResult ^> ^ beginMethod, Func<IAsyncResult ^, TResult> ^ endMethod, TArg1 arg1, TArg2 arg2, System::Object ^ state);

public System.Threading.Tasks.Task<TResult> FromAsync<TArg1,TArg2> (Func<TArg1,TArg2,AsyncCallback,object,IAsyncResult> beginMethod, Func<IAsyncResult,TResult> endMethod, TArg1 arg1, TArg2 arg2, object state);

public System.Threading.Tasks.Task<TResult> FromAsync<TArg1,TArg2> (Func<TArg1,TArg2,AsyncCallback,object?,IAsyncResult> beginMethod, Func<IAsyncResult,TResult> endMethod, TArg1 arg1, TArg2 arg2, object? state);

member this.FromAsync : Func<'TArg1, 'TArg2, AsyncCallback, obj, IAsyncResult> * Func<IAsyncResult, 'Result> * 'TArg1 * 'TArg2 * obj -> System.Threading.Tasks.Task<'Result>

Public Function FromAsync(Of TArg1, TArg2) (beginMethod As Func(Of TArg1, TArg2, AsyncCallback, Object, IAsyncResult), endMethod As Func(Of IAsyncResult, TResult), arg1 As TArg1, arg2 As TArg2, state As Object) As Task(Of TResult)

类型参数

TArg1

传递给 beginMethod 委托的第二个自变量的类型。

TArg2

传递给 beginMethod 委托的第一个自变量的类型。

参数

beginMethod: Func<TArg1,TArg2,AsyncCallback,Object,IAsyncResult>

用于启动异步操作的委托。

endMethod: Func<IAsyncResult,TResult>

用于结束异步操作的委托。

arg1: TArg1

传递给 beginMethod 委托的第一个参数。

arg2: TArg2

传递给 beginMethod 委托的第二个自变量。

state: Object

一个包含由 beginMethod 委托使用的数据的对象。

Task<TResult>

创建的表示异步操作的任务。

例外

ArgumentNullException

beginMethod 参数为 null。

- 或 -

endMethod 参数为 null。

注解

此方法引发由 beginMethod引发的任何异常。 endmethod在等待返回的任务时，会引发异常。

另请参阅

适用于

FromAsync<TArg1>(Func<TArg1,AsyncCallback,Object,IAsyncResult>, Func<IAsyncResult,TResult>, TArg1, Object)

Source:: FutureFactory.cs

Source:: FutureFactory.cs

Source:: FutureFactory.cs

创建一个任务，它表示符合异步编程模型模式的成对的开始和结束方法。

public:
generic <typename TArg1>
 System::Threading::Tasks::Task<TResult> ^ FromAsync(Func<TArg1, AsyncCallback ^, System::Object ^, IAsyncResult ^> ^ beginMethod, Func<IAsyncResult ^, TResult> ^ endMethod, TArg1 arg1, System::Object ^ state);

public System.Threading.Tasks.Task<TResult> FromAsync<TArg1> (Func<TArg1,AsyncCallback,object,IAsyncResult> beginMethod, Func<IAsyncResult,TResult> endMethod, TArg1 arg1, object state);

public System.Threading.Tasks.Task<TResult> FromAsync<TArg1> (Func<TArg1,AsyncCallback,object?,IAsyncResult> beginMethod, Func<IAsyncResult,TResult> endMethod, TArg1 arg1, object? state);

member this.FromAsync : Func<'TArg1, AsyncCallback, obj, IAsyncResult> * Func<IAsyncResult, 'Result> * 'TArg1 * obj -> System.Threading.Tasks.Task<'Result>

Public Function FromAsync(Of TArg1) (beginMethod As Func(Of TArg1, AsyncCallback, Object, IAsyncResult), endMethod As Func(Of IAsyncResult, TResult), arg1 As TArg1, state As Object) As Task(Of TResult)

类型参数

TArg1

传递给 beginMethod 委托的第一个自变量的类型。

参数

beginMethod: Func<TArg1,AsyncCallback,Object,IAsyncResult>

用于启动异步操作的委托。

endMethod: Func<IAsyncResult,TResult>

用于结束异步操作的委托。

arg1: TArg1

传递给 beginMethod 委托的第一个自变量。

state: Object

一个包含由 beginMethod 委托使用的数据的对象。

Task<TResult>

创建的表示异步操作的任务。

例外

ArgumentNullException

beginMethod 参数为 null。

- 或 -

endMethod 参数为 null。

注解

此方法引发由 beginMethod引发的任何异常。 endmethod在等待返回的任务时，会引发异常。

另请参阅

适用于

FromAsync<TArg1>(Func<TArg1,AsyncCallback,Object,IAsyncResult>, Func<IAsyncResult,TResult>, TArg1, Object, TaskCreationOptions)

Source:: FutureFactory.cs

Source:: FutureFactory.cs

Source:: FutureFactory.cs

创建一个任务，它表示符合异步编程模型模式的成对的开始和结束方法。

public:
generic <typename TArg1>
 System::Threading::Tasks::Task<TResult> ^ FromAsync(Func<TArg1, AsyncCallback ^, System::Object ^, IAsyncResult ^> ^ beginMethod, Func<IAsyncResult ^, TResult> ^ endMethod, TArg1 arg1, System::Object ^ state, System::Threading::Tasks::TaskCreationOptions creationOptions);

public System.Threading.Tasks.Task<TResult> FromAsync<TArg1> (Func<TArg1,AsyncCallback,object,IAsyncResult> beginMethod, Func<IAsyncResult,TResult> endMethod, TArg1 arg1, object state, System.Threading.Tasks.TaskCreationOptions creationOptions);

public System.Threading.Tasks.Task<TResult> FromAsync<TArg1> (Func<TArg1,AsyncCallback,object?,IAsyncResult> beginMethod, Func<IAsyncResult,TResult> endMethod, TArg1 arg1, object? state, System.Threading.Tasks.TaskCreationOptions creationOptions);

member this.FromAsync : Func<'TArg1, AsyncCallback, obj, IAsyncResult> * Func<IAsyncResult, 'Result> * 'TArg1 * obj * System.Threading.Tasks.TaskCreationOptions -> System.Threading.Tasks.Task<'Result>

Public Function FromAsync(Of TArg1) (beginMethod As Func(Of TArg1, AsyncCallback, Object, IAsyncResult), endMethod As Func(Of IAsyncResult, TResult), arg1 As TArg1, state As Object, creationOptions As TaskCreationOptions) As Task(Of TResult)