CompiledQuery.Compile<TArg0, TResult> 方法 (Expression<Func<TArg0, TResult>>)
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创建一个表示已编译的 LINQ to Entities 查询的新委托。
命名空间： System.Data.Entity.Core.Objects
程序集： EntityFramework（在 EntityFramework.dll 中）
语法
声明
<SuppressMessageAttribute("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")> _
<SuppressMessageAttribute("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters", Justification := "required for this feature")> _
Public Shared Function Compile(Of TArg0 As ObjectContext, TResult) ( _
query As Expression(Of Func(Of TArg0, TResult)) _
) As Func(Of TArg0, TResult)
用法
Dim query As Expression(Of Func(Of TArg0, TResult))
Dim returnValue As Func(Of TArg0, TResult)
returnValue = CompiledQuery.Compile(query)
[SuppressMessageAttribute("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
[SuppressMessageAttribute("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters", Justification = "required for this feature")]
public static Func<TArg0, TResult> Compile<TArg0, TResult>(
Expression<Func<TArg0, TResult>> query
)
where TArg0 : ObjectContext
[SuppressMessageAttribute(L"Microsoft.Design", L"CA1006:DoNotNestGenericTypesInMemberSignatures")]
[SuppressMessageAttribute(L"Microsoft.Design", L"CA1011:ConsiderPassingBaseTypesAsParameters", Justification = L"required for this feature")]
public:
generic<typename TArg0, typename TResult>
where TArg0 : ObjectContext
static Func<TArg0, TResult>^ Compile(
Expression<Func<TArg0, TResult>^>^ query
)
[<SuppressMessageAttribute("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")>]
[<SuppressMessageAttribute("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters", Justification = "required for this feature")>]
static member Compile :
query:Expression<Func<'TArg0, 'TResult>> -> Func<'TArg0, 'TResult> when 'TArg0 : ObjectContext
JScript does not support generic types and methods.
类型参数
- TArg0
由 ObjectContext 派生的类型。
- TResult
通过执行由 Compile<TArg0, TResult>(Expression<Func<TArg0, TResult>>) 方法返回的委托所返回的查询结果的类型 T。
参数
- query
类型：System.Linq.Expressions.Expression<Func<TArg0, TResult>>
要编译的 lambda 表达式。
返回值
类型：System.Func<TArg0, TResult>
Func<T, TResult> ，这是一个表示已编译的 LINQ to Entities 查询的泛型委托。