ExportProvider.GetExportedValue 方法
定义
获取一个导出的对象。Gets an exported object.
重载
| GetExportedValue<T>() |
返回具有从指定的类型参数派生的协定名称的已导出对象。Returns the exported object with the contract name derived from the specified type parameter. 如果不是正好有一个匹配的已导出对象,则将引发异常。If there is not exactly one matching exported object, an exception is thrown. |
| GetExportedValue<T>(String) |
返回具有指定的协定名称的已导出对象。Returns the exported object with the specified contract name. 如果不是正好有一个匹配的已导出对象,则将引发异常。If there is not exactly one matching exported object, an exception is thrown. |
GetExportedValue<T>()
返回具有从指定的类型参数派生的协定名称的已导出对象。Returns the exported object with the contract name derived from the specified type parameter. 如果不是正好有一个匹配的已导出对象,则将引发异常。If there is not exactly one matching exported object, an exception is thrown.
public:
generic <typename T>
T GetExportedValue();
public T GetExportedValue<T> ();
public T? GetExportedValue<T> ();
member this.GetExportedValue : unit -> 'T
Public Function GetExportedValue(Of T) () As T
类型参数
- T
要返回的已导出对象的类型。The type of the exported object to return. 协定名称也派生自此类型参数。The contract name is also derived from this type parameter.
返回
- T
具有从指定的类型参数派生的协定名称的已导出对象。The exported object with the contract name derived from the specified type parameter.
例外
有零个已导出对象具有从 CompositionContainer 中的 T 派生的协定名称。There are zero exported objects with the contract name derived from T in the CompositionContainer.
- 或 --or-
有多个已导出对象具有从 CompositionContainer 中的 T 派生的协定名称。There is more than one exported object with the contract name derived from T in the CompositionContainer.
CompositionContainer 对象已被释放。The CompositionContainer object has been disposed of.
不能将基础导出对象强制转换为 T。The underlying exported object cannot be cast to T.
复合期间发生错误。An error occurred during composition. Errors 将包含所发生错误的集合。Errors will contain a collection of errors that occurred.
注解
协定名称是对调用方法的结果 GetContractName T 。The contract name is the result of calling the GetContractName method on T.
通过使用 Ordinal 属性执行区分大小写的非语言比较,对协定名称进行比较。The contract name is compared by using the Ordinal property to perform a case-sensitive, non-linguistic comparison.
适用于
GetExportedValue<T>(String)
返回具有指定的协定名称的已导出对象。Returns the exported object with the specified contract name. 如果不是正好有一个匹配的已导出对象,则将引发异常。If there is not exactly one matching exported object, an exception is thrown.
public:
generic <typename T>
T GetExportedValue(System::String ^ contractName);
public T GetExportedValue<T> (string contractName);
public T? GetExportedValue<T> (string? contractName);
member this.GetExportedValue : string -> 'T
Public Function GetExportedValue(Of T) (contractName As String) As T
类型参数
- T
要返回的已导出对象的类型。The type of the exported object to return.
参数
- contractName
- String
要返回的已导出对象的协定名称,或者为 null 或空字符串 ("") 以使用默认的协定名称。The contract name of the exported object to return, or null or an empty string ("") to use the default contract name.
返回
- T
具有指定的协定名称的已导出对象。The exported object with the specified contract name.
例外
有零个已导出对象具有从 CompositionContainer 中的 T 派生的协定名称。There are zero exported objects with the contract name derived from T in the CompositionContainer.
- 或 --or-
有多个已导出对象具有从 CompositionContainer 中的 T 派生的协定名称。There is more than one exported object with the contract name derived from T in the CompositionContainer.
CompositionContainer 对象已被释放。The CompositionContainer object has been disposed of.
不能将基础导出对象强制转换为 T。The underlying exported object cannot be cast to T.
复合期间发生错误。An error occurred during composition. Errors 将包含所发生错误的集合。Errors will contain a collection of errors that occurred.
注解
默认协定名称是对调用方法的结果 GetContractName T 。The default contract name is the result of calling the GetContractName method on T.
通过使用 Ordinal 属性执行区分大小写的非语言比较,对协定名称进行比较。The contract name is compared by using the Ordinal property to perform a case-sensitive, non-linguistic comparison.