通过

CaseExpression 构造函数

  • 参考

定义

命名空间:
Microsoft.EntityFrameworkCore.Query.SqlExpressions
程序集:
Microsoft.EntityFrameworkCore.Relational.dll
包:
Microsoft.EntityFrameworkCore.Relational v3.0.0
包:
Microsoft.EntityFrameworkCore.Relational v3.1.0
包:
Microsoft.EntityFrameworkCore.Relational v5.0.0
包:
Microsoft.EntityFrameworkCore.Relational v6.0.0
包:
Microsoft.EntityFrameworkCore.Relational v7.0.0
包:
Microsoft.EntityFrameworkCore.Relational v8.0.0

重载

CaseExpression(SqlExpression, IReadOnlyList<CaseWhenClause>)
CaseExpression(IReadOnlyList<CaseWhenClause>, SqlExpression)

创建 表示搜索的 CASE 表达式的 CaseExpression 类的新实例。
CaseExpression(SqlExpression, IReadOnlyList<CaseWhenClause>, SqlExpression)

创建 表示简单 CASE 表达式的 CaseExpression 类的新实例。

CaseExpression(SqlExpression, IReadOnlyList<CaseWhenClause>) 

public CaseExpression (Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression operand, System.Collections.Generic.IReadOnlyList<Microsoft.EntityFrameworkCore.Query.SqlExpressions.CaseWhenClause> whenClauses);
new Microsoft.EntityFrameworkCore.Query.SqlExpressions.CaseExpression : Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression * System.Collections.Generic.IReadOnlyList<Microsoft.EntityFrameworkCore.Query.SqlExpressions.CaseWhenClause> -> Microsoft.EntityFrameworkCore.Query.SqlExpressions.CaseExpression
Public Sub New (operand As SqlExpression, whenClauses As IReadOnlyList(Of CaseWhenClause))

参数

operand
SqlExpression
whenClauses
IReadOnlyList<CaseWhenClause>

适用于

CaseExpression(IReadOnlyList<CaseWhenClause>, SqlExpression)

创建 表示搜索的 CASE 表达式的 CaseExpression 类的新实例。

public CaseExpression (System.Collections.Generic.IReadOnlyList<Microsoft.EntityFrameworkCore.Query.SqlExpressions.CaseWhenClause> whenClauses, Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression elseResult);
public CaseExpression (System.Collections.Generic.IReadOnlyList<Microsoft.EntityFrameworkCore.Query.SqlExpressions.CaseWhenClause> whenClauses, Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression elseResult = default);
public CaseExpression (System.Collections.Generic.IReadOnlyList<Microsoft.EntityFrameworkCore.Query.SqlExpressions.CaseWhenClause> whenClauses, Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression? elseResult = default);
new Microsoft.EntityFrameworkCore.Query.SqlExpressions.CaseExpression : System.Collections.Generic.IReadOnlyList<Microsoft.EntityFrameworkCore.Query.SqlExpressions.CaseWhenClause> * Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression -> Microsoft.EntityFrameworkCore.Query.SqlExpressions.CaseExpression
Public Sub New (whenClauses As IReadOnlyList(Of CaseWhenClause), elseResult As SqlExpression)
Public Sub New (whenClauses As IReadOnlyList(Of CaseWhenClause), Optional elseResult As SqlExpression = Nothing)

参数

whenClauses
IReadOnlyList<CaseWhenClause>

要评估条件并从中获取结果的 的列表 CaseWhenClause 。

elseResult
SqlExpression

如果没有匹配项，则 WhenClauses 返回一个值（如果有）。

适用于

CaseExpression(SqlExpression, IReadOnlyList<CaseWhenClause>, SqlExpression)

创建 表示简单 CASE 表达式的 CaseExpression 类的新实例。

public CaseExpression (Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression operand, System.Collections.Generic.IReadOnlyList<Microsoft.EntityFrameworkCore.Query.SqlExpressions.CaseWhenClause> whenClauses, Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression elseResult);
public CaseExpression (Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression operand, System.Collections.Generic.IReadOnlyList<Microsoft.EntityFrameworkCore.Query.SqlExpressions.CaseWhenClause> whenClauses, Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression elseResult = default);
public CaseExpression (Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression operand, System.Collections.Generic.IReadOnlyList<Microsoft.EntityFrameworkCore.Query.SqlExpressions.CaseWhenClause> whenClauses, Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression? elseResult = default);
new Microsoft.EntityFrameworkCore.Query.SqlExpressions.CaseExpression : Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression * System.Collections.Generic.IReadOnlyList<Microsoft.EntityFrameworkCore.Query.SqlExpressions.CaseWhenClause> * Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression -> Microsoft.EntityFrameworkCore.Query.SqlExpressions.CaseExpression
Public Sub New (operand As SqlExpression, whenClauses As IReadOnlyList(Of CaseWhenClause), elseResult As SqlExpression)
Public Sub New (operand As SqlExpression, whenClauses As IReadOnlyList(Of CaseWhenClause), Optional elseResult As SqlExpression = Nothing)

参数

operand
SqlExpression

要与 Test 在 中进行比较的 WhenClauses表达式。

whenClauses
IReadOnlyList<CaseWhenClause>

要比较和获取结果的列表 CaseWhenClause 。

elseResult
SqlExpression

如果没有匹配项，则 WhenClauses 返回一个值（如果有）。

适用于