SqlExpressionFactory.NiladicFunction 方法

定义

命名空间:: Microsoft.EntityFrameworkCore.Query

程序集:: Microsoft.EntityFrameworkCore.Relational.dll

程序包:: Microsoft.EntityFrameworkCore.Relational v10.0.0

程序包:: Microsoft.EntityFrameworkCore.Relational v11.0.0

程序包:: Microsoft.EntityFrameworkCore.Relational v5.0.0

程序包:: Microsoft.EntityFrameworkCore.Relational v6.0.0

程序包:: Microsoft.EntityFrameworkCore.Relational v7.0.0

程序包:: Microsoft.EntityFrameworkCore.Relational v8.0.0

程序包:: Microsoft.EntityFrameworkCore.Relational v9.0.0

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。

重载

名称	说明
NiladicFunction(String, Boolean, Type, RelationalTypeMapping)	创建一个新 SqlExpression 值，表示 SQL 树中的 niladic 函数调用。
NiladicFunction(String, String, Boolean, Type, RelationalTypeMapping)	创建一个新 SqlExpression 值，表示 SQL 树中的 niladic 函数调用。
NiladicFunction(SqlExpression, String, Boolean, Boolean, Type, RelationalTypeMapping)	创建一个新 SqlExpression 值，表示 SQL 树中的 niladic 函数调用。

NiladicFunction(String, Boolean, Type, RelationalTypeMapping)

Source:: SqlExpressionFactory.cs

Source:: SqlExpressionFactory.cs

Source:: SqlExpressionFactory.cs

Source:: SqlExpressionFactory.cs

Source:: SqlExpressionFactory.cs

Source:: SqlExpressionFactory.cs

Source:: SqlExpressionFactory.cs

创建一个新 SqlExpression 值，表示 SQL 树中的 niladic 函数调用。

public virtual Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression NiladicFunction(string name, bool nullable, Type returnType, Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping? typeMapping = default);

public virtual Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlFunctionExpression NiladicFunction(string name, bool nullable, Type returnType, Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping typeMapping = default);

public virtual Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlFunctionExpression NiladicFunction(string name, bool nullable, Type returnType, Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping? typeMapping = default);

abstract member NiladicFunction : string * bool * Type * Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping -> Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression
override this.NiladicFunction : string * bool * Type * Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping -> Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression

abstract member NiladicFunction : string * bool * Type * Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping -> Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlFunctionExpression
override this.NiladicFunction : string * bool * Type * Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping -> Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlFunctionExpression

Public Overridable Function NiladicFunction (name As String, nullable As Boolean, returnType As Type, Optional typeMapping As RelationalTypeMapping = Nothing) As SqlExpression

Public Overridable Function NiladicFunction (name As String, nullable As Boolean, returnType As Type, Optional typeMapping As RelationalTypeMapping = Nothing) As SqlFunctionExpression

参数

name: String

函数的名称。

nullable: Boolean

一个布尔值，该值指示此函数是否可以返回 null。

returnType: Type

Type表达式。

typeMapping: RelationalTypeMapping

与 RelationalTypeMapping 表达式关联的表达式。

SqlExpression

SqlFunctionExpression

表示 SQL 树中的函数调用的表达式。

实现

NiladicFunction(String, Boolean, Type, RelationalTypeMapping)

适用于

NiladicFunction(String, String, Boolean, Type, RelationalTypeMapping)

Source:: SqlExpressionFactory.cs

Source:: SqlExpressionFactory.cs

Source:: SqlExpressionFactory.cs

Source:: SqlExpressionFactory.cs

Source:: SqlExpressionFactory.cs

Source:: SqlExpressionFactory.cs

Source:: SqlExpressionFactory.cs

创建一个新 SqlExpression 值，表示 SQL 树中的 niladic 函数调用。

public virtual Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression NiladicFunction(string schema, string name, bool nullable, Type returnType, Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping? typeMapping = default);

public virtual Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlFunctionExpression NiladicFunction(string schema, string name, bool nullable, Type returnType, Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping typeMapping = default);

public virtual Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlFunctionExpression NiladicFunction(string schema, string name, bool nullable, Type returnType, Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping? typeMapping = default);

abstract member NiladicFunction : string * string * bool * Type * Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping -> Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression
override this.NiladicFunction : string * string * bool * Type * Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping -> Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression

abstract member NiladicFunction : string * string * bool * Type * Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping -> Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlFunctionExpression
override this.NiladicFunction : string * string * bool * Type * Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping -> Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlFunctionExpression

Public Overridable Function NiladicFunction (schema As String, name As String, nullable As Boolean, returnType As Type, Optional typeMapping As RelationalTypeMapping = Nothing) As SqlExpression

Public Overridable Function NiladicFunction (schema As String, name As String, nullable As Boolean, returnType As Type, Optional typeMapping As RelationalTypeMapping = Nothing) As SqlFunctionExpression

参数

schema: String

在其中定义函数的架构。

name: String

函数的名称。

nullable: Boolean

一个布尔值，该值指示此函数是否可以返回 null。

returnType: Type

Type表达式。

typeMapping: RelationalTypeMapping

与 RelationalTypeMapping 表达式关联的表达式。

SqlExpression

SqlFunctionExpression

表示 SQL 树中的函数调用的表达式。

实现

NiladicFunction(String, String, Boolean, Type, RelationalTypeMapping)

适用于

NiladicFunction(SqlExpression, String, Boolean, Boolean, Type, RelationalTypeMapping)

Source:: SqlExpressionFactory.cs

Source:: SqlExpressionFactory.cs

Source:: SqlExpressionFactory.cs

Source:: SqlExpressionFactory.cs

Source:: SqlExpressionFactory.cs

Source:: SqlExpressionFactory.cs

Source:: SqlExpressionFactory.cs

创建一个新 SqlExpression 值，表示 SQL 树中的 niladic 函数调用。

public virtual Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression NiladicFunction(Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression instance, string name, bool nullable, bool instancePropagatesNullability, Type returnType, Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping? typeMapping = default);

public virtual Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlFunctionExpression NiladicFunction(Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression instance, string name, bool nullable, bool instancePropagatesNullability, Type returnType, Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping typeMapping = default);

public virtual Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlFunctionExpression NiladicFunction(Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression instance, string name, bool nullable, bool instancePropagatesNullability, Type returnType, Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping? typeMapping = default);

abstract member NiladicFunction : Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression * string * bool * bool * Type * Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping -> Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression
override this.NiladicFunction : Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression * string * bool * bool * Type * Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping -> Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression

abstract member NiladicFunction : Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression * string * bool * bool * Type * Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping -> Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlFunctionExpression
override this.NiladicFunction : Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression * string * bool * bool * Type * Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping -> Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlFunctionExpression

Public Overridable Function NiladicFunction (instance As SqlExpression, name As String, nullable As Boolean, instancePropagatesNullability As Boolean, returnType As Type, Optional typeMapping As RelationalTypeMapping = Nothing) As SqlExpression

Public Overridable Function NiladicFunction (instance As SqlExpression, name As String, nullable As Boolean, instancePropagatesNullability As Boolean, returnType As Type, Optional typeMapping As RelationalTypeMapping = Nothing) As SqlFunctionExpression