ISqlExpressionFactory.Coalesce 方法

定义

命名空间:

Microsoft.EntityFrameworkCore.Query

程序集:

Microsoft.EntityFrameworkCore.Relational.dll

包:

Microsoft.EntityFrameworkCore.Relational v8.0.0

创建一个 SqlFunctionExpression 表示 COALESCE 操作的 。

public Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlFunctionExpression Coalesce (Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression left, Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression right, Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping? typeMapping = default);

abstract member Coalesce : Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression * Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression * Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping -> Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlFunctionExpression

Public Function Coalesce (left As SqlExpression, right As SqlExpression, Optional typeMapping As RelationalTypeMapping = Nothing) As SqlFunctionExpression

参数

left

SqlExpression

左操作数。

right

SqlExpression

右操作数。

typeMapping

RelationalTypeMapping

要分配给创建的表达式的类型映射。

返回

SqlFunctionExpression

表示 SQL COALESCE 操作的表达式。