DbExpressionBuilder.Navigate 方法

定義

命名空間:: System.Data.Common.CommandTrees.ExpressionBuilder

組件:: System.Data.Entity.dll

重要

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建立 DbRelationshipNavigationExpression 一個代表文章或關聯關係導航的新內容。

多載

名稱	Description
Navigate(DbExpression, RelationshipEndMember, RelationshipEndMember)	建立 DbRelationshipNavigationExpression 一個代表文章或關聯關係導航的新內容。
Navigate(RelationshipType, String, String, DbExpression)	建立 DbRelationshipNavigationExpression 一個代表文章或關聯關係導航的新內容。

Navigate(DbExpression, RelationshipEndMember, RelationshipEndMember)

建立 DbRelationshipNavigationExpression 一個代表文章或關聯關係導航的新內容。

public:
[System::Runtime::CompilerServices::Extension]
 static System::Data::Common::CommandTrees::DbRelationshipNavigationExpression ^ Navigate(System::Data::Common::CommandTrees::DbExpression ^ navigateFrom, System::Data::Metadata::Edm::RelationshipEndMember ^ fromEnd, System::Data::Metadata::Edm::RelationshipEndMember ^ toEnd);

public static System.Data.Common.CommandTrees.DbRelationshipNavigationExpression Navigate(this System.Data.Common.CommandTrees.DbExpression navigateFrom, System.Data.Metadata.Edm.RelationshipEndMember fromEnd, System.Data.Metadata.Edm.RelationshipEndMember toEnd);

static member Navigate : System.Data.Common.CommandTrees.DbExpression * System.Data.Metadata.Edm.RelationshipEndMember * System.Data.Metadata.Edm.RelationshipEndMember -> System.Data.Common.CommandTrees.DbRelationshipNavigationExpression

<Extension()>
Public Function Navigate (navigateFrom As DbExpression, fromEnd As RelationshipEndMember, toEnd As RelationshipEndMember) As DbRelationshipNavigationExpression

參數

navigateFrom: DbExpression

一個表達式，指定導航應從哪個實例進行。

fromEnd: RelationshipEndMember

代表導航應從中斷關係的屬性元資料。

toEnd: RelationshipEndMember

代表導航應該進行的關係結束的屬性的元資料。

傳回

DbRelationshipNavigationExpression

一個新的 DbRelationshipNavigationExpression，代表指定關聯類型中，從指定導航來源實例中，對指定關係類型的 from（from）與 to （to）關係端的導航。

例外狀況

ArgumentNullException

fromEnd，或 toEndnavigateFrom 為零。

ArgumentException

fromEnd 與 toEnd 並非以相同關係型態宣告，或 navigateFrom 其結果型別與的 fromEnd性質型別不相容。

備註

DbRelationshipNavigationExpression 要求導航必須始終從參考開始，因此 navigateFrom 必須始終有參考結果類型。

適用於

Navigate(RelationshipType, String, String, DbExpression)

建立 DbRelationshipNavigationExpression 一個代表文章或關聯關係導航的新內容。

public:
[System::Runtime::CompilerServices::Extension]
 static System::Data::Common::CommandTrees::DbRelationshipNavigationExpression ^ Navigate(System::Data::Metadata::Edm::RelationshipType ^ type, System::String ^ fromEndName, System::String ^ toEndName, System::Data::Common::CommandTrees::DbExpression ^ navigateFrom);

public static System.Data.Common.CommandTrees.DbRelationshipNavigationExpression Navigate(this System.Data.Metadata.Edm.RelationshipType type, string fromEndName, string toEndName, System.Data.Common.CommandTrees.DbExpression navigateFrom);

static member Navigate : System.Data.Metadata.Edm.RelationshipType * string * string * System.Data.Common.CommandTrees.DbExpression -> System.Data.Common.CommandTrees.DbRelationshipNavigationExpression

<Extension()>
Public Function Navigate (type As RelationshipType, fromEndName As String, toEndName As String, navigateFrom As DbExpression) As DbRelationshipNavigationExpression